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Built 2026-10-19 (19 October 2026)

Bright Angel Rs Threshold Days by Year (USC00021001)

15 fixed thresholds counted per year at Bright Angel Rs (USC00021001): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Bright Angel Rs Thresholds

  • Bright Angel Rs: days with 10 mm (0.39 in) or more of precipitation in 60 years, most in 1978 with 35.
  • Bright Angel Rs: days with 25 mm (0.98 in) or more of precipitation in 60 years, most in 1978 with 14.
  • Bright Angel Rs: nights with a minimum temperature at or below 0 C (32 F) in 53 years, most in 1976 with 232.
  • Bright Angel Rs: nights with a minimum temperature at or below -10 C (14 F) in 52 years, most in 1979 with 71.
  • 15 fixed thresholds have at least one qualifying day at Bright Angel Rs.
36 years with a qualifying day
Days at or above 30 C (86 F) per year at Bright Angel Rs Days per year at Bright Angel Rs with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 16 in 2020. 051015201938: 51939: 91940: 61942: 11944: 11947: 21948: 21949: 11950: 31953: 11954: 31956: 51974: 21977: 11979: 11985: 51989: 61990: 41993: 21994: 71995: 51996: 71997: 21998: 51999: 32003: 132010: 42013: 22014: 22015: 52017: 82018: 62020: 162022: 32024: 102026: 14193819441950197419891995199920142020
Days per year at Bright Angel Rs with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 16 in 2020.
Days at or above 30 C (86 F) per year at Bright Angel Rs
YearDaysDecade average
193857
193997
194062.2
194212.2
194412.2
194722.2
194822.2
194912.2
195033
195313
195433
195653
197421.3
197711.3
197911.3
198555.5
198965.5
199044.4
199324.4
199474.4
199554.4
199674.4
199724.4
199854.4
199934.4
20031313
201044.5
201324.5
201424.5
201554.5
201784.5
201864.5
20201610.8
2022310.8
20241010.8
20261410.8
First to last qualifying date each year at Bright Angel Rs For each year, a bar from the first to the last day at Bright Angel Rs meeting 30 C (86 F). 1938: 30 July 1938 to 4 August 19381939: 8 July 1939 to 16 August 19391940: 16 June 1940 to 11 August 19401942: 6 July 1942 to 6 July 19421944: 13 August 1944 to 13 August 19441947: 1 July 1947 to 28 July 19471948: 16 July 1948 to 18 July 19481949: 15 July 1949 to 15 July 19491950: 28 June 1950 to 4 September 19501953: 7 July 1953 to 7 July 19531954: 19 July 1954 to 2 August 19541956: 27 June 1956 to 9 August 19561974: 13 June 1974 to 28 June 19741977: 1 August 1977 to 1 August 19771979: 3 August 1979 to 3 August 19791985: 5 July 1985 to 9 July 19851989: 4 July 1989 to 19 July 19891990: 25 June 1990 to 1 July 19901993: 8 July 1993 to 2 August 19931994: 25 June 1994 to 7 August 19941995: 28 July 1995 to 31 August 19951996: 2 July 1996 to 25 July 19961997: 15 July 1997 to 16 July 19971998: 15 July 1998 to 19 July 19981999: 30 June 1999 to 2 July 19992003: 5 July 2003 to 22 July 20032010: 15 July 2010 to 20 July 20102013: 28 June 2013 to 29 June 20132014: 23 July 2014 to 26 July 20142015: 26 June 2015 to 1 July 20152017: 19 June 2017 to 7 July 20172018: 21 June 2018 to 8 August 20182020: 11 July 2020 to 6 September 20202022: 9 July 2022 to 22 July 20222024: 4 July 2024 to 1 August 20242026: 7 July 2026 to 26 August 202619381947195419851995200320172026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Bright Angel Rs meeting 30 C (86 F).
First to last qualifying date each year at Bright Angel Rs
YearFirst dateLast date
19381938-07-301938-08-04
19391939-07-081939-08-16
19401940-06-161940-08-11
19421942-07-061942-07-06
19441944-08-131944-08-13
19471947-07-011947-07-28
19481948-07-161948-07-18
19491949-07-151949-07-15
19501950-06-281950-09-04
19531953-07-071953-07-07
19541954-07-191954-08-02
19561956-06-271956-08-09
19741974-06-131974-06-28
19771977-08-011977-08-01
19791979-08-031979-08-03
19851985-07-051985-07-09
19891989-07-041989-07-19
19901990-06-251990-07-01
19931993-07-081993-08-02
19941994-06-251994-08-07
19951995-07-281995-08-31
19961996-07-021996-07-25
19971997-07-151997-07-16
19981998-07-151998-07-19
19991999-06-301999-07-02
20032003-07-052003-07-22
20102010-07-152010-07-20
20132013-06-282013-06-29
20142014-07-232014-07-26
20152015-06-262015-07-01
20172017-06-192017-07-07
20182018-06-212018-08-08
20202020-07-112020-09-06
20222022-07-092022-07-22
20242024-07-042024-08-01
20262026-07-072026-08-26

Every Fixed Threshold

Fixed thresholds at Bright Angel Rs
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3616202014
90 F (32.2 C): Days7620036
0 C (32 F): Ice days (max5155194928
0 C (32 F): Frost days (min5323219761
-10 C (14 F): Days with min5271197925
-20 C (-4 F): Days with min251019394
-30 C (-22 F): Days with min2119781
20 C (68 F): Tropical nights (min1219392
10 mm (0.39 in): Days with 10 mm or more rain603519788
25 mm (0.98 in): Days with 25 mm or more rain601419786
50 mm (1.97 in): Days with 50 mm or more rain28420101
100 mm (3.94 in): Days with 100 mm or more rain4219511
10 cm (3.9 in): Days with 10 cm or more snowfall5127197812
25 cm (9.8 in): Days with 25 cm or more snowfall47519492
50 cm (19.7 in): Days with 50 cm or more snowfall4119541

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1938.

Download the Data

  • Data for Bright Angel Rs 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).