Climate averages 1991–2020
Ar Rass weather
in December.
A mild, very dry month: the 11th warmest and the 8th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
December is a mild month in Ar Rass: daytime highs average 20.7°C and nights cool to about 8.0°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 12 mm of rain on roughly 2 days, which makes December a very dry month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 33 min on an average December day.
The nearest other city in this atlas is Unaizah (56 km away). In December its highs average 20.1°C, 0.6°C cooler than Ar Rass, with 14 mm of rain.
Among the 35 cities listed in Saudi Arabia, Ar Rass ranks 22nd of 35 for the warmest December highs and joint 17th of 35 for the driest December (rainfall, lowest first). The mean December high of those 35 cities is 22.3°C; Ar Rass is 1.6°C cooler than that mean.
From December to January, average highs fall by 1.4°C to 19.3°C, and monthly rainfall rises from 12 mm to 13 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
Ar Rass climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 19.3°C6.3°C | 6.3°C | 13 | 2.4 | 10.711 h |
| February | 22.6°C8.1°C | 8.1°C | 5.9 | 1.1 | 11.311 h |
| March | 26.8°C12.2°C | 12.2°C | 14 | 2.2 | 12.012 h |
| April | 32.3°C17.3°C | 17.3°C | 13 | 2.7 | 12.813 h |
| May | 37.7°C22.1°C | 22.1°C | 1.7 | 0.4 | 13.413 h |
| June | 40.8°C24.1°C | 24.1°C | 0 | 0.0 | 13.714 h |
| July | 41.7°C25.0°C | 25.0°C | 0 | 0.0 | 13.614 h |
| August | 42.1°C25.5°C | 25.5°C | 0 | 0.0 | 13.013 h |
| September | 39.4°C23.0°C | 23.0°C | 0.1 | 0.1 | 12.312 h |
| October | 33.9°C18.4°C | 18.4°C | 2.7 | 0.4 | 11.612 h |
| November | 25.8°C12.8°C | 12.8°C | 20 | 3.0 | 10.911 h |
| December, selected | 20.7°C8.0°C | 8.0°C | 12 | 2.3 | 10.611 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
- Unaizah in DecemberSaudi Arabia · 56 kmHigh 20.1°C · Low 8.1°C · 14 mm rain
- Buraydah in DecemberSaudi Arabia · 70 kmHigh 20.4°C · Low 8.1°C · 15 mm rain
- Az Zulfī in DecemberSaudi Arabia · 140 kmHigh 20.0°C · Low 8.6°C · 15 mm rain
- Ad Dawādimī in DecemberSaudi Arabia · 176 kmHigh 20.9°C · Low 9.2°C · 9.4 mm rain
- Ha'il in DecemberSaudi Arabia · 257 kmHigh 18.3°C · Low 6.3°C · 9.1 mm rain
- Riyadh in DecemberSaudi Arabia · 350 kmHigh 21.3°C · Low 8.9°C · 9.1 mm rain
- Hafar Al-Batin in DecemberSaudi Arabia · 376 kmHigh 18.8°C · Low 7.5°C · 21 mm rain
- Madinah in DecemberSaudi Arabia · 421 kmHigh 25.3°C · Low 11.0°C · 6.9 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 Ar Rass) is explained once on the Ar Rass year overview and on the Sources, method and limits page.