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

Bolton Threshold Days by Year (USC00400884)

17 fixed thresholds counted per year at Bolton (USC00400884): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Bolton Thresholds

  • Bolton: days with 10 mm (0.39 in) or more of precipitation in 42 years, most in 1957 with 53.
  • Bolton: days with 25 mm (0.98 in) or more of precipitation in 42 years, most in 1964 with 22.
  • Bolton: days with 50 mm (1.97 in) or more of precipitation in 40 years, most in 1953 with 9.
  • Bolton: days with 100 mm (3.94 in) or more of precipitation in 13 years, most in 1974 with 2.
  • 17 fixed thresholds have at least one qualifying day at Bolton.
3 years with a qualifying day
Days at or above 30 C (86 F) per year at Bolton Days per year at Bolton with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 112 in 1916. 0501001501916: 1121917: 761918: 91191619171918
Days per year at Bolton with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 112 in 1916.
Days at or above 30 C (86 F) per year at Bolton
YearDaysDecade average
191611293
19177693
19189193
First to last qualifying date each year at Bolton For each year, a bar from the first to the last day at Bolton meeting 30 C (86 F). 1916: 16 March 1916 to 4 November 19161917: 18 April 1917 to 21 September 19171918: 3 April 1918 to 5 October 1918191619171918JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Bolton meeting 30 C (86 F).
First to last qualifying date each year at Bolton
YearFirst dateLast date
19161916-03-161916-11-04
19171917-04-181917-09-21
19181918-04-031918-10-05

Every Fixed Threshold

Fixed thresholds at Bolton
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3112191691
35 C (95 F): Days341191623
90 F (32.2 C): Days379191655
100 F (37.8 C): Days2519185
0 C (32 F): Ice days (max319191716
0 C (32 F): Frost days (min3100191670
-10 C (14 F): Days with min321191712
-20 C (-4 F): Days with min1219182
20 C (68 F): Tropical nights (min377191656
25 C (77 F): Days with min1219182
10 mm (0.39 in): Days with 10 mm or more rain4253195744
25 mm (0.98 in): Days with 25 mm or more rain4222196418
50 mm (1.97 in): Days with 50 mm or more rain40919538
100 mm (3.94 in): Days with 100 mm or more rain13219741
200 mm (7.87 in): Days with 200 mm or more rain2119871
10 cm (3.9 in): Days with 10 cm or more snowfall4319681
25 cm (9.8 in): Days with 25 cm or more snowfall2119631

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1916.

Download the Data

  • Data for Bolton 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).