Napoleon has chilly winters and warm summers
A typical July afternoon reaches 85°, a January night drops to 18°, and about 25 inches of snow falls in a normal winter.
A year in Napoleon at a glance
Each month’s typical high and low, and what it brings.
What stands out about Napoleon’s climate
Read from where Napoleon sits among Ohio’s towns. The page puts what stands out first.
About 183 frost-free days a year
In half of years the last 32° night comes by April 23 and the first by October 24.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
25 inches of snow, 37 of rain and melt
May is the wettest month and February the driest. Rain or snow falls on about 119 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
What a year in Napoleon feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
Living with Napoleon’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
183 frost-free days. The last frost comes by Apr 23 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 24.
About 25" a winter over 9 days with an inch or more, most in January.
Months averaging under 55° run from October through April. Heating is 87% of the year’s heating-and-cooling load.
About 26 days a year reach 90°, and July afternoons average 85°.
The nicest months are May, June, August, September and October. 4.3 miles of trails are waiting.
Parks & trails →Normals are averages. Ice storms, nor’easters, floods and heat waves are on the natural hazards page.
Natural hazards →Napoleon and its neighbors
Adams has the coldest January nights next door (18°) and Liberty the hottest July afternoons (85°). Tap a town to see its climate.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Napoleon averaged 1.3° warmer than the 1900s. The biggest change is in December (+2.4°).
A bigger shift than in 55% of U.S. towns.
Change by month
How Napoleon compares
Against every U.S. town on TownTapestry, each counted once, with its place in Ohio.
Napoleon 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 | 30-yr range |
|---|---|---|---|---|---|---|
| January | 33° | 18° | 2.3" | 9.5" | 11 | 16° – 37° |
| February | 36° | 21° | 2.0" | 6.0" | 9 | 14° – 38° |
| March | 47° | 29° | 2.5" | 4.3" | 10 | 29° – 52° |
| April | 61° | 39° | 3.4" | 0 | 12 | 43° – 55° |
| May | 72° | 49° | 4.1" | 0 | 11 | 53° – 67° |
| June | 81° | 59° | 3.9" | 0 | 10 | 65° – 74° |
| July | 85° | 63° | 3.8" | 0 | 10 | 68° – 80° |
| August | 82° | 61° | 3.6" | 0 | 8 | 67° – 77° |
| September | 76° | 53° | 2.9" | 0 | 8 | 61° – 69° |
| October | 64° | 43° | 2.7" | 0 | 9 | 49° – 60° |
| November | 49° | 33° | 2.8" | 0.4" | 10 | 34° – 47° |
| December | 38° | 24° | 2.5" | 4.5" | 10 | 18° – 41° |
| Year | 60° | 41° | 36.5" | 24.7" | 119 |
Heating and cooling a home in Napoleon
87% of the work is heating, so the furnace matters far more than the air conditioner.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. Source: NOAA station normals.
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 14° to 38°. September is the most reliable, staying within 9°.
Common questions about Napoleon’s climate
What is the coldest month in Napoleon?
January, with a typical high of 33° and a low of 18°.
What is the hottest month in Napoleon?
July, with a typical high of 85° and a low of 63°. About 26 days a year reach 90°.
How much snow does Napoleon get?
About 25 inches in a normal winter, most of it in January.
When is the first frost in Napoleon?
In half of years the first 32° night comes by October 24, and the last spring frost by April 23.
What is the rainiest month in Napoleon?
May, with 4.1 inches of rain and melted snow. The year totals 37 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Napoleon.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Napoleon itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Napoleon, OH (3 mi, snow) and Napoleon 1sw, OH (1 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. Today’s forecast: National Weather Service.