Alton, IA
Climate overview — based on NOAA 1991-2020 normals from ALTON, IA US.
Year-round temperatures (°F)
Avg high
Avg low
Best time to visit Alton
Full guide →Climate change signal
All-time records →0 of 366 (0%) of Alton'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.
| 1900s | 17 | |
| 1910s | 60 | |
| 1920s | 44 | |
| 1930s | 157 | |
| 1940s | 73 | |
| 1950s | 15 | |
| 1960s | 0 | |
| 1970s | 0 | |
| 1980s | 0 | |
| 1990s | 0 | |
| 2000s | 0 |
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 | °F | °F | °F | 0.76 in | 6.4 in | 5 |
| February | °F | °F | °F | 0.74 in | 4.8 in | 5 |
| March | °F | °F | °F | 1.76 in | 5.2 in | 6 |
| April | °F | °F | °F | 2.85 in | 1.2 in | 8 |
| May | °F | °F | °F | 3.82 in | — | 10 |
| June | °F | °F | °F | 3.93 in | — | 10 |
| July | °F | °F | °F | 3.45 in | — | 8 |
| August | °F | °F | °F | 3.53 in | — | 7 |
| September | °F | °F | °F | 2.92 in | — | 7 |
| October | °F | °F | °F | 2.28 in | 0.3 in | 6 |
| November | °F | °F | °F | 1.32 in | 3.1 in | 5 |
| December | °F | °F | °F | 0.98 in | 5.6 in | 5 |
Last spring / first fall frost
All-time recordsHottest, coldest, wettest
Planting calendarWhat to plant, and when