Mount Vernon, OH climate
Mount Vernon has chilly, snowy winters and pleasant summers. A typical July afternoon reaches 84°, a January night drops to 19°, and about 42 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Mount Vernon feels like
Winter
Spring
Summer
Fall
Mount Vernon weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 35° | 19° | 3.0" | 12.9" | 14 | 16 | 18° – 38° |
| February | 39° | 21° | 2.4" | 10.6" | 12 | 12 | 16° – 39° |
| March | 49° | 29° | 3.3" | 6.5" | 12 | 5 | 33° – 51° |
| April | 62° | 39° | 3.9" | 1.2" | 14 | 1 | 44° – 56° |
| May | 72° | 49° | 4.2" | 0 | 14 | 0 | 53° – 67° |
| June | 81° | 58° | 4.6" | 0 | 12 | 0 | 64° – 72° |
| July | 84° | 61° | 4.1" | 0 | 11 | 0 | 67° – 76° |
| August | 82° | 59° | 3.5" | 0 | 10 | 0 | 66° – 76° |
| September | 76° | 52° | 3.3" | 0 | 10 | 0 | 61° – 68° |
| October | 64° | 41° | 2.9" | 0 | 11 | 0 | 49° – 59° |
| November | 51° | 32° | 2.9" | 2.3" | 11 | 2 | 35° – 47° |
| December | 40° | 25° | 3.0" | 8.1" | 14 | 9 | 20° – 43° |
| Year | 61° | 40° | 41.0" | 41.6" | 144 | 44 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Mount Vernon
Mount Vernon gets 41 inches of rain and melted snow a year. June is the wettest month and February the driest. Rain or snow falls on about 144 days a year. Snow covers the ground about 44 days of the year.
About 172 frost-free days a year
In half of years the last 32° night comes by April 27 and the first one by October 17. That leaves about 172 frost-free days for gardens, shorter than 58% of U.S. towns.
Heating and cooling a home in Mount Vernon
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Mount Vernon, 90% of that work is heating and 10% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Mount Vernon and its neighbors
Mount Vernon borders 6 towns with climate data. January nights across them vary by 0.5°. Monroe has the coldest January nights (19°) and Clinton the hottest July afternoons (83°). Mount Vernon’s January low is 19° and its July high 84°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Mount Vernon compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Mount Vernon averaged 1.1° warmer than the 1900s. The biggest change is in December (+2.6°). The shift is smaller than in 57% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Mount Vernon’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 16° to 39°. September is the most reliable, staying within 7°.
Common questions about Mount Vernon’s climate
What is the coldest month in Mount Vernon?
January, with a typical high of 35° and a low of 19°.
What is the hottest month in Mount Vernon?
July, with a typical high of 84° and a low of 61°. About 9 days a year reach 90°.
How much snow does Mount Vernon get?
About 42 inches in a normal winter, most of it in January.
When is the first frost in Mount Vernon?
In half of years the first 32° night comes by October 17, and the last spring frost by April 27.
What is the rainiest month in Mount Vernon?
June, with 4.6 inches of rain and melted snow. The year totals 41 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Mount Vernon itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Danville 2 W, OH (10 mi, snow) and Centerburg 2 Se, OH (11 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.