Bonesteel Threshold Days by Year (USC00390778)

18 fixed thresholds counted per year at Bonesteel (USC00390778): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Bonesteel Thresholds

Bonesteel: days with a maximum temperature at or above 30 C (86 F) in 43 years, most in 1980 with 87.
Bonesteel: days with a maximum temperature at or above 90 F (32.2 C) in 43 years, most in 1980 with 70.
Bonesteel: days with a maximum temperature at or below 0 C (32 F) in 43 years, most in 1978 with 82.
Bonesteel: days with 10 mm (0.39 in) or more of precipitation in 43 years, most in 1993 with 32.
18 fixed thresholds have at least one qualifying day at Bonesteel.

Days at or above 30 C (86 F)

43 years with a qualifying day

Days per year at Bonesteel with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 87 in 1980.

Days at or above 30 C (86 F) per year at Bonesteel
Year	Days	Decade average
1957	41	41
1960	55	56.8
1961	61	56.8
1962	37	56.8
1963	65	56.8
1964	72	56.8
1965	41	56.8
1966	62	56.8
1967	56	56.8
1968	63	56.8
1969	56	56.8
1970	84	64.4
1971	66	64.4
1972	49	64.4
1973	61	64.4
1974	63	64.4
1975	68	64.4
1976	77	64.4
1977	50	64.4
1978	62	64.4
1979	64	64.4
1980	87	53.4
1981	61	53.4
1982	46	53.4
1985	38	53.4
1986	33	53.4
1987	58	53.4
1988	60	53.4
1989	44	53.4
1990	56	37.5
1991	57	37.5
1992	8	37.5
1993	15	37.5
1994	28	37.5
1995	47	37.5
1996	26	37.5
1997	44	37.5
1998	50	37.5
1999	44	37.5
2000	67	66.5
2001	59	66.5
2002	69	66.5
2003	71	66.5

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

First to last qualifying date each year at Bonesteel
Year	First date	Last date
1957	1957-05-07	1957-09-01
1960	1960-05-30	1960-10-11
1961	1961-05-10	1961-10-16
1962	1962-04-24	1962-10-10
1963	1963-04-01	1963-10-05
1964	1964-04-16	1964-10-15
1965	1965-04-29	1965-09-02
1966	1966-05-04	1966-10-07
1967	1967-05-22	1967-10-03
1968	1968-04-30	1968-10-14
1969	1969-05-14	1969-09-15
1970	1970-05-17	1970-10-05
1971	1971-04-15	1971-09-14
1972	1972-05-16	1972-09-20
1973	1973-05-20	1973-10-07
1974	1974-06-03	1974-10-09
1975	1975-05-19	1975-10-07
1976	1976-05-19	1976-10-01
1977	1977-04-09	1977-09-08
1978	1978-03-30	1978-10-01
1979	1979-05-27	1979-09-17
1980	1980-04-20	1980-10-10
1981	1981-05-02	1981-09-23
1982	1982-05-09	1982-09-08
1985	1985-04-12	1985-09-18
1986	1986-06-16	1986-09-01
1987	1987-04-25	1987-09-27
1988	1988-04-08	1988-09-18
1989	1989-04-23	1989-10-01
1990	1990-04-23	1990-10-06
1991	1991-04-07	1991-10-17
1992	1992-05-01	1992-10-03
1993	1993-06-22	1993-10-07
1994	1994-05-30	1994-09-20
1995	1995-06-07	1995-09-16
1996	1996-05-17	1996-09-08
1997	1997-05-18	1997-10-03
1998	1998-05-18	1998-09-28
1999	1999-06-05	1999-10-10
2000	2000-05-05	2000-10-20
2001	2001-04-29	2001-10-03
2002	2002-05-30	2002-09-17
2003	2003-04-15	2003-10-20

Every Fixed Threshold

Fixed thresholds at Bonesteel
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	43	87	1980	71
35 C (95 F): Days	42	39	1980	13
40 C (104 F): Days	15	4	1976	3
90 F (32.2 C): Days	43	70	1980	41
100 F (37.8 C): Days	32	14	1980	3
0 C (32 F): Ice days (max	43	82	1978	55
0 C (32 F): Frost days (min	42	181	1970	147
-10 C (14 F): Days with min	42	84	1978	62
-20 C (-4 F): Days with min	42	39	1978	8
-30 C (-22 F): Days with min	20	4	1966	3
20 C (68 F): Tropical nights (min	41	34	1982	11
25 C (77 F): Days with min	10	10	1982	10
10 mm (0.39 in): Days with 10 mm or more rain	43	32	1993	16
25 mm (0.98 in): Days with 25 mm or more rain	43	18	1962	3
50 mm (1.97 in): Days with 50 mm or more rain	31	3	1989	2
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1971	1
10 cm (3.9 in): Days with 10 cm or more snowfall	41	8	1982	5
25 cm (9.8 in): Days with 25 cm or more snowfall	17	3	1982	1

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 Bonesteel 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).

Bonesteel Threshold Days by Year (USC00390778)

Key Facts for Bonesteel Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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