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

Arnold Threshold Days by Year (USC00250355)

18 fixed thresholds counted per year at Arnold (USC00250355): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Arnold Thresholds

  • Arnold: days with 10 mm (0.39 in) or more of precipitation in 59 years, most in 1965 with 26.
  • Arnold: days with 25 mm (0.98 in) or more of precipitation in 58 years, most in 1973 with 11.
  • Arnold: days with 10 cm (3.9 in) or more of snowfall in 42 years, most in 1990 with 5.
  • Arnold: days with 50 mm (1.97 in) or more of precipitation in 35 years, most in 1956 with 3.
  • 18 fixed thresholds have at least one qualifying day at Arnold.
22 years with a qualifying day
Days at or above 30 C (86 F) per year at Arnold Days per year at Arnold with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 77 in 2000. 0204060801987: 721988: 751989: 491990: 681991: 651992: 271993: 281994: 591995: 611996: 341997: 532000: 772001: 572002: 652005: 612006: 662007: 402010: 422015: 402023: 642024: 692025: 7519871990199319962001200620152025
Days per year at Arnold with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 77 in 2000.
Days at or above 30 C (86 F) per year at Arnold
YearDaysDecade average
19877265.3
19887565.3
19894965.3
19906849.4
19916549.4
19922749.4
19932849.4
19945949.4
19956149.4
19963449.4
19975349.4
20007761
20015761
20026561
20056161
20066661
20074061
20104241
20154041
20236469.3
20246969.3
20257569.3
First to last qualifying date each year at Arnold For each year, a bar from the first to the last day at Arnold meeting 30 C (86 F). 1987: 17 April 1987 to 4 October 19871988: 7 April 1988 to 26 September 19881989: 20 April 1989 to 13 October 19891990: 22 April 1990 to 29 October 19901991: 5 April 1991 to 8 October 19911992: 30 April 1992 to 3 October 19921993: 16 June 1993 to 6 October 19931994: 17 April 1994 to 29 September 19941995: 6 June 1995 to 11 October 19951996: 2 April 1996 to 12 October 19961997: 16 May 1997 to 2 October 19972000: 23 May 2000 to 1 October 20002001: 14 May 2001 to 28 October 20012002: 16 April 2002 to 9 September 20022005: 20 May 2005 to 19 October 20052006: 14 April 2006 to 7 October 20062007: 29 April 2007 to 20 October 20072010: 23 May 2010 to 9 October 20102015: 17 March 2015 to 12 October 20152023: 13 April 2023 to 3 October 20232024: 14 April 2024 to 11 October 20242025: 29 March 2025 to 12 October 202519871990199319962001200620152025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Arnold meeting 30 C (86 F).
First to last qualifying date each year at Arnold
YearFirst dateLast date
19871987-04-171987-10-04
19881988-04-071988-09-26
19891989-04-201989-10-13
19901990-04-221990-10-29
19911991-04-051991-10-08
19921992-04-301992-10-03
19931993-06-161993-10-06
19941994-04-171994-09-29
19951995-06-061995-10-11
19961996-04-021996-10-12
19971997-05-161997-10-02
20002000-05-232000-10-01
20012001-05-142001-10-28
20022002-04-162002-09-09
20052005-05-202005-10-19
20062006-04-142006-10-07
20072007-04-292007-10-20
20102010-05-232010-10-09
20152015-03-172015-10-12
20232023-04-132023-10-03
20242024-04-142024-10-11
20252025-03-292025-10-12

Every Fixed Threshold

Fixed thresholds at Arnold
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2277200075
35 C (95 F): Days2026200012
40 C (104 F): Days5319901
90 F (32.2 C): Days2263200039
100 F (37.8 C): Days15820022
0 C (32 F): Ice days (max2256199325
0 C (32 F): Frost days (min20175199195
-10 C (14 F): Days with min2068199338
-20 C (-4 F): Days with min2022198915
-30 C (-22 F): Days with min5419892
20 C (68 F): Tropical nights (min1913202324
25 C (77 F): Days with min10n/a1
10 mm (0.39 in): Days with 10 mm or more rain5926196516
25 mm (0.98 in): Days with 25 mm or more rain581119736
50 mm (1.97 in): Days with 50 mm or more rain35319561
100 mm (3.94 in): Days with 100 mm or more rain1119511
10 cm (3.9 in): Days with 10 cm or more snowfall42519902
25 cm (9.8 in): Days with 25 cm or more snowfall9119491

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1987.

Download the Data

  • Data for Arnold 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).