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Bo, Sierra Leone climate
Am Tropical monsoon
Bo has a remarkably steady tropical climate (Tropical monsoon, Köppen Am). The hottest month is March with an average daily high near 95°F, while the coldest is August averaging around 72°F at night. Precipitation totals about 101 inches a year and is strongly seasonal — August alone averages 19.0 inches while January barely receives 0.78 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)Bo climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 90 | 93 | 95 | 94 | 90 | 86 | 83 | 82 | 83 | 84 | 86 | 88 |
| Avg temp (°F) | 79 | 83 | 85 | 85 | 83 | 80 | 78 | 77 | 78 | 79 | 79 | 78 |
| Avg low (°F) | 68 | 72 | 75 | 76 | 76 | 74 | 72 | 72 | 72 | 73 | 73 | 69 |
| Precipitation (in) | 0.8 | 0.9 | 2.5 | 5.0 | 10.1 | 13.5 | 16.0 | 19.0 | 17.4 | 10.2 | 4.4 | 1.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 90 | 93 | 95 | 94 | 90 | 86 |
| Avg temp (°F) | 79 | 83 | 85 | 85 | 83 | 80 |
| Avg low (°F) | 68 | 72 | 75 | 76 | 76 | 74 |
| Precipitation (in) | 0.8 | 0.9 | 2.5 | 5.0 | 10.1 | 13.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 83 | 82 | 83 | 84 | 86 | 88 |
| Avg temp (°F) | 78 | 77 | 78 | 79 | 79 | 78 |
| Avg low (°F) | 72 | 72 | 72 | 73 | 73 | 69 |
| Precipitation (in) | 16.0 | 19.0 | 17.4 | 10.2 | 4.4 | 1.2 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with high ≥ 90°F (days) | 11 | 21 | 26 | 23 | 14 | 5 | 0.8 | 0.2 | 0.5 | 0.9 | 3 | 6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with high ≥ 90°F (days) | 11 | 21 | 26 | 23 | 14 | 5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with high ≥ 90°F (days) | 0.8 | 0.2 | 0.5 | 0.9 | 3 | 6 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 34 | 37 | 50 | 62 | 75 | 78 | 85 | 88 | 84 | 77 | 63 | 41 |
| Relative humidity (%) | 71 | 70 | 67 | 70 | 80 | 87 | 89 | 91 | 91 | 89 | 85 | 77 |
| Wind speed (mph) | 2.8 | 3.2 | 3.6 | 3.5 | 3.2 | 3.6 | 4.3 | 4.5 | 3.7 | 2.8 | 2.2 | 2.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 34 | 37 | 50 | 62 | 75 | 78 |
| Relative humidity (%) | 71 | 70 | 67 | 70 | 80 | 87 |
| Wind speed (mph) | 2.8 | 3.2 | 3.6 | 3.5 | 3.2 | 3.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 85 | 88 | 84 | 77 | 63 | 41 |
| Relative humidity (%) | 89 | 91 | 91 | 89 | 85 | 77 |
| Wind speed (mph) | 4.3 | 4.5 | 3.7 | 2.8 | 2.2 | 2.5 |
Methodology & sources
Temperature & precipitation — modelled for this location from ERA5-Land reanalysis, a ~9 km global grid, because no long-record weather station is close enough to use.
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.