Mount Vernon, IA
Climate overview — based on NOAA 1991-2020 normals from CEDAR RAPIDS #1, IA US.
Year-round temperatures (°F)
Climate summary
Mount Vernon has an annual average temperature of 49.9°F with about 38.8 inches of precipitation per year and 34.3 inches of snow. The warmest month is July (average high 85.5°F), and the coldest is January (average low 12.5°F). June is typically the wettest month (5.68 in) and January the driest (1.17 in). Snow typically falls from October through April.
Best time to visit Mount Vernon
Full guide →Climate change signal
All-time records →39 of 366 (10.7%) of Mount Vernon'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 | 33 | |
| 1900s | 19 | |
| 1910s | 47 | |
| 1920s | 48 | |
| 1930s | 60 | |
| 1940s | 17 | |
| 1950s | 13 | |
| 1960s | 7 | |
| 1970s | 8 | |
| 1980s | 20 | |
| 1990s | 18 | |
| 2000s | 21 | |
| 2010s | 30 | |
| 2020s | 25 |
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 | 30.0°F | 12.5°F | 21.3°F | 1.17 in | 8.7 in | 9 |
| February | 35.1°F | 16.6°F | 25.9°F | 1.34 in | 8.3 in | 8 |
| March | 48.9°F | 27.5°F | 38.2°F | 2.06 in | 4.0 in | 10 |
| April | 63.3°F | 38.4°F | 50.9°F | 4.02 in | 1.5 in | 11 |
| May | 73.8°F | 49.6°F | 61.7°F | 4.74 in | — | 13 |
| June | 82.3°F | 59.6°F | 71.0°F | 5.68 in | — | 12 |
| July | 85.5°F | 63.3°F | 74.4°F | 4.47 in | — | 10 |
| August | 83.4°F | 61.2°F | 72.3°F | 4.42 in | — | 10 |
| September | 77.3°F | 53.0°F | 65.2°F | 3.96 in | — | 9 |
| October | 64.1°F | 41.5°F | 52.8°F | 3.00 in | 0.6 in | 10 |
| November | 48.1°F | 29.3°F | 38.7°F | 2.22 in | 2.2 in | 8 |
| December | 34.7°F | 18.6°F | 26.7°F | 1.67 in | 9.0 in | 9 |
Climate twins of Mount Vernon
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).