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Data as of 2026-10-12
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Built 2026-10-19 (19 October 2026)

Dayton Threshold Days by Year (USC00482399)

17 fixed thresholds counted per year at Dayton (USC00482399): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Dayton Thresholds

  • Dayton: days with 10 mm (0.39 in) or more of precipitation in 31 years, most in 2023 with 19.
  • Dayton: days with 10 cm (3.9 in) or more of snowfall in 28 years, most in 2009 with 10.
  • Dayton: days with 25 mm (0.98 in) or more of precipitation in 24 years, most in 1952 with 5.
  • Dayton: days with a maximum temperature at or above 30 C (86 F) in 19 years, most in 2020 with 69.
  • 17 fixed thresholds have at least one qualifying day at Dayton.
19 years with a qualifying day
Days at or above 30 C (86 F) per year at Dayton Days per year at Dayton with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 69 in 2020. 0204060802007: 552008: 272009: 332010: 332011: 512012: 602013: 472014: 382015: 442016: 422017: 462018: 302019: 382020: 692021: 642022: 672023: 462025: 642026: 522007200920112013201520172019202120232026
Days per year at Dayton with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 69 in 2020.
Days at or above 30 C (86 F) per year at Dayton
YearDaysDecade average
20075538.3
20082738.3
20093338.3
20103342.9
20115142.9
20126042.9
20134742.9
20143842.9
20154442.9
20164242.9
20174642.9
20183042.9
20193842.9
20206960.3
20216460.3
20226760.3
20234660.3
20256460.3
20265260.3
First to last qualifying date each year at Dayton For each year, a bar from the first to the last day at Dayton meeting 30 C (86 F). 2007: 22 June 2007 to 22 September 20072008: 30 June 2008 to 25 September 20082009: 19 May 2009 to 26 September 20092010: 28 June 2010 to 4 October 20102011: 7 June 2011 to 3 October 20112012: 5 June 2012 to 16 September 20122013: 13 May 2013 to 8 September 20132014: 29 May 2014 to 26 September 20142015: 9 June 2015 to 11 October 20152016: 8 June 2016 to 3 September 20162017: 13 May 2017 to 13 September 20172018: 5 June 2018 to 9 September 20182019: 7 June 2019 to 17 September 20192020: 30 May 2020 to 10 October 20202021: 4 June 2021 to 6 October 20212022: 17 June 2022 to 29 September 20222023: 23 May 2023 to 19 September 20232025: 5 May 2025 to 28 September 20252026: 13 May 2026 to 11 September 20262007201020132016201920222026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Dayton meeting 30 C (86 F).
First to last qualifying date each year at Dayton
YearFirst dateLast date
20072007-06-222007-09-22
20082008-06-302008-09-25
20092009-05-192009-09-26
20102010-06-282010-10-04
20112011-06-072011-10-03
20122012-06-052012-09-16
20132013-05-132013-09-08
20142014-05-292014-09-26
20152015-06-092015-10-11
20162016-06-082016-09-03
20172017-05-132017-09-13
20182018-06-052018-09-09
20192019-06-072019-09-17
20202020-05-302020-10-10
20212021-06-042021-10-06
20222022-06-172022-09-29
20232023-05-232023-09-19
20252025-05-052025-09-28
20262026-05-132026-09-11

Every Fixed Threshold

Fixed thresholds at Dayton
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days1969202052
35 C (95 F): Days1819202118
40 C (104 F): Days2220211
90 F (32.2 C): Days1949202135
100 F (37.8 C): Days10620214
0 C (32 F): Ice days (max1955201910
0 C (32 F): Frost days (min172142022105
-10 C (14 F): Days with min17108201822
-20 C (-4 F): Days with min173720197
-30 C (-22 F): Days with min10620184
20 C (68 F): Tropical nights (min2220071
10 mm (0.39 in): Days with 10 mm or more rain311920235
25 mm (0.98 in): Days with 25 mm or more rain24519523
50 mm (1.97 in): Days with 50 mm or more rain5219971
100 mm (3.94 in): Days with 100 mm or more rain1120001
10 cm (3.9 in): Days with 10 cm or more snowfall281020092
25 cm (9.8 in): Days with 25 cm or more snowfall9220201

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2007.

Download the Data

  • Data for Dayton threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2026-10-12).