Red Rock Threshold Days by Year (USC00417497)

16 fixed thresholds counted per year at Red Rock (USC00417497): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Red Rock Thresholds

Red Rock: days with 10 mm (0.39 in) or more of precipitation in 32 years, most in 1976 with 44.
Red Rock: days with 25 mm (0.98 in) or more of precipitation in 32 years, most in 1976 with 21.
Red Rock: days with a maximum temperature at or above 30 C (86 F) in 30 years, most in 1989 with 173.
Red Rock: days with a maximum temperature at or above 35 C (95 F) in 30 years, most in 1998 with 92.
16 fixed thresholds have at least one qualifying day at Red Rock.

Days at or above 30 C (86 F)

30 years with a qualifying day

Days per year at Red Rock with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 173 in 1989.

Days at or above 30 C (86 F) per year at Red Rock
Year	Days	Decade average
1966	126	136.3
1967	158	136.3
1968	122	136.3
1969	139	136.3
1970	122	138.9
1971	141	138.9
1972	155	138.9
1973	137	138.9
1974	138	138.9
1975	136	138.9
1976	122	138.9
1977	151	138.9
1978	148	138.9
1980	150	146
1981	127	146
1982	127	146
1983	122	146
1984	151	146
1985	131	146
1986	148	146
1987	160	146
1988	171	146
1989	173	146
1990	156	144
1991	155	144
1992	136	144
1993	130	144
1994	134	144
1997	140	144
1998	157	144

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

First to last qualifying date each year at Red Rock
Year	First date	Last date
1966	1966-04-04	1966-10-15
1967	1967-03-11	1967-11-22
1968	1968-04-29	1968-10-17
1969	1969-05-08	1969-11-09
1970	1970-04-13	1970-10-27
1971	1971-03-14	1971-10-19
1972	1972-03-18	1972-11-01
1973	1973-04-20	1973-11-09
1974	1974-03-12	1974-10-30
1975	1975-01-27	1975-11-10
1976	1976-03-21	1976-10-11
1977	1977-02-26	1977-11-01
1978	1978-03-01	1978-11-03
1980	1980-02-20	1980-11-10
1981	1981-04-14	1981-10-15
1982	1982-03-31	1982-11-01
1983	1983-05-03	1983-11-23
1984	1984-03-28	1984-10-19
1985	1985-04-16	1985-10-24
1986	1986-02-18	1986-10-05
1987	1987-04-11	1987-12-12
1988	1988-03-11	1988-11-27
1989	1989-03-13	1989-11-15
1990	1990-02-16	1990-10-21
1991	1991-03-06	1991-10-30
1992	1992-05-03	1992-11-01
1993	1993-04-26	1993-10-20
1994	1994-04-11	1994-11-04
1997	1997-03-21	1997-10-31
1998	1998-04-07	1998-10-16

Every Fixed Threshold

Fixed thresholds at Red Rock
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	30	173	1989	157
35 C (95 F): Days	30	92	1998	92
40 C (104 F): Days	11	9	1986	8
90 F (32.2 C): Days	30	136	1990	135
100 F (37.8 C): Days	29	44	1990	44
0 C (32 F): Ice days (max	9	6	1983	2
0 C (32 F): Frost days (min	30	62	1993	30
-10 C (14 F): Days with min	16	6	1983	3
20 C (68 F): Tropical nights (min	30	144	1998	144
25 C (77 F): Days with min	18	24	1998	24
10 mm (0.39 in): Days with 10 mm or more rain	32	44	1976	33
25 mm (0.98 in): Days with 25 mm or more rain	32	21	1976	16
50 mm (1.97 in): Days with 50 mm or more rain	29	6	1998	4
100 mm (3.94 in): Days with 100 mm or more rain	11	2	1998	2
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1998	1
10 cm (3.9 in): Days with 10 cm or more snowfall	1	1	1985	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1966.

Download the Data

Data for Red Rock 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).

Red Rock Threshold Days by Year (USC00417497)

Key Facts for Red Rock Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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