Princeton, IL Weather & Climate Normals
What a normal year in Princeton actually looks like
On the 30-year record NOAA keeps for Princeton, 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 Princeton's weather actually swings
Average temperatures in Princeton run from 22°F in Jan up to 74°F in Jul, a 51.8°F seasonal swing, one of the widest gaps in this dataset.
Princeton, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 30°F | 14°F | 1.96in | 8.6in |
| Feb | 35°F | 18°F | 2in | 6.9in |
| Mar | 48°F | 28°F | 2.52in | 3.7in |
| Apr | 62°F | 38°F | 4.03in | 0.9in |
| May | 73°F | 50°F | 5.07in | 0in |
| Jun | 82°F | 60°F | 4.64in | 0in |
| Jul | 85°F | 63°F | 3.66in | 0in |
| Aug | 82°F | 61°F | 4.02in | 0in |
| Sep | 76°F | 53°F | 3.9in | 0in |
| Oct | 63°F | 42°F | 3.14in | 0.3in |
| Nov | 48°F | 30°F | 2.61in | 1.3in |
| Dec | 35°F | 20°F | 2.24in | 6.8in |
If you're timing a visit, May, Jun, Jul, Aug, and Sep are Princeton's mildest stretch; if you're moving there, you should plan around Jan's cold instead.
How wet Princeton actually gets
Over a typical year, Princeton sees about 39.79in of precipitation a year across roughly 103 days with measurable rain or snow, with 28.5in of snow a year.
Princeton against the rest of the country
Out of 4876 cities scored here, Princeton comes in at 3885; within IL alone it ranks 217 of 330. Population is about 7,667.
Checking the actual forecast
These figures come from Princeton, IL US, the NOAA station 1.2 miles from Princeton, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is