Morris Plains 1 W Threshold Days by Year (USC00285769)

18 fixed thresholds counted per year at Morris Plains 1 W (USC00285769): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Morris Plains 1 W Thresholds

Morris Plains 1 W: days with 10 mm (0.39 in) or more of precipitation in 47 years, most in 1983 with 58.
Morris Plains 1 W: days with 25 mm (0.98 in) or more of precipitation in 47 years, most in 1942 with 23.
Morris Plains 1 W: days with 50 mm (1.97 in) or more of precipitation in 44 years, most in 1973 with 7.
Morris Plains 1 W: days with a maximum temperature at or above 30 C (86 F) in 43 years, most in 1949 with 59.
18 fixed thresholds have at least one qualifying day at Morris Plains 1 W.

Days at or above 30 C (86 F)

43 years with a qualifying day

Days per year at Morris Plains 1 W with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 59 in 1949.

Days at or above 30 C (86 F) per year at Morris Plains 1 W
Year	Days	Decade average
1946	31	42.5
1947	45	42.5
1948	35	42.5
1949	59	42.5
1950	31	40.9
1951	36	40.9
1953	45	40.9
1954	32	40.9
1955	55	40.9
1956	32	40.9
1957	54	40.9
1958	26	40.9
1959	57	40.9
1960	20	33.9
1961	44	33.9
1962	41	33.9
1963	27	33.9
1964	38	33.9
1965	41	33.9
1966	45	33.9
1967	17	33.9
1968	35	33.9
1969	31	33.9
1970	44	31.7
1971	32	31.7
1972	26	31.7
1973	44	31.7
1974	24	31.7
1975	26	31.7
1976	30	31.7
1977	32	31.7
1978	30	31.7
1979	29	31.7
1980	47	34
1981	21	34
1982	5	34
1983	52	34
1984	35	34
1985	36	34
1986	26	34
1987	39	34
1988	51	34
1989	28	34

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

First to last qualifying date each year at Morris Plains 1 W
Year	First date	Last date
1946	1946-06-08	1946-10-06
1947	1947-05-29	1947-09-20
1948	1948-05-13	1948-09-19
1949	1949-05-05	1949-10-10
1950	1950-06-07	1950-10-01
1951	1951-05-16	1951-09-12
1953	1953-05-12	1953-09-06
1954	1954-06-02	1954-10-14
1955	1955-05-06	1955-08-23
1956	1956-05-13	1956-08-30
1957	1957-05-13	1957-09-14
1958	1958-07-01	1958-09-27
1959	1959-05-13	1959-10-07
1960	1960-04-26	1960-09-02
1961	1961-06-07	1961-09-25
1962	1962-04-28	1962-09-02
1963	1963-06-19	1963-08-24
1964	1964-05-10	1964-09-24
1965	1965-05-05	1965-09-23
1966	1966-06-06	1966-09-03
1967	1967-06-05	1967-08-19
1968	1968-06-07	1968-09-23
1969	1969-05-30	1969-09-08
1970	1970-05-10	1970-09-27
1971	1971-06-05	1971-09-10
1972	1972-07-03	1972-09-18
1973	1973-06-05	1973-09-06
1974	1974-04-30	1974-08-31
1975	1975-05-21	1975-08-26
1976	1976-04-18	1976-09-15
1977	1977-04-13	1977-09-04
1978	1978-05-21	1978-08-30
1979	1979-05-10	1979-10-23
1980	1980-05-06	1980-09-23
1981	1981-06-17	1981-08-15
1982	1982-06-17	1982-09-13
1983	1983-06-12	1983-09-21
1984	1984-06-05	1984-09-04
1985	1985-04-20	1985-09-21
1986	1986-05-07	1986-10-01
1987	1987-05-11	1987-08-20
1988	1988-05-30	1988-08-18
1989	1989-05-19	1989-09-12

Every Fixed Threshold

Fixed thresholds at Morris Plains 1 W
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	43	59	1949	28
35 C (95 F): Days	26	17	1955	8
90 F (32.2 C): Days	42	37	1949	12
100 F (37.8 C): Days	7	3	1955	2
0 C (32 F): Ice days (max	43	40	1963	34
0 C (32 F): Frost days (min	42	156	1989	156
-10 C (14 F): Days with min	42	48	1989	48
-20 C (-4 F): Days with min	23	9	1961	3
20 C (68 F): Tropical nights (min	42	30	1949	1
25 C (77 F): Days with min	2	2	1949	2
10 mm (0.39 in): Days with 10 mm or more rain	47	58	1983	45
25 mm (0.98 in): Days with 25 mm or more rain	47	23	1942	19
50 mm (1.97 in): Days with 50 mm or more rain	44	7	1973	4
100 mm (3.94 in): Days with 100 mm or more rain	9	2	1972	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1971	1
10 cm (3.9 in): Days with 10 cm or more snowfall	39	7	1966	2
25 cm (9.8 in): Days with 25 cm or more snowfall	11	2	1958	1
50 cm (19.7 in): Days with 50 cm or more snowfall	2	1	1956	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1946.

Download the Data

Data for Morris Plains 1 W 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Morris Plains 1 W Threshold Days by Year (USC00285769)

Key Facts for Morris Plains 1 W Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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