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Omitama, Japan climate
Cfa Humid subtropical
Omitama has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 86°F, while the coldest is January averaging around 29°F at night. Around 54 inches of precipitation falls each year, peaking in September (7.3 inches) and easing off in December (2.0 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)Omitama climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 49 | 50 | 55 | 64 | 72 | 76 | 83 | 86 | 80 | 70 | 61 | 53 |
| Avg temp (°F) | 38 | 39 | 45 | 54 | 63 | 69 | 76 | 78 | 72 | 62 | 51 | 42 |
| Avg low (°F) | 29 | 30 | 36 | 45 | 55 | 63 | 70 | 72 | 65 | 55 | 43 | 33 |
| Precipitation (in) | 2.1 | 2.1 | 4.0 | 4.6 | 5.7 | 5.3 | 5.6 | 4.6 | 7.3 | 7.3 | 3.1 | 2.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 49 | 50 | 55 | 64 | 72 | 76 |
| Avg temp (°F) | 38 | 39 | 45 | 54 | 63 | 69 |
| Avg low (°F) | 29 | 30 | 36 | 45 | 55 | 63 |
| Precipitation (in) | 2.1 | 2.1 | 4.0 | 4.6 | 5.7 | 5.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 83 | 86 | 80 | 70 | 61 | 53 |
| Avg temp (°F) | 76 | 78 | 72 | 62 | 51 | 42 |
| Avg low (°F) | 70 | 72 | 65 | 55 | 43 | 33 |
| Precipitation (in) | 5.6 | 4.6 | 7.3 | 7.3 | 3.1 | 2.0 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 58 | 62 | 65 | 66 | 70 | 80 | 78 | 68 | 74 | 69 | 62 | 57 |
| Relative humidity (%) | 78 | 76 | 76 | 78 | 81 | 85 | 86 | 85 | 85 | 83 | 81 | 80 |
| Wind speed (mph) | 5.5 | 5.6 | 5.5 | 4.9 | 4.1 | 3.4 | 3.2 | 3.3 | 4.1 | 4.5 | 4.7 | 5.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 58 | 62 | 65 | 66 | 70 | 80 |
| Relative humidity (%) | 78 | 76 | 76 | 78 | 81 | 85 |
| Wind speed (mph) | 5.5 | 5.6 | 5.5 | 4.9 | 4.1 | 3.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 78 | 68 | 74 | 69 | 62 | 57 |
| Relative humidity (%) | 86 | 85 | 85 | 83 | 81 | 80 |
| Wind speed (mph) | 3.2 | 3.3 | 4.1 | 4.5 | 4.7 | 5.2 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Mito, about 16 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.