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Built 2026-10-19 (19 October 2026)

Boswell Threshold Days by Year (CA001140905)

13 fixed thresholds counted per year at Boswell (CA001140905): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Boswell Thresholds

  • Boswell: days with a maximum temperature at or above 30 C (86 F) in 22 years, most in 1936 with 31.
  • Boswell: days with a maximum temperature at or below 0 C (32 F) in 22 years, most in 1916 with 62.
  • Boswell: days with 10 mm (0.39 in) or more of precipitation in 22 years, most in 1915 with 25.
  • Boswell: days with 10 cm (3.9 in) or more of snowfall in 22 years, most in 1916 with 11.
  • 13 fixed thresholds have at least one qualifying day at Boswell.
22 years with a qualifying day
Days at or above 30 C (86 F) per year at Boswell Days per year at Boswell with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 31 in 1936. 0102030401914: 191915: 141916: 41919: 91920: 71921: 201922: 91923: 151924: 131925: 191926: 121927: 31928: 221929: 131930: 231931: 241932: 121933: 231934: 141935: 141936: 311937: 1919141919192219251928193119341937
Days per year at Boswell with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 31 in 1936.
Days at or above 30 C (86 F) per year at Boswell
YearDaysDecade average
19141911.5
19151411.5
1916411.5
1919911.5
1920713.3
19212013.3
1922913.3
19231513.3
19241313.3
19251913.3
19261213.3
1927313.3
19282213.3
19291313.3
19302320
19312420
19321220
19332320
19341420
19351420
19363120
19371920
First to last qualifying date each year at Boswell For each year, a bar from the first to the last day at Boswell meeting 30 C (86 F). 1914: 17 June 1914 to 15 August 19141915: 1 August 1915 to 5 September 19151916: 17 June 1916 to 14 August 19161919: 19 June 1919 to 18 August 19191920: 3 July 1920 to 28 July 19201921: 8 July 1921 to 30 August 19211922: 26 June 1922 to 25 August 19221923: 14 July 1923 to 31 August 19231924: 17 May 1924 to 27 August 19241925: 20 June 1925 to 21 August 19251926: 6 June 1926 to 13 July 19261927: 22 July 1927 to 24 July 19271928: 11 July 1928 to 20 August 19281929: 1 July 1929 to 31 August 19291930: 4 July 1930 to 14 August 19301931: 8 June 1931 to 3 September 19311932: 28 June 1932 to 27 August 19321933: 15 June 1933 to 17 August 19331934: 24 May 1934 to 2 September 19341935: 24 May 1935 to 10 September 19351936: 28 May 1936 to 30 August 19361937: 2 June 1937 to 16 September 193719141919192219251928193119341937JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Boswell meeting 30 C (86 F).
First to last qualifying date each year at Boswell
YearFirst dateLast date
19141914-06-171914-08-15
19151915-08-011915-09-05
19161916-06-171916-08-14
19191919-06-191919-08-18
19201920-07-031920-07-28
19211921-07-081921-08-30
19221922-06-261922-08-25
19231923-07-141923-08-31
19241924-05-171924-08-27
19251925-06-201925-08-21
19261926-06-061926-07-13
19271927-07-221927-07-24
19281928-07-111928-08-20
19291929-07-011929-08-31
19301930-07-041930-08-14
19311931-06-081931-09-03
19321932-06-281932-08-27
19331933-06-151933-08-17
19341934-05-241934-09-02
19351935-05-241935-09-10
19361936-05-281936-08-30
19371937-06-021937-09-16

Every Fixed Threshold

Fixed thresholds at Boswell
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2231193619
35 C (95 F): Days10519281
90 F (32.2 C): Days181419364
100 F (37.8 C): Days1119361
0 C (32 F): Ice days (max2262191647
0 C (32 F): Frost days (min201591927143
-10 C (14 F): Days with min1936191635
-20 C (-4 F): Days with min8519245
20 C (68 F): Tropical nights (min3419332
10 mm (0.39 in): Days with 10 mm or more rain2225191518
25 mm (0.98 in): Days with 25 mm or more rain16219161
10 cm (3.9 in): Days with 10 cm or more snowfall221119167
25 cm (9.8 in): Days with 25 cm or more snowfall8219221

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1914.

Download the Data

  • Data for Boswell 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 (2026-10-17).