Bol, Chad climate
BSh Hot semi-arid
Bol has a mildly seasonal tropical climate (Hot semi-arid, Köppen BSh). The hottest month is April with an average daily high near 107°F, while the coldest is January averaging around 59°F at night. Precipitation totals about 26 inches a year and is strongly seasonal — August alone averages 8.1 inches while February barely receives 0.07 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)Bol climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 91 | 97 | 103 | 107 | 106 | 100 | 93 | 89 | 93 | 99 | 99 | 93 |
| Avg temp (°F) | 75 | 81 | 88 | 93 | 93 | 89 | 84 | 81 | 83 | 86 | 82 | 76 |
| Avg low (°F) | 59 | 65 | 73 | 79 | 80 | 78 | 74 | 73 | 74 | 73 | 66 | 60 |
| Precipitation (in) | 0.1 | 0.1 | 0.1 | 0.5 | 1.6 | 2.9 | 6.9 | 8.1 | 4.2 | 1.5 | 0.1 | 0.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 91 | 97 | 103 | 107 | 106 | 100 |
| Avg temp (°F) | 75 | 81 | 88 | 93 | 93 | 89 |
| Avg low (°F) | 59 | 65 | 73 | 79 | 80 | 78 |
| Precipitation (in) | 0.1 | 0.1 | 0.1 | 0.5 | 1.6 | 2.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 93 | 89 | 93 | 99 | 99 | 93 |
| Avg temp (°F) | 84 | 81 | 83 | 86 | 82 | 76 |
| Avg low (°F) | 74 | 73 | 74 | 73 | 66 | 60 |
| Precipitation (in) | 6.9 | 8.1 | 4.2 | 1.5 | 0.1 | 0.2 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 25 | 28 | 41 | 52 | 57 | 62 | 70 | 75 | 59 | 40 | 26 | 20 |
| Relative humidity (%) | 17 | 14 | 13 | 20 | 35 | 50 | 65 | 77 | 75 | 56 | 26 | 20 |
| Wind speed (mph) | 8.1 | 8.6 | 8.5 | 6.8 | 6.0 | 6.0 | 5.1 | 3.9 | 3.6 | 4.1 | 6.6 | 7.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 25 | 28 | 41 | 52 | 57 | 62 |
| Relative humidity (%) | 17 | 14 | 13 | 20 | 35 | 50 |
| Wind speed (mph) | 8.1 | 8.6 | 8.5 | 6.8 | 6.0 | 6.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 70 | 75 | 59 | 40 | 26 | 20 |
| Relative humidity (%) | 65 | 77 | 75 | 56 | 26 | 20 |
| Wind speed (mph) | 5.1 | 3.9 | 3.6 | 4.1 | 6.6 | 7.7 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Ndjamena Hassan Djamous, a weather station, about 152 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.