Island Grove Threshold Days by Year (USC00084327)

4 fixed thresholds counted per year at Island Grove (USC00084327): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Island Grove Thresholds

Island Grove: days with 10 mm (0.39 in) or more of precipitation in 29 years, most in 1960 with 55.
Island Grove: days with 25 mm (0.98 in) or more of precipitation in 29 years, most in 1968 with 22.
Island Grove: days with 50 mm (1.97 in) or more of precipitation in 28 years, most in 1964 with 13.
Island Grove: days with 100 mm (3.94 in) or more of precipitation in 9 years, most in 1964 with 2.
4 fixed thresholds have at least one qualifying day at Island Grove.

Days with 10 mm (0.39 in) or more of precipitation

29 years with a qualifying day

Days per year at Island Grove with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 55 in 1960.

Days with 10 mm (0.39 in) or more of precipitation per year at Island Grove
Year	Days	Decade average
1948	45	41
1949	37	41
1950	46	42
1951	42	42
1952	39	42
1953	42	42
1956	31	42
1957	45	42
1958	44	42
1959	47	42
1960	55	39.7
1961	40	39.7
1962	24	39.7
1963	32	39.7
1964	40	39.7
1965	50	39.7
1966	45	39.7
1967	29	39.7
1968	39	39.7
1969	43	39.7
1970	46	39.1
1971	37	39.1
1972	40	39.1
1973	39	39.1
1974	41	39.1
1975	42	39.1
1976	40	39.1
1977	30	39.1
1978	37	39.1

For each year, a bar from the first to the last day at Island Grove meeting 10 mm (0.39 in).

First to last qualifying date each year at Island Grove
Year	First date	Last date
1948	1948-01-18	1948-12-20
1949	1949-01-29	1949-11-15
1950	1950-02-23	1950-12-31
1951	1951-02-02	1951-12-27
1952	1952-01-29	1952-12-31
1953	1953-01-09	1953-11-25
1956	1956-01-17	1956-10-17
1957	1957-01-17	1957-12-09
1958	1958-01-07	1958-12-27
1959	1959-01-02	1959-12-13
1960	1960-01-02	1960-12-21
1961	1961-01-01	1961-12-28
1962	1962-01-07	1962-12-26
1963	1963-01-21	1963-12-31
1964	1964-01-07	1964-12-27
1965	1965-01-04	1965-12-20
1966	1966-01-06	1966-12-24
1967	1967-01-04	1967-12-28
1968	1968-02-19	1968-12-29
1969	1969-01-01	1969-12-26
1970	1970-01-02	1970-12-31
1971	1971-01-07	1971-12-21
1972	1972-01-06	1972-12-22
1973	1973-01-11	1973-12-27
1974	1974-01-30	1974-12-16
1975	1975-01-11	1975-12-30
1976	1976-01-01	1976-12-31
1977	1977-01-03	1977-12-29
1978	1978-01-09	1978-11-30

Every Fixed Threshold

Fixed thresholds at Island Grove
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
10 mm (0.39 in): Days with 10 mm or more rain	29	55	1960	37
25 mm (0.98 in): Days with 25 mm or more rain	29	22	1968	19
50 mm (1.97 in): Days with 50 mm or more rain	28	13	1964	6
100 mm (3.94 in): Days with 100 mm or more rain	9	2	1964	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1948.

Download the Data

Data for Island Grove 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).

Island Grove Threshold Days by Year (USC00084327)

Key Facts for Island Grove Thresholds

Days with 10 mm (0.39 in) or more of precipitation

Every Fixed Threshold

Download the Data

Related