St Mary Threshold Days by Year (USC00247292)

17 fixed thresholds counted per year at St Mary (USC00247292): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for St Mary Thresholds

St Mary: days with 10 mm (0.39 in) or more of precipitation in 24 years, most in 1989 with 24.
St Mary: days with 10 cm (3.9 in) or more of snowfall in 24 years, most in 1990 with 19.
St Mary: nights with a minimum temperature at or below 0 C (32 F) in 23 years, most in 1982 with 196.
St Mary: nights with a minimum temperature at or below -10 C (14 F) in 23 years, most in 1982 with 83.
17 fixed thresholds have at least one qualifying day at St Mary.

Days at or above 30 C (86 F)

21 years with a qualifying day

Days per year at St Mary with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 35 in 2001.

Days at or above 30 C (86 F) per year at St Mary
Year	Days	Decade average
1982	9	16
1983	14	16
1984	20	16
1985	15	16
1986	20	16
1987	9	16
1988	29	16
1989	12	16
1990	23	18
1992	15	18
1993	5	18
1994	25	18
1996	27	18
1997	13	18
2000	33	27.7
2001	35	27.7
2004	15	27.7
2011	2	5.5
2012	11	5.5
2013	5	5.5
2014	4	5.5

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

First to last qualifying date each year at St Mary
Year	First date	Last date
1982	1982-07-27	1982-08-21
1983	1983-07-05	1983-08-31
1984	1984-06-28	1984-08-23
1985	1985-06-30	1985-07-23
1986	1986-05-26	1986-08-28
1987	1987-06-14	1987-07-31
1988	1988-06-16	1988-09-05
1989	1989-07-07	1989-08-13
1990	1990-06-23	1990-09-05
1992	1992-06-23	1992-10-01
1993	1993-05-11	1993-07-29
1994	1994-06-20	1994-09-17
1996	1996-06-07	1996-08-31
1997	1997-07-21	1997-09-24
2000	2000-07-09	2000-09-16
2001	2001-05-24	2001-09-26
2004	2004-07-14	2004-08-16
2011	2011-07-18	2011-08-28
2012	2012-07-07	2012-08-20
2013	2013-07-02	2013-09-01
2014	2014-07-29	2014-08-12

Every Fixed Threshold

Fixed thresholds at St Mary
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	21	35	2001	4
35 C (95 F): Days	9	5	2000	1
90 F (32.2 C): Days	17	22	2001	1
0 C (32 F): Ice days (max	22	74	1982	64
0 C (32 F): Frost days (min	23	196	1982	172
-10 C (14 F): Days with min	23	83	1982	76
-20 C (-4 F): Days with min	23	42	1996	37
-30 C (-22 F): Days with min	19	8	1985	5
-40 C (-40 F): Days with min	1	1	1989	1
20 C (68 F): Tropical nights (min	1	1	1988	1
10 mm (0.39 in): Days with 10 mm or more rain	24	24	1989	12
25 mm (0.98 in): Days with 25 mm or more rain	22	8	1986	6
50 mm (1.97 in): Days with 50 mm or more rain	10	2	1990	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1987	1
10 cm (3.9 in): Days with 10 cm or more snowfall	24	19	1990	11
25 cm (9.8 in): Days with 25 cm or more snowfall	20	5	1986	2
50 cm (19.7 in): Days with 50 cm or more snowfall	4	1	1986	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1982.

Download the Data

Data for St Mary 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).

St Mary Threshold Days by Year (USC00247292)

Key Facts for St Mary Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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