Dayton, OH

Ohio · Records since 1893–2026

⛅ 81°F Feels like 86°
Currently in Dayton
As of 2:30 PM EDT

Records for September 11

🔥 Record High

98°F

September 11, 1897

+18° from 80° normal

❄ Record Low

40°F

September 11, 1917

-18° from 58° normal
🌞 Normal high: 80°F 🌑 Normal low: 58°F 1991–2020 normals

All-Time Records — Dayton

🔥
108°F
Hottest Day Ever
Jul 22, 1901
❄
-28°F
Coldest Day Ever
Feb 13, 1899
🌧
4.16"
Wettest Day Ever
Jan 21, 1959
☃
12.4"
Most Snow in One Day
Jan 25, 2026

First & Last Dates — Dayton

How early and how late each seasonal turning point has ever arrived, across the full period of record

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Range ever recorded Normal date (1991–2020)
235 days
Longest growing season
1945
138 days
Shortest growing season
1974
187 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 98°F September 11, 1897
2 95°F September 11, 1908
3 95°F September 11, 1900
4 95°F September 11, 1895
5 94°F September 11, 2013
6 93°F September 11, 2019
7 93°F September 11, 1931
8 92°F September 11, 1952
9 92°F September 11, 1947
10 92°F September 11, 1925

Top 5 Record Lows — September 11

# Temp Date
🥶 40°F September 11, 1917
2 41°F September 11, 1995
3 41°F September 11, 1976
4 42°F September 11, 1898
5 43°F September 11, 1993
About this data — Records are sourced from the NOAA Threadex dataset via RCC ACIS, a quality-controlled record for long-term climate stations. Threadex adjusts for station relocations and observation-time changes, making records comparable across all years since 1893–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Dayton

threshold: 92°F (90th percentile of historical Jun–Aug highs)
4.4
Avg heat wave length
days (historical)
97°
Avg peak temp
during heat waves
26
Dangerous nights 2026
Overnights ≥ 70°F
2
Heat waves 2026
so far

Days ≥ 90°F Per Year

1893–2026
14
2026 so far
22
Avg/year 1970–2025
18
Avg/year (last 10 complete)
62
Most in a year (1899)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Dayton

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 6, 1936 – Jul 17, 1936 12 106°F (Jul 14) 101°F 75°F
2 Jun 29, 1897 – Jul 10, 1897 12 104°F (Jul 4) 99°F 71°F
3 Sep 5, 1897 – Sep 16, 1897 12 101°F (Sep 14) 98°F 57°F
4 Jul 20, 1901 – Jul 30, 1901 11 108°F (Jul 22) 100°F 69°F
5 Aug 9, 1988 – Aug 18, 1988 10 102°F (Aug 17) 96°F 72°F
6 Jul 13, 1895 – Jul 22, 1895 10 99°F (Jul 19) 95°F 68°F
7 Aug 26, 1953 – Sep 4, 1953 10 99°F (Sep 2) 95°F 68°F
8 Jul 21, 1940 – Jul 30, 1940 10 98°F (Jul 29) 95°F 76°F
9 Jul 18, 1934 – Jul 26, 1934 9 105°F (Jul 21) 100°F 76°F
10 Aug 4, 1900 – Aug 12, 1900 9 99°F (Aug 10) 97°F 65°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

Nights where the overnight low exceeded the 1991–2020 normal low

47
2026 total
above-normal nights
38.1
Avg / summer
1970–2020
63
Most in a summer
2025

Above-Normal Summer Nights Per Year

Average June–August Low by Decade

Overnight lows · complete decades only

Precipitation

Annual totals and trend across the full period of record · see this year's standing →

Monthly Precipitation — Last 24 Months

Blue = actual · dashed line = monthly normal

Annual Precipitation Per Year (1893–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1893, annual totals have trended +0.49" per decade, about +6.4" across the record.

Heavy Rain Days Per Year (≥ 1.0")

Compare year-to-year changes in days with heavy rainfall (≥ 1.0")

This Year — 2026

How Dayton is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

113 of 253 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

37.73"
2026 YTD
Normal: 30.04"
+7.69"
0.62"
September so far
September normal: 3.31"
-2.69"
12
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Dayton is 7.69" ahead of the normal pace

Period Review — Jun 12 – Sep 10, 2026

Any window, evaluated against every other year on record — 91 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
74.1°F
Average temperature
55th-warmest of 133
+0.7°
vs. average
Normal: 73.4°F (1991–2020)
14.60"
Precipitation
11th-wettest of 124
+3.87"
vs. average
Normal: 10.73" · 136% of normal

Average Temperature by Year — Jun 12 – Sep 10

1893–2026 · 2026 highlighted · trend -0.07° per decade (cooling since 1893)

Precipitation by Year — Jun 12 – Sep 10

1894–2026 · 2026 highlighted · trend +0.09" per decade (wetter since 1894)

Warmest Jun 12 – Sep 10 on Record

# Year Avg Temp
1 1936 78.1°F
2 1901 77.6°F
3 1900 77.1°F
4 1934 77.0°F
5 1894 76.8°F
6 1944 76.8°F
7 1921 76.5°F
8 1943 76.5°F
9 1913 76.4°F
10 1931 76.2°F

Coolest Jun 12 – Sep 10 on Record

# Year Avg Temp
1 1963 69.9°F
2 1915 70.1°F
3 1950 70.1°F
4 2004 70.2°F
5 1976 70.3°F
6 1984 70.4°F
7 2009 70.5°F
8 1958 70.8°F
9 1927 70.8°F
10 1992 70.9°F

Wettest Jun 12 – Sep 10 on Record

# Year Total
1 1995 18.12"
2 2001 16.43"
3 2017 16.43"
4 1926 16.36"
5 1896 16.27"
6 1958 15.85"
7 2003 15.56"
8 1979 14.91"
9 1915 14.80"
10 1990 14.78"

Driest Jun 12 – Sep 10 on Record

# Year Total
1 2002 3.98"
2 1903 4.69"
3 1970 4.83"
4 1940 4.94"
5 1965 4.95"
6 1964 5.42"
7 1985 5.91"
8 1953 6.11"
9 1914 6.22"
10 1944 6.28"
About this data. Pick any start and end date and this becomes the same kind of review as the Month and Fall tabs, just for exactly the window you asked for — the generalized version of the same engine, evaluated across every year on record. Average temperature is the mean of each day's (high + low) / 2; precipitation is the sum of daily totals. A year missing more than about a fifth of the window's days is excluded from the temperature ranking; any missing day excludes a year from the precipitation ranking, since an unreported day is unreported rain. Ranges that cross from December into January aren't supported yet. Normals are the 1991–2020 mean for the same window.
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