Chelsea, SD
Climate overview — based on NOAA 1991-2020 normals from MELLETTE 4 W, SD US.
Year-round temperatures (°F)
Climate summary
Chelsea has an annual average temperature of 42.8°F with about 23 inches of precipitation per year and 43.4 inches of snow. The warmest month is July (average high 83.7°F), and the coldest is January (average low 1.4°F). July is typically the wettest month (3.51 in) and January the driest (0.57 in). Snow typically falls from October through April.
Best time to visit Chelsea
Full guide →Climate change signal
All-time records →7 of 366 (1.9%) of Chelsea's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1890s | 12 | |
| 1900s | 28 | |
| 1910s | 22 | |
| 1920s | 24 | |
| 1930s | 86 | |
| 1940s | 34 | |
| 1950s | 27 | |
| 1960s | 15 | |
| 1970s | 22 | |
| 1980s | 33 | |
| 1990s | 20 | |
| 2000s | 25 | |
| 2010s | 18 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 22.1°F | 1.4°F | 11.8°F | 0.57 in | 8.5 in | 6 |
| February | 27.2°F | 5.1°F | 16.2°F | 0.65 in | 7.8 in | 6 |
| March | 40.0°F | 17.1°F | 28.6°F | 0.90 in | 5.6 in | 6 |
| April | 55.8°F | 29.2°F | 42.5°F | 2.11 in | 5.4 in | 8 |
| May | 68.5°F | 42.8°F | 55.7°F | 3.34 in | — | 11 |
| June | 78.5°F | 54.2°F | 66.3°F | 3.47 in | — | 11 |
| July | 83.7°F | 58.9°F | 71.3°F | 3.51 in | — | 9 |
| August | 81.8°F | 55.2°F | 68.5°F | 2.54 in | — | 8 |
| September | 73.8°F | 45.1°F | 59.5°F | 2.35 in | — | 7 |
| October | 58.5°F | 31.7°F | 45.1°F | 2.12 in | 0.9 in | 7 |
| November | 41.8°F | 18.6°F | 30.2°F | 0.73 in | 5.9 in | 5 |
| December | 27.7°F | 7.2°F | 17.5°F | 0.67 in | 9.3 in | 6 |
Climate twins of Chelsea
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).