Marshalltown, IA Weather & Climate Normals
Marshalltown's real weather, in one number
Marshalltown, IA scores 44/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 5 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Marshalltown's hottest and coldest months
Marshalltown's hottest month is Jul, averaging 73°F; its coldest is Jan, averaging 18°F, a 54.8°F swing across the year, one of the widest gaps in this dataset.
Marshalltown's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 28°F | 9°F | 0.97in | 6.3in |
| Feb | 32°F | 13°F | 1.16in | 5.3in |
| Mar | 45°F | 25°F | 2.1in | 3.3in |
| Apr | 60°F | 36°F | 3.82in | 0.7in |
| May | 71°F | 49°F | 4.94in | 0in |
| Jun | 80°F | 59°F | 5.93in | 0in |
| Jul | 84°F | 63°F | 4.58in | 0in |
| Aug | 82°F | 60°F | 4.37in | 0in |
| Sep | 75°F | 51°F | 3.85in | 0in |
| Oct | 62°F | 39°F | 2.66in | 0.2in |
| Nov | 47°F | 26°F | 2.1in | 1.7in |
| Dec | 34°F | 16°F | 1.39in | 7.8in |
May, Jun, Jul, Aug, and Sep are the best time to see Marshalltown at its mildest; the rest of the year, plan around Jan's cold.
Rain and snow in Marshalltown
Marshalltown averages 37.87in of precipitation a year across roughly 105 days with measurable rain or snow, and 25.3in of snow a year.
Where Marshalltown ranks
Marshalltown ranks 3732 of 4876 US cities in this dataset for comfort score, and 23 of 85 within IA. About 27,886 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Marshalltown, IA US, 2.3 miles from Marshalltown, not a prediction for any specific day.
More on how this is worked out
What a 30-year climate normal actually is · Why this uses the nearest NOAA station