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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 96°F, while the coldest is January averaging around 27°F at night. Precipitation totals about 5 inches a year and is strongly seasonal — March alone averages 1.0 inches while September barely receives 0.06 inches.
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 (°F) | 52 | 57 | 66 | 76 | 86 | 94 | 96 | 94 | 89 | 79 | 66 | 57 |
| Avg temp (°F) | 39 | 44 | 53 | 63 | 72 | 80 | 82 | 78 | 72 | 62 | 51 | 43 |
| Avg low (°F) | 27 | 32 | 40 | 50 | 58 | 65 | 69 | 63 | 55 | 46 | 36 | 29 |
| Precipitation (in) | 0.8 | 0.9 | 1.0 | 0.9 | 0.2 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.2 | 0.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 52 | 57 | 66 | 76 | 86 | 94 |
| Avg temp (°F) | 39 | 44 | 53 | 63 | 72 | 80 |
| Avg low (°F) | 27 | 32 | 40 | 50 | 58 | 65 |
| Precipitation (in) | 0.8 | 0.9 | 1.0 | 0.9 | 0.2 | 0.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 96 | 94 | 89 | 79 | 66 | 57 |
| Avg temp (°F) | 82 | 78 | 72 | 62 | 51 | 43 |
| Avg low (°F) | 69 | 63 | 55 | 46 | 36 | 29 |
| Precipitation (in) | 0.1 | 0.2 | 0.1 | 0.1 | 0.2 | 0.6 |
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 (mph) | 6.5 | 7.4 | 7.4 | 7.0 | 7.9 | 11.2 | 15.0 | 13.8 | 9.7 | 6.5 | 5.6 | 5.7 |
| 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 (mph) | 6.5 | 7.4 | 7.4 | 7.0 | 7.9 | 11.2 |
| 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 (mph) | 15.0 | 13.8 | 9.7 | 6.5 | 5.6 | 5.7 |
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.