Preston Threshold Days by Year (CA006146711)

16 fixed thresholds counted per year at Preston (CA006146711): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Preston Thresholds

Preston: days with a maximum temperature at or above 30 C (86 F) in 30 years, most in 1955 with 47.
Preston: days with a maximum temperature at or below 0 C (32 F) in 30 years, most in 1960 with 93.
Preston: nights with a minimum temperature at or below 0 C (32 F) in 30 years, most in 1978 with 186.
Preston: nights with a minimum temperature at or below -10 C (14 F) in 30 years, most in 1978 with 78.
16 fixed thresholds have at least one qualifying day at Preston.

Days at or above 30 C (86 F)

30 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 47 in 1955.

Days at or above 30 C (86 F) per year at Preston
Year	Days	Decade average
1954	15	20
1955	47	20
1956	6	20
1957	12	20
1958	7	20
1959	33	20
1960	7	15.1
1961	12	15.1
1962	12	15.1
1963	21	15.1
1964	21	15.1
1965	11	15.1
1966	26	15.1
1967	3	15.1
1968	16	15.1
1969	22	15.1
1970	9	10.6
1971	12	10.6
1972	7	10.6
1973	17	10.6
1974	8	10.6
1975	12	10.6
1976	7	10.6
1977	9	10.6
1978	15	10.6
1979	10	10.6
1980	8	11.3
1981	7	11.3
1982	5	11.3
1983	25	11.3

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
1954	1954-06-10	1954-09-07
1955	1955-06-17	1955-09-19
1956	1956-06-12	1956-07-27
1957	1957-06-16	1957-09-02
1958	1958-07-02	1958-08-12
1959	1959-06-08	1959-09-09
1960	1960-07-22	1960-09-08
1961	1961-06-12	1961-09-10
1962	1962-05-15	1962-08-31
1963	1963-06-06	1963-07-28
1964	1964-05-23	1964-09-08
1965	1965-06-06	1965-09-19
1966	1966-06-23	1966-09-02
1967	1967-06-12	1967-06-16
1968	1968-06-07	1968-08-24
1969	1969-05-28	1969-09-06
1970	1970-06-11	1970-08-26
1971	1971-06-19	1971-09-08
1972	1972-07-11	1972-07-23
1973	1973-06-11	1973-09-04
1974	1974-07-03	1974-08-21
1975	1975-05-24	1975-08-02
1976	1976-06-08	1976-09-09
1977	1977-05-17	1977-08-28
1978	1978-05-27	1978-09-11
1979	1979-06-16	1979-07-24
1980	1980-06-24	1980-08-27
1981	1981-06-15	1981-07-19
1982	1982-07-07	1982-07-18
1983	1983-06-13	1983-09-10

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	30	47	1955	25
35 C (95 F): Days	4	11	1955	1
90 F (32.2 C): Days	21	27	1955	7
100 F (37.8 C): Days	1	4	1955	4
0 C (32 F): Ice days (max	30	93	1960	58
0 C (32 F): Frost days (min	30	186	1978	158
-10 C (14 F): Days with min	30	78	1978	38
-20 C (-4 F): Days with min	30	21	1978	2
-30 C (-22 F): Days with min	5	2	1976	1
20 C (68 F): Tropical nights (min	29	13	1983	13
10 mm (0.39 in): Days with 10 mm or more rain	30	41	1979	36
25 mm (0.98 in): Days with 25 mm or more rain	30	10	1954	5
50 mm (1.97 in): Days with 50 mm or more rain	12	3	1964	2
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1968	1
10 cm (3.9 in): Days with 10 cm or more snowfall	28	6	1965	3
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1966	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1954.

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 (CA006146711)

Key Facts for Preston Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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