Climate averages 1991–2020
Būmahen weather
in December.
A cold, fairly dry month: the 10th warmest and the joint 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cold month in Būmahen: daytime highs average 4.3°C and nights cool to about -3.1°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 36 mm of rain on roughly 7 days, which makes December a fairly dry month (the joint 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 47 min on an average December day.
The nearest other city in this atlas is Pardīs (5 km away). In December its highs average 3.2°C, 1.1°C cooler than Būmahen, with 36 mm of rain.
Among the 128 cities listed in Iran, Būmahen ranks joint 125th of 128 for the warmest December highs and joint 52nd of 128 for the driest December (rainfall, lowest first). The mean December high of those 128 cities is 10.9°C; Būmahen is 6.6°C cooler than that mean.
From December to January, average highs fall by 2.5°C to 1.8°C, and monthly precipitation stays at 36 mm.
The annual picture
December in context
Monthly precipitation
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
Būmahen climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 1.8°C-6.0°C | -6.0°C | 36 | 6.7 | 10.010 h |
| February | 3.5°C-4.5°C | -4.5°C | 44 | 8.1 | 10.911 h |
| March | 8.8°C0.3°C | 0.3°C | 59 | 9.6 | 11.912 h |
| April | 15.7°C6.6°C | 6.6°C | 50 | 9.7 | 13.113 h |
| May | 22.2°C12.6°C | 12.6°C | 24 | 5.1 | 14.014 h |
| June | 28.5°C18.0°C | 18.0°C | 6.7 | 1.8 | 14.515 h |
| July | 31.4°C21.5°C | 21.5°C | 5.2 | 1.3 | 14.314 h |
| August | 30.3°C20.8°C | 20.8°C | 5.0 | 1.1 | 13.514 h |
| September | 25.7°C17.1°C | 17.1°C | 5.7 | 1.3 | 12.412 h |
| October | 18.6°C11.0°C | 11.0°C | 20 | 3.9 | 11.311 h |
| November | 9.8°C2.7°C | 2.7°C | 40 | 6.8 | 10.310 h |
| December, selected | 4.3°C-3.1°C | -3.1°C | 36 | 7.0 | 9.810 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet 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
- Pardīs in DecemberIran · 5 kmHigh 3.2°C · Low -4.7°C · 36 mm rain
- Pākdasht in DecemberIran · 33 kmHigh 9.9°C · Low 0.6°C · 30 mm rain
- Tehran in DecemberIran · 41 kmHigh 7.6°C · Low -2.2°C · 43 mm rain
- Tajrīsh in DecemberIran · 41 kmHigh 5.0°C · Low -4.6°C · 43 mm rain
- Qarchak in DecemberIran · 43 kmHigh 10.2°C · Low -0.1°C · 40 mm rain
- Varāmīn in DecemberIran · 49 kmHigh 10.7°C · Low 0.1°C · 22 mm rain
- Eslamshahr in DecemberIran · 61 kmHigh 9.3°C · Low -1.0°C · 45 mm rain
- Golestān in DecemberIran · 66 kmHigh 9.9°C · Low -0.3°C · 45 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 Būmahen) is explained once on the Būmahen year overview and on the Sources, method and limits page.
Pardīs lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.