Mason City, IA Weather & Climate Normals
Mason City's real weather, in one number
Mason City, IA scores 46/100 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.
Mason City's hottest and coldest months
Mason City's hottest month is Jul, averaging 72°F; its coldest is Jan, averaging 16°F, a 56.2°F swing across the year, one of the widest gaps in this dataset.
Mason City's weather across the year
| Month | Avg high | Avg low | Precip |
|---|---|---|---|
| Jan | 24°F | 7°F | 0.89in |
| Feb | 29°F | 11°F | 1.07in |
| Mar | 41°F | 23°F | 1.95in |
| Apr | 56°F | 35°F | 3.91in |
| May | 69°F | 47°F | 5.58in |
| Jun | 79°F | 58°F | 5.7in |
| Jul | 82°F | 62°F | 4.63in |
| Aug | 80°F | 59°F | 3.71in |
| Sep | 74°F | 50°F | 3.24in |
| Oct | 60°F | 38°F | 2.55in |
| Nov | 43°F | 25°F | 1.79in |
| Dec | 30°F | 14°F | 1.25in |
May, Jun, Jul, Aug, and Sep are the best time to see Mason City at its mildest; the rest of the year, plan around Jan's cold.
Rain and snow in Mason City
Over a typical year, Mason City sees about 36.27in of precipitation a year across roughly 107 days with measurable rain or snow. That station has no snowfall reading, so none is shown rather than assumed.
Where Mason City ranks
Mason City ranks 2974 of 4876 US cities in this dataset for comfort score, and 13 of 85 within IA. About 26,948 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Mason City, IA US, 1.1 miles from Mason City, not a prediction for any specific day.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is