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Built 2026-10-19 (19 October 2026)

Mason Threshold Days by Year (USC00415650)

16 fixed thresholds counted per year at Mason (USC00415650): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mason Thresholds

  • Mason: days with 10 mm (0.39 in) or more of precipitation in 62 years, most in 1944 with 29.
  • Mason: days with 25 mm (0.98 in) or more of precipitation in 62 years, most in 2007 with 18.
  • Mason: days with 50 mm (1.97 in) or more of precipitation in 48 years, most in 2007 with 7.
  • Mason: days with a maximum temperature at or above 30 C (86 F) in 40 years, most in 2025 with 211.
  • 16 fixed thresholds have at least one qualifying day at Mason.
40 years with a qualifying day
Days at or above 30 C (86 F) per year at Mason Days per year at Mason with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 211 in 2025. 01002003001957: 1261958: 1341959: 1491960: 1501964: 1331965: 1281966: 1141967: 1401968: 1201970: 1181976: 1171977: 1411978: 1421979: 1331980: 1391981: 1301982: 1411983: 1201999: 1382003: 1112005: 1252007: 1142008: 1472010: 1442011: 1842012: 1572013: 1432014: 1512015: 1462016: 1332017: 1522018: 1472019: 1482020: 1482021: 1442022: 1952023: 1682024: 1902025: 2112026: 1341957196419681978198220052011201520192023
Days per year at Mason with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 211 in 2025.
Days at or above 30 C (86 F) per year at Mason
YearDaysDecade average
1957126136.3
1958134136.3
1959149136.3
1960150130.8
1964133130.8
1965128130.8
1966114130.8
1967140130.8
1968120130.8
1970118130.2
1976117130.2
1977141130.2
1978142130.2
1979133130.2
1980139132.5
1981130132.5
1982141132.5
1983120132.5
1999138138
2003111124.3
2005125124.3
2007114124.3
2008147124.3
2010144150.5
2011184150.5
2012157150.5
2013143150.5
2014151150.5
2015146150.5
2016133150.5
2017152150.5
2018147150.5
2019148150.5
2020148170
2021144170
2022195170
2023168170
2024190170
2025211170
2026134170
First to last qualifying date each year at Mason For each year, a bar from the first to the last day at Mason meeting 30 C (86 F). 1957: 9 January 1957 to 31 October 19571958: 4 April 1958 to 9 November 19581959: 17 February 1959 to 23 October 19591960: 6 April 1960 to 27 October 19601964: 4 April 1964 to 18 October 19641965: 9 April 1965 to 27 November 19651966: 4 April 1966 to 15 October 19661967: 30 January 1967 to 12 October 19671968: 28 April 1968 to 1 November 19681970: 13 April 1970 to 8 November 19701976: 10 February 1976 to 11 October 19761977: 18 February 1977 to 1 November 19771978: 2 April 1978 to 20 October 19781979: 15 February 1979 to 28 October 19791980: 21 February 1980 to 10 November 19801981: 21 April 1981 to 19 November 19811982: 12 March 1982 to 1 November 19821983: 2 March 1983 to 18 October 19831999: 10 February 1999 to 23 October 19992003: 6 April 2003 to 24 October 20032005: 29 April 2005 to 4 December 20052007: 28 February 2007 to 15 November 20072008: 5 February 2008 to 7 October 20082010: 1 April 2010 to 22 December 20102011: 28 February 2011 to 27 October 20112012: 13 March 2012 to 26 October 20122013: 5 March 2013 to 18 November 20132014: 2 March 2014 to 28 October 20142015: 25 March 2015 to 18 October 20152016: 15 March 2016 to 3 November 20162017: 25 January 2017 to 7 November 20172018: 11 March 2018 to 7 November 20182019: 16 February 2019 to 16 December 20192020: 25 March 2020 to 26 October 20202021: 8 April 2021 to 27 December 20212022: 22 February 2022 to 8 November 20222023: 12 January 2023 to 9 November 20232024: 20 February 2024 to 31 December 20242025: 3 February 2025 to 27 December 20252026: 10 February 2026 to 24 September 202619571965197619812005201220172022JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Mason meeting 30 C (86 F).
First to last qualifying date each year at Mason
YearFirst dateLast date
19571957-01-091957-10-31
19581958-04-041958-11-09
19591959-02-171959-10-23
19601960-04-061960-10-27
19641964-04-041964-10-18
19651965-04-091965-11-27
19661966-04-041966-10-15
19671967-01-301967-10-12
19681968-04-281968-11-01
19701970-04-131970-11-08
19761976-02-101976-10-11
19771977-02-181977-11-01
19781978-04-021978-10-20
19791979-02-151979-10-28
19801980-02-211980-11-10
19811981-04-211981-11-19
19821982-03-121982-11-01
19831983-03-021983-10-18
19991999-02-101999-10-23
20032003-04-062003-10-24
20052005-04-292005-12-04
20072007-02-282007-11-15
20082008-02-052008-10-07
20102010-04-012010-12-22
20112011-02-282011-10-27
20122012-03-132012-10-26
20132013-03-052013-11-18
20142014-03-022014-10-28
20152015-03-252015-10-18
20162016-03-152016-11-03
20172017-01-252017-11-07
20182018-03-112018-11-07
20192019-02-162019-12-16
20202020-03-252020-10-26
20212021-04-082021-12-27
20222022-02-222022-11-08
20232023-01-122023-11-09
20242024-02-202024-12-31
20252025-02-032025-12-27
20262026-02-102026-09-24

Every Fixed Threshold

Fixed thresholds at Mason
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days402112025134
35 C (95 F): Days40125201175
40 C (104 F): Days256020237
90 F (32.2 C): Days401632025110
100 F (37.8 C): Days3881202325
110 F (43.3 C): Days3320233
0 C (32 F): Ice days (max30619832
0 C (32 F): Frost days (min4083196624
-10 C (14 F): Days with min22819661
20 C (68 F): Tropical nights (min40129202495
25 C (77 F): Days with min203220233
10 mm (0.39 in): Days with 10 mm or more rain622919442
25 mm (0.98 in): Days with 25 mm or more rain621820072
50 mm (1.97 in): Days with 50 mm or more rain48720071
100 mm (3.94 in): Days with 100 mm or more rain13219801
10 cm (3.9 in): Days with 10 cm or more snowfall3219662

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1957.

Download the Data

  • Data for Mason 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).