Troy, IL Weather & Climate Normals
What a normal year in Troy actually looks like
On the 30-year record NOAA keeps for Troy, IL, the comfort score comes out to 43/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 4 months a year land in the 55–75°F range this site treats as mild.
How much Troy's weather actually swings
Average temperatures in Troy run from 34°F in Jan up to 79°F in Jul, a 45.4°F seasonal swing, one of the widest gaps in this dataset.
Troy, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 43°F | 24°F | 2.56in | 3.4in |
| Feb | 49°F | 28°F | 2.16in | 3.3in |
| Mar | 59°F | 36°F | 3.44in | 1in |
| Apr | 71°F | 46°F | 4.9in | 0in |
| May | 79°F | 56°F | 5.05in | 0in |
| Jun | 87°F | 65°F | 4.62in | 0in |
| Jul | 90°F | 68°F | 4.03in | 0in |
| Aug | 89°F | 65°F | 3.92in | 0in |
| Sep | 83°F | 57°F | 3.35in | 0in |
| Oct | 73°F | 47°F | 3.12in | 0in |
| Nov | 58°F | 37°F | 3.6in | 0.6in |
| Dec | 46°F | 28°F | 2.61in | 2.9in |
If you're timing a visit, Apr, May, Sep, and Oct are Troy's mildest stretch; if you're moving there, you should plan around Jul's heat and Jan's cold instead.
How wet Troy actually gets
Over a typical year, Troy sees about 43.36in of precipitation a year across roughly 100 days with measurable rain or snow, with 11.2in of snow a year.
Troy against the rest of the country
Out of 4876 cities scored here, Troy comes in at 4057; within IL alone it ranks 261 of 330. Population is about 11,810.
Checking the actual forecast
These figures come from Belleville Siu Rsch, IL US, the NOAA station 14.5 miles from Troy, 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