Rock Springs AP Threshold Days by Year (USW00024027)

13 fixed thresholds counted per year at Rock Springs AP (USW00024027): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rock Springs AP Thresholds

Rock Springs AP: days with a maximum temperature at or above 30 C (86 F) in 77 years, most in 2022 with 53.
Rock Springs AP: days with a maximum temperature at or below 0 C (32 F) in 77 years, most in 1964 with 103.
Rock Springs AP: nights with a minimum temperature at or below 0 C (32 F) in 77 years, most in 1970 with 227.
Rock Springs AP: nights with a minimum temperature at or below -10 C (14 F) in 77 years, most in 1964 with 92.
13 fixed thresholds have at least one qualifying day at Rock Springs AP.

Days at or above 30 C (86 F)

77 years with a qualifying day

Days per year at Rock Springs AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 53 in 2022.

Days at or above 30 C (86 F) per year at Rock Springs AP
Year	Days	Decade average
1948	29	22.5
1949	16	22.5
1950	7	19.8
1951	17	19.8
1952	11	19.8
1953	29	19.8
1954	34	19.8
1955	30	19.8
1956	17	19.8
1957	15	19.8
1958	19	19.8
1959	19	19.8
1960	21	18.7
1961	8	18.7
1962	6	18.7
1963	6	18.7
1964	8	18.7
1965	2	18.7
1966	31	18.7
1967	37	18.7
1968	29	18.7
1969	39	18.7
1970	38	29.5
1971	42	29.5
1972	20	29.5
1973	26	29.5
1974	47	29.5
1975	16	29.5
1976	30	29.5
1977	34	29.5
1978	22	29.5
1979	20	29.5
1980	12	17
1981	15	17
1984	10	17
1985	20	17
1986	7	17
1987	9	17
1988	40	17
1989	23	17
1990	30	15.2
1991	20	15.2
1992	11	15.2
1993	1	15.2
1994	29	15.2
1995	12	15.2
1996	17	15.2
1997	6	15.2
1998	18	15.2
1999	8	15.2
2000	30	33.6
2001	39	33.6
2002	38	33.6
2003	48	33.6
2004	16	33.6
2005	23	33.6
2006	35	33.6
2007	51	33.6
2008	35	33.6
2009	21	33.6
2010	28	35.9
2011	31	35.9
2012	50	35.9
2013	48	35.9
2014	28	35.9
2015	24	35.9
2016	35	35.9
2017	37	35.9
2018	40	35.9
2019	38	35.9
2020	52	46
2021	51	46
2022	53	46
2023	30	46
2024	39	46
2025	48	46
2026	49	46

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

First to last qualifying date each year at Rock Springs AP
Year	First date	Last date
1948	1948-07-04	1948-09-14
1949	1949-07-01	1949-08-21
1950	1950-07-01	1950-09-05
1951	1951-07-05	1951-08-18
1952	1952-06-09	1952-09-04
1953	1953-06-11	1953-08-25
1954	1954-05-19	1954-09-01
1955	1955-06-22	1955-09-07
1956	1956-06-10	1956-08-23
1957	1957-06-29	1957-08-24
1958	1958-06-27	1958-08-16
1959	1959-06-12	1959-09-07
1960	1960-06-25	1960-08-21
1961	1961-06-21	1961-08-05
1962	1962-06-26	1962-08-16
1963	1963-06-27	1963-07-31
1964	1964-07-07	1964-08-04
1965	1965-07-21	1965-07-29
1966	1966-06-19	1966-08-17
1967	1967-07-01	1967-09-03
1968	1968-06-18	1968-08-07
1969	1969-05-26	1969-08-27
1970	1970-06-22	1970-08-30
1971	1971-06-20	1971-08-27
1972	1972-06-30	1972-08-17
1973	1973-06-09	1973-08-20
1974	1974-06-13	1974-09-09
1975	1975-06-30	1975-08-10
1976	1976-06-28	1976-09-05
1977	1977-06-02	1977-09-07
1978	1978-06-23	1978-09-05
1979	1979-06-13	1979-09-07
1980	1980-06-26	1980-08-12
1981	1981-06-25	1981-08-05
1984	1984-06-29	1984-08-18
1985	1985-06-07	1985-08-30
1986	1986-06-16	1986-07-13
1987	1987-06-27	1987-08-19
1988	1988-06-04	1988-08-30
1989	1989-06-15	1989-08-08
1990	1990-06-23	1990-09-15
1991	1991-07-04	1991-08-31
1992	1992-07-05	1992-08-15
1993	1993-08-24	1993-08-24
1994	1994-06-23	1994-08-26
1995	1995-07-07	1995-09-04
1996	1996-07-01	1996-09-04
1997	1997-07-09	1997-08-23
1998	1998-07-02	1998-09-07
1999	1999-07-02	1999-07-27
2000	2000-06-05	2000-08-15
2001	2001-06-10	2001-08-28
2002	2002-05-30	2002-08-19
2003	2003-05-28	2003-08-26
2004	2004-07-07	2004-09-01
2005	2005-06-21	2005-08-29
2006	2006-06-02	2006-08-23
2007	2007-06-16	2007-09-04
2008	2008-06-30	2008-08-30
2009	2009-06-30	2009-08-28
2010	2010-06-24	2010-09-19
2011	2011-06-28	2011-08-31
2012	2012-06-03	2012-08-29
2013	2013-06-09	2013-09-05
2014	2014-06-25	2014-08-18
2015	2015-06-19	2015-08-29
2016	2016-06-09	2016-08-31
2017	2017-06-20	2017-09-04
2018	2018-06-13	2018-08-17
2019	2019-06-28	2019-09-05
2020	2020-05-29	2020-09-06
2021	2021-06-03	2021-09-10
2022	2022-06-10	2022-09-08
2023	2023-07-03	2023-08-29
2024	2024-06-12	2024-09-02
2025	2025-06-01	2025-09-03
2026	2026-06-06	2026-08-27

Every Fixed Threshold

Fixed thresholds at Rock Springs AP
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	77	53	2022	49
35 C (95 F): Days	19	5	2002	9
90 F (32.2 C): Days	68	29	2003	29
0 C (32 F): Ice days (max	77	103	1964	8
0 C (32 F): Frost days (min	77	227	1970	104
-10 C (14 F): Days with min	77	92	1964	14
-20 C (-4 F): Days with min	73	21	1949	3
-30 C (-22 F): Days with min	14	5	1989	1
10 mm (0.39 in): Days with 10 mm or more rain	74	11	1965	1
25 mm (0.98 in): Days with 25 mm or more rain	16	3	1973	1
50 mm (1.97 in): Days with 50 mm or more rain	1	1	1973	1
10 cm (3.9 in): Days with 10 cm or more snowfall	45	8	1978	4
25 cm (9.8 in): Days with 25 cm or more snowfall	6	1	1962	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1948.

Download the Data

Data for Rock Springs 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Rock Springs AP Threshold Days by Year (USW00024027)

Key Facts for Rock Springs AP Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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