Mayo A Threshold Days by Year (CA002100700)

13 fixed thresholds counted per year at Mayo A (CA002100700): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mayo A Thresholds

Mayo A: nights with a minimum temperature at or below 0 C (32 F) in 57 years, most in 1935 with 258.
Mayo A: nights with a minimum temperature at or below -10 C (14 F) in 57 years, most in 1972 with 180.
Mayo A: nights with a minimum temperature at or below -20 C (-4 F) in 57 years, most in 1932 with 122.
Mayo A: nights with a minimum temperature at or below -30 C (-22 F) in 57 years, most in 1932 with 88.
13 fixed thresholds have at least one qualifying day at Mayo A.

Days at or above 30 C (86 F)

26 years with a qualifying day

Days per year at Mayo A with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 6 in 1969.

Days at or above 30 C (86 F) per year at Mayo A
Year	Days	Decade average
1925	4	4
1934	1	2.3
1936	3	2.3
1937	4	2.3
1939	1	2.3
1940	1	1.8
1942	1	1.8
1946	1	1.8
1947	4	1.8
1948	2	1.8
1950	2	1.6
1951	2	1.6
1953	1	1.6
1955	1	1.6
1958	2	1.6
1961	2	2.5
1965	1	2.5
1967	1	2.5
1969	6	2.5
1972	2	2.8
1975	3	2.8
1976	4	2.8
1977	1	2.8
1978	4	2.8
1980	2	3
1983	4	3

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

First to last qualifying date each year at Mayo A
Year	First date	Last date
1925	1925-07-23	1925-07-26
1934	1934-07-29	1934-07-29
1936	1936-05-31	1936-06-02
1937	1937-06-08	1937-06-11
1939	1939-07-20	1939-07-20
1940	1940-07-12	1940-07-12
1942	1942-07-03	1942-07-03
1946	1946-06-09	1946-06-09
1947	1947-05-27	1947-07-19
1948	1948-06-14	1948-06-15
1950	1950-06-17	1950-06-18
1951	1951-07-09	1951-07-20
1953	1953-08-03	1953-08-03
1955	1955-07-24	1955-07-24
1958	1958-06-20	1958-07-04
1961	1961-07-27	1961-07-28
1965	1965-07-11	1965-07-11
1967	1967-06-19	1967-06-19
1969	1969-06-09	1969-06-16
1972	1972-06-13	1972-06-15
1975	1975-07-08	1975-07-12
1976	1976-07-30	1976-08-02
1977	1977-08-05	1977-08-05
1978	1978-07-08	1978-08-01
1980	1980-06-06	1980-06-07
1983	1983-05-30	1983-07-01

Every Fixed Threshold

Fixed thresholds at Mayo A
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	26	6	1969	4
35 C (95 F): Days	3	3	1969	3
90 F (32.2 C): Days	10	4	1969	2
0 C (32 F): Ice days (max	55	166	1972	166
0 C (32 F): Frost days (min	57	258	1935	238
-10 C (14 F): Days with min	57	180	1972	146
-20 C (-4 F): Days with min	57	122	1932	82
-30 C (-22 F): Days with min	57	88	1932	50
-40 C (-40 F): Days with min	57	51	1933	32
10 mm (0.39 in): Days with 10 mm or more rain	54	12	1932	4
25 mm (0.98 in): Days with 25 mm or more rain	7	2	1939	2
10 cm (3.9 in): Days with 10 cm or more snowfall	39	7	1932	2
25 cm (9.8 in): Days with 25 cm or more snowfall	2	2	1949	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1925.

Download the Data

Data for Mayo A 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Mayo A Threshold Days by Year (CA002100700)

Key Facts for Mayo A Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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