Roundup Threshold Days by Year (USC00247214)

17 fixed thresholds counted per year at Roundup (USC00247214): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Roundup Thresholds

Roundup: days with 10 mm (0.39 in) or more of precipitation in 86 years, most in 2010 with 17.
Roundup: nights with a minimum temperature at or below 0 C (32 F) in 84 years, most in 1916 with 199.
Roundup: nights with a minimum temperature at or below -10 C (14 F) in 84 years, most in 1955 with 84.
Roundup: nights with a minimum temperature at or below -20 C (-4 F) in 83 years, most in 1916 with 50.
17 fixed thresholds have at least one qualifying day at Roundup.

Days at or above 30 C (86 F)

69 years with a qualifying day

Days per year at Roundup with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 92 in 2012.

Days at or above 30 C (86 F) per year at Roundup
Year	Days	Decade average
1916	48	64
1919	80	64
1922	61	61
1930	63	60.8
1931	67	60.8
1932	56	60.8
1933	68	60.8
1934	61	60.8
1935	47	60.8
1937	76	60.8
1938	54	60.8
1939	55	60.8
1941	56	58.9
1942	50	58.9
1943	74	58.9
1944	64	58.9
1945	54	58.9
1946	55	58.9
1947	59	58.9
1948	58	58.9
1949	60	58.9
1950	39	52.9
1951	35	52.9
1952	59	52.9
1953	59	52.9
1954	54	52.9
1955	54	52.9
1956	63	52.9
1957	54	52.9
1958	52	52.9
1959	60	52.9
1960	70	61.9
1961	81	61.9
1962	46	61.9
1963	61	61.9
1964	55	61.9
1965	43	61.9
1966	82	61.9
1967	71	61.9
1968	47	61.9
1969	63	61.9
1970	78	63.7
1971	70	63.7
1972	58	63.7
1973	76	63.7
1975	39	63.7
1977	61	63.7
1980	56	62
1981	68	62
1993	10	40.6
1994	54	40.6
1995	38	40.6
1998	56	40.6
1999	45	40.6
2001	71	69.7
2004	50	69.7
2005	69	69.7
2006	87	69.7
2007	76	69.7
2008	70	69.7
2009	65	69.7
2010	56	74.3
2011	82	74.3
2012	92	74.3
2013	74	74.3
2014	61	74.3
2015	81	74.3
2016	67	74.3
2017	81	74.3

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

First to last qualifying date each year at Roundup
Year	First date	Last date
1916	1916-06-09	1916-09-07
1919	1919-05-21	1919-09-12
1922	1922-05-24	1922-09-26
1930	1930-06-07	1930-09-17
1931	1931-05-13	1931-09-07
1932	1932-05-12	1932-09-14
1933	1933-05-30	1933-10-04
1934	1934-05-05	1934-10-11
1935	1935-06-22	1935-09-15
1937	1937-05-18	1937-09-20
1938	1938-05-27	1938-09-30
1939	1939-05-16	1939-09-21
1941	1941-05-12	1941-09-18
1942	1942-07-02	1942-10-11
1943	1943-04-23	1943-10-10
1944	1944-05-05	1944-09-24
1945	1945-06-21	1945-09-13
1946	1946-04-26	1946-09-30
1947	1947-05-02	1947-09-12
1948	1948-04-29	1948-10-03
1949	1949-05-11	1949-09-25
1950	1950-06-05	1950-09-07
1951	1951-05-23	1951-08-22
1952	1952-04-25	1952-09-29
1953	1953-06-11	1953-10-10
1954	1954-05-19	1954-09-26
1955	1955-06-14	1955-09-15
1956	1956-05-17	1956-09-26
1957	1957-06-03	1957-09-28
1958	1958-05-11	1958-09-12
1959	1959-06-03	1959-09-14
1960	1960-05-11	1960-10-06
1961	1961-05-26	1961-09-16
1962	1962-04-19	1962-09-06
1963	1963-06-13	1963-10-04
1964	1964-05-17	1964-09-18
1965	1965-06-12	1965-09-01
1966	1966-05-04	1966-09-23
1967	1967-05-23	1967-09-30
1968	1968-04-30	1968-09-12
1969	1969-05-13	1969-09-19
1970	1970-05-17	1970-10-05
1971	1971-05-27	1971-09-11
1972	1972-05-15	1972-08-29
1973	1973-05-16	1973-09-30
1975	1975-05-15	1975-10-06
1977	1977-04-26	1977-09-15
1980	1980-04-19	1980-10-09
1981	1981-05-01	1981-09-20
1993	1993-05-13	1993-09-11
1994	1994-06-21	1994-09-09
1995	1995-06-13	1995-09-04
1998	1998-05-26	1998-09-17
1999	1999-05-28	1999-09-23
2001	2001-05-12	2001-10-02
2004	2004-05-04	2004-10-09
2005	2005-06-16	2005-10-01
2006	2006-05-16	2006-09-14
2007	2007-05-09	2007-09-16
2008	2008-05-17	2008-09-20
2009	2009-05-19	2009-09-27
2010	2010-05-17	2010-10-03
2011	2011-06-05	2011-10-04
2012	2012-04-23	2012-09-19
2013	2013-05-12	2013-09-22
2014	2014-05-24	2014-09-26
2015	2015-04-29	2015-10-11
2016	2016-04-23	2016-10-02
2017	2017-05-05	2017-09-14

Every Fixed Threshold

Fixed thresholds at Roundup
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	69	92	2012	81
35 C (95 F): Days	68	49	2012	40
40 C (104 F): Days	30	5	1961	5
90 F (32.2 C): Days	69	71	2012	65
100 F (37.8 C): Days	59	23	2012	14
0 C (32 F): Ice days (max	69	62	1916	47
0 C (32 F): Frost days (min	84	199	1916	180
-10 C (14 F): Days with min	84	84	1955	49
-20 C (-4 F): Days with min	83	50	1916	21
-30 C (-22 F): Days with min	60	11	1950	3
-40 C (-40 F): Days with min	4	1	1919	1
20 C (68 F): Tropical nights (min	36	5	2007	2
10 mm (0.39 in): Days with 10 mm or more rain	86	17	2010	6
25 mm (0.98 in): Days with 25 mm or more rain	63	5	2013	2
50 mm (1.97 in): Days with 50 mm or more rain	10	1	1930	1
10 cm (3.9 in): Days with 10 cm or more snowfall	43	13	1919	2
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1919	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1916.

Download the Data

Data for Roundup 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).

Roundup Threshold Days by Year (USC00247214)

Key Facts for Roundup Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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