LaSalle, IL Weather & Climate Normals
What a normal year in LaSalle actually looks like
On the 30-year record NOAA keeps for LaSalle, 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 LaSalle's weather actually swings
Average temperatures in LaSalle 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.
LaSalle, 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 LaSalle's mildest stretch; if you're moving there, you should plan around Jan's cold instead.
How wet LaSalle actually gets
Over a typical year, LaSalle sees about 38.05in of precipitation a year across roughly 121 days with measurable rain or snow, with 28.5in of snow a year.
LaSalle against the rest of the country
Out of 4876 cities scored here, LaSalle comes in at 3840; within IL alone it ranks 208 of 330. Population is about 9,424.
Checking the actual forecast
These figures come from Peru, IL US, the NOAA station 1.2 miles from LaSalle, 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