Mason City Climate by Month
Mason City, Iowa, United States
Warm summers and freezing winters, with rain spread through the year.
Warm summers and freezing winters, with rain spread through the year: that's Mason City's climate in short. Expect highs of 84°F (29°C) in July and 26°F (-3°C) in January, with the coldest nights (January) near 9°F (-13°C). It gets 34 in (856 mm) of rain a year, spread across the months.
- Warmest month
- 84°F(29°C)
- Average high, July
- Coldest nights
- 9°F(-13°C)
- Average low, January
- Rain per year
- 34 in(856 mm)
- No clear rainy season
- Humidity
- 74%
- Sunniest: July
Best and worst months in Mason City
Best for weatherSeptember is the best time for weather in Mason City: highs near 75°F (24°C) and about 3.6 in (92 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 26°F (-3°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Mason City weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 26°F(-3°C) | 9°F(-13°C) | 0.8 in(20 mm) | 91% | 1.5 |
| FebFebruary | 30°F(-1°C) | 13°F(-11°C) | 1.0 in(25 mm) | 76% | 2.4 |
| MarMarch | 44°F(7°C) | 26°F(-3°C) | 1.9 in(47 mm) | 73% | 3.6 |
| AprApril | 58°F(15°C) | 37°F(3°C) | 3.2 in(82 mm) | 62% | 4.5 |
| MayMay | 71°F(21°C) | 48°F(9°C) | 4.5 in(115 mm) | 63% | 5.2 |
| JunJune | 81°F(27°C) | 59°F(15°C) | 5.2 in(133 mm) | 69% | 5.9 |
| JulJuly | 84°F(29°C) | 63°F(17°C) | 4.2 in(106 mm) | 75% | 6.1 |
| AugAugust | 82°F(28°C) | 60°F(16°C) | 4.1 in(104 mm) | 78% | 5.3 |
| SepSeptemberBest | 75°F(24°C) | 52°F(11°C) | 3.6 in(92 mm) | 70% | 4.3 |
| OctOctober | 61°F(16°C) | 39°F(4°C) | 2.5 in(64 mm) | 64% | 2.7 |
| NovNovember | 44°F(7°C) | 26°F(-3°C) | 1.4 in(36 mm) | 72% | 1.7 |
| DecDecember | 30°F(-1°C) | 15°F(-10°C) | 1.3 in(32 mm) | 97% | 1.2 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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