Preston Threshold Days by Year (USC00107346)

15 fixed thresholds counted per year at Preston (USC00107346): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Preston Thresholds

Preston: days with 10 mm (0.39 in) or more of precipitation in 45 years, most in 2019 with 19.
Preston: days with a maximum temperature at or above 30 C (86 F) in 43 years, most in 1994 with 81.
Preston: days with a maximum temperature at or below 0 C (32 F) in 43 years, most in 1985 with 80.
Preston: days with a maximum temperature at or above 90 F (32.2 C) in 42 years, most in 2021 with 54.
15 fixed thresholds have at least one qualifying day at Preston.

Days at or above 30 C (86 F)

43 years with a qualifying day

Days per year at Preston with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 81 in 1994.

Days at or above 30 C (86 F) per year at Preston
Year	Days	Decade average
1965	31	50.4
1966	70	50.4
1967	58	50.4
1968	37	50.4
1969	56	50.4
1970	53	54
1971	55	54
1981	66	49
1984	35	49
1985	53	49
1987	42	49
1990	66	55
1991	51	55
1992	46	55
1993	22	55
1994	81	55
1995	59	55
1996	67	55
1999	48	55
2002	63	56.9
2003	66	56.9
2004	46	56.9
2005	57	56.9
2006	69	56.9
2007	50	56.9
2009	47	56.9
2010	55	61.7
2011	39	61.7
2012	70	61.7
2013	70	61.7
2014	54	61.7
2015	61	61.7
2016	69	61.7
2017	72	61.7
2018	71	61.7
2019	56	61.7
2020	73	65.6
2021	71	65.6
2022	73	65.6
2023	45	65.6
2024	68	65.6
2025	71	65.6
2026	58	65.6

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

First to last qualifying date each year at Preston
Year	First date	Last date
1965	1965-06-23	1965-08-17
1966	1966-05-28	1966-09-24
1967	1967-05-24	1967-09-08
1968	1968-06-19	1968-08-09
1969	1969-06-05	1969-09-08
1970	1970-06-04	1970-09-03
1971	1971-06-18	1971-08-28
1981	1981-06-25	1981-09-19
1984	1984-06-26	1984-09-05
1985	1985-06-07	1985-08-31
1987	1987-06-12	1987-09-23
1990	1990-06-22	1990-09-16
1991	1991-06-11	1991-09-06
1992	1992-06-11	1992-09-24
1993	1993-06-21	1993-08-25
1994	1994-05-12	1994-09-26
1995	1995-06-14	1995-09-18
1996	1996-05-14	1996-09-12
1999	1999-06-16	1999-08-28
2002	2002-05-19	2002-09-04
2003	2003-05-23	2003-09-04
2004	2004-06-03	2004-09-01
2005	2005-06-20	2005-09-08
2006	2006-05-16	2006-09-12
2007	2007-05-12	2007-09-04
2009	2009-05-18	2009-09-11
2010	2010-06-24	2010-10-02
2011	2011-06-23	2011-08-31
2012	2012-05-15	2012-09-09
2013	2013-05-13	2013-09-06
2014	2014-05-28	2014-09-26
2015	2015-06-09	2015-09-26
2016	2016-06-04	2016-09-02
2017	2017-05-31	2017-09-12
2018	2018-06-04	2018-10-02
2019	2019-06-27	2019-09-15
2020	2020-05-28	2020-09-16
2021	2021-06-02	2021-09-10
2022	2022-06-10	2022-09-21
2023	2023-07-01	2023-08-31
2024	2024-06-06	2024-09-29
2025	2025-05-31	2025-09-03
2026	2026-05-12	2026-08-27

Every Fixed Threshold

Fixed thresholds at Preston
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	43	81	1994	58
35 C (95 F): Days	39	22	2003	13
90 F (32.2 C): Days	42	54	2021	38
100 F (37.8 C): Days	8	4	2003	1
0 C (32 F): Ice days (max	43	80	1985	11
0 C (32 F): Frost days (min	39	211	1970	89
-10 C (14 F): Days with min	39	92	1985	8
-20 C (-4 F): Days with min	28	17	1985	2
-30 C (-22 F): Days with min	4	3	1984	2
20 C (68 F): Tropical nights (min	3	1	2005	4
10 mm (0.39 in): Days with 10 mm or more rain	45	19	2019	4
25 mm (0.98 in): Days with 25 mm or more rain	29	5	1981	1
50 mm (1.97 in): Days with 50 mm or more rain	2	1	2004	1
10 cm (3.9 in): Days with 10 cm or more snowfall	37	9	1996	1
25 cm (9.8 in): Days with 25 cm or more snowfall	7	2	2011	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1965.

Download the Data

Data for Preston 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Preston Threshold Days by Year (USC00107346)

Key Facts for Preston Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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