Rolla 1NE Threshold Days by Year

18 fixed thresholds counted per year at Rolla 1NE (USC00327664): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rolla 1NE Thresholds

Rolla 1NE: days with 10 mm (0.39 in) or more of precipitation in 71 years, most in 1905 with 21.
Rolla 1NE: days with a maximum temperature at or below 0 C (32 F) in 70 years, most in 1996 with 140.
Rolla 1NE: nights with a minimum temperature at or below 0 C (32 F) in 69 years, most in 1945 with 221.
Rolla 1NE: nights with a minimum temperature at or below -10 C (14 F) in 69 years, most in 1955 with 134.
18 fixed thresholds have at least one qualifying day at Rolla 1NE.

Days at or above 30 C (86 F)

68 years with a qualifying day

Days per year at Rolla 1NE with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 36 in 1939.

Days at or above 30 C (86 F) per year at Rolla 1NE
Year	Days	Decade average
1905	7	7
1938	27	31.5
1939	36	31.5
1940	26	17.9
1941	26	17.9
1942	8	17.9
1943	6	17.9
1944	8	17.9
1945	14	17.9
1946	20	17.9
1947	28	17.9
1948	18	17.9
1949	25	17.9
1950	5	14.3
1951	10	14.3
1952	25	14.3
1953	16	14.3
1954	6	14.3
1955	21	14.3
1956	7	14.3
1957	15	14.3
1958	16	14.3
1959	22	14.3
1960	22	17
1961	34	17
1962	6	17
1963	19	17
1964	12	17
1965	5	17
1966	22	17
1967	23	17
1968	7	17
1969	20	17
1970	27	11.9
1971	11	11.9
1972	11	11.9
1973	6	11.9
1974	9	11.9
1976	12	11.9
1977	9	11.9
1978	12	11.9
1979	10	11.9
1980	15	16.2
1981	4	16.2
1983	20	16.2
1984	19	16.2
1985	5	16.2
1986	10	16.2
1987	17	16.2
1988	33	16.2
1989	23	16.2
1990	10	4.9
1991	8	4.9
1992	5	4.9
1993	2	4.9
1994	2	4.9
1995	12	4.9
1996	4	4.9
1997	2	4.9
1998	2	4.9
1999	2	4.9
2000	1	7.7
2001	4	7.7
2002	4	7.7
2003	11	7.7
2005	3	7.7
2006	18	7.7
2007	13	7.7

For each year, a bar from the first to the last day at Rolla 1NE meeting 30 C (86 F).

First to last qualifying date each year at Rolla 1NE
Year	First date	Last date
1905	1905-06-03	1905-09-27
1938	1938-06-18	1938-09-25
1939	1939-05-05	1939-09-18
1940	1940-05-11	1940-09-05
1941	1941-05-18	1941-09-01
1942	1942-07-11	1942-09-09
1943	1943-07-07	1943-07-31
1944	1944-05-29	1944-08-08
1945	1945-06-21	1945-09-05
1946	1946-05-28	1946-09-14
1947	1947-04-28	1947-09-04
1948	1948-05-19	1948-09-11
1949	1949-06-10	1949-08-25
1950	1950-07-27	1950-09-05
1951	1951-05-23	1951-08-01
1952	1952-04-26	1952-09-27
1953	1953-06-11	1953-09-09
1954	1954-06-23	1954-08-31
1955	1955-07-17	1955-09-05
1956	1956-05-21	1956-08-15
1957	1957-07-06	1957-08-10
1958	1958-06-28	1958-10-13
1959	1959-06-03	1959-09-13
1960	1960-06-25	1960-09-20
1961	1961-05-30	1961-08-29
1962	1962-06-27	1962-08-27
1963	1963-05-30	1963-10-04
1964	1964-05-20	1964-08-09
1965	1965-08-04	1965-08-13
1966	1966-05-21	1966-09-12
1967	1967-06-29	1967-09-05
1968	1968-06-03	1968-08-28
1969	1969-05-26	1969-09-03
1970	1970-05-17	1970-09-19
1971	1971-08-07	1971-09-02
1972	1972-05-17	1972-08-31
1973	1973-06-15	1973-08-19
1974	1974-06-20	1974-08-07
1976	1976-07-10	1976-09-18
1977	1977-05-11	1977-07-23
1978	1978-06-30	1978-09-09
1979	1979-05-29	1979-09-17
1980	1980-04-21	1980-09-08
1981	1981-07-07	1981-09-11
1983	1983-06-11	1983-09-03
1984	1984-05-17	1984-08-29
1985	1985-07-07	1985-08-09
1986	1986-05-29	1986-08-20
1987	1987-05-09	1987-08-11
1988	1988-05-29	1988-08-16
1989	1989-07-02	1989-10-01
1990	1990-06-11	1990-09-04
1991	1991-07-16	1991-09-02
1992	1992-05-07	1992-10-02
1993	1993-05-14	1993-08-11
1994	1994-05-19	1994-09-10
1995	1995-06-16	1995-08-18
1996	1996-06-10	1996-08-25
1997	1997-06-02	1997-08-25
1998	1998-09-05	1998-09-11
1999	1999-07-29	1999-07-30
2000	2000-08-12	2000-08-12
2001	2001-05-15	2001-09-06
2002	2002-06-30	2002-07-27
2003	2003-08-14	2003-09-08
2005	2005-07-31	2005-08-03
2006	2006-05-24	2006-08-21
2007	2007-06-24	2007-09-02

Every Fixed Threshold

Fixed thresholds at Rolla 1NE
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	68	36	1939	13
35 C (95 F): Days	29	12	1988	2
90 F (32.2 C): Days	58	22	1988	8
100 F (37.8 C): Days	4	2	1988	2
0 C (32 F): Ice days (max	70	140	1996	115
0 C (32 F): Frost days (min	69	221	1945	184
-10 C (14 F): Days with min	69	134	1955	110
-20 C (-4 F): Days with min	69	82	1955	43
-30 C (-22 F): Days with min	68	22	1996	9
-40 C (-40 F): Days with min	2	3	1996	3
20 C (68 F): Tropical nights (min	31	5	1947	1
25 C (77 F): Days with min	2	1	1940	1
10 mm (0.39 in): Days with 10 mm or more rain	71	21	1905	13
25 mm (0.98 in): Days with 25 mm or more rain	68	9	2005	2
50 mm (1.97 in): Days with 50 mm or more rain	29	2	1941	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1905	1
10 cm (3.9 in): Days with 10 cm or more snowfall	32	5	1970	3
25 cm (9.8 in): Days with 25 cm or more snowfall	5	1	1953	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1905.

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Data for Rolla 1NE 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).

Rolla 1NE Threshold Days by Year

Key Facts for Rolla 1NE Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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