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Built 2026-10-19 (19 October 2026)

Big Delta AP Threshold Days by Year (USW00026415)

14 fixed thresholds counted per year at Big Delta AP (USW00026415): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Big Delta AP Thresholds

  • Big Delta AP: nights with a minimum temperature at or below 0 C (32 F) in 82 years, most in 1948 with 248.
  • Big Delta AP: nights with a minimum temperature at or below -10 C (14 F) in 82 years, most in 1972 with 180.
  • Big Delta AP: nights with a minimum temperature at or below -20 C (-4 F) in 82 years, most in 1956 with 111.
  • Big Delta AP: nights with a minimum temperature at or below -30 C (-22 F) in 82 years, most in 1956 with 71.
  • 14 fixed thresholds have at least one qualifying day at Big Delta AP.
29 years with a qualifying day
Days at or above 30 C (86 F) per year at Big Delta AP Days per year at Big Delta AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 5 in 1994. 02461942: 11947: 31948: 21950: 11951: 11953: 21955: 11957: 11958: 31960: 21967: 21969: 41972: 11975: 11976: 11977: 31980: 11983: 11994: 52004: 32009: 22010: 12013: 22015: 12017: 12018: 12019: 12023: 22024: 11942195019551960197219771994201020172023
Days per year at Big Delta AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 5 in 1994.
Days at or above 30 C (86 F) per year at Big Delta AP
YearDaysDecade average
194212
194732
194822
195011.5
195111.5
195321.5
195511.5
195711.5
195831.5
196022.7
196722.7
196942.7
197211.5
197511.5
197611.5
197731.5
198011
198311
199455
200432.5
200922.5
201011.2
201321.2
201511.2
201711.2
201811.2
201911.2
202321.5
202411.5
First to last qualifying date each year at Big Delta AP For each year, a bar from the first to the last day at Big Delta AP meeting 30 C (86 F). 1942: 24 June 1942 to 24 June 19421947: 28 May 1947 to 16 July 19471948: 17 June 1948 to 18 June 19481950: 18 June 1950 to 18 June 19501951: 16 July 1951 to 16 July 19511953: 27 July 1953 to 30 July 19531955: 25 July 1955 to 25 July 19551957: 12 July 1957 to 12 July 19571958: 1 June 1958 to 4 July 19581960: 24 May 1960 to 12 August 19601967: 18 June 1967 to 20 June 19671969: 14 June 1969 to 20 June 19691972: 14 June 1972 to 14 June 19721975: 10 July 1975 to 10 July 19751976: 1 August 1976 to 1 August 19761977: 30 July 1977 to 21 August 19771980: 11 August 1980 to 11 August 19801983: 25 June 1983 to 25 June 19831994: 1 August 1994 to 7 August 19942004: 19 June 2004 to 24 June 20042009: 8 July 2009 to 13 July 20092010: 15 August 2010 to 15 August 20102013: 25 June 2013 to 26 June 20132015: 6 July 2015 to 6 July 20152017: 9 June 2017 to 9 June 20172018: 22 July 2018 to 22 July 20182019: 29 June 2019 to 29 June 20192023: 23 July 2023 to 24 July 20232024: 24 July 2024 to 24 July 202419421951195819721980200920172024JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Big Delta AP meeting 30 C (86 F).
First to last qualifying date each year at Big Delta AP
YearFirst dateLast date
19421942-06-241942-06-24
19471947-05-281947-07-16
19481948-06-171948-06-18
19501950-06-181950-06-18
19511951-07-161951-07-16
19531953-07-271953-07-30
19551955-07-251955-07-25
19571957-07-121957-07-12
19581958-06-011958-07-04
19601960-05-241960-08-12
19671967-06-181967-06-20
19691969-06-141969-06-20
19721972-06-141972-06-14
19751975-07-101975-07-10
19761976-08-011976-08-01
19771977-07-301977-08-21
19801980-08-111980-08-11
19831983-06-251983-06-25
19941994-08-011994-08-07
20042004-06-192004-06-24
20092009-07-082009-07-13
20102010-08-152010-08-15
20132013-06-252013-06-26
20152015-07-062015-07-06
20172017-06-092017-06-09
20182018-07-222018-07-22
20192019-06-292019-06-29
20232023-07-232023-07-24
20242024-07-242024-07-24

Every Fixed Threshold

Fixed thresholds at Big Delta AP
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days29519941
90 F (32.2 C): Days6219472
0 C (32 F): Ice days (max81180197295
0 C (32 F): Frost days (min822481948132
-10 C (14 F): Days with min82180197293
-20 C (-4 F): Days with min82111195659
-30 C (-22 F): Days with min8271195631
-40 C (-40 F): Days with min702619719
20 C (68 F): Tropical nights (min3220242
10 mm (0.39 in): Days with 10 mm or more rain791319849
25 mm (0.98 in): Days with 25 mm or more rain39419841
50 mm (1.97 in): Days with 50 mm or more rain4119431
10 cm (3.9 in): Days with 10 cm or more snowfall32619671
25 cm (9.8 in): Days with 25 cm or more snowfall3119651

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1942.

Download the Data

  • Data for Big Delta AP 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).