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Built 2026-10-19 (19 October 2026)

Cornish Threshold Days by Year (USC00171670)

14 fixed thresholds counted per year at Cornish (USC00171670): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Cornish Thresholds

  • Cornish: days with 10 mm (0.39 in) or more of precipitation in 24 years, most in 1901 with 49.
  • Cornish: days with 25 mm (0.98 in) or more of precipitation in 24 years, most in 1902 with 21.
  • Cornish: days with 50 mm (1.97 in) or more of precipitation in 23 years, most in 1901 with 5.
  • Cornish: days with a maximum temperature at or above 30 C (86 F) in 22 years, most in 1911 with 38.
  • 14 fixed thresholds have at least one qualifying day at Cornish.
22 years with a qualifying day
Days at or above 30 C (86 F) per year at Cornish Days per year at Cornish with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 38 in 1911. 0102030401901: 221902: 81903: 81904: 131905: 151906: 211907: 161908: 361909: 191910: 211911: 381912: 271913: 381914: 281915: 161916: 251917: 251919: 171920: 151921: 281922: 181923: 1719011904190719101913191619201923
Days per year at Cornish with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 38 in 1911.
Days at or above 30 C (86 F) per year at Cornish
YearDaysDecade average
19012217.6
1902817.6
1903817.6
19041317.6
19051517.6
19062117.6
19071617.6
19083617.6
19091917.6
19102126.1
19113826.1
19122726.1
19133826.1
19142826.1
19151626.1
19162526.1
19172526.1
19191726.1
19201519.5
19212819.5
19221819.5
19231719.5
First to last qualifying date each year at Cornish For each year, a bar from the first to the last day at Cornish meeting 30 C (86 F). 1901: 22 May 1901 to 7 September 19011902: 23 May 1902 to 1 September 19021903: 18 May 1903 to 16 September 19031904: 20 June 1904 to 1 August 19041905: 15 June 1905 to 12 August 19051906: 9 June 1906 to 21 September 19061907: 18 June 1907 to 20 August 19071908: 26 May 1908 to 27 September 19081909: 22 June 1909 to 25 August 19091910: 20 June 1910 to 14 August 19101911: 29 April 1911 to 2 September 19111912: 28 May 1912 to 25 August 19121913: 25 April 1913 to 8 September 19131914: 26 May 1914 to 23 September 19141915: 14 June 1915 to 17 September 19151916: 1 July 1916 to 14 September 19161917: 14 June 1917 to 28 August 19171919: 29 May 1919 to 8 September 19191920: 27 May 1920 to 26 September 19201921: 21 May 1921 to 7 September 19211922: 5 June 1922 to 2 October 19221923: 26 May 1923 to 1 September 192319011904190719101913191619201923JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Cornish meeting 30 C (86 F).
First to last qualifying date each year at Cornish
YearFirst dateLast date
19011901-05-221901-09-07
19021902-05-231902-09-01
19031903-05-181903-09-16
19041904-06-201904-08-01
19051905-06-151905-08-12
19061906-06-091906-09-21
19071907-06-181907-08-20
19081908-05-261908-09-27
19091909-06-221909-08-25
19101910-06-201910-08-14
19111911-04-291911-09-02
19121912-05-281912-08-25
19131913-04-251913-09-08
19141914-05-261914-09-23
19151915-06-141915-09-17
19161916-07-011916-09-14
19171917-06-141917-08-28
19191919-05-291919-09-08
19201920-05-271920-09-26
19211921-05-211921-09-07
19221922-06-051922-10-02
19231923-05-261923-09-01

Every Fixed Threshold

Fixed thresholds at Cornish
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2238191117
35 C (95 F): Days13819111
90 F (32.2 C): Days222419114
100 F (37.8 C): Days3519111
0 C (32 F): Ice days (max2288190452
0 C (32 F): Frost days (min221911911167
-10 C (14 F): Days with min2292190469
-20 C (-4 F): Days with min2230191729
-30 C (-22 F): Days with min9619236
20 C (68 F): Tropical nights (min171019166
10 mm (0.39 in): Days with 10 mm or more rain2449190141
25 mm (0.98 in): Days with 25 mm or more rain2421190212
50 mm (1.97 in): Days with 50 mm or more rain23519012
100 mm (3.94 in): Days with 100 mm or more rain5219011

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1901.

Download the Data

  • Data for Cornish 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).