Harrismith Weather in December

NASA POWER reanalysis for the half-degree grid cell around Harrismith, 1991-2020; a grid cell is an area average and can differ from a thermometer in town by several degrees

Average highs run from 24°C on December 1 to 25°C on December 31, and lows from 9°C to 11°C. Normal precipitation for the month is 143 mm over about 22 wet days.

December day by day

The normal high and low for each date, in °C.

Normal low
Normal high
Reanalysis extreme high
Reanalysis extreme low

December at a glance

Average high: 24°C
Average low: 10°C
Precipitation: 143 mm
Reanalysis high: 34°CDec 7, 2015
Reanalysis low: 0°CDec 1, 1995
Daylight: 13 h 48 min to 13 h 55 min
Cloud cover: 69%
Humidity: 67%
Dew point: 9°C
Wind: 14.0 km/h

Every day of the month

A wet day has at least 1 mm of precipitation in the reanalysis.

Date	Normal high	Normal low	Reanalysis high	Reanalysis low	Chance wet
Dec 1	24°C	9°C	32°C 2015	0°C 1995	68%
Dec 2	24°C	9°C	31°C 2019	4°C 1995	69%
Dec 3	23°C	10°C	30°C 2019	4°C 1998	71%
Dec 4	23°C	10°C	31°C 2016	2°C 1998	72%
Dec 5	23°C	10°C	31°C 1994	3°C 1991	71%
Dec 6	24°C	10°C	32°C 2015	3°C 1991	71%
Dec 7	24°C	10°C	34°C 2015	7°C 1993	71%
Dec 8	24°C	10°C	28°C 2003	7°C 1995	71%
Dec 9	24°C	10°C	30°C 2015	6°C 2005	72%
Dec 10	24°C	10°C	32°C 2015	5°C 2006	72%
Dec 11	24°C	10°C	33°C 2015	3°C 1994	72%
Dec 12	24°C	10°C	29°C 2018	0°C 1994	72%
Dec 13	24°C	10°C	30°C 2018	5°C 2005	72%
Dec 14	24°C	10°C	30°C 2018	6°C 2017	71%
Dec 15	24°C	10°C	30°C 2018	5°C 2017	72%
Dec 16	24°C	10°C	31°C 2018	5°C 2019	72%
Dec 17	24°C	11°C	32°C 2003	7°C 1997	71%
Dec 18	24°C	11°C	32°C 2015	5°C 1997	70%
Dec 19	24°C	11°C	33°C 2015	5°C 2007	71%
Dec 20	24°C	11°C	30°C 2015	6°C 2007	71%
Dec 21	24°C	11°C	31°C 2015	7°C 2001	73%
Dec 22	24°C	11°C	31°C 2015	9°C 1991	74%
Dec 23	24°C	11°C	31°C 2015	6°C 1995	76%
Dec 24	25°C	11°C	33°C 2015	8°C 2005	78%
Dec 25	24°C	11°C	31°C 2018	5°C 1994	79%
Dec 26	24°C	11°C	33°C 2018	6°C 1992	79%
Dec 27	24°C	11°C	33°C 2018	4°C 2003	80%
Dec 28	24°C	11°C	30°C 2015	7°C 2003	80%
Dec 29	25°C	11°C	29°C 2015	9°C 2005	80%
Dec 30	25°C	11°C	28°C 2020	8°C 2013	79%
Dec 31	25°C	11°C	30°C 2004	8°C 2007	79%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (GMT+2).

December 1: sunrise 4:59 AM, sunset 6:47 PM
December 31: sunrise 5:09 AM, sunset 7:04 PM

Every day of December: sun and moon

Other months

Sources

Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.