Boswell 1 S Threshold Days by Year

17 fixed thresholds counted per year at Boswell 1 S (USC00340980): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Boswell 1 S Thresholds

Boswell 1 S: days with 10 mm (0.39 in) or more of precipitation in 47 years, most in 1957 with 49.
Boswell 1 S: days with 25 mm (0.98 in) or more of precipitation in 47 years, most in 1990 with 25.
Boswell 1 S: days with 50 mm (1.97 in) or more of precipitation in 45 years, most in 1950 with 8.
Boswell 1 S: nights with a minimum temperature at or below 0 C (32 F) in 31 years, most in 1976 with 78.
17 fixed thresholds have at least one qualifying day at Boswell 1 S.

Days at or above 30 C (86 F)

28 years with a qualifying day

Days per year at Boswell 1 S with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 133 in 1998.

Days at or above 30 C (86 F) per year at Boswell 1 S
Year	Days	Decade average
1960	109	103.1
1961	84	103.1
1962	104	103.1
1963	125	103.1
1964	100	103.1
1965	106	103.1
1967	90	103.1
1969	107	103.1
1970	103	106.3
1971	99	106.3
1972	127	106.3
1973	105	106.3
1974	91	106.3
1975	114	106.3
1976	87	106.3
1977	124	106.3
1981	102	109
1985	94	109
1986	108	109
1988	129	109
1989	112	109
1990	113	114.9
1991	125	114.9
1992	98	114.9
1993	111	114.9
1994	113	114.9
1997	111	114.9
1998	133	114.9

For each year, a bar from the first to the last day at Boswell 1 S meeting 30 C (86 F).

First to last qualifying date each year at Boswell 1 S
Year	First date	Last date
1960	1960-04-06	1960-10-01
1961	1961-05-19	1961-09-29
1962	1962-05-17	1962-10-15
1963	1963-04-22	1963-10-22
1964	1964-05-19	1964-09-10
1965	1965-06-02	1965-10-10
1967	1967-03-11	1967-10-04
1969	1969-01-08	1969-10-11
1970	1970-05-19	1970-10-03
1971	1971-05-25	1971-10-02
1972	1972-03-23	1972-10-18
1973	1973-05-10	1973-10-08
1974	1974-03-30	1974-09-01
1975	1975-04-24	1975-10-22
1976	1976-06-07	1976-10-11
1977	1977-05-25	1977-10-31
1981	1981-04-30	1981-10-06
1985	1985-05-29	1985-09-22
1986	1986-05-12	1986-10-03
1988	1988-04-22	1988-10-25
1989	1989-03-14	1989-11-06
1990	1990-04-29	1990-10-21
1991	1991-03-05	1991-10-24
1992	1992-05-12	1992-10-27
1993	1993-05-15	1993-10-16
1994	1994-04-22	1994-10-06
1997	1997-03-21	1997-10-07
1998	1998-05-07	1998-10-18

Every Fixed Threshold

Fixed thresholds at Boswell 1 S
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	28	133	1998	133
35 C (95 F): Days	28	81	1998	81
40 C (104 F): Days	9	18	1998	18
90 F (32.2 C): Days	28	111	1998	111
100 F (37.8 C): Days	23	45	1998	45
0 C (32 F): Ice days (max	21	9	1963	1
0 C (32 F): Frost days (min	31	78	1976	55
-10 C (14 F): Days with min	29	16	1963	5
20 C (68 F): Tropical nights (min	31	103	1998	103
25 C (77 F): Days with min	23	6	1969	5
10 mm (0.39 in): Days with 10 mm or more rain	47	49	1957	34
25 mm (0.98 in): Days with 25 mm or more rain	47	25	1990	11
50 mm (1.97 in): Days with 50 mm or more rain	45	8	1950	2
100 mm (3.94 in): Days with 100 mm or more rain	16	2	1949	1
200 mm (7.87 in): Days with 200 mm or more rain	2	1	1957	1
10 cm (3.9 in): Days with 10 cm or more snowfall	9	1	1948	1
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1988	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1960.

Download the Data

Data for Boswell 1 S 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Boswell 1 S Threshold Days by Year

Key Facts for Boswell 1 S Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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