Grafton Threshold Days by Year (USC00273530)

17 fixed thresholds counted per year at Grafton (USC00273530): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Grafton Thresholds

Grafton: days with 10 mm (0.39 in) or more of precipitation in 69 years, most in 1902 with 48.
Grafton: days with 25 mm (0.98 in) or more of precipitation in 69 years, most in 1900 with 16.
Grafton: days with 10 cm (3.9 in) or more of snowfall in 65 years, most in 1956 with 16.
Grafton: nights with a minimum temperature at or below 0 C (32 F) in 63 years, most in 1956 with 222.
17 fixed thresholds have at least one qualifying day at Grafton.

Days at or above 30 C (86 F)

62 years with a qualifying day

Days per year at Grafton with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 31 in 2002.

Days at or above 30 C (86 F) per year at Grafton
Year	Days	Decade average
1896	26	18.3
1897	6	18.3
1899	23	18.3
1900	28	15.7
1901	24	15.7
1902	9	15.7
1903	9	15.7
1904	9	15.7
1905	13	15.7
1907	14	15.7
1908	19	15.7
1909	16	15.7
1910	12	14.7
1911	24	14.7
1912	13	14.7
1914	17	14.7
1915	9	14.7
1916	13	14.7
1956	10	15.3
1957	17	15.3
1958	6	15.3
1959	28	15.3
1960	7	12.6
1961	18	12.6
1962	9	12.6
1963	22	12.6
1964	16	12.6
1965	18	12.6
1966	13	12.6
1967	5	12.6
1968	10	12.6
1969	8	12.6
1970	23	15.7
1971	15	15.7
1972	10	15.7
1976	14	15.7
1977	13	15.7
1978	18	15.7
1979	17	15.7
1980	13	12.6
1981	6	12.6
1982	8	12.6
1983	23	12.6
1984	14	12.6
1985	7	12.6
1986	6	12.6
1987	16	12.6
1988	26	12.6
1989	7	12.6
1990	11	13.1
1991	16	13.1
1992	5	13.1
1993	17	13.1
1994	12	13.1
1995	14	13.1
1996	7	13.1
1997	14	13.1
1998	10	13.1
1999	25	13.1
2000	9	21.7
2001	25	21.7
2002	31	21.7

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

First to last qualifying date each year at Grafton
Year	First date	Last date
1896	1896-05-09	1896-09-12
1897	1897-07-05	1897-09-10
1899	1899-05-01	1899-08-31
1900	1900-05-15	1900-09-06
1901	1901-05-22	1901-09-07
1902	1902-05-23	1902-09-01
1903	1903-05-17	1903-09-15
1904	1904-06-05	1904-08-01
1905	1905-06-16	1905-08-11
1907	1907-06-18	1907-08-20
1908	1908-05-26	1908-09-27
1909	1909-06-21	1909-08-25
1910	1910-06-21	1910-07-27
1911	1911-05-11	1911-08-15
1912	1912-06-24	1912-07-15
1914	1914-05-26	1914-09-23
1915	1915-06-14	1915-09-17
1916	1916-07-12	1916-08-23
1956	1956-06-12	1956-08-18
1957	1957-06-11	1957-09-22
1958	1958-06-30	1958-08-31
1959	1959-05-27	1959-09-09
1960	1960-06-17	1960-09-08
1961	1961-05-14	1961-09-24
1962	1962-04-27	1962-08-06
1963	1963-06-24	1963-10-07
1964	1964-05-07	1964-07-29
1965	1965-05-10	1965-09-22
1966	1966-06-06	1966-08-08
1967	1967-06-04	1967-06-17
1968	1968-06-06	1968-08-25
1969	1969-06-12	1969-08-16
1970	1970-05-01	1970-09-22
1971	1971-06-07	1971-09-05
1972	1972-05-29	1972-08-25
1976	1976-04-19	1976-08-22
1977	1977-05-17	1977-08-29
1978	1978-05-28	1978-09-21
1979	1979-05-09	1979-08-05
1980	1980-06-24	1980-09-02
1981	1981-05-25	1981-08-11
1982	1982-07-07	1982-09-12
1983	1983-06-13	1983-09-21
1984	1984-06-08	1984-08-15
1985	1985-07-21	1985-08-15
1986	1986-05-18	1986-07-25
1987	1987-05-30	1987-08-18
1988	1988-06-13	1988-08-14
1989	1989-05-19	1989-09-10
1990	1990-04-27	1990-08-27
1991	1991-05-17	1991-08-31
1992	1992-05-22	1992-08-28
1993	1993-05-12	1993-09-16
1994	1994-05-23	1994-07-26
1995	1995-06-19	1995-08-22
1996	1996-05-21	1996-08-08
1997	1997-06-11	1997-08-17
1998	1998-05-30	1998-08-09
1999	1999-05-31	1999-09-05
2000	2000-05-08	2000-09-02
2001	2001-05-03	2001-09-10
2002	2002-04-17	2002-09-11

Every Fixed Threshold

Fixed thresholds at Grafton
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	62	31	2002	31
35 C (95 F): Days	17	5	1911	3
90 F (32.2 C): Days	53	20	2002	20
0 C (32 F): Ice days (max	62	92	1904	48
0 C (32 F): Frost days (min	63	222	1956	153
-10 C (14 F): Days with min	63	98	1978	72
-20 C (-4 F): Days with min	63	40	1962	40
-30 C (-22 F): Days with min	47	9	1963	6
-40 C (-40 F): Days with min	1	2	1994	2
20 C (68 F): Tropical nights (min	30	5	1979	6
10 mm (0.39 in): Days with 10 mm or more rain	69	48	1902	31
25 mm (0.98 in): Days with 25 mm or more rain	69	16	1900	10
50 mm (1.97 in): Days with 50 mm or more rain	39	4	1962	1
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1959	1
10 cm (3.9 in): Days with 10 cm or more snowfall	65	16	1956	7
25 cm (9.8 in): Days with 25 cm or more snowfall	38	3	1900	1
50 cm (19.7 in): Days with 50 cm or more snowfall	3	1	1994	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1896.

Download the Data

Data for Grafton 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).

Grafton Threshold Days by Year (USC00273530)

Key Facts for Grafton Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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