Hanna Threshold Days by Year (USC00343884)

18 fixed thresholds counted per year at Hanna (USC00343884): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Hanna Thresholds

Hanna: days with 10 mm (0.39 in) or more of precipitation in 52 years, most in 1973 with 51.
Hanna: days with 25 mm (0.98 in) or more of precipitation in 52 years, most in 1973 with 25.
Hanna: days with 50 mm (1.97 in) or more of precipitation in 49 years, most in 1992 with 8.
Hanna: days with a maximum temperature at or above 30 C (86 F) in 40 years, most in 1963 with 144.
18 fixed thresholds have at least one qualifying day at Hanna.

Days at or above 30 C (86 F)

40 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 144 in 1963.

Days at or above 30 C (86 F) per year at Hanna
Year	Days	Decade average
1961	87	106.4
1962	121	106.4
1963	144	106.4
1964	107	106.4
1965	106	106.4
1966	98	106.4
1967	91	106.4
1968	87	106.4
1969	117	106.4
1970	106	106
1971	97	106
1972	126	106
1973	100	106
1974	93	106
1975	107	106
1976	93	106
1977	114	106
1978	118	106
1979	106	106
1980	126	109.5
1981	107	109.5
1982	105	109.5
1983	116	109.5
1984	112	109.5
1985	112	109.5
1986	97	109.5
1987	110	109.5
1988	116	109.5
1989	94	109.5
1990	106	98.6
1991	108	98.6
1992	71	98.6
1993	100	98.6
1994	99	98.6
1995	94	98.6
1996	96	98.6
1997	102	98.6
1998	129	98.6
1999	81	98.6
2000	104	104

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
1961	1961-05-06	1961-10-12
1962	1962-02-12	1962-10-15
1963	1963-03-27	1963-10-27
1964	1964-04-02	1964-10-17
1965	1965-04-09	1965-10-17
1966	1966-03-31	1966-10-13
1967	1967-03-11	1967-10-06
1968	1968-04-17	1968-10-30
1969	1969-05-20	1969-10-10
1970	1970-05-19	1970-10-02
1971	1971-05-25	1971-10-11
1972	1972-04-11	1972-10-17
1973	1973-05-10	1973-10-08
1974	1974-03-31	1974-09-11
1975	1975-04-24	1975-10-13
1976	1976-05-22	1976-10-03
1977	1977-05-08	1977-10-27
1978	1978-05-14	1978-10-21
1979	1979-04-25	1979-10-21
1980	1980-04-07	1980-10-10
1981	1981-04-29	1981-10-06
1982	1982-04-14	1982-10-07
1983	1983-05-25	1983-10-05
1984	1984-04-24	1984-10-06
1985	1985-03-28	1985-09-22
1986	1986-05-12	1986-10-02
1987	1987-04-17	1987-09-25
1988	1988-05-11	1988-10-17
1989	1989-04-03	1989-10-14
1990	1990-05-14	1990-10-06
1991	1991-03-05	1991-10-18
1992	1992-05-05	1992-10-13
1993	1993-05-15	1993-10-16
1994	1994-04-20	1994-10-06
1995	1995-03-22	1995-10-16
1996	1996-02-21	1996-09-12
1997	1997-03-21	1997-10-06
1998	1998-05-12	1998-10-01
1999	1999-04-19	1999-10-15
2000	2000-05-08	2000-10-05

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	40	144	1963	104
35 C (95 F): Days	39	87	1980	51
40 C (104 F): Days	18	18	1980	5
90 F (32.2 C): Days	40	108	1963	77
100 F (37.8 C): Days	32	62	1980	24
0 C (32 F): Ice days (max	39	17	1978	6
0 C (32 F): Frost days (min	39	90	1979	67
-10 C (14 F): Days with min	37	20	1963	3
-20 C (-4 F): Days with min	5	2	1977	2
20 C (68 F): Tropical nights (min	39	103	1998	77
25 C (77 F): Days with min	34	18	1980	2
10 mm (0.39 in): Days with 10 mm or more rain	52	51	1973	35
25 mm (0.98 in): Days with 25 mm or more rain	52	25	1973	18
50 mm (1.97 in): Days with 50 mm or more rain	49	8	1992	7
100 mm (3.94 in): Days with 100 mm or more rain	9	1	1964	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1990	1
10 cm (3.9 in): Days with 10 cm or more snowfall	20	3	1975	1
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1975	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1961.

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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Hanna Threshold Days by Year (USC00343884)

Key Facts for Hanna Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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