Climate averages 1991–2020
Delmas weather
in December.
A warm, wet month: the 4th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a warm month in Delmas: daytime highs average 25.2°C and nights cool to about 14.6°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 138 mm of rain on roughly 17 days, which makes December a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 13 h 44 min on an average December day.
The nearest other city in this atlas is Etwatwa (23 km away). In December its highs average 25.1°C, about as warm as Delmas, with 135 mm of rain.
Among the 95 cities listed in South Africa, Delmas ranks joint 67th of 95 for the warmest December highs and joint 72nd of 95 for the driest December (rainfall, lowest first). The mean December high of those 95 cities is 26.6°C; Delmas is 1.4°C cooler than that mean.
From December to January, average highs rise by 0.1°C to 25.3°C, and monthly rainfall falls from 138 mm to 128 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Delmas climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 25.3°C15.0°C | 15.0°C | 128 | 16.2 | 13.614 h |
| February | 25.3°C14.8°C | 14.8°C | 105 | 13.0 | 13.013 h |
| March | 24.2°C13.3°C | 13.3°C | 89 | 11.2 | 12.312 h |
| April | 21.9°C10.3°C | 10.3°C | 40 | 6.6 | 11.511 h |
| May | 20.0°C6.7°C | 6.7°C | 15 | 2.6 | 10.911 h |
| June | 17.6°C3.7°C | 3.7°C | 6.6 | 1.1 | 10.511 h |
| July | 17.7°C3.1°C | 3.1°C | 4.2 | 0.7 | 10.711 h |
| August | 20.9°C5.8°C | 5.8°C | 11 | 2.1 | 11.211 h |
| September | 24.9°C9.6°C | 9.6°C | 24 | 3.4 | 11.912 h |
| October | 25.5°C11.8°C | 11.8°C | 83 | 10.8 | 12.713 h |
| November | 25.0°C13.2°C | 13.2°C | 104 | 14.0 | 13.413 h |
| December, selected | 25.2°C14.6°C | 14.6°C | 138 | 17.4 | 13.714 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Etwatwa in DecemberSouth Africa · 23 kmHigh 25.1°C · Low 14.7°C · 135 mm rain
- Brakpan in DecemberSouth Africa · 33 kmHigh 25.0°C · Low 14.4°C · 130 mm rain
- Benoni in DecemberSouth Africa · 36 kmHigh 25.0°C · Low 14.5°C · 130 mm rain
- Nigel in DecemberSouth Africa · 38 kmHigh 25.3°C · Low 14.7°C · 147 mm rain
- Thembisa in DecemberSouth Africa · 49 kmHigh 25.5°C · Low 15.0°C · 116 mm rain
- Heidelberg, South Africa in DecemberSouth Africa · 51 kmHigh 25.7°C · Low 15.0°C · 140 mm rain
- Germiston in DecemberSouth Africa · 52 kmHigh 25.1°C · Low 14.6°C · 130 mm rain
- eMbalenhle in DecemberSouth Africa · 58 kmHigh 24.9°C · Low 14.4°C · 151 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Delmas) is explained once on the Delmas year overview and on the Sources, method and limits page.