St. Clair, MI Weather & Climate Normals
What a normal year in St. Clair actually looks like
On the 30-year record NOAA keeps for St. Clair, MI, the comfort score comes out to 45/100, 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 St. Clair's weather actually swings
Average temperatures in St. Clair run from 25°F in Jan up to 73°F in Jul, a 47.9°F seasonal swing, one of the widest gaps in this dataset.
St. Clair, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 31°F | 20°F | 2.48in | 11.1in |
| Feb | 33°F | 21°F | 2.06in | 11.4in |
| Mar | 42°F | 28°F | 2.21in | 4.6in |
| Apr | 54°F | 38°F | 3.15in | 0.4in |
| May | 67°F | 49°F | 3.53in | 0in |
| Jun | 76°F | 59°F | 3.62in | 0in |
| Jul | 81°F | 65°F | 3.25in | 0in |
| Aug | 80°F | 64°F | 3.14in | 0in |
| Sep | 73°F | 57°F | 3.32in | 0in |
| Oct | 61°F | 46°F | 3.13in | 0in |
| Nov | 47°F | 35°F | 2.81in | 1.3in |
| Dec | 36°F | 26°F | 2.17in | 6.7in |
If you're timing a visit, May, Jun, Jul, Aug, and Sep are St. Clair's mildest stretch; if you're moving there, you should plan around Jan's cold instead.
How wet St. Clair actually gets
Over a typical year, St. Clair sees about 34.87in of precipitation a year across roughly 139 days with measurable rain or snow, with 35.5in of snow a year.
St. Clair against the rest of the country
Out of 4876 cities scored here, St. Clair comes in at 3598; within MI alone it ranks 81 of 153. Population is about 5,824.
Checking the actual forecast
These figures come from Port Huron, MI US, the NOAA station 10.9 miles from St. Clair, 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