Climateby Month

Dayton, OH climate by month

NOAA 1991-2020 normals · 740 ft elevation

Dayton has warm and often humid summers and cold and snowy winters. Highs peak at 87°F in July and fall to 36°F in January. Wet days are spread through the year, from about 8 to 14 a month. Normal snowfall is about 25 in a year. By our comfort score the best months are April, May and October.

Warmest month
87°F
July normal high
Coldest month
20°F
January normal low
Wet days a year
129
41.6 in of precipitation
Snow a year
25.0 in
normal snowfall

How warm is Dayton?

Normal highs range from 36°F in January to 87°F in July.

20°40°60°80°100° January: normal high 36°F (2°C), low 20°F (-7°C) 36° 20° February: normal high 40°F (4°C), low 23°F (-5°C) March: normal high 51°F (11°C), low 31°F (-1°C) April: normal high 64°F (18°C), low 41°F (5°C) May: normal high 75°F (24°C), low 53°F (12°C) June: normal high 84°F (29°C), low 62°F (17°C) July: normal high 87°F (31°C), low 66°F (19°C) 87° 66° August: normal high 86°F (30°C), low 64°F (18°C) September: normal high 79°F (26°C), low 56°F (13°C) October: normal high 66°F (19°C), low 44°F (7°C) November: normal high 52°F (11°C), low 33°F (1°C) December: normal high 41°F (5°C), low 26°F (-3°C) JFMAMJJASOND

Bars run from the normal low to the normal high for each month.

How rainy is Dayton?

May has the most wet days (about 14); the year brings about 42 in of precipitation.

January: 12 wet days February: 10 wet days March: 11 wet days April: 13 wet days May: 14 wet days 14 June: 12 wet days July: 10 wet days August: 8 wet days September: 8 wet days 8 October: 9 wet days November: 10 wet days December: 11 wet days JFMAMJJASOND

Wet day: at least 0.01 in of rain or melted snow, counted from daily records 1991-2020.

How much does it snow?

Normal snowfall is 25.0 in a year, most of it in January.

January: 8.3 in of snow 8.3 February: 6.6 in of snow March: 3.9 in of snow April: 0.4 in of snow May: 0.0 in of snow 0.0 June: 0.0 in of snow July: 0.0 in of snow August: 0.0 in of snow September: 0.0 in of snow October: 0.2 in of snow November: 0.8 in of snow December: 4.8 in of snow JFMAMJJASOND

How humid is Dayton?

Muggy days peak in July, at about 15 days.

January: 0 muggy days 0 February: 0 muggy days March: 0 muggy days April: 0 muggy days May: 2 muggy days June: 9 muggy days July: 15 muggy days 15 August: 12 muggy days September: 4 muggy days October: 1 muggy days November: 0 muggy days December: 0 muggy days JFMAMJJASOND

Muggy day: daily mean dew point of 65°F or higher, from hourly observations 1991-2020 at J.m.cox Dayton International Airport, 10 mi N of the city center.

How much daylight?

Daylight ranges from about 9.4 hours in December to 14.9 hours in June.

January: 9.7 hours of daylight February: 10.7 hours of daylight March: 12.0 hours of daylight April: 13.3 hours of daylight May: 14.4 hours of daylight June: 14.9 hours of daylight 14.9 July: 14.7 hours of daylight August: 13.7 hours of daylight September: 12.4 hours of daylight October: 11.1 hours of daylight November: 10.0 hours of daylight December: 9.4 hours of daylight 9.4 JFMAMJJASOND
See all numbers
Monthly climate normals and day counts for Dayton, 1991-2020
MonthHighLowPrecip.Wet daysSnowMuggy daysDaylight
January 36°F20°F 3.2 in12 8.3 in 0 9.7 h
February 40°F23°F 2.4 in10 6.6 in 0 10.7 h
March 51°F31°F 3.5 in11 3.9 in 0 12.0 h
April 64°F41°F 4.5 in13 0.4 in 0 13.3 h
May 75°F53°F 4.4 in14 0.0 in 2 14.4 h
June 84°F62°F 4.4 in12 0.0 in 9 14.9 h
July 87°F66°F 4.0 in10 0.0 in 15 14.7 h
August 86°F64°F 3.1 in8 0.0 in 12 13.7 h
September 79°F56°F 3.0 in8 0.0 in 4 12.4 h
October 66°F44°F 3.0 in9 0.2 in 1 11.1 h
November 52°F33°F 3.0 in10 0.8 in 0 10.0 h
December 41°F26°F 3.1 in11 4.8 in 0 9.4 h

High and low: NOAA 1991-2020 normal daily high and low. Wet days: at least 0.01 in of rain or melted snow. Muggy days: daily mean dew point 65°F or higher.

Best months to visit Dayton

By our comfort score, the best months are April, May and October.

Comfort score by month (0-100) and its parts, in days per month
MonthScoreComfortableNotable rainHot or cold
Jan 291720
Feb 361515
Mar 48587
Apr 651381
May 671392
Jun 55588
Jul 493713
Aug 504611
Sep 621254
Oct 641451
Nov 46565
Dec 321616

Score = 40 × share of comfortable days + 25 × share of days without notable rain + 20 × share of days neither hot (90°F+) nor cold (high 40°F or below) + 15 × daylight. How the score works.

Frost dates in Dayton

The last spring frost typically comes around Apr 18, and the first fall frost around Oct 25, leaving 189 frost-free days in a typical year.

Frost and freeze dates for Dayton
Typical date1 year in 10
Last spring frost (32°F)Apr 18after May 5
First fall frost (32°F)Oct 25before Oct 13
Last hard freeze (28°F)Apr 6after Apr 24
First hard freeze (28°F)Nov 4before Oct 23
Frost-free season189 daysunder 168 days

"Typical" is the date with a 50% chance of a later spring frost (or earlier fall frost). Planting after the "1 year in 10" spring date gives a 90% chance of no further frost. The Old Farmer's Almanac publishes 30% dates, which fall between our typical and 1-in-10 dates.

Station: Dayton Mcd (USC00332067), NOAA 1991-2020 freeze probabilities. Frost dates for every city in Ohio.

Hottest and coldest readings, 1991-2020

The highest reading was 105°F (July 7, 2012); the lowest was -18°F (January 20, 1994, and 1 other day).

From the temperature station's daily records with NOAA quality flags removed. Not an all-time record.

Near Dayton

Similar climates elsewhere

Where the numbers come from

  • Temperature, rain and frost dates: Dayton Mcd (USC00332067), 0.3 mi N of the city center, 720 ft . NOAA normals and daily records, 1991-2020.
  • Snowfall and snow depth: Dayton Intl Airport (USW00093815), 10 mi N of the city center, 1,000 ft (260 ft higher than the city). NOAA normals and daily records, 1991-2020.
  • Humidity and wind by hour and cloud cover: Wright Patterson AFB (USW00013840), 9.1 mi NE of the city center, 823 ft (83 ft higher than the city). NOAA normals and daily records, 1991-2020.
  • Daily humidity and wind: J.m.cox Dayton International Airport (724290-93815), 10 mi N of the city center, 993 ft (253 ft higher than the city). Hourly observations, 1991-2020.

Distances from the city center (USGS). Methodology · Report an error