Climate averages 1991–2020
Semnan weather
in January.
A cold, very dry month: the coolest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cold month in Semnan: daytime highs average 7.1°C and nights cool to about -1.0°C. By daytime temperature it is the coolest month of the year.
Expect about 12 mm of rain on roughly 3 days, which makes January a very dry month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 03 min on an average January day.
The nearest other city in this atlas is Qā’em Shahr (110 km away). In January its highs average 12.1°C, 5.0°C warmer than Semnan, with 63 mm of rain.
Among the 128 cities listed in Iran, Semnan ranks joint 71st of 128 for the warmest January highs and 1st of 128 for the driest January (rainfall, lowest first). The mean January high of those 128 cities is 8.6°C; Semnan is 1.5°C cooler than that mean.
From January to February, average highs rise by 2.5°C to 9.6°C, and monthly rainfall rises from 12 mm to 14 mm.
The annual picture
January 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
Semnan climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 7.1°C-1.0°C | -1.0°C | 12 | 3.3 | 10.010 h |
| February | 9.6°C0.4°C | 0.4°C | 14 | 3.1 | 10.911 h |
| March | 15.3°C4.7°C | 4.7°C | 18 | 3.9 | 11.912 h |
| April | 21.9°C10.4°C | 10.4°C | 13 | 2.8 | 13.113 h |
| May | 27.7°C15.2°C | 15.2°C | 4.8 | 1.3 | 14.014 h |
| June | 32.8°C19.5°C | 19.5°C | 1.2 | 0.3 | 14.515 h |
| July | 35.3°C22.4°C | 22.4°C | 1.0 | 0.3 | 14.314 h |
| August | 34.3°C21.7°C | 21.7°C | 1.2 | 0.3 | 13.514 h |
| September | 29.8°C18.0°C | 18.0°C | 1.7 | 0.5 | 12.412 h |
| October | 22.8°C12.5°C | 12.5°C | 4.5 | 1.2 | 11.311 h |
| November | 13.9°C5.8°C | 5.8°C | 11 | 3.1 | 10.310 h |
| December | 8.4°C1.2°C | 1.2°C | 10 | 3.2 | 9.810 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
January in nearby cities
- Qā’em Shahr in JanuaryIran · 110 kmHigh 12.1°C · Low 1.5°C · 63 mm rain
- Sari in JanuaryIran · 114 kmHigh 12.2°C · Low 1.8°C · 69 mm rain
- Behshahr in JanuaryIran · 125 kmHigh 12.7°C · Low 3.6°C · 64 mm rain
- Bābol in JanuaryIran · 126 kmHigh 12.0°C · Low 2.9°C · 63 mm rain
- Āmol in JanuaryIran · 136 kmHigh 10.5°C · Low 1.7°C · 128 mm rain
- Būmahen in JanuaryIran · 139 kmHigh 1.8°C · Low -6.0°C · 36 mm precipitation
- Pardīs in JanuaryIran · 144 kmHigh 0.8°C · Low -7.6°C · 36 mm precipitation
- Pākdasht in JanuaryIran · 155 kmHigh 8.2°C · Low -1.9°C · 30 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 Semnan) is explained once on the Semnan year overview and on the Sources, method and limits page.