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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Dunnville Threshold Days by Year (CA006132144)

12 fixed thresholds counted per year at Dunnville (CA006132144): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Dunnville Thresholds

  • Dunnville: days with 10 mm (0.39 in) or more of precipitation in 8 years, most in 1961 with 32.
  • Dunnville: days with 25 mm (0.98 in) or more of precipitation in 8 years, most in 1900 with 6.
  • Dunnville: days with 10 cm (3.9 in) or more of snowfall in 7 years, most in 1900 with 7.
  • Dunnville: days with a maximum temperature at or below 0 C (32 F) in 3 years, most in 1900 with 56.
  • 12 fixed thresholds have at least one qualifying day at Dunnville.
3 years with a qualifying day
Nights at or below 0 C (32 F) per year at Dunnville Days per year at Dunnville with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 142 in 1901. 0501001501900: 1311901: 1421902: 135190019011902
Days per year at Dunnville with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 142 in 1901.
Nights at or below 0 C (32 F) per year at Dunnville
YearDaysDecade average
1900131136
1901142136
1902135136
First to last qualifying date each year at Dunnville For each year, a bar from the first to the last day at Dunnville meeting 0 C (32 F). 1900: 1 January 1900 to 29 December 19001901: 18 January 1901 to 31 December 19011902: 1 January 1902 to 31 December 1902190019011902JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Dunnville meeting 0 C (32 F).
First to last qualifying date each year at Dunnville
YearFirst dateLast date
19001900-01-011900-12-29
19011901-01-181901-12-31
19021902-01-011902-12-31

Every Fixed Threshold

Fixed thresholds at Dunnville
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days213190113
90 F (32.2 C): Days1219012
0 C (32 F): Ice days (max356190056
0 C (32 F): Frost days (min31421901135
-10 C (14 F): Days with min347190247
-20 C (-4 F): Days with min2319013
20 C (68 F): Tropical nights (min31919003
10 mm (0.39 in): Days with 10 mm or more rain832196132
25 mm (0.98 in): Days with 25 mm or more rain8619004
50 mm (1.97 in): Days with 50 mm or more rain2119011
10 cm (3.9 in): Days with 10 cm or more snowfall7719003
25 cm (9.8 in): Days with 25 cm or more snowfall1119001

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1900.

Download the Data

  • Data for Dunnville 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 (2025-12-31).