Climate averages 1991–2020
Swindon weather
in December.
A cold, moderately wet month: the 11th warmest and the joint 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cold month in Swindon: daytime highs average 7.1°C and nights cool to about 2.4°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 65 mm of rain on roughly 11 days, which makes December a moderately wet month (the joint 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 7 h 55 min on an average December day.
The nearest other city in this atlas is Oxford (42 km away). In December its highs average 7.2°C, about as warm as Swindon, with 57 mm of rain.
Among the 143 cities listed in the United Kingdom, Swindon ranks joint 72nd of 143 for the warmest December highs and joint 75th of 143 for the driest December (rainfall, lowest first). The mean December high of those 143 cities is 7.2°C; Swindon is 0.1°C cooler than that mean.
From December to January, average highs fall by 0.3°C to 6.8°C, and monthly rainfall falls from 65 mm to 62 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
Swindon climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.8°C1.9°C | 1.9°C | 62 | 11.5 | 8.48 h |
| February | 7.4°C1.7°C | 1.7°C | 48 | 9.9 | 9.910 h |
| March | 9.7°C2.8°C | 2.8°C | 50 | 10.3 | 11.812 h |
| April | 12.6°C4.5°C | 4.5°C | 57 | 11.4 | 13.814 h |
| May | 15.7°C7.5°C | 7.5°C | 61 | 11.2 | 15.616 h |
| June | 18.5°C10.5°C | 10.5°C | 56 | 10.4 | 16.617 h |
| July | 20.6°C12.5°C | 12.5°C | 59 | 10.9 | 16.116 h |
| August | 20.2°C12.5°C | 12.5°C | 65 | 10.8 | 14.615 h |
| September | 17.6°C10.4°C | 10.4°C | 54 | 9.3 | 12.713 h |
| October | 13.7°C7.7°C | 7.7°C | 69 | 11.3 | 10.711 h |
| November | 9.7°C4.5°C | 4.5°C | 68 | 12.0 | 8.99 h |
| December, selected | 7.1°C2.4°C | 2.4°C | 65 | 11.4 | 7.98 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
- Oxford in DecemberUnited Kingdom · 42 kmHigh 7.2°C · Low 2.6°C · 57 mm rain
- Cheltenham in DecemberUnited Kingdom · 43 kmHigh 7.5°C · Low 2.7°C · 62 mm rain
- Bath in DecemberUnited Kingdom · 45 kmHigh 7.5°C · Low 2.8°C · 72 mm rain
- Gloucester, United Kingdom in DecemberUnited Kingdom · 47 kmHigh 7.6°C · Low 2.8°C · 66 mm rain
- Reading in DecemberUnited Kingdom · 57 kmHigh 7.5°C · Low 2.9°C · 59 mm rain
- Bristol in DecemberUnited Kingdom · 58 kmHigh 7.8°C · Low 3.2°C · 73 mm rain
- Basingstoke in DecemberUnited Kingdom · 58 kmHigh 7.4°C · Low 2.7°C · 64 mm rain
- High Wycombe in DecemberUnited Kingdom · 72 kmHigh 7.4°C · Low 2.7°C · 58 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 Swindon) is explained once on the Swindon year overview and on the Sources, method and limits page.