Decorah, IA Weather & Climate Normals
Decorah's real weather, in one number
Decorah, IA scores 42/100 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.
Decorah's hottest and coldest months
Decorah's hottest month is Jul, averaging 74°F; its coldest is Jan, averaging 19°F, a 54.4°F swing across the year, one of the widest gaps in this dataset.
Decorah's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 28°F | 10°F | 1.01in | 10.3in |
| Feb | 33°F | 14°F | 1.1in | 8.3in |
| Mar | 46°F | 26°F | 2.05in | 5.7in |
| Apr | 61°F | 37°F | 3.95in | 1.7in |
| May | 73°F | 48°F | 4.94in | 0in |
| Jun | 81°F | 59°F | 6.13in | 0in |
| Jul | 84°F | 63°F | 4.42in | 0in |
| Aug | 83°F | 61°F | 4.39in | 0in |
| Sep | 76°F | 52°F | 3.6in | 0in |
| Oct | 63°F | 40°F | 2.66in | 0in |
| Nov | 47°F | 28°F | 2.05in | 2.4in |
| Dec | 33°F | 17°F | 1.31in | 9.1in |
May, Jun, Jul, Aug, and Sep are the best time to see Decorah at its mildest; the rest of the year, plan around Jan's cold.
Rain and snow in Decorah
Decorah averages 37.61in of precipitation a year across roughly 114 days with measurable rain or snow, and 37.5in of snow a year.
Where Decorah ranks
Decorah ranks 4289 of 4876 US cities in this dataset for comfort score, and 55 of 85 within IA. About 7,454 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Decorah, IA US, 0.6 miles from Decorah, 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