St. Marys, OH Weather & Climate Normals
What a normal year in St. Marys actually looks like
On the 30-year record NOAA keeps for St. Marys, OH, the comfort score comes out to 50/100, 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. Marys's weather actually swings
Average temperatures in St. Marys run from 27°F in Jan up to 73°F in Jul, a 46.3°F seasonal swing, one of the widest gaps in this dataset.
St. Marys, month by month
| Month | Avg high | Avg low | Precip |
|---|---|---|---|
| Jan | 34°F | 20°F | 2.23in |
| Feb | 38°F | 22°F | 1.85in |
| Mar | 48°F | 30°F | 2.55in |
| Apr | 61°F | 40°F | 3.58in |
| May | 72°F | 51°F | 3.81in |
| Jun | 81°F | 61°F | 3.95in |
| Jul | 84°F | 63°F | 3.68in |
| Aug | 82°F | 61°F | 3.5in |
| Sep | 76°F | 54°F | 2.85in |
| Oct | 64°F | 44°F | 2.69in |
| Nov | 50°F | 34°F | 2.81in |
| Dec | 39°F | 26°F | 2.27in |
If you're timing a visit, May, Jun, Jul, Aug, and Sep are St. Marys's mildest stretch; if you're moving there, you should plan around Jan's cold instead.
How wet St. Marys actually gets
St. Marys averages 35.77in of precipitation a year across roughly 139 days with measurable rain or snow; the nearest NOAA station does not record snowfall, so no snow figure is shown rather than guessed.
St. Marys against the rest of the country
Out of 4876 cities scored here, St. Marys comes in at 1870; within OH alone it ranks 100 of 254. Population is about 8,376.
Checking the actual forecast
These figures come from Lima Allen Co Ap, OH US, the NOAA station 22.2 miles from St. Marys, 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