Algonquin, IL Weather & Climate Normals
What a normal year in Algonquin actually looks like
On the 30-year record NOAA keeps for Algonquin, 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 Algonquin's weather actually swings
Average temperatures in Algonquin run from 22°F in Jan up to 74°F in Jul, a 51.6°F seasonal swing, one of the widest gaps in this dataset.
Algonquin, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 30°F | 14°F | 2.02in | 9.5in |
| Feb | 34°F | 17°F | 1.87in | 8in |
| Mar | 46°F | 26°F | 2.37in | 3.7in |
| Apr | 59°F | 37°F | 3.96in | 0.8in |
| May | 70°F | 48°F | 5.12in | 0in |
| Jun | 80°F | 58°F | 4.46in | 0in |
| Jul | 84°F | 63°F | 3.98in | 0in |
| Aug | 82°F | 61°F | 4.33in | 0in |
| Sep | 76°F | 53°F | 3.53in | 0in |
| Oct | 63°F | 41°F | 3.31in | 0in |
| Nov | 48°F | 30°F | 2.68in | 1.4in |
| Dec | 36°F | 20°F | 2.22in | 8.7in |
If you're timing a visit, May, Jun, Jul, Aug, and Sep are Algonquin's mildest stretch; if you're moving there, you should plan around Jan's cold instead.
How wet Algonquin actually gets
Over a typical year, Algonquin sees about 39.85in of precipitation a year across roughly 124 days with measurable rain or snow, with 32.1in of snow a year.
Algonquin against the rest of the country
Out of 4876 cities scored here, Algonquin comes in at 3723; within IL alone it ranks 177 of 330. Population is about 30,539.
Checking the actual forecast
These figures come from Elgin, IL US, the NOAA station 6.9 miles from Algonquin, 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