Montrose 1 Threshold Days by Year (USC00055717)

14 fixed thresholds counted per year at Montrose 1 (USC00055717): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Montrose 1 Thresholds

Montrose 1: days with 10 mm (0.39 in) or more of precipitation in 70 years, most in 1941 with 11.
Montrose 1: days with a maximum temperature at or above 30 C (86 F) in 33 years, most in 1934 with 93.
Montrose 1: days with a maximum temperature at or above 90 F (32.2 C) in 33 years, most in 1935 with 60.
Montrose 1: days with a maximum temperature at or below 0 C (32 F) in 33 years, most in 1930 with 46.
14 fixed thresholds have at least one qualifying day at Montrose 1.

Days at or above 30 C (86 F)

33 years with a qualifying day

Days per year at Montrose 1 with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 93 in 1934.

Days at or above 30 C (86 F) per year at Montrose 1
Year	Days	Decade average
1905	11	28
1908	41	28
1909	32	28
1911	42	56.2
1912	47	56.2
1913	49	56.2
1914	50	56.2
1915	67	56.2
1916	51	56.2
1917	70	56.2
1918	57	56.2
1919	73	56.2
1920	59	54.6
1921	52	54.6
1922	73	54.6
1923	58	54.6
1924	61	54.6
1925	53	54.6
1926	55	54.6
1927	38	54.6
1928	50	54.6
1929	47	54.6
1930	59	70.7
1931	84	70.7
1932	60	70.7
1933	81	70.7
1934	93	70.7
1935	83	70.7
1936	75	70.7
1937	48	70.7
1938	49	70.7
1939	75	70.7
1940	76	76

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

First to last qualifying date each year at Montrose 1
Year	First date	Last date
1905	1905-07-11	1905-08-28
1908	1908-06-21	1908-09-17
1909	1909-06-18	1909-08-26
1911	1911-06-06	1911-09-12
1912	1912-05-29	1912-08-27
1913	1913-05-12	1913-08-31
1914	1914-06-11	1914-09-19
1915	1915-05-13	1915-09-23
1916	1916-05-09	1916-09-07
1917	1917-06-09	1917-09-10
1918	1918-06-04	1918-09-13
1919	1919-05-26	1919-09-11
1920	1920-05-20	1920-09-19
1921	1921-05-28	1921-09-14
1922	1922-05-27	1922-09-25
1923	1923-06-11	1923-09-11
1924	1924-06-11	1924-10-02
1925	1925-05-18	1925-08-22
1926	1926-05-22	1926-09-19
1927	1927-05-16	1927-08-24
1928	1928-05-30	1928-09-07
1929	1929-06-08	1929-08-31
1930	1930-05-26	1930-09-20
1931	1931-05-24	1931-09-11
1932	1932-05-21	1932-09-08
1933	1933-05-26	1933-09-29
1934	1934-05-07	1934-09-16
1935	1935-06-05	1935-09-19
1936	1936-05-04	1936-08-28
1937	1937-05-17	1937-09-18
1938	1938-05-27	1938-08-28
1939	1939-05-29	1939-09-03
1940	1940-05-30	1940-09-09

Every Fixed Threshold

Fixed thresholds at Montrose 1
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	33	93	1934	76
35 C (95 F): Days	28	28	1933	26
90 F (32.2 C): Days	33	60	1935	59
100 F (37.8 C): Days	8	6	1931	3
0 C (32 F): Ice days (max	33	46	1930	19
0 C (32 F): Frost days (min	32	200	1909	139
-10 C (14 F): Days with min	32	73	1919	32
-20 C (-4 F): Days with min	26	15	1919	4
-30 C (-22 F): Days with min	2	1	1913	1
20 C (68 F): Tropical nights (min	3	2	1931	2
10 mm (0.39 in): Days with 10 mm or more rain	70	11	1941	4
25 mm (0.98 in): Days with 25 mm or more rain	19	2	1938	1
10 cm (3.9 in): Days with 10 cm or more snowfall	20	6	1949	2
25 cm (9.8 in): Days with 25 cm or more snowfall	2	2	1930	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.

Download the Data

Data for Montrose 1 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).

Montrose 1 Threshold Days by Year (USC00055717)

Key Facts for Montrose 1 Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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