Hanna Threshold Days by Year (USC00423624)

14 fixed thresholds counted per year at Hanna (USC00423624): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Hanna Thresholds

Hanna: days with a maximum temperature at or above 30 C (86 F) in 33 years, most in 2021 with 37.
Hanna: days with a maximum temperature at or below 0 C (32 F) in 33 years, most in 1955 with 73.
Hanna: days with 10 mm (0.39 in) or more of precipitation in 30 years, most in 1987 with 17.
Hanna: nights with a minimum temperature at or below 0 C (32 F) in 29 years, most in 1971 with 226.
14 fixed thresholds have at least one qualifying day at Hanna.

Days at or above 30 C (86 F)

33 years with a qualifying day

Days per year at Hanna with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 37 in 2021.

Days at or above 30 C (86 F) per year at Hanna
Year	Days	Decade average
1954	22	11.8
1955	23	11.8
1956	1	11.8
1957	3	11.8
1958	12	11.8
1959	10	11.8
1960	24	15.5
1961	14	15.5
1962	13	15.5
1963	11	15.5
1964	22	15.5
1965	4	15.5
1966	18	15.5
1967	12	15.5
1968	12	15.5
1969	25	15.5
1970	25	19.9
1971	22	19.9
1972	17	19.9
1973	22	19.9
1974	25	19.9
1975	10	19.9
1976	22	19.9
1977	18	19.9
1978	18	19.9
1986	8	6
1987	4	6
2021	37	30.8
2022	35	30.8
2023	17	30.8
2024	32	30.8
2025	25	30.8
2026	39	30.8

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

First to last qualifying date each year at Hanna
Year	First date	Last date
1954	1954-06-22	1954-09-01
1955	1955-06-20	1955-09-05
1956	1956-07-27	1956-07-27
1957	1957-07-09	1957-08-03
1958	1958-06-27	1958-08-20
1959	1959-06-18	1959-08-10
1960	1960-06-24	1960-08-21
1961	1961-06-17	1961-08-19
1962	1962-06-25	1962-08-16
1963	1963-07-01	1963-08-14
1964	1964-07-07	1964-08-18
1965	1965-07-28	1965-08-09
1966	1966-06-19	1966-08-18
1967	1967-07-13	1967-09-05
1968	1968-06-19	1968-07-29
1969	1969-07-02	1969-09-28
1970	1970-06-24	1970-08-24
1971	1971-06-21	1971-08-20
1972	1972-07-08	1972-08-12
1973	1973-06-09	1973-08-20
1974	1974-05-12	1974-09-10
1975	1975-07-02	1975-08-12
1976	1976-06-21	1976-08-14
1977	1977-06-04	1977-09-07
1978	1978-06-21	1978-08-10
1986	1986-06-05	1986-08-18
1987	1987-07-15	1987-08-05
2021	2021-06-04	2021-09-10
2022	2022-06-11	2022-09-09
2023	2023-07-10	2023-08-17
2024	2024-06-07	2024-08-11
2025	2025-06-16	2025-09-03
2026	2026-06-24	2026-08-22

Every Fixed Threshold

Fixed thresholds at Hanna
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	33	37	2021	39
35 C (95 F): Days	6	1	1954	1
90 F (32.2 C): Days	27	14	2021	15
0 C (32 F): Ice days (max	33	73	1955	6
0 C (32 F): Frost days (min	29	226	1971	79
-10 C (14 F): Days with min	29	102	1973	55
-20 C (-4 F): Days with min	28	25	1966	9
-30 C (-22 F): Days with min	7	2	1963	3
20 C (68 F): Tropical nights (min	1	1	1986	1
10 mm (0.39 in): Days with 10 mm or more rain	30	17	1987	6
25 mm (0.98 in): Days with 25 mm or more rain	16	2	1957	2
10 cm (3.9 in): Days with 10 cm or more snowfall	28	8	1955	2
25 cm (9.8 in): Days with 25 cm or more snowfall	11	2	1955	2
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1962	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1954.

Download the Data

Data for Hanna 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).

Hanna Threshold Days by Year (USC00423624)

Key Facts for Hanna Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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