Gillette 18 SW Threshold Days by Year (USC00483865)

16 fixed thresholds counted per year at Gillette 18 SW (USC00483865): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Gillette 18 SW Thresholds

Gillette 18 SW: days with a maximum temperature at or above 30 C (86 F) in 35 years, most in 1954 with 57.
Gillette 18 SW: days with a maximum temperature at or above 90 F (32.2 C) in 35 years, most in 1983 with 43.
Gillette 18 SW: days with a maximum temperature at or below 0 C (32 F) in 35 years, most in 1978 with 81.
Gillette 18 SW: nights with a minimum temperature at or below 0 C (32 F) in 35 years, most in 1970 with 205.
16 fixed thresholds have at least one qualifying day at Gillette 18 SW.

Days at or above 30 C (86 F)

35 years with a qualifying day

Days per year at Gillette 18 SW with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 57 in 1954.

Days at or above 30 C (86 F) per year at Gillette 18 SW
Year	Days	Decade average
1950	21	40.6
1951	20	40.6
1952	44	40.6
1953	53	40.6
1954	57	40.6
1955	53	40.6
1956	43	40.6
1957	36	40.6
1958	30	40.6
1959	49	40.6
1960	44	35.4
1961	48	35.4
1962	21	35.4
1963	39	35.4
1964	36	35.4
1965	16	35.4
1966	52	35.4
1967	23	35.4
1968	31	35.4
1969	44	35.4
1970	55	38.5
1971	44	38.5
1972	33	38.5
1973	39	38.5
1974	45	38.5
1975	40	38.5
1976	43	38.5
1977	32	38.5
1978	30	38.5
1979	24	38.5
1980	44	41
1981	31	41
1982	31	41
1983	56	41
1984	43	41

For each year, a bar from the first to the last day at Gillette 18 SW meeting 30 C (86 F).

First to last qualifying date each year at Gillette 18 SW
Year	First date	Last date
1950	1950-06-06	1950-09-05
1951	1951-07-05	1951-08-27
1952	1952-05-03	1952-09-27
1953	1953-06-11	1953-10-01
1954	1954-05-20	1954-09-22
1955	1955-07-04	1955-09-14
1956	1956-06-08	1956-09-20
1957	1957-07-01	1957-10-01
1958	1958-05-20	1958-09-22
1959	1959-06-06	1959-09-14
1960	1960-05-12	1960-09-05
1961	1961-06-09	1961-09-16
1962	1962-06-26	1962-08-26
1963	1963-06-27	1963-10-04
1964	1964-05-20	1964-09-17
1965	1965-07-07	1965-08-28
1966	1966-06-19	1966-09-23
1967	1967-07-20	1967-09-02
1968	1968-06-03	1968-09-13
1969	1969-05-25	1969-09-04
1970	1970-06-22	1970-09-08
1971	1971-06-18	1971-09-13
1972	1972-06-07	1972-09-18
1973	1973-06-09	1973-08-31
1974	1974-06-13	1974-08-24
1975	1975-07-02	1975-10-06
1976	1976-06-09	1976-09-17
1977	1977-06-01	1977-09-07
1978	1978-06-13	1978-09-10
1979	1979-06-11	1979-08-30
1980	1980-05-22	1980-09-30
1981	1981-07-01	1981-09-13
1982	1982-07-03	1982-09-10
1983	1983-06-21	1983-09-16
1984	1984-05-23	1984-09-18

Every Fixed Threshold

Fixed thresholds at Gillette 18 SW
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	35	57	1954	43
35 C (95 F): Days	33	17	1954	6
40 C (104 F): Days	1	1	1981	1
90 F (32.2 C): Days	35	43	1983	23
100 F (37.8 C): Days	11	5	1954	2
0 C (32 F): Ice days (max	35	81	1978	41
0 C (32 F): Frost days (min	35	205	1970	202
-10 C (14 F): Days with min	35	90	1955	50
-20 C (-4 F): Days with min	35	29	1978	10
-30 C (-22 F): Days with min	22	8	1983	8
20 C (68 F): Tropical nights (min	11	3	1983	3
10 mm (0.39 in): Days with 10 mm or more rain	35	18	1982	5
25 mm (0.98 in): Days with 25 mm or more rain	31	9	1982	3
50 mm (1.97 in): Days with 50 mm or more rain	9	2	1964	1
10 cm (3.9 in): Days with 10 cm or more snowfall	33	11	1955	5
25 cm (9.8 in): Days with 25 cm or more snowfall	10	2	1973	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1950.

Download the Data

Data for Gillette 18 SW 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).

Gillette 18 SW Threshold Days by Year (USC00483865)

Key Facts for Gillette 18 SW Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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