Underwood 12 W Threshold Days by Year

20 fixed thresholds counted per year at Underwood 12 W (USC00328877): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Underwood 12 W Thresholds

Underwood 12 W: days with a maximum temperature at or above 30 C (86 F) in 28 years, most in 1936 with 82.
Underwood 12 W: days with a maximum temperature at or above 90 F (32.2 C) in 28 years, most in 1936 with 60.
Underwood 12 W: days with a maximum temperature at or below 0 C (32 F) in 28 years, most in 1950 with 116.
Underwood 12 W: nights with a minimum temperature at or below 0 C (32 F) in 28 years, most in 1945 with 211.
20 fixed thresholds have at least one qualifying day at Underwood 12 W.

Days at or above 30 C (86 F)

28 years with a qualifying day

Days per year at Underwood 12 W with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 82 in 1936.

Days at or above 30 C (86 F) per year at Underwood 12 W
Year	Days	Decade average
1923	43	31.7
1924	19	31.7
1925	31	31.7
1926	38	31.7
1927	22	31.7
1928	26	31.7
1929	43	31.7
1930	43	52.8
1931	56	52.8
1932	37	52.8
1933	60	52.8
1934	59	52.8
1935	37	52.8
1936	82	52.8
1937	57	52.8
1938	41	52.8
1939	56	52.8
1940	53	33
1941	43	33
1942	20	33
1943	27	33
1944	18	33
1945	25	33
1946	29	33
1947	28	33
1949	54	33
1950	25	27
1953	29	27

For each year, a bar from the first to the last day at Underwood 12 W meeting 30 C (86 F).

First to last qualifying date each year at Underwood 12 W
Year	First date	Last date
1923	1923-04-28	1923-09-21
1924	1924-07-05	1924-09-30
1925	1925-05-19	1925-09-16
1926	1926-04-29	1926-09-02
1927	1927-06-26	1927-09-13
1928	1928-05-06	1928-09-06
1929	1929-06-14	1929-09-14
1930	1930-05-03	1930-09-18
1931	1931-05-14	1931-09-09
1932	1932-05-13	1932-09-08
1933	1933-05-31	1933-09-19
1934	1934-04-28	1934-10-13
1935	1935-06-29	1935-09-22
1936	1936-05-11	1936-10-08
1937	1937-05-27	1937-10-03
1938	1938-05-28	1938-10-03
1939	1939-04-30	1939-09-21
1940	1940-05-11	1940-09-18
1941	1941-05-13	1941-09-19
1942	1942-04-22	1942-09-10
1943	1943-05-22	1943-09-29
1944	1944-05-13	1944-08-18
1945	1945-06-21	1945-09-05
1946	1946-06-04	1946-09-16
1947	1947-07-03	1947-09-07
1949	1949-04-29	1949-09-25
1950	1950-06-13	1950-09-07
1953	1953-06-12	1953-10-02

Every Fixed Threshold

Fixed thresholds at Underwood 12 W
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	28	82	1936	29
35 C (95 F): Days	26	33	1936	1
40 C (104 F): Days	8	13	1936	1
45 C (113 F): Days	1	2	1936	2
90 F (32.2 C): Days	28	60	1936	12
100 F (37.8 C): Days	18	22	1936	3
110 F (43.3 C): Days	1	4	1936	4
0 C (32 F): Ice days (max	28	116	1950	74
0 C (32 F): Frost days (min	28	211	1945	193
-10 C (14 F): Days with min	28	124	1950	90
-20 C (-4 F): Days with min	28	62	1950	18
-30 C (-22 F): Days with min	27	28	1936	1
-40 C (-40 F): Days with min	8	3	1936	3
20 C (68 F): Tropical nights (min	23	9	1936	1
25 C (77 F): Days with min	2	2	1933	2
10 mm (0.39 in): Days with 10 mm or more rain	25	21	1941	17
25 mm (0.98 in): Days with 25 mm or more rain	22	6	1914	1
50 mm (1.97 in): Days with 50 mm or more rain	5	3	1914	1
10 cm (3.9 in): Days with 10 cm or more snowfall	3	5	1950	4
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1950	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1923.

Download the Data

Data for Underwood 12 W 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Underwood 12 W Threshold Days by Year

Key Facts for Underwood 12 W Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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