Ontario, OH Weather & Climate Normals
What a normal year in Ontario actually looks like
On the 30-year record NOAA keeps for Ontario, 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 Ontario's weather actually swings
Average temperatures in Ontario run from 26°F in Jan up to 72°F in Jul, a 46.4°F seasonal swing, one of the widest gaps in this dataset.
Ontario, month by month
| Month | Avg high | Avg low | Precip |
|---|---|---|---|
| Jan | 34°F | 17°F | 3.16in |
| Feb | 38°F | 19°F | 2.36in |
| Mar | 48°F | 28°F | 3.35in |
| Apr | 62°F | 38°F | 3.94in |
| May | 72°F | 49°F | 4.74in |
| Jun | 80°F | 58°F | 4.32in |
| Jul | 83°F | 61°F | 3.97in |
| Aug | 82°F | 60°F | 3.51in |
| Sep | 76°F | 53°F | 3.36in |
| Oct | 63°F | 42°F | 3.46in |
| Nov | 50°F | 32°F | 3.25in |
| Dec | 39°F | 23°F | 3.06in |
If you're timing a visit, May, Jun, Jul, Aug, and Sep are Ontario's mildest stretch; if you're moving there, you should plan around Jan's cold instead.
How wet Ontario actually gets
Ontario averages 42.48in of precipitation a year across roughly 142 days with measurable rain or snow; the nearest NOAA station does not record snowfall, so no snow figure is shown rather than guessed.
Ontario against the rest of the country
Out of 4876 cities scored here, Ontario comes in at 1931; within OH alone it ranks 107 of 254. Population is about 6,648.
Checking the actual forecast
These figures come from Mansfield 5 W, OH US, the NOAA station 0.1 miles from Ontario, 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