Marshalltown, IA
Climate overview — based on NOAA 1991-2020 normals from MARSHALLTWN POL CN PL, IA US.
Year-round temperatures (°F)
Avg high
Avg low
Best time to visit Marshalltown
Full guide →Climate change signal
All-time records →0 of 366 (0%) of Marshalltown'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.
| 1950s | 0 | |
| 1960s | 0 | |
| 1970s | 7 | |
| 1980s | 0 | |
| 1990s | 359 | |
| 2010s | 0 | |
| 2020s | 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 | 0.99 in | — | — |
| February | °F | °F | °F | 1.12 in | — | — |
| March | °F | °F | °F | 1.89 in | — | — |
| April | °F | °F | °F | 3.88 in | — | — |
| May | °F | °F | °F | 4.77 in | — | — |
| June | °F | °F | °F | 5.70 in | — | — |
| July | °F | °F | °F | 4.17 in | — | — |
| August | °F | °F | °F | 4.40 in | — | — |
| September | °F | °F | °F | 3.48 in | — | — |
| October | °F | °F | °F | 2.68 in | — | — |
| November | °F | °F | °F | 1.85 in | — | — |
| December | °F | °F | °F | 1.46 in | — | — |
Last spring / first fall frost
All-time recordsHottest, coldest, wettest
Planting calendarWhat to plant, and when