Rockland Threshold Days by Year (USC00177250)

16 fixed thresholds counted per year at Rockland (USC00177250): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rockland Thresholds

Rockland: days with a maximum temperature at or above 30 C (86 F) in 38 years, most in 1948 with 23.
Rockland: days with a maximum temperature at or below 0 C (32 F) in 38 years, most in 1970 with 61.
Rockland: nights with a minimum temperature at or below 0 C (32 F) in 38 years, most in 1943 with 183.
Rockland: nights with a minimum temperature at or below -10 C (14 F) in 38 years, most in 1940 with 67.
16 fixed thresholds have at least one qualifying day at Rockland.

Days at or above 30 C (86 F)

38 years with a qualifying day

Days per year at Rockland with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 23 in 1948.

Days at or above 30 C (86 F) per year at Rockland
Year	Days	Decade average
1938	12	9.5
1939	7	9.5
1940	4	13.1
1941	15	13.1
1942	6	13.1
1943	11	13.1
1944	18	13.1
1945	8	13.1
1946	12	13.1
1947	16	13.1
1948	23	13.1
1949	18	13.1
1950	9	9.5
1951	4	9.5
1952	22	9.5
1953	14	9.5
1954	3	9.5
1955	21	9.5
1956	6	9.5
1957	4	9.5
1958	2	9.5
1959	10	9.5
1960	5	5.6
1961	7	5.6
1962	2	5.6
1963	8	5.6
1964	3	5.6
1965	6	5.6
1966	4	5.6
1967	4	5.6
1968	9	5.6
1969	8	5.6
1970	10	5.7
1971	7	5.7
1972	1	5.7
1973	7	5.7
1974	1	5.7
1975	8	5.7

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

First to last qualifying date each year at Rockland
Year	First date	Last date
1938	1938-06-21	1938-08-23
1939	1939-07-04	1939-09-16
1940	1940-05-27	1940-07-26
1941	1941-06-19	1941-09-22
1942	1942-06-10	1942-09-02
1943	1943-06-24	1943-08-02
1944	1944-05-31	1944-08-16
1945	1945-06-14	1945-09-08
1946	1946-06-24	1946-09-20
1947	1947-06-28	1947-10-18
1948	1948-06-25	1948-09-06
1949	1949-06-19	1949-08-28
1950	1950-06-08	1950-08-18
1951	1951-07-07	1951-08-30
1952	1952-06-23	1952-08-29
1953	1953-06-20	1953-09-02
1954	1954-06-23	1954-08-25
1955	1955-06-19	1955-09-18
1956	1956-06-13	1956-08-19
1957	1957-06-16	1957-07-20
1958	1958-07-02	1958-07-24
1959	1959-05-22	1959-08-16
1960	1960-06-27	1960-09-08
1961	1961-06-13	1961-09-12
1962	1962-05-31	1962-07-08
1963	1963-06-24	1963-08-22
1964	1964-05-24	1964-07-27
1965	1965-06-29	1965-09-22
1966	1966-06-27	1966-08-19
1967	1967-06-16	1967-08-19
1968	1968-06-06	1968-08-26
1969	1969-06-28	1969-09-01
1970	1970-07-23	1970-08-16
1971	1971-06-30	1971-09-09
1972	1972-05-28	1972-05-28
1973	1973-07-08	1973-09-03
1974	1974-06-09	1974-06-09
1975	1975-06-23	1975-08-14

Every Fixed Threshold

Fixed thresholds at Rockland
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	38	23	1948	8
35 C (95 F): Days	11	5	1948	1
90 F (32.2 C): Days	30	14	1944	3
0 C (32 F): Ice days (max	38	61	1970	32
0 C (32 F): Frost days (min	38	183	1943	150
-10 C (14 F): Days with min	38	67	1940	43
-20 C (-4 F): Days with min	36	15	1948	7
-30 C (-22 F): Days with min	1	1	1943	1
20 C (68 F): Tropical nights (min	8	5	1952	1
25 C (77 F): Days with min	1	1	1938	1
10 mm (0.39 in): Days with 10 mm or more rain	38	59	1958	46
25 mm (0.98 in): Days with 25 mm or more rain	38	23	1953	19
50 mm (1.97 in): Days with 50 mm or more rain	28	5	1943	4
100 mm (3.94 in): Days with 100 mm or more rain	5	1	1951	1
10 cm (3.9 in): Days with 10 cm or more snowfall	35	11	1956	4
25 cm (9.8 in): Days with 25 cm or more snowfall	14	2	1952	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1938.

Download the Data

Data for Rockland 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).

Rockland Threshold Days by Year (USC00177250)

Key Facts for Rockland Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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