Clear Lake, IA
Climate overview — based on NOAA 1991-2020 normals from MASON CITY MUNI AP, IA US.
Year-round temperatures (°F)
Climate summary
Clear Lake has an annual average temperature of 45.6°F with about 36.3 inches of precipitation per year and 44.4 inches of snow. The warmest month is July (average high 82.5°F), and the coldest is January (average low 7.2°F). June is typically the wettest month (5.39 in) and January the driest (0.89 in). Snow typically falls from October through May.
Best time to visit Clear Lake
Full guide →Climate change signal
All-time records →68 of 366 (18.6%) of Clear Lake'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.
| 1940s | 13 | |
| 1950s | 30 | |
| 1960s | 44 | |
| 1970s | 39 | |
| 1980s | 61 | |
| 1990s | 38 | |
| 2000s | 39 | |
| 2010s | 51 | |
| 2020s | 51 |
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 | 24.2°F | 7.2°F | 15.7°F | 0.89 in | 11.3 in | 8 |
| February | 28.5°F | 11.4°F | 20.0°F | 1.22 in | 10.0 in | 8 |
| March | 42.1°F | 23.6°F | 32.9°F | 2.29 in | 7.0 in | 9 |
| April | 57.5°F | 34.5°F | 46.0°F | 4.15 in | 3.0 in | 12 |
| May | 69.6°F | 46.8°F | 58.2°F | 5.15 in | 0.3 in | 14 |
| June | 79.6°F | 57.3°F | 68.5°F | 5.39 in | — | 12 |
| July | 82.5°F | 60.5°F | 71.5°F | 4.43 in | — | 10 |
| August | 80.2°F | 57.6°F | 68.9°F | 3.79 in | — | 9 |
| September | 74.1°F | 48.8°F | 61.4°F | 3.45 in | — | 9 |
| October | 59.9°F | 36.6°F | 48.2°F | 2.53 in | 0.4 in | 9 |
| November | 43.6°F | 24.3°F | 33.9°F | 1.67 in | 3.0 in | 8 |
| December | 29.7°F | 13.5°F | 21.6°F | 1.29 in | 9.4 in | 8 |
Climate twins of Clear Lake
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).