Marengo, IL Weather & Climate Normals
Marengo's real weather, in one number
Marengo, IL 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.
Marengo's hottest and coldest months
Marengo's hottest month is Jul, averaging 73°F; its coldest is Jan, averaging 21°F, a 51.6°F swing across the year, one of the widest gaps in this dataset.
Marengo's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 29°F | 13°F | 1.67in | 8in |
| Feb | 33°F | 16°F | 1.64in | 9.1in |
| Mar | 45°F | 26°F | 2.08in | 2.4in |
| Apr | 59°F | 36°F | 3.81in | 0.4in |
| May | 70°F | 47°F | 4.57in | 0in |
| Jun | 80°F | 57°F | 4.62in | 0in |
| Jul | 84°F | 62°F | 4.05in | 0in |
| Aug | 82°F | 60°F | 4.22in | 0in |
| Sep | 75°F | 52°F | 3.68in | 0in |
| Oct | 62°F | 40°F | 2.98in | 0in |
| Nov | 47°F | 29°F | 2.35in | 1.6in |
| Dec | 35°F | 19°F | 1.94in | 9.3in |
May, Jun, Jul, Aug, and Sep are the best time to see Marengo at its mildest; the rest of the year, plan around Jan's cold.
Rain and snow in Marengo
Marengo averages 37.61in of precipitation a year across roughly 101 days with measurable rain or snow, and 30.8in of snow a year.
Where Marengo ranks
Marengo ranks 3884 of 4876 US cities in this dataset for comfort score, and 216 of 330 within IL. About 7,699 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Marengo, IL US, 1.3 miles from Marengo, 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