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Bīrjand, Iran climate
BWk Cold desert
Bīrjand has a seasonal mild-temperate climate (Cold desert, Köppen BWk). The hottest month is July with an average daily high near 36°C, while the coldest is January averaging around −3°C at night. Precipitation totals about 135 mm a year and is strongly seasonal — March alone averages 25 mm while September barely receives 1 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Bīrjand climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 14 | 19 | 25 | 30 | 35 | 36 | 34 | 31 | 26 | 19 | 14 |
| Avg temp (°C) | 4 | 7 | 11 | 17 | 22 | 27 | 28 | 26 | 22 | 17 | 11 | 6 |
| Avg low (°C) | −3 | 0 | 4 | 10 | 14 | 19 | 20 | 17 | 13 | 8 | 2 | −2 |
| Precipitation (mm) | 21 | 24 | 25 | 23 | 6 | 3 | 3 | 5 | 1 | 2 | 6 | 15 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 14 | 19 | 25 | 30 | 35 |
| Avg temp (°C) | 4 | 7 | 11 | 17 | 22 | 27 |
| Avg low (°C) | −3 | 0 | 4 | 10 | 14 | 19 |
| Precipitation (mm) | 21 | 24 | 25 | 23 | 6 | 3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 36 | 34 | 31 | 26 | 19 | 14 |
| Avg temp (°C) | 28 | 26 | 22 | 17 | 11 | 6 |
| Avg low (°C) | 20 | 17 | 13 | 8 | 2 | −2 |
| Precipitation (mm) | 3 | 5 | 1 | 2 | 6 | 15 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 49 | 53 | 57 | 57 | 47 | 35 | 28 | 27 | 29 | 34 | 44 | 45 |
| Relative humidity (%) | 56 | 54 | 50 | 42 | 31 | 22 | 22 | 21 | 22 | 28 | 41 | 51 |
| Wind speed (m/s) | 2.9 | 3.3 | 3.3 | 3.1 | 3.6 | 5.0 | 6.7 | 6.2 | 4.3 | 2.9 | 2.5 | 2.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 49 | 53 | 57 | 57 | 47 | 35 |
| Relative humidity (%) | 56 | 54 | 50 | 42 | 31 | 22 |
| Wind speed (m/s) | 2.9 | 3.3 | 3.3 | 3.1 | 3.6 | 5.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 28 | 27 | 29 | 34 | 44 | 45 |
| Relative humidity (%) | 22 | 21 | 22 | 28 | 41 | 51 |
| Wind speed (m/s) | 6.7 | 6.2 | 4.3 | 2.9 | 2.5 | 2.6 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Birjand, a weather station, about 5 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.