South Africa

Summary

Warmest month	January	23 °C
Coldest month	July	11.24 °C
Average annual temperature	17.64 °C
Warmest year (1901-2012)	2010	18.84 °C
Coldest year (1901-2012)	1907	16.49 °C
Average annual temperature trend (1901-2012)	+0.0139 °C
Wettest month	January	67.86 mm
Driest month	July	14.67 mm
Average annual precipitation	40.51 mm
Wettest year (1901-2012)	1976	689.8 mm
Driest year (1901-2012)	1992	327.9 mm
Average annual precipitation trend (1901-2012)	+0.1084 mm
Month with highest average daily PEV	December	5.71 mm
Month with lowest average daily PEV	June	2.01 mm
Average daily PEV	3.93 mm
Year with highest average daily PEV (1901-2012)	2007	4.13 mm
Year with lowest average daily PEV (1901-2012)	1907	3.75 mm
Average annual daily PEV trend (1901-2012)	+0.0015 mm
Month with highest cloudiness	February	43.96 %
Month with lowest cloudiness	July	21.83 %
Average annual cloudiness	35.15 %
Year with highest average cloudiness (1901-2012)	1974	40.17 %
Year with lowest average cloudiness (1901-2012)	1941	29.73 %
Average annual cloudiness trend (1901-2012)	-0.0042 %

Summary graph

Summary graph for decades

Summary table of values and deviations for individual years

Year	Average	deviation		Total	deviation		Average	deviation		Average	deviation
	°C	°C	%	mm	mm	%	mm	mm	%	%	%
1901	16.95	-0.69	-3.9	603.8	117.7	24.2	3.83	-0.10	-2.5	35.8	0.6
1902	16.86	-0.78	-4.4	431.7	-54.4	-11.2	3.78	-0.15	-3.8	35.8	0.6
1903	16.80	-0.84	-4.8	358.6	-127.5	-26.2	3.80	-0.13	-3.3	35.7	0.6
1904	16.78	-0.86	-4.9	441.1	-45.0	-9.3	3.78	-0.15	-3.8	35.8	0.6
1905	16.98	-0.66	-3.7	446.2	-39.9	-8.2	3.82	-0.11	-2.8	35.8	0.6
1906	16.66	-0.98	-5.6	497.5	11.4	2.3	3.76	-0.17	-4.3	35.7	0.6
1907	16.49	-1.15	-6.5	562.0	75.9	15.6	3.75	-0.18	-4.6	35.7	0.6
1908	16.78	-0.86	-4.9	407.0	-79.1	-16.3	3.78	-0.14	-3.6	35.8	0.6
1909	16.87	-0.77	-4.4	611.2	125.1	25.7	3.83	-0.10	-2.5	35.7	0.6
1910	16.62	-1.02	-5.8	500.9	14.8	3.0	3.80	-0.13	-3.3	35.7	0.6
1911	16.86	-0.78	-4.4	520.9	34.8	7.2	3.84	-0.09	-2.3	35.7	0.6
1912	17.18	-0.46	-2.6	415.8	-70.3	-14.5	3.87	-0.06	-1.5	35.8	0.6
1913	17.27	-0.37	-2.1	479.8	-6.3	-1.3	3.88	-0.05	-1.3	35.7	0.6
1914	17.32	-0.32	-1.8	502.4	16.3	3.4	3.87	-0.06	-1.5	35.8	0.6
1915	17.12	-0.52	-2.9	468.4	-17.7	-3.6	3.86	-0.07	-1.8	35.7	0.6
1916	17.08	-0.56	-3.2	396.6	-89.5	-18.4	3.87	-0.06	-1.5	35.7	0.6
1917	16.64	-1.00	-5.7	612.5	126.4	26.0	3.81	-0.12	-3.1	35.8	0.6
1918	16.91	-0.73	-4.1	572.0	85.9	17.7	3.85	-0.08	-2.0	35.7	0.6
1919	17.33	-0.31	-1.8	375.2	-110.9	-22.8	3.92	-0.01	-0.3	35.7	0.6
1920	17.23	-0.41	-2.3	525.5	39.4	8.1	3.88	-0.05	-1.3	35.7	0.6
1921	16.70	-0.94	-5.3	584.9	98.8	20.3	3.82	-0.11	-2.8	35.7	0.6
1922	17.36	-0.28	-1.6	411.2	-74.9	-15.4	3.87	-0.06	-1.5	35.7	0.6
1923	17.41	-0.23	-1.3	486.2	0.1	0.0	3.92	-0.01	-0.3	35.7	0.6
1924	16.72	-0.92	-5.2	497.1	11.0	2.3	3.83	-0.09	-2.3	35.7	0.5
1925	17.06	-0.58	-3.3	570.4	84.3	17.3	3.87	-0.06	-1.5	35.7	0.5
1926	17.18	-0.46	-2.6	388.9	-97.2	-20.0	3.88	-0.05	-1.3	35.7	0.6
1927	17.66	0.02	0.1	393.3	-92.8	-19.1	3.97	0.04	1.0	35.7	0.6
1928	17.39	-0.25	-1.4	440.4	-45.7	-9.4	3.88	-0.04	-1.0	35.7	0.6
1929	17.37	-0.27	-1.5	546.3	60.2	12.4	3.88	-0.04	-1.0	35.7	0.6
1930	17.22	-0.42	-2.4	426.2	-59.9	-12.3	3.89	-0.04	-1.0	35.7	0.6
1931	17.62	-0.02	-0.1	459.3	-26.8	-5.5	3.91	-0.02	-0.5	35.7	0.6
1932	17.94	0.30	1.7	435.4	-50.7	-10.4	3.97	0.04	1.0	35.7	0.6
1933	17.81	0.17	1.0	405.2	-80.9	-16.6	3.98	0.06	1.5	35.8	0.6
1934	17.83	0.19	1.1	568.4	82.3	16.9	3.93	-0.00	0.0	35.8	0.6
1935	17.01	-0.63	-3.6	397.6	-88.5	-18.2	3.88	-0.04	-1.0	35.7	0.6
1936	17.33	-0.31	-1.8	515.5	29.4	6.0	3.88	-0.04	-1.0	35.8	0.6
1937	17.65	0.01	0.1	459.3	-26.8	-5.5	3.96	0.03	0.8	35.7	0.6
1938	17.60	-0.04	-0.2	475.7	-10.4	-2.1	3.91	-0.02	-0.5	35.7	0.6
1939	17.37	-0.27	-1.5	578.5	92.4	19.0	3.88	-0.05	-1.3	35.8	0.6
1940	17.70	0.06	0.3	509.2	23.1	4.8	4.01	0.08	2.0	32.7	-2.4
1941	17.99	0.35	2.0	430.6	-55.5	-11.4	4.09	0.16	4.1	29.7	-5.4
1942	17.73	0.09	0.5	554.3	68.2	14.0	3.85	-0.08	-2.0	35.7	0.6
1943	17.00	-0.64	-3.6	602.4	116.3	23.9	3.82	-0.11	-2.8	37.1	1.9
1944	17.74	0.10	0.6	451.6	-34.5	-7.1	4.07	0.14	3.6	30.3	-4.8
1945	18.00	0.36	2.0	365.7	-120.4	-24.8	4.12	0.19	4.8	29.8	-5.4
1946	17.93	0.29	1.6	445.7	-40.4	-8.3	4.07	0.14	3.6	31.3	-3.9
1947	17.98	0.34	1.9	471.4	-14.7	-3.0	4.04	0.11	2.8	33.0	-2.1
1948	17.55	-0.09	-0.5	464.0	-22.1	-4.5	3.98	0.05	1.3	32.1	-3.1
1949	17.97	0.33	1.9	427.0	-59.1	-12.2	4.07	0.14	3.6	31.1	-4.0
1950	17.61	-0.03	-0.2	535.6	49.5	10.2	3.93	0.01	0.3	35.9	0.8
1951	17.22	-0.42	-2.4	407.0	-79.1	-16.3	4.03	0.10	2.5	30.6	-4.6
1952	17.75	0.11	0.6	448.9	-37.2	-7.7	4.03	0.10	2.5	32.4	-2.8
1953	17.44	-0.20	-1.1	515.6	29.5	6.1	3.92	-0.01	-0.3	34.4	-0.7
1954	17.20	-0.44	-2.5	485.6	-0.5	-0.1	3.92	-0.01	-0.3	33.9	-1.3
1955	16.76	-0.88	-5.0	580.6	94.5	19.4	3.78	-0.15	-3.8	36.9	1.7
1956	17.24	-0.40	-2.3	549.7	63.6	13.1	3.90	-0.03	-0.8	36.0	0.8
1957	17.73	0.09	0.5	544.6	58.5	12.0	3.90	-0.03	-0.8	38.1	3.0
1958	17.74	0.10	0.6	497.4	11.3	2.3	3.99	0.06	1.5	34.0	-1.1
1959	17.63	-0.01	-0.1	470.2	-15.9	-3.3	3.98	0.05	1.3	33.4	-1.7
1960	17.77	0.13	0.7	469.6	-16.5	-3.4	3.95	0.02	0.5	34.8	-0.4
1961	17.73	0.09	0.5	533.7	47.6	9.8	3.92	-0.01	-0.3	37.8	2.6
1962	17.93	0.29	1.6	449.5	-36.6	-7.5	4.04	0.11	2.8	32.3	-2.8
1963	17.73	0.09	0.5	535.1	49.0	10.1	3.88	-0.04	-1.0	37.4	2.2
1964	17.51	-0.13	-0.7	443.9	-42.2	-8.7	3.95	0.02	0.5	34.3	-0.8
1965	17.61	-0.03	-0.2	374.7	-111.4	-22.9	3.99	0.06	1.5	33.8	-1.4
1966	18.00	0.36	2.0	394.3	-91.8	-18.9	3.97	0.04	1.0	35.2	0.0
1967	17.48	-0.16	-0.9	557.0	70.9	14.6	3.87	-0.06	-1.5	38.2	3.0
1968	17.24	-0.40	-2.3	403.2	-82.9	-17.1	3.88	-0.04	-1.0	36.1	0.9
1969	17.93	0.29	1.6	455.0	-31.1	-6.4	3.93	0.01	0.3	36.3	1.1
1970	17.90	0.26	1.5	404.8	-81.3	-16.7	3.98	0.06	1.5	34.2	-0.9
1971	17.53	-0.11	-0.6	515.8	29.7	6.1	3.85	-0.08	-2.0	36.9	1.7
1972	17.86	0.22	1.2	472.5	-13.6	-2.8	3.97	0.04	1.0	33.5	-1.6
1973	17.85	0.21	1.2	494.5	8.4	1.7	3.89	-0.04	-1.0	36.6	1.5
1974	17.34	-0.30	-1.7	658.7	172.6	35.5	3.77	-0.16	-4.1	40.2	5.0
1975	17.34	-0.30	-1.7	584.0	97.9	20.1	3.85	-0.08	-2.0	36.5	1.3
1976	17.15	-0.49	-2.8	689.8	203.7	41.9	3.76	-0.17	-4.3	39.0	3.9
1977	17.86	0.22	1.2	575.6	89.5	18.4	3.89	-0.04	-1.0	36.0	0.8
1978	17.61	-0.03	-0.2	517.1	31.0	6.4	3.94	0.01	0.3	33.2	-2.0
1979	18.03	0.39	2.2	437.4	-48.7	-10.0	3.98	0.05	1.3	35.7	0.6
1980	17.84	0.20	1.1	454.6	-31.5	-6.5	3.99	0.06	1.5	32.5	-2.7
1981	17.37	-0.27	-1.5	552.6	66.5	13.7	3.86	-0.07	-1.8	36.0	0.8
1982	17.98	0.34	1.9	400.9	-85.2	-17.5	4.00	0.07	1.8	36.4	1.3
1983	18.47	0.83	4.7	440.0	-46.1	-9.5	4.03	0.10	2.5	35.2	0.1
1984	18.28	0.64	3.6	429.2	-56.9	-11.7	4.03	0.10	2.5	34.6	-0.5
1985	18.37	0.73	4.1	524.5	38.4	7.9	3.96	0.03	0.8	35.1	-0.1
1986	18.33	0.69	3.9	448.6	-37.5	-7.7	3.98	0.06	1.5	35.8	0.6
1987	18.43	0.79	4.5	487.0	0.9	0.2	3.98	0.06	1.5	36.2	1.0
1988	17.93	0.29	1.6	598.3	112.2	23.1	3.87	-0.06	-1.5	37.8	2.7
1989	17.73	0.09	0.5	527.2	41.1	8.5	3.92	-0.01	-0.3	36.1	0.9
1990	18.00	0.36	2.0	403.3	-82.8	-17.0	4.01	0.08	2.0	34.4	-0.7
1991	18.01	0.37	2.1	514.7	28.6	5.9	3.90	-0.03	-0.8	36.0	0.8
1992	18.48	0.84	4.8	327.9	-158.2	-32.5	4.12	0.19	4.8	31.6	-3.5
1993	18.52	0.88	5.0	454.7	-31.4	-6.5	3.95	0.02	0.5	36.1	0.9
1994	17.90	0.26	1.5	398.0	-88.1	-18.1	4.03	0.11	2.8	32.6	-2.6
1995	18.11	0.47	2.7	517.2	31.1	6.4	3.90	-0.03	-0.8	36.4	1.2
1996	17.56	-0.08	-0.5	589.7	103.6	21.3	3.80	-0.13	-3.3	38.0	2.9
1997	17.89	0.25	1.4	510.2	24.1	5.0	3.88	-0.04	-1.0	37.7	2.5
1998	18.33	0.69	3.9	503.7	17.6	3.6	3.95	0.02	0.5	35.5	0.4
1999	18.73	1.09	6.2	452.3	-33.8	-7.0	4.03	0.10	2.5	35.0	-0.1
2000	17.78	0.14	0.8	616.9	130.8	26.9	3.86	-0.07	-1.8	36.8	1.7
2001	18.04	0.40	2.3	574.4	88.3	18.2	3.88	-0.04	-1.0	37.5	2.3
2002	18.09	0.45	2.6	437.4	-48.7	-10.0	4.01	0.08	2.0	35.9	0.8
2003	18.43	0.79	4.5	383.3	-102.8	-21.1	4.10	0.17	4.3	32.0	-3.2
2004	18.60	0.96	5.4	485.9	-0.2	-0.0	4.07	0.14	3.6	33.0	-2.1
2005	18.69	1.05	6.0	410.5	-75.6	-15.6	4.10	0.17	4.3	32.5	-2.6
2006	18.32	0.68	3.9	590.9	104.8	21.6	3.96	0.03	0.8	36.3	1.1
2007	18.53	0.89	5.0	440.5	-45.6	-9.4	4.13	0.21	5.3	31.3	-3.9
2008	18.60	0.96	5.4	440.9	-45.2	-9.3	4.05	0.12	3.1	34.1	-1.0
2009	18.58	0.94	5.3	486.4	0.3	0.1	4.02	0.09	2.3	34.9	-0.3
2010	18.84	1.20	6.8	489.7	3.6	0.7	4.05	0.12	3.1	34.8	-0.3
2011	18.33	0.69	3.9	570.7	84.6	17.4	4.02	0.09	2.3	35.2	0.0
2012	18.35	0.71	4.0	487.3	1.2	0.2	4.07	0.14	3.6	33.5	-1.6

Summary deviations table by decades

Year	Average	deviation		Total	deviation		Average	deviation		Average	deviation
	°C	°C	%	mm	mm	%	mm	mm	%	%	%
1901-1910	16.78	-0.86	-4.9	486.0	-0.1	-0.0	3.79	-0.14	-3.6	35.74	0.59
1911-1920	17.09	-0.55	-3.1	486.9	0.8	0.2	3.86	-0.07	-1.8	35.74	0.59
1921-1930	17.21	-0.43	-2.4	474.5	-11.6	-2.4	3.88	-0.05	-1.3	35.72	0.57
1931-1940	17.59	-0.05	-0.3	480.4	-5.7	-1.2	3.93	0.00	0.0	35.44	0.29
1941-1950	17.75	0.11	0.6	474.8	-11.3	-2.3	4.00	0.07	1.8	32.61	-2.54
1951-1960	17.45	-0.19	-1.1	496.9	10.8	2.2	3.94	0.01	0.3	34.44	-0.71
1961-1970	17.71	0.07	0.4	455.1	-31.0	-6.4	3.94	0.01	0.3	35.55	0.40
1971-1980	17.64	0.00	0.0	540.0	53.9	11.1	3.89	-0.04	-1.0	36.00	0.85
1981-1990	18.09	0.45	2.6	481.2	-4.9	-1.0	3.96	0.03	0.8	35.76	0.61
1991-2000	18.13	0.49	2.8	488.5	2.4	0.5	3.94	0.01	0.3	35.57	0.42
2001-2010	18.47	0.83	4.7	474.0	-12.1	-2.5	4.04	0.11	2.8	34.22	-0.93

Graph of deviations by decades

Graph of temperatures for individual years and months

Long-term temperature heatmap

Warmest and coldest months

Graph of average monthly temperature ranges

Graph of annual temperature deviations

Table of average monthly temperatures for individual decades

Month	Average	1901-1910		1911-1920		1921-1930		1931-1940		1941-1950
1	23.00	22.11	-0.89	22.70	-0.30	22.65	-0.35	22.63	-0.37	23.13	0.13
2	22.74	21.85	-0.89	22.50	-0.24	22.37	-0.37	22.54	-0.20	23.02	0.28
3	21.05	20.10	-0.95	20.42	-0.63	20.61	-0.44	20.97	-0.08	21.10	0.05
4	17.93	17.10	-0.83	17.46	-0.47	17.52	-0.41	18.06	0.13	18.17	0.24
5	14.38	13.65	-0.73	13.53	-0.85	13.72	-0.65	14.66	0.29	14.35	-0.03
6	11.45	10.74	-0.71	10.72	-0.73	10.95	-0.50	11.77	0.32	11.57	0.12
7	11.24	10.73	-0.51	10.61	-0.63	10.67	-0.57	11.18	-0.06	11.31	0.07
8	13.08	12.26	-0.82	12.23	-0.85	12.41	-0.67	13.19	0.11	13.42	0.34
9	15.89	15.01	-0.88	15.07	-0.82	15.35	-0.54	15.47	-0.42	15.91	0.02
10	18.43	17.20	-1.23	18.05	-0.38	18.21	-0.22	18.45	0.02	18.51	0.08
11	20.39	19.26	-1.13	19.92	-0.47	20.11	-0.28	20.14	-0.25	20.49	0.10
12	22.10	21.33	-0.77	21.89	-0.21	21.90	-0.20	21.97	-0.13	22.01	-0.09

Month	Average	1951-1960		1961-1970		1971-1980		1981-1990		1991-2000		2001-2010
1	23.00	22.81	-0.19	23.34	0.34	22.82	-0.18	23.65	0.65	23.42	0.42	23.49	0.49
2	22.74	22.43	-0.31	22.70	-0.04	22.51	-0.23	23.05	0.31	23.29	0.55	23.70	0.96
3	21.05	20.86	-0.19	21.28	0.23	21.06	0.01	21.45	0.40	21.60	0.55	21.80	0.75
4	17.93	17.63	-0.30	17.49	-0.44	18.07	0.14	18.41	0.48	18.37	0.44	18.91	0.98
5	14.38	14.10	-0.28	14.30	-0.07	14.21	-0.16	15.20	0.82	14.80	0.43	15.29	0.91
6	11.45	11.24	-0.21	11.18	-0.27	11.73	0.28	11.76	0.31	11.91	0.46	12.31	0.86
7	11.24	11.10	-0.14	11.25	0.01	11.47	0.23	11.62	0.38	11.66	0.42	12.00	0.76
8	13.08	12.88	-0.20	13.22	0.14	12.93	-0.15	13.72	0.64	13.60	0.52	13.89	0.81
9	15.89	15.63	-0.26	16.39	0.50	15.96	0.07	16.40	0.51	16.74	0.85	16.72	0.83
10	18.43	18.30	-0.13	18.45	0.02	18.42	-0.01	18.57	0.14	19.01	0.58	19.52	1.09
11	20.39	20.50	0.11	20.57	0.18	20.40	0.01	20.83	0.44	20.71	0.32	21.26	0.87
12	22.10	21.88	-0.22	22.31	0.21	22.10	0.00	22.38	0.28	22.45	0.35	22.77	0.67

Graph of average temperatures for individual months and decades

Graph of average temperature deviations for individual months and decades

Graph of average temperature ranges in individual decades

Graph of precipitation for individual years and months

Long-term precipitation heatmap

Wettest and driest months

Graph of annual precipitation deviations

Table of average monthly precipitation for individual decades

Month	Average	1901-1910		1911-1920		1921-1930		1931-1940		1941-1950
1	67.86	67.31	-0.55	69.04	1.18	62.39	-5.47	66.09	-1.77	64.36	-3.50
2	66.02	71.23	5.21	71.50	5.48	58.78	-7.24	69.45	3.43	59.68	-6.34
3	63.28	61.73	-1.55	68.27	4.99	80.08	16.80	59.66	-3.62	68.85	5.57
4	36.07	35.51	-0.56	31.44	-4.63	28.23	-7.84	31.34	-4.73	42.20	6.13
5	21.72	21.27	-0.45	22.04	0.32	19.43	-2.29	23.11	1.39	23.88	2.16
6	16.27	14.40	-1.87	17.36	1.09	18.09	1.82	13.78	-2.49	14.39	-1.88
7	14.67	9.75	-4.92	17.92	3.25	13.63	-1.04	18.13	3.46	13.37	-1.30
8	17.37	14.33	-3.04	19.39	2.02	16.61	-0.76	14.13	-3.24	15.69	-1.68
9	24.48	31.48	7.00	22.36	-2.12	27.37	2.89	23.77	-0.71	22.15	-2.33
10	41.28	45.71	4.43	40.42	-0.86	35.26	-6.02	34.18	-7.10	40.89	-0.39
11	55.05	52.11	-2.94	49.82	-5.23	54.61	-0.44	62.47	7.42	51.12	-3.93
12	62.01	61.17	-0.84	57.35	-4.66	60.01	-2.00	64.30	2.29	58.25	-3.76

Month	Average	1951-1960		1961-1970		1971-1980		1981-1990		1991-2000		2001-2010
1	67.86	62.73	-5.13	60.98	-6.88	85.61	17.75	59.61	-8.25	74.54	6.68	71.81	3.95
2	66.02	70.64	4.62	51.32	-14.70	80.15	14.13	65.90	-0.12	63.21	-2.81	63.07	-2.95
3	63.28	57.73	-5.55	58.04	-5.24	70.58	7.30	55.12	-8.16	63.96	0.68	51.76	-11.52
4	36.07	37.79	1.72	45.63	9.56	40.38	4.31	38.95	2.88	28.02	-8.05	35.98	-0.09
5	21.72	27.03	5.31	21.58	-0.14	23.94	2.22	16.18	-5.54	19.31	-2.41	20.71	-1.01
6	16.27	14.32	-1.95	21.67	5.40	12.74	-3.53	18.43	2.16	14.22	-2.05	16.28	0.01
7	14.67	15.95	1.28	13.90	-0.77	14.95	0.28	15.43	0.76	14.53	-0.14	12.75	-1.92
8	17.37	18.17	0.80	18.03	0.66	22.88	5.51	19.39	2.02	14.40	-2.97	18.40	1.03
9	24.48	26.72	2.24	17.86	-6.62	28.99	4.51	27.40	2.92	20.52	-3.96	22.07	-2.41
10	41.28	41.63	0.35	42.33	1.05	37.77	-3.51	50.49	9.21	46.20	4.92	37.63	-3.65
11	55.05	54.80	-0.25	53.33	-1.72	58.74	3.69	54.87	-0.18	58.43	3.38	57.83	2.78
12	62.01	69.41	7.40	50.45	-11.56	63.27	1.26	59.39	-2.62	71.19	9.18	65.70	3.69

Graph of average precipitation for individual months and decades

Graph of average precipitation deviations for individual months and decades

Graph of cloudiness for individual years and months

Long-term cloudiness heatmap

Least and most cloudy months

Graph of annual cloudiness deviations

Table of average monthly cloudiness for individual decades

Month	Average	1901-1910		1911-1920		1921-1930		1931-1940		1941-1950
1	42.89	43.10	0.21	43.10	0.21	43.10	0.21	42.66	-0.23	41.17	-1.72
2	43.96	44.20	0.24	44.20	0.24	44.20	0.24	43.89	-0.07	41.89	-2.07
3	41.32	42.00	0.68	42.00	0.68	42.00	0.68	42.11	0.79	41.87	0.55
4	37.13	37.80	0.67	37.80	0.67	37.79	0.66	37.41	0.28	36.00	-1.13
5	28.33	28.44	0.11	28.44	0.11	28.43	0.10	28.11	-0.22	27.12	-1.21
6	24.07	24.69	0.62	24.67	0.60	24.67	0.60	23.95	-0.12	18.26	-5.81
7	21.83	22.40	0.57	22.40	0.57	22.39	0.56	21.36	-0.47	18.94	-2.89
8	24.88	25.70	0.82	25.70	0.82	25.67	0.79	24.94	0.06	20.56	-4.32
9	32.26	33.50	1.24	33.50	1.24	33.41	1.15	34.59	2.33	29.43	-2.83
10	41.06	41.80	0.74	41.80	0.74	41.76	0.70	41.34	0.28	38.42	-2.64
11	42.80	43.50	0.70	43.50	0.70	43.45	0.65	43.52	0.72	39.14	-3.66
12	41.25	41.80	0.55	41.80	0.55	41.73	0.48	41.44	0.19	38.47	-2.78

Month	Average	1951-1960		1961-1970		1971-1980		1981-1990		1991-2000		2001-2010
1	42.89	42.16	-0.73	42.25	-0.64	45.06	2.17	41.95	-0.94	42.35	-0.54	44.32	1.43
2	43.96	43.93	-0.03	40.99	-2.97	47.42	3.46	44.15	0.19	43.36	-0.60	44.72	0.76
3	41.32	40.15	-1.17	40.45	-0.87	44.29	2.97	41.33	0.01	40.65	-0.67	37.92	-3.40
4	37.13	34.61	-2.52	38.46	1.33	37.42	0.29	37.51	0.38	37.42	0.29	36.71	-0.42
5	28.33	30.85	2.52	29.50	1.17	28.42	0.09	28.28	-0.05	27.10	-1.23	27.14	-1.19
6	24.07	21.86	-2.21	28.71	4.64	21.57	-2.50	24.16	0.09	24.75	0.68	26.62	2.55
7	21.83	23.20	1.37	23.09	1.26	21.13	-0.70	23.09	1.26	22.70	0.87	19.21	-2.62
8	24.88	23.30	-1.58	25.54	0.66	26.36	1.48	25.09	0.21	26.70	1.82	24.52	-0.36
9	32.26	29.35	-2.91	31.05	-1.21	34.78	2.52	34.59	2.33	33.34	1.08	28.88	-3.38
10	41.06	38.26	-2.80	41.76	0.70	40.08	-0.98	43.50	2.44	43.59	2.53	39.99	-1.07
11	42.80	42.88	0.08	43.95	1.15	43.16	0.36	43.34	0.54	43.43	0.63	42.09	-0.71
12	41.25	42.72	1.47	40.80	-0.45	42.36	1.11	42.13	0.88	41.41	0.16	38.55	-2.70

Graph of average cloudiness for individual months and decades

Graph of average cloudiness deviations for individual months and decades

Graph of PEV for individual years and months

Long-term daily evapotranspiration heatmap

Graph of annual PEV deviations

Table of average monthly daily potential evapotranspiration for individual decades

Month	Average	1901-1910		1911-1920		1921-1930		1931-1940		1941-1950
1	5.61	5.43	-0.18	5.55	-0.06	5.56	-0.05	5.60	-0.01	5.72	0.11
2	4.96	4.82	-0.14	4.94	-0.02	4.91	-0.05	4.94	-0.02	5.09	0.13
3	4.08	3.93	-0.15	4.01	-0.07	4.02	-0.06	4.08	-0.00	4.10	0.02
4	3.10	2.97	-0.13	3.05	-0.05	3.06	-0.04	3.11	0.01	3.14	0.04
5	2.42	2.35	-0.07	2.34	-0.08	2.39	-0.03	2.45	0.03	2.43	0.01
6	2.01	1.94	-0.07	1.95	-0.06	1.97	-0.04	2.04	0.03	2.09	0.08
7	2.25	2.18	-0.07	2.20	-0.05	2.21	-0.04	2.25	0.00	2.28	0.03
8	3.01	2.90	-0.11	2.93	-0.08	2.96	-0.05	3.05	0.04	3.11	0.10
9	3.96	3.82	-0.14	3.83	-0.13	3.87	-0.09	3.88	-0.08	4.04	0.08
10	4.72	4.51	-0.21	4.65	-0.07	4.69	-0.03	4.77	0.05	4.79	0.07
11	5.29	5.09	-0.20	5.20	-0.09	5.24	-0.05	5.26	-0.03	5.42	0.13
12	5.71	5.55	-0.16	5.70	-0.01	5.68	-0.03	5.73	0.02	5.82	0.11

Month	Average	1951-1960		1961-1970		1971-1980		1981-1990		1991-2000		2001-2010
1	5.61	5.63	0.02	5.71	0.10	5.46	-0.15	5.76	0.15	5.64	0.03	5.63	0.02
2	4.96	4.91	-0.05	5.09	0.13	4.79	-0.17	5.00	0.04	5.03	0.07	5.08	0.12
3	4.08	4.10	0.02	4.14	0.06	3.97	-0.11	4.13	0.05	4.09	0.01	4.28	0.20
4	3.10	3.15	0.05	3.03	-0.07	3.10	0.00	3.14	0.04	3.14	0.04	3.18	0.08
5	2.42	2.37	-0.05	2.42	0.00	2.42	0.00	2.49	0.07	2.43	0.01	2.50	0.08
6	2.01	2.06	0.05	1.92	-0.09	2.04	0.03	2.04	0.03	2.05	0.04	2.06	0.05
7	2.25	2.24	-0.01	2.24	-0.01	2.30	0.05	2.27	0.02	2.23	-0.02	2.32	0.07
8	3.01	3.04	0.03	2.98	-0.03	2.98	-0.03	3.08	0.07	3.03	0.02	3.08	0.07
9	3.96	4.00	0.04	4.06	0.10	3.91	-0.05	3.94	-0.02	4.01	0.05	4.11	0.15
10	4.72	4.79	0.07	4.67	-0.05	4.75	0.03	4.65	-0.07	4.69	-0.03	4.91	0.19
11	5.29	5.36	0.07	5.26	-0.03	5.28	-0.01	5.35	0.06	5.26	-0.03	5.43	0.14
12	5.71	5.60	-0.11	5.78	0.07	5.66	-0.05	5.70	-0.01	5.70	-0.01	5.86	0.15

Graph of average potential evapotranspiration for individual months and decades

Graph of average potential evapotranspiration deviations for individual months and decades

This wiki might help to use the full potential of Groenkloof weather website. The info section explains the hard and software and connections used.(In the menu bar under the sub menus Weather station and Groenkloof Weather) Weather data updates every minute.(for both the mobile and desktop sites) There is a mobile page with current conditions, forecast, forecast map, station history (with drop down menu for today, yesterday, month, year etc. showing all parameters) and lastly a graph with drop down menu for time period and parameter. (Very useful for quick references ) One can switch to the desktop page using the link in bottom right hand corner and vice versa. The desktop version is where very detailed weather info is available. ( Useful for more in depth detail ) It is divided in “blocks” The sunrise/sunset times and day length is shown. Moon with dates of full moon, new moon etc. The current block shows weather values in easy to read numerical format and updates every minute. “Live gauges” updates every minute and when the curser is hovered over a parameter it will show the min and max values and the time when this occurred. In the forecast maps one can use the menu bar top left of block to choose from windy or dark sky maps. Within the map one can choose from different parameters like wind, temperature, rain, thunder, clouds, pressure etc. Then station data is shown with now, max, min values and drop down menu for different time periods. There is also a history block where one can choose different parameters and a trends block with 1,3,6,12,24 hrs etc trends. Next is a forecast meteogram which is dynamic and moving the cursor over it will show all weather parameters at that point. Then easy to read forecast with dropdown the default using the Norwegian institute of meteorology values.(seems to be most accurate) Next is rainfall for today, this month, this year (from January) Drop down gives more options like seasonal(from September) etc. Rain balance is the stations values measured against 100 year rain data for Pretoria obtained from SA weather services. Next is graph with several drop down options and a day pie graph where one can pick dates and parameters. In extremes one can pick a parameter like absolute temperature, precipitation etc. to see max/min value dates and times. There is a air quality block click within block for more info. Map to show location of station. Webcam with view from Herbert Baker Street updates every 5 minutes. For aviation enthusiasts Cloud height time to sunset and density altitude. Then SA weather warnings from SA weather services, lightning detection and fire danger index. Followed by calendar, earthquakes and astronomical events. World weather...shows current conditions in few world cities. Database: data is stored every 5 mins and available data runs from January 2014. The menu at the top is really self explanotory and here there are countless information, statistics etc. Enjoy!! Leon :leonrossouw@me.com