Millbrook Threshold Days by Year (USC00305334)

19 fixed thresholds counted per year at Millbrook (USC00305334): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Millbrook Thresholds

Millbrook: days with 10 mm (0.39 in) or more of precipitation in 47 years, most in 1972 with 51.
Millbrook: days with 25 mm (0.98 in) or more of precipitation in 47 years, most in 1979 with 15.
Millbrook: nights with a minimum temperature at or below 0 C (32 F) in 42 years, most in 1978 with 169.
Millbrook: nights with a minimum temperature at or below -10 C (14 F) in 42 years, most in 1970 with 65.
19 fixed thresholds have at least one qualifying day at Millbrook.

Days at or above 30 C (86 F)

39 years with a qualifying day

Days per year at Millbrook with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 47 in 1983.

Days at or above 30 C (86 F) per year at Millbrook
Year	Days	Decade average
1944	38	30.5
1947	27	30.5
1948	22	30.5
1949	35	30.5
1950	10	20.2
1951	9	20.2
1952	21	20.2
1953	30	20.2
1954	13	20.2
1955	40	20.2
1956	11	20.2
1957	32	20.2
1958	4	20.2
1959	32	20.2
1960	1	16.9
1961	33	16.9
1962	7	16.9
1963	17	16.9
1964	25	16.9
1965	21	16.9
1966	27	16.9
1967	7	16.9
1968	17	16.9
1969	14	16.9
1970	15	12.6
1971	8	12.6
1972	17	12.6
1973	17	12.6
1974	12	12.6
1975	13	12.6
1977	14	12.6
1978	5	12.6
1979	12	12.6
1980	17	21.4
1983	47	21.4
1985	8	21.4
1986	10	21.4
1987	25	21.4
1999	39	39

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

First to last qualifying date each year at Millbrook
Year	First date	Last date
1944	1944-05-04	1944-10-07
1947	1947-06-11	1947-09-14
1948	1948-06-24	1948-09-18
1949	1949-05-05	1949-10-10
1950	1950-06-03	1950-08-18
1951	1951-05-16	1951-08-31
1952	1952-06-15	1952-08-27
1953	1953-05-10	1953-09-04
1954	1954-06-21	1954-08-16
1955	1955-06-17	1955-08-23
1956	1956-06-08	1956-08-18
1957	1957-06-14	1957-09-16
1958	1958-07-01	1958-08-07
1959	1959-05-20	1959-09-24
1960	1960-08-29	1960-08-29
1961	1961-06-13	1961-09-24
1962	1962-04-27	1962-08-28
1963	1963-05-09	1963-07-29
1964	1964-05-09	1964-09-23
1965	1965-05-26	1965-09-22
1966	1966-06-24	1966-09-02
1967	1967-06-03	1967-06-24
1968	1968-06-06	1968-08-26
1969	1969-05-29	1969-09-02
1970	1970-04-29	1970-09-25
1971	1971-06-24	1971-07-17
1972	1972-07-02	1972-09-19
1973	1973-06-11	1973-09-04
1974	1974-05-22	1974-08-20
1975	1975-05-20	1975-08-05
1977	1977-05-17	1977-09-02
1978	1978-05-31	1978-07-23
1979	1979-05-09	1979-08-06
1980	1980-06-24	1980-09-22
1983	1983-06-12	1983-09-20
1985	1985-07-20	1985-09-07
1986	1986-05-19	1986-09-30
1987	1987-05-29	1987-08-19
1999	1999-05-30	1999-09-05

Every Fixed Threshold

Fixed thresholds at Millbrook
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	39	47	1983	39
35 C (95 F): Days	10	4	1944	4
40 C (104 F): Days	1	1	1944	1
90 F (32.2 C): Days	34	20	1999	20
100 F (37.8 C): Days	1	1	1944	1
0 C (32 F): Ice days (max	39	60	1978	27
0 C (32 F): Frost days (min	42	169	1978	144
-10 C (14 F): Days with min	42	65	1970	31
-20 C (-4 F): Days with min	38	19	1948	1
-30 C (-22 F): Days with min	4	3	1961	1
20 C (68 F): Tropical nights (min	40	24	1957	6
25 C (77 F): Days with min	1	2	1944	2
10 mm (0.39 in): Days with 10 mm or more rain	47	51	1972	33
25 mm (0.98 in): Days with 25 mm or more rain	47	15	1979	4
50 mm (1.97 in): Days with 50 mm or more rain	34	6	1955	2
100 mm (3.94 in): Days with 100 mm or more rain	5	1	1955	1
10 cm (3.9 in): Days with 10 cm or more snowfall	37	8	1958	3
25 cm (9.8 in): Days with 25 cm or more snowfall	12	3	1967	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1961	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1944.

Download the Data

Data for Millbrook 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).

Millbrook Threshold Days by Year (USC00305334)

Key Facts for Millbrook Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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