Shell Rock, IA
Climate overview — based on NOAA 1991-2020 normals from ALLISON, IA US.
Year-round temperatures (°F)
Climate summary
Shell Rock has an annual average temperature of 46.7°F with about 35.4 inches of precipitation per year. The warmest month is July (average high 82.7°F), and the coldest is January (average low 7.5°F). June is typically the wettest month (5.46 in) and January the driest (0.94 in).
Best time to visit Shell Rock
Full guide →Climate change signal
All-time records →37 of 366 (10.1%) of Shell Rock'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.
| 1910s | 14 | |
| 1920s | 33 | |
| 1930s | 85 | |
| 1940s | 36 | |
| 1950s | 21 | |
| 1960s | 26 | |
| 1970s | 9 | |
| 1980s | 33 | |
| 1990s | 25 | |
| 2000s | 25 | |
| 2010s | 38 | |
| 2020s | 21 |
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 | 25.0°F | 7.5°F | 16.2°F | 0.94 in | — | 5 |
| February | 29.4°F | 11.5°F | 20.5°F | 1.04 in | — | 5 |
| March | 43.4°F | 24.1°F | 33.7°F | 1.79 in | — | 7 |
| April | 58.5°F | 35.9°F | 47.2°F | 3.81 in | — | 9 |
| May | 70.2°F | 48.6°F | 59.4°F | 5.13 in | — | 12 |
| June | 79.8°F | 59.3°F | 69.6°F | 5.46 in | — | 11 |
| July | 82.7°F | 62.8°F | 72.7°F | 4.20 in | — | 8 |
| August | 80.4°F | 60.2°F | 70.3°F | 4.04 in | — | 8 |
| September | 74.3°F | 51.2°F | 62.8°F | 3.37 in | — | 8 |
| October | 61.0°F | 39.0°F | 50.0°F | 2.51 in | — | 7 |
| November | 44.3°F | 25.4°F | 34.9°F | 1.76 in | — | 5 |
| December | 30.5°F | 14.6°F | 22.6°F | 1.35 in | — | 6 |
Climate twins of Shell Rock
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).