Arizona Threshold Days by Year (BR037783080)

4 fixed thresholds counted per year at Arizona (BR037783080): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Arizona Thresholds

Arizona: days with 10 mm (0.39 in) or more of precipitation in 43 years, most in 1974 with 31.
Arizona: days with 25 mm (0.98 in) or more of precipitation in 37 years, most in 1974 with 15.
Arizona: days with 50 mm (1.97 in) or more of precipitation in 25 years, most in 1963 with 4.
Arizona: days with 100 mm (3.94 in) or more of precipitation in 1 years, most in 1957 with 1.
4 fixed thresholds have at least one qualifying day at Arizona.

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

43 years with a qualifying day

Days per year at Arizona with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 31 in 1974.

Days with 10 mm (0.39 in) or more of precipitation per year at Arizona
Year	Days	Decade average
1935	12	12
1936	13	12
1937	19	12
1938	10	12
1939	6	12
1940	21	9.7
1941	3	9.7
1942	7	9.7
1943	7	9.7
1944	3	9.7
1945	4	9.7
1946	5	9.7
1947	20	9.7
1948	16	9.7
1949	11	9.7
1950	15	14.5
1951	14	14.5
1952	16	14.5
1953	12	14.5
1954	20	14.5
1955	13	14.5
1956	7	14.5
1957	19	14.5
1963	16	17.3
1964	21	17.3
1965	12	17.3
1966	16	17.3
1967	23	17.3
1968	13	17.3
1969	20	17.3
1970	13	19
1971	17	19
1972	21	19
1973	17	19
1974	31	19
1975	13	19
1976	16	19
1978	22	19
1979	21	19
1980	15	13.3
1981	13	13.3
1982	13	13.3
1983	12	13.3

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

First to last qualifying date each year at Arizona
Year	First date	Last date
1935	1935-03-19	1935-12-30
1936	1936-01-01	1936-12-08
1937	1937-01-14	1937-12-28
1938	1938-01-14	1938-12-07
1939	1939-01-19	1939-12-13
1940	1940-01-24	1940-11-04
1941	1941-02-04	1941-12-05
1942	1942-01-04	1942-12-05
1943	1943-02-04	1943-12-24
1944	1944-01-18	1944-12-14
1945	1945-03-13	1945-04-06
1946	1946-01-25	1946-11-17
1947	1947-01-25	1947-12-29
1948	1948-02-14	1948-12-24
1949	1949-01-27	1949-12-19
1950	1950-01-24	1950-12-26
1951	1951-01-09	1951-12-16
1952	1952-01-03	1952-12-21
1953	1953-02-15	1953-12-18
1954	1954-01-01	1954-12-28
1955	1955-01-03	1955-12-22
1956	1956-02-09	1956-12-27
1957	1957-01-09	1957-12-24
1963	1963-01-23	1963-12-24
1964	1964-01-11	1964-12-19
1965	1965-02-08	1965-11-23
1966	1966-01-30	1966-12-23
1967	1967-01-29	1967-12-29
1968	1968-02-19	1968-11-26
1969	1969-01-22	1969-12-29
1970	1970-01-12	1970-12-04
1971	1971-01-17	1971-12-22
1972	1972-01-19	1972-12-26
1973	1973-02-25	1973-12-27
1974	1974-01-14	1974-12-29
1975	1975-01-23	1975-12-16
1976	1976-01-27	1976-12-21
1978	1978-01-01	1978-11-30
1979	1979-01-15	1979-12-29
1980	1980-01-05	1980-11-16
1981	1981-01-19	1981-12-30
1982	1982-01-15	1982-12-27
1983	1983-01-21	1983-11-29

Every Fixed Threshold

Fixed thresholds at Arizona
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	43	31	1974	12
25 mm (0.98 in): Days with 25 mm or more rain	37	15	1974	2
50 mm (1.97 in): Days with 50 mm or more rain	25	4	1963	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1957	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1935.

Download the Data

Data for Arizona 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).

Arizona Threshold Days by Year (BR037783080)

Key Facts for Arizona Thresholds

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

Every Fixed Threshold

Download the Data

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