Merrill Threshold Days by Year (USC00225789)

17 fixed thresholds counted per year at Merrill (USC00225789): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Merrill Thresholds

Merrill: days with 10 mm (0.39 in) or more of precipitation in 85 years, most in 1961 with 65.
Merrill: days with 25 mm (0.98 in) or more of precipitation in 85 years, most in 1911 with 33.
Merrill: days with 50 mm (1.97 in) or more of precipitation in 85 years, most in 1912 with 16.
Merrill: days with 100 mm (3.94 in) or more of precipitation in 51 years, most in 1961 with 5.
17 fixed thresholds have at least one qualifying day at Merrill.

Days at or above 30 C (86 F)

40 years with a qualifying day

Days per year at Merrill with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 172 in 1955.

Days at or above 30 C (86 F) per year at Merrill
Year	Days	Decade average
1955	172	140.4
1956	135	140.4
1957	134	140.4
1958	127	140.4
1959	134	140.4
1960	143	146.9
1961	120	146.9
1962	160	146.9
1963	170	146.9
1964	143	146.9
1965	160	146.9
1966	134	146.9
1967	144	146.9
1968	151	146.9
1969	144	146.9
1970	143	136.4
1971	144	136.4
1972	160	136.4
1973	139	136.4
1974	127	136.4
1975	123	136.4
1976	117	136.4
1977	143	136.4
1978	144	136.4
1979	124	136.4
1980	136	136.2
1982	156	136.2
1983	103	136.2
1984	141	136.2
1985	134	136.2
1986	146	136.2
1987	140	136.2
1988	132	136.2
1989	138	136.2
1990	140	125.7
1991	138	125.7
1994	118	125.7
1995	141	125.7
1996	96	125.7
1997	121	125.7

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

First to last qualifying date each year at Merrill
Year	First date	Last date
1955	1955-03-06	1955-11-15
1956	1956-04-05	1956-11-04
1957	1957-02-05	1957-09-23
1958	1958-04-19	1958-11-19
1959	1959-04-07	1959-10-14
1960	1960-04-08	1960-10-19
1961	1961-04-29	1961-11-01
1962	1962-03-22	1962-10-21
1963	1963-03-18	1963-10-29
1964	1964-04-19	1964-10-19
1965	1965-04-05	1965-10-18
1966	1966-04-01	1966-10-16
1967	1967-03-12	1967-10-15
1968	1968-04-20	1968-10-16
1969	1969-04-04	1969-10-14
1970	1970-04-08	1970-10-13
1971	1971-04-12	1971-12-18
1972	1972-03-24	1972-11-04
1973	1973-05-09	1973-10-12
1974	1974-03-11	1974-10-15
1975	1975-04-26	1975-10-24
1976	1976-04-13	1976-10-06
1977	1977-03-19	1977-10-09
1978	1978-04-01	1978-10-26
1979	1979-04-17	1979-10-31
1980	1980-04-23	1980-10-18
1982	1982-03-16	1982-11-03
1983	1983-05-07	1983-10-22
1984	1984-04-29	1984-11-01
1985	1985-03-31	1985-10-24
1986	1986-04-05	1986-11-09
1987	1987-04-19	1987-10-20
1988	1988-04-06	1988-10-02
1989	1989-03-13	1989-10-08
1990	1990-05-01	1990-10-18
1991	1991-03-26	1991-10-15
1994	1994-04-28	1994-10-08
1995	1995-03-22	1995-10-20
1996	1996-04-28	1996-10-29
1997	1997-04-21	1997-10-14

Every Fixed Threshold

Fixed thresholds at Merrill
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	40	172	1955	121
35 C (95 F): Days	40	73	1963	24
40 C (104 F): Days	4	4	1963	1
90 F (32.2 C): Days	40	140	1963	95
100 F (37.8 C): Days	19	16	1969	7
0 C (32 F): Ice days (max	8	4	1963	1
0 C (32 F): Frost days (min	40	89	1963	44
-10 C (14 F): Days with min	16	7	1962	3
-20 C (-4 F): Days with min	1	1	1985	1
20 C (68 F): Tropical nights (min	40	108	1959	83
25 C (77 F): Days with min	1	1	1962	1
10 mm (0.39 in): Days with 10 mm or more rain	85	65	1961	60
25 mm (0.98 in): Days with 25 mm or more rain	85	33	1911	23
50 mm (1.97 in): Days with 50 mm or more rain	85	16	1912	11
100 mm (3.94 in): Days with 100 mm or more rain	51	5	1961	2
200 mm (7.87 in): Days with 200 mm or more rain	4	1	1948	1
10 cm (3.9 in): Days with 10 cm or more snowfall	2	1	1964	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1955.

Download the Data

Data for Merrill 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).

Merrill Threshold Days by Year (USC00225789)

Key Facts for Merrill Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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