Peru, IL Weather & Climate Normals
What a normal year in Peru actually looks like
On the 30-year record NOAA keeps for Peru, IL, the comfort score comes out to 44/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 5 months a year land in the 55–75°F range this site treats as mild.
How much Peru's weather actually swings
Average temperatures in Peru run from 22°F in Jan up to 73°F in Jul, a 51.4°F seasonal swing, one of the widest gaps in this dataset.
Peru, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 30°F | 14°F | 1.81in | 8.6in |
| Feb | 35°F | 18°F | 1.77in | 5.5in |
| Mar | 48°F | 27°F | 2.28in | 4in |
| Apr | 61°F | 38°F | 3.77in | 0.6in |
| May | 73°F | 49°F | 4.49in | 0in |
| Jun | 81°F | 59°F | 4.62in | 0in |
| Jul | 84°F | 63°F | 3.89in | 0in |
| Aug | 82°F | 61°F | 3.7in | 0in |
| Sep | 77°F | 53°F | 3.41in | 0in |
| Oct | 64°F | 41°F | 3.5in | 0.2in |
| Nov | 48°F | 30°F | 2.71in | 0.9in |
| Dec | 36°F | 20°F | 2.1in | 8.7in |
If you're timing a visit, May, Jun, Jul, Aug, and Sep are Peru's mildest stretch; if you're moving there, you should plan around Jan's cold instead.
How wet Peru actually gets
Over a typical year, Peru sees about 38.05in of precipitation a year across roughly 121 days with measurable rain or snow, with 28.5in of snow a year.
Peru against the rest of the country
Out of 4876 cities scored here, Peru comes in at 3832; within IL alone it ranks 207 of 330. Population is about 9,793.
Checking the actual forecast
These figures come from Peru, IL US, the NOAA station 1.8 miles from Peru, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why this uses the nearest NOAA station · How the comfort score is calculated