Castle Valley Threshold Days by Year (USC00421241)

15 fixed thresholds counted per year at Castle Valley (USC00421241): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Castle Valley Thresholds

Castle Valley: days with 10 mm (0.39 in) or more of precipitation in 24 years, most in 1987 with 14.
Castle Valley: days with a maximum temperature at or above 30 C (86 F) in 21 years, most in 2000 with 111.
Castle Valley: days with a maximum temperature at or above 35 C (95 F) in 21 years, most in 2008 with 67.
Castle Valley: days with a maximum temperature at or above 90 F (32.2 C) in 21 years, most in 2000 with 89.
15 fixed thresholds have at least one qualifying day at Castle Valley.

Days at or above 30 C (86 F)

21 years with a qualifying day

Days per year at Castle Valley with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 111 in 2000.

Days at or above 30 C (86 F) per year at Castle Valley
Year	Days	Decade average
1979	107	107
1980	86	93
1981	99	93
1985	100	93
1987	78	93
1988	106	93
1989	89	93
1992	75	82.6
1993	77	82.6
1994	103	82.6
1995	77	82.6
1996	95	82.6
1997	72	82.6
1998	89	82.6
1999	73	82.6
2000	111	100
2001	106	100
2002	96	100
2003	95	100
2004	85	100
2008	107	100

For each year, a bar from the first to the last day at Castle Valley meeting 30 C (86 F).

First to last qualifying date each year at Castle Valley
Year	First date	Last date
1979	1979-05-18	1979-10-07
1980	1980-05-22	1980-10-01
1981	1981-04-30	1981-09-28
1985	1985-04-16	1985-09-13
1987	1987-05-14	1987-09-23
1988	1988-05-13	1988-09-10
1989	1989-05-06	1989-09-29
1992	1992-04-29	1992-09-24
1993	1993-05-25	1993-09-12
1994	1994-05-29	1994-09-28
1995	1995-06-12	1995-09-17
1996	1996-05-11	1996-09-10
1997	1997-05-15	1997-09-09
1998	1998-05-29	1998-09-19
1999	1999-05-23	1999-09-27
2000	2000-04-28	2000-10-03
2001	2001-05-02	2001-10-01
2002	2002-05-19	2002-09-25
2003	2003-05-23	2003-10-02
2004	2004-05-05	2004-09-19
2008	2008-05-19	2008-10-02

Every Fixed Threshold

Fixed thresholds at Castle Valley
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	21	111	2000	107
35 C (95 F): Days	21	67	2008	67
40 C (104 F): Days	7	6	2002	3
90 F (32.2 C): Days	21	89	2000	82
100 F (37.8 C): Days	19	25	2002	20
0 C (32 F): Ice days (max	20	42	1979	15
0 C (32 F): Frost days (min	21	143	1979	118
-10 C (14 F): Days with min	21	46	1979	21
-20 C (-4 F): Days with min	3	4	1979	1
20 C (68 F): Tropical nights (min	21	36	1994	29
25 C (77 F): Days with min	12	3	1994	2
10 mm (0.39 in): Days with 10 mm or more rain	24	14	1987	7
25 mm (0.98 in): Days with 25 mm or more rain	9	2	1993	3
10 cm (3.9 in): Days with 10 cm or more snowfall	16	4	1985	2
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1988	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1979.

Download the Data

Data for Castle Valley 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Castle Valley Threshold Days by Year (USC00421241)

Key Facts for Castle Valley Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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