Climate averages 1991–2020
Chālūs weather
in December.
A cool, 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 cool month in Chālūs: daytime highs average 12.6°C and nights cool to about 9.2°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 156 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 9 h 42 min on an average December day.
The nearest other city in this atlas is Āmol (86 km away). In December its highs average 12.2°C, about as warm as Chālūs, with 133 mm of rain.
Among the 128 cities listed in Iran, Chālūs ranks joint 40th of 128 for the warmest December highs and 128th of 128 for the driest December (rainfall, lowest first). The mean December high of those 128 cities is 10.9°C; Chālūs is 1.7°C warmer than that mean.
From December to January, average highs fall by 2.0°C to 10.6°C, and monthly rainfall falls from 156 mm to 142 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
Chālūs climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 10.6°C7.1°C | 7.1°C | 142 | 15.3 | 10.010 h |
| February | 10.4°C6.5°C | 6.5°C | 125 | 14.4 | 10.811 h |
| March | 12.8°C8.3°C | 8.3°C | 100 | 14.1 | 11.912 h |
| April | 16.6°C11.8°C | 11.8°C | 68 | 11.4 | 13.113 h |
| May | 20.9°C16.7°C | 16.7°C | 48 | 10.0 | 14.114 h |
| June | 24.3°C20.8°C | 20.8°C | 49 | 8.9 | 14.615 h |
| July | 26.2°C23.0°C | 23.0°C | 59 | 10.8 | 14.414 h |
| August | 26.9°C23.7°C | 23.7°C | 60 | 11.3 | 13.614 h |
| September | 24.2°C21.1°C | 21.1°C | 148 | 14.6 | 12.412 h |
| October | 21.0°C17.6°C | 17.6°C | 205 | 15.4 | 11.311 h |
| November | 16.0°C12.7°C | 12.7°C | 218 | 15.8 | 10.310 h |
| December, selected | 12.6°C9.2°C | 9.2°C | 156 | 14.6 | 9.710 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
- Āmol in DecemberIran · 86 kmHigh 12.2°C · Low 3.8°C · 133 mm rain
- Tajrīsh in DecemberIran · 95 kmHigh 5.0°C · Low -4.6°C · 43 mm rain
- Mehestan in DecemberIran · 96 kmHigh 5.8°C · Low -3.4°C · 34 mm rain
- Karaj in DecemberIran · 99 kmHigh 7.5°C · Low -3.3°C · 37 mm rain
- Kamālshahr in DecemberIran · 101 kmHigh 7.5°C · Low -2.9°C · 38 mm rain
- Naz̧arābād in DecemberIran · 107 kmHigh 7.7°C · Low -1.4°C · 40 mm rain
- Tehran in DecemberIran · 107 kmHigh 7.6°C · Low -2.2°C · 43 mm rain
- Pardīs in DecemberIran · 107 kmHigh 3.2°C · Low -4.7°C · 36 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 Chālūs) is explained once on the Chālūs year overview and on the Sources, method and limits page.