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Cheonan, South Korea climate
Cwa Monsoon-influenced humid subtropical
Cheonan has a strongly seasonal cool-temperate climate (Monsoon-influenced humid subtropical, Köppen Cwa). The hottest month is August with an average daily high near 30°C, while the coldest is January averaging around −8°C at night. Precipitation totals about 788 mm a year and is strongly seasonal — July alone averages 228 mm while January barely receives 9 mm.
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)Cheonan climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 3 | 5 | 11 | 18 | 24 | 27 | 29 | 30 | 26 | 20 | 12 | 5 |
| Avg temp (°C) | −2 | 0 | 6 | 12 | 18 | 23 | 26 | 26 | 21 | 14 | 7 | 0 |
| Avg low (°C) | −8 | −5 | 0 | 6 | 12 | 18 | 22 | 22 | 16 | 8 | 2 | −5 |
| Precipitation (mm) | 9 | 13 | 19 | 35 | 53 | 66 | 228 | 211 | 85 | 37 | 30 | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 3 | 5 | 11 | 18 | 24 | 27 |
| Avg temp (°C) | −2 | 0 | 6 | 12 | 18 | 23 |
| Avg low (°C) | −8 | −5 | 0 | 6 | 12 | 18 |
| Precipitation (mm) | 9 | 13 | 19 | 35 | 53 | 66 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 30 | 26 | 20 | 12 | 5 |
| Avg temp (°C) | 26 | 26 | 21 | 14 | 7 | 0 |
| Avg low (°C) | 22 | 22 | 16 | 8 | 2 | −5 |
| Precipitation (mm) | 228 | 211 | 85 | 37 | 30 | — |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 53 | 54 | 55 | 56 | 59 | 69 | 76 | 70 | 63 | 51 | 54 | 53 |
| Relative humidity (%) | 76 | 73 | 75 | 75 | 77 | 79 | 86 | 85 | 81 | 76 | 75 | 76 |
| Wind speed (km/h) | 12.0 | 11.8 | 11.4 | 10.7 | 9.5 | 7.5 | 8.8 | 8.6 | 8.8 | 9.7 | 11.0 | 12.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 53 | 54 | 55 | 56 | 59 | 69 |
| Relative humidity (%) | 76 | 73 | 75 | 75 | 77 | 79 |
| Wind speed (km/h) | 12.0 | 11.8 | 11.4 | 10.7 | 9.5 | 7.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 70 | 63 | 51 | 54 | 53 |
| Relative humidity (%) | 86 | 85 | 81 | 76 | 75 | 76 |
| Wind speed (km/h) | 8.8 | 8.6 | 8.8 | 9.7 | 11.0 | 12.0 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 25 years of daily observations at A 511 / Desiderio Aaf-pyeongtaek / Camp Humphreys Rok, a weather station, about 21 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.