Pierson Threshold Days by Year (CA005012080)

18 fixed thresholds counted per year at Pierson (CA005012080): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Pierson Thresholds

Pierson: days with a maximum temperature at or above 30 C (86 F) in 46 years, most in 1936 with 51.
Pierson: days with a maximum temperature at or above 90 F (32.2 C) in 46 years, most in 1936 with 36.
Pierson: days with a maximum temperature at or below 0 C (32 F) in 46 years, most in 1935 with 141.
Pierson: nights with a minimum temperature at or below 0 C (32 F) in 46 years, most in 1936 with 217.
18 fixed thresholds have at least one qualifying day at Pierson.

Days at or above 30 C (86 F)

46 years with a qualifying day

Days per year at Pierson with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 51 in 1936.

Days at or above 30 C (86 F) per year at Pierson
Year	Days	Decade average
1933	35	31.1
1934	32	31.1
1935	12	31.1
1936	51	31.1
1937	27	31.1
1938	31	31.1
1939	30	31.1
1940	25	21.4
1946	18	21.4
1947	26	21.4
1948	18	21.4
1949	20	21.4
1950	2	16.3
1951	9	16.3
1952	21	16.3
1953	22	16.3
1954	9	16.3
1955	19	16.3
1956	12	16.3
1957	26	16.3
1958	20	16.3
1959	23	16.3
1960	25	22.3
1961	49	22.3
1962	8	22.3
1963	18	22.3
1964	11	22.3
1965	10	22.3
1966	32	22.3
1967	34	22.3
1968	12	22.3
1969	24	22.3
1970	28	19.7
1971	16	19.7
1972	16	19.7
1973	19	19.7
1974	20	19.7
1975	16	19.7
1976	19	19.7
1977	18	19.7
1978	21	19.7
1979	24	19.7
1980	34	32
1981	34	32
1982	20	32
1983	40	32

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

First to last qualifying date each year at Pierson
Year	First date	Last date
1933	1933-05-31	1933-09-18
1934	1934-05-05	1934-10-13
1935	1935-06-28	1935-09-22
1936	1936-05-15	1936-09-22
1937	1937-05-28	1937-09-02
1938	1938-06-18	1938-09-25
1939	1939-05-05	1939-09-18
1940	1940-05-11	1940-09-04
1946	1946-05-29	1946-09-16
1947	1947-07-02	1947-09-04
1948	1948-05-18	1948-09-11
1949	1949-04-29	1949-08-25
1950	1950-07-28	1950-07-29
1951	1951-05-23	1951-07-29
1952	1952-04-26	1952-09-27
1953	1953-05-06	1953-10-01
1954	1954-06-23	1954-08-31
1955	1955-05-20	1955-09-04
1956	1956-05-21	1956-09-26
1957	1957-07-06	1957-10-02
1958	1958-05-12	1958-09-01
1959	1959-05-17	1959-09-13
1960	1960-05-12	1960-09-20
1961	1961-05-30	1961-08-31
1962	1962-06-27	1962-08-25
1963	1963-05-30	1963-10-04
1964	1964-05-20	1964-09-17
1965	1965-07-15	1965-08-23
1966	1966-05-21	1966-09-12
1967	1967-06-27	1967-09-11
1968	1968-06-02	1968-08-05
1969	1969-05-26	1969-09-13
1970	1970-06-04	1970-09-18
1971	1971-06-03	1971-09-02
1972	1972-05-15	1972-08-30
1973	1973-06-01	1973-08-31
1974	1974-06-19	1974-08-07
1975	1975-06-24	1975-08-06
1976	1976-06-02	1976-09-17
1977	1977-04-09	1977-07-23
1978	1978-06-09	1978-09-10
1979	1979-05-16	1979-09-16
1980	1980-04-20	1980-09-07
1981	1981-05-20	1981-09-18
1982	1982-05-03	1982-09-10
1983	1983-06-10	1983-09-26

Every Fixed Threshold

Fixed thresholds at Pierson
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	46	51	1936	40
35 C (95 F): Days	39	15	1933	8
40 C (104 F): Days	2	1	1936	1
90 F (32.2 C): Days	46	36	1936	18
100 F (37.8 C): Days	15	6	1936	1
0 C (32 F): Ice days (max	46	141	1935	111
0 C (32 F): Frost days (min	46	217	1936	200
-10 C (14 F): Days with min	46	140	1935	87
-20 C (-4 F): Days with min	46	90	1955	41
-30 C (-22 F): Days with min	46	51	1936	11
-40 C (-40 F): Days with min	15	11	1936	1
20 C (68 F): Tropical nights (min	16	4	1936	2
10 mm (0.39 in): Days with 10 mm or more rain	45	22	1975	15
25 mm (0.98 in): Days with 25 mm or more rain	40	7	1975	4
50 mm (1.97 in): Days with 50 mm or more rain	10	2	1971	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1935	1
10 cm (3.9 in): Days with 10 cm or more snowfall	38	8	1956	2
25 cm (9.8 in): Days with 25 cm or more snowfall	2	2	1976	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1933.

Download the Data

Data for Pierson 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).

Pierson Threshold Days by Year (CA005012080)

Key Facts for Pierson Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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