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Lethem, Guyana climate
As Tropical savanna (dry summer)
Lethem has a remarkably steady tropical climate (Tropical savanna (dry summer), Köppen As). The hottest month is October with an average daily high near 96°F, while the coldest is June averaging around 74°F at night. Precipitation totals about 69 inches a year and is strongly seasonal — May alone averages 13.7 inches while January barely receives 1.15 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)Lethem climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | — | 93 | 94 | 93 | 90 | 90 | 90 | 92 | 95 | 96 | 96 | 93 |
| Avg temp (°F) | — | 83 | 84 | 83 | 81 | 80 | 80 | 82 | 84 | 85 | 85 | 83 |
| Avg low (°F) | 76 | 76 | 77 | 76 | 75 | 74 | 74 | 75 | 76 | 77 | 77 | 76 |
| Precipitation (in) | 1.1 | 1.3 | 1.5 | 5.8 | 13.7 | 13.2 | 12.1 | 8.7 | 3.9 | 2.6 | 2.7 | 2.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | — | 93 | 94 | 93 | 90 | 90 |
| Avg temp (°F) | — | 83 | 84 | 83 | 81 | 80 |
| Avg low (°F) | 76 | 76 | 77 | 76 | 75 | 74 |
| Precipitation (in) | 1.1 | 1.3 | 1.5 | 5.8 | 13.7 | 13.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 90 | 92 | 95 | 96 | 96 | 93 |
| Avg temp (°F) | 80 | 82 | 84 | 85 | 85 | 83 |
| Avg low (°F) | 74 | 75 | 76 | 77 | 77 | 76 |
| Precipitation (in) | 12.1 | 8.7 | 3.9 | 2.6 | 2.7 | 2.4 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 60 | 67 | 67 | 75 | 78 | 73 | 70 | 65 | 57 | 59 | 63 | 62 |
| Relative humidity (%) | 59 | 56 | 56 | 68 | 81 | 85 | 86 | 84 | 81 | 76 | 73 | 68 |
| Wind speed (mph) | 6.9 | 7.4 | 6.8 | 5.3 | 4.0 | 3.6 | 3.2 | 3.2 | 3.4 | 3.6 | 4.0 | 5.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 60 | 67 | 67 | 75 | 78 | 73 |
| Relative humidity (%) | 59 | 56 | 56 | 68 | 81 | 85 |
| Wind speed (mph) | 6.9 | 7.4 | 6.8 | 5.3 | 4.0 | 3.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 70 | 65 | 57 | 59 | 63 | 62 |
| Relative humidity (%) | 86 | 84 | 81 | 76 | 73 | 68 |
| Wind speed (mph) | 3.2 | 3.2 | 3.4 | 3.6 | 4.0 | 5.6 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from INMET, Brazil's national meteorological institute, measured at Boa Vista, about 113 km from the city centre.
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.