Climate averages 1991–2020
Calais weather
in December.
A cold, wet month: the 10th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cold month in Calais: daytime highs average 7.8°C and nights cool to about 4.3°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 94 mm of rain on roughly 15 days, which makes December a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 8 h 01 min on an average December day.
The nearest other city in this atlas is Dunkirk (38 km away). In December its highs average 7.4°C, about as warm as Calais, with 68 mm of rain.
Among the 57 cities listed in France, Calais ranks 26th of 57 for the warmest December highs and 51st of 57 for the driest December (rainfall, lowest first). The mean December high of those 57 cities is 8.5°C; Calais is 0.7°C cooler than that mean.
From December to January, average highs fall by 0.6°C to 7.2°C, and monthly rainfall falls from 94 mm to 79 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
Calais climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.2°C3.4°C | 3.4°C | 79 | 14.3 | 8.58 h |
| February | 7.6°C3.3°C | 3.3°C | 60 | 11.5 | 10.010 h |
| March | 9.9°C4.7°C | 4.7°C | 51 | 10.5 | 11.812 h |
| April | 12.7°C6.6°C | 6.6°C | 45 | 9.3 | 13.814 h |
| May | 15.6°C9.6°C | 9.6°C | 51 | 9.8 | 15.516 h |
| June | 18.3°C12.4°C | 12.4°C | 49 | 8.7 | 16.416 h |
| July | 20.5°C14.8°C | 14.8°C | 51 | 9.6 | 16.016 h |
| August | 20.8°C15.2°C | 15.2°C | 65 | 10.0 | 14.615 h |
| September | 18.4°C13.2°C | 13.2°C | 68 | 11.2 | 12.713 h |
| October | 14.9°C10.3°C | 10.3°C | 96 | 14.3 | 10.811 h |
| November | 10.7°C6.9°C | 6.9°C | 101 | 16.4 | 9.09 h |
| December, selected | 7.8°C4.3°C | 4.3°C | 94 | 15.0 | 8.08 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
- Dunkirk in DecemberFrance · 38 kmHigh 7.4°C · Low 3.4°C · 68 mm rain
- Saint Peters in DecemberUnited Kingdom · 55 kmHigh 7.8°C · Low 4.6°C · 84 mm rain
- Hastings, United Kingdom in DecemberUnited Kingdom · 90 kmHigh 8.4°C · Low 4.7°C · 107 mm rain
- Lille in DecemberFrance · 91 kmHigh 7.0°C · Low 2.4°C · 70 mm rain
- Roubaix in DecemberFrance · 97 kmHigh 6.9°C · Low 2.4°C · 74 mm rain
- Brugge in DecemberBelgium · 100 kmHigh 7.0°C · Low 3.4°C · 73 mm rain
- Kortrijk in DecemberBelgium · 100 kmHigh 6.9°C · Low 2.6°C · 74 mm rain
- Maidstone in DecemberUnited Kingdom · 100 kmHigh 7.9°C · Low 3.5°C · 62 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 Calais) is explained once on the Calais year overview and on the Sources, method and limits page.