Harlowton Threshold Days by Year (USC00243939)

17 fixed thresholds counted per year at Harlowton (USC00243939): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Harlowton Thresholds

Harlowton: days with a maximum temperature at or above 30 C (86 F) in 68 years, most in 1988 with 67.
Harlowton: days with a maximum temperature at or above 90 F (32.2 C) in 68 years, most in 1988 with 43.
Harlowton: days with a maximum temperature at or below 0 C (32 F) in 68 years, most in 1955 with 73.
Harlowton: nights with a minimum temperature at or below 0 C (32 F) in 68 years, most in 1951 with 220.
17 fixed thresholds have at least one qualifying day at Harlowton.

Days at or above 30 C (86 F)

68 years with a qualifying day

Days per year at Harlowton with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 67 in 1988.

Days at or above 30 C (86 F) per year at Harlowton
Year	Days	Decade average
1949	38	38
1950	17	29.6
1951	22	29.6
1952	25	29.6
1953	30	29.6
1954	31	29.6
1955	40	29.6
1956	35	29.6
1957	30	29.6
1958	33	29.6
1959	33	29.6
1960	37	30.8
1961	49	30.8
1962	13	30.8
1963	32	30.8
1964	31	30.8
1965	15	30.8
1966	41	30.8
1967	36	30.8
1968	15	30.8
1969	39	30.8
1970	44	30.4
1971	40	30.4
1972	19	30.4
1973	34	30.4
1974	38	30.4
1975	19	30.4
1976	25	30.4
1977	25	30.4
1978	24	30.4
1979	36	30.4
1980	22	34.9
1981	35	34.9
1982	25	34.9
1983	38	34.9
1984	44	34.9
1985	30	34.9
1986	29	34.9
1987	31	34.9
1988	67	34.9
1989	28	34.9
1990	37	35.5
1991	43	35.5
1992	30	35.5
1993	10	35.5
1994	51	35.5
1995	30	35.5
1996	41	35.5
1997	30	35.5
1998	48	35.5
1999	35	35.5
2000	45	38.5
2001	53	38.5
2002	29	38.5
2004	27	38.5
2012	59	39.9
2013	51	39.9
2014	32	39.9
2015	41	39.9
2016	40	39.9
2017	50	39.9
2018	25	39.9
2019	21	39.9
2022	57	41.6
2023	23	41.6
2024	49	41.6
2025	36	41.6
2026	43	41.6

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

First to last qualifying date each year at Harlowton
Year	First date	Last date
1949	1949-05-10	1949-09-23
1950	1950-06-30	1950-09-06
1951	1951-05-23	1951-08-18
1952	1952-04-25	1952-09-26
1953	1953-06-11	1953-09-12
1954	1954-05-19	1954-09-11
1955	1955-06-21	1955-09-14
1956	1956-06-01	1956-09-26
1957	1957-06-03	1957-09-27
1958	1958-05-20	1958-09-11
1959	1959-06-13	1959-09-13
1960	1960-05-11	1960-09-04
1961	1961-06-11	1961-08-29
1962	1962-06-26	1962-08-26
1963	1963-06-27	1963-09-30
1964	1964-06-24	1964-08-19
1965	1965-07-15	1965-08-12
1966	1966-05-27	1966-09-23
1967	1967-07-05	1967-09-29
1968	1968-06-02	1968-09-10
1969	1969-05-26	1969-09-12
1970	1970-06-22	1970-08-31
1971	1971-06-22	1971-09-11
1972	1972-05-31	1972-08-29
1973	1973-06-08	1973-08-30
1974	1974-06-17	1974-08-18
1975	1975-07-03	1975-08-28
1976	1976-06-30	1976-09-06
1977	1977-06-01	1977-09-07
1978	1978-05-15	1978-09-05
1979	1979-06-11	1979-09-16
1980	1980-05-21	1980-09-07
1981	1981-06-26	1981-09-19
1982	1982-07-19	1982-09-10
1983	1983-06-23	1983-09-07
1984	1984-05-29	1984-09-18
1985	1985-06-07	1985-08-30
1986	1986-05-29	1986-08-29
1987	1987-04-28	1987-09-25
1988	1988-05-16	1988-09-07
1989	1989-06-19	1989-09-29
1990	1990-06-23	1990-09-07
1991	1991-06-11	1991-09-07
1992	1992-05-06	1992-10-02
1993	1993-06-20	1993-08-11
1994	1994-06-20	1994-09-28
1995	1995-07-06	1995-09-04
1996	1996-04-10	1996-09-13
1997	1997-05-31	1997-10-01
1998	1998-07-08	1998-09-17
1999	1999-05-25	1999-08-31
2000	2000-06-05	2000-09-17
2001	2001-05-12	2001-09-25
2002	2002-06-16	2002-09-17
2004	2004-06-05	2004-09-12
2012	2012-05-17	2012-09-15
2013	2013-05-12	2013-09-22
2014	2014-07-03	2014-09-26
2015	2015-06-09	2015-10-11
2016	2016-06-06	2016-09-03
2017	2017-06-05	2017-09-13
2018	2018-07-07	2018-09-09
2019	2019-06-07	2019-09-16
2022	2022-06-17	2022-09-28
2023	2023-07-01	2023-09-02
2024	2024-06-14	2024-10-04
2025	2025-06-09	2025-09-24
2026	2026-05-13	2026-08-27

Every Fixed Threshold

Fixed thresholds at Harlowton
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	68	67	1988	43
35 C (95 F): Days	52	17	2012	10
40 C (104 F): Days	1	0	n/a	1
90 F (32.2 C): Days	68	43	1988	30
100 F (37.8 C): Days	11	2	2000	3
0 C (32 F): Ice days (max	68	73	1955	12
0 C (32 F): Frost days (min	68	220	1951	99
-10 C (14 F): Days with min	68	107	1951	18
-20 C (-4 F): Days with min	68	31	1955	7
-30 C (-22 F): Days with min	48	8	1949	6
-40 C (-40 F): Days with min	1	1	2024	1
10 mm (0.39 in): Days with 10 mm or more rain	58	17	1997	6
25 mm (0.98 in): Days with 25 mm or more rain	41	4	1962	1
50 mm (1.97 in): Days with 50 mm or more rain	7	2	1997	1
10 cm (3.9 in): Days with 10 cm or more snowfall	53	8	1950	2
25 cm (9.8 in): Days with 25 cm or more snowfall	5	1	1950	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1950	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1949.

Download the Data

Data for Harlowton 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 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Harlowton Threshold Days by Year (USC00243939)

Key Facts for Harlowton Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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