Sweetgrass Threshold Days by Year (USC00248093)

16 fixed thresholds counted per year at Sweetgrass (USC00248093): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Sweetgrass Thresholds

Sweetgrass: days with 10 mm (0.39 in) or more of precipitation in 44 years, most in 1978 with 17.
Sweetgrass: days with 25 mm (0.98 in) or more of precipitation in 38 years, most in 1978 with 9.
Sweetgrass: nights with a minimum temperature at or below 0 C (32 F) in 34 years, most in 1970 with 201.
Sweetgrass: nights with a minimum temperature at or below -10 C (14 F) in 34 years, most in 1982 with 97.
16 fixed thresholds have at least one qualifying day at Sweetgrass.

Days at or above 30 C (86 F)

32 years with a qualifying day

Days per year at Sweetgrass with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 49 in 2007.

Days at or above 30 C (86 F) per year at Sweetgrass
Year	Days	Decade average
1957	30	29
1958	28	29
1960	32	26.2
1961	46	26.2
1962	18	26.2
1963	30	26.2
1964	17	26.2
1965	13	26.2
1966	22	26.2
1967	38	26.2
1968	14	26.2
1969	32	26.2
1970	39	24.5
1971	38	24.5
1972	13	24.5
1973	31	24.5
1974	29	24.5
1975	13	24.5
1976	20	24.5
1977	16	24.5
1978	18	24.5
1979	28	24.5
1980	15	24.5
1981	25	24.5
1982	16	24.5
1983	23	24.5
1985	26	24.5
1988	42	24.5
1998	36	25.5
1999	15	25.5
2006	43	46
2007	49	46

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

First to last qualifying date each year at Sweetgrass
Year	First date	Last date
1957	1957-07-05	1957-09-28
1958	1958-05-28	1958-09-11
1960	1960-05-12	1960-09-04
1961	1961-06-04	1961-08-25
1962	1962-06-24	1962-08-25
1963	1963-05-30	1963-09-29
1964	1964-06-26	1964-08-19
1965	1965-06-11	1965-08-12
1966	1966-05-26	1966-09-07
1967	1967-07-12	1967-09-29
1968	1968-06-27	1968-09-11
1969	1969-06-04	1969-09-12
1970	1970-06-05	1970-09-01
1971	1971-06-22	1971-08-28
1972	1972-06-06	1972-08-30
1973	1973-06-22	1973-08-22
1974	1974-06-12	1974-09-26
1975	1975-07-03	1975-07-29
1976	1976-07-07	1976-09-06
1977	1977-06-01	1977-08-19
1978	1978-06-28	1978-09-05
1979	1979-06-12	1979-10-10
1980	1980-05-21	1980-09-07
1981	1981-07-01	1981-09-19
1982	1982-06-21	1982-09-04
1983	1983-07-06	1983-09-02
1985	1985-06-19	1985-08-26
1988	1988-05-16	1988-10-12
1998	1998-07-09	1998-09-08
1999	1999-07-13	1999-08-30
2006	2006-05-17	2006-09-12
2007	2007-06-22	2007-09-05

Every Fixed Threshold

Fixed thresholds at Sweetgrass
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	32	49	2007	49
35 C (95 F): Days	20	15	2007	15
40 C (104 F): Days	2	2	2007	2
90 F (32.2 C): Days	32	32	2007	32
100 F (37.8 C): Days	6	6	2007	6
0 C (32 F): Ice days (max	32	84	1978	54
0 C (32 F): Frost days (min	34	201	1970	168
-10 C (14 F): Days with min	34	97	1982	69
-20 C (-4 F): Days with min	34	40	1978	12
-30 C (-22 F): Days with min	31	12	1969	2
-40 C (-40 F): Days with min	2	1	1983	1
20 C (68 F): Tropical nights (min	10	3	1971	2
10 mm (0.39 in): Days with 10 mm or more rain	44	17	1978	7
25 mm (0.98 in): Days with 25 mm or more rain	38	9	1978	1
50 mm (1.97 in): Days with 50 mm or more rain	12	2	1964	2
10 cm (3.9 in): Days with 10 cm or more snowfall	9	2	1930	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1957.

Download the Data

Data for Sweetgrass 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).

Sweetgrass Threshold Days by Year (USC00248093)

Key Facts for Sweetgrass Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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