Williamsport Threshold Days by Year (USC00369733)

17 fixed thresholds counted per year at Williamsport (USC00369733): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Williamsport Thresholds

Williamsport: days with a maximum temperature at or above 30 C (86 F) in 49 years, most in 1911 with 68.
Williamsport: days with a maximum temperature at or below 0 C (32 F) in 49 years, most in 1904 with 61.
Williamsport: nights with a minimum temperature at or below 0 C (32 F) in 49 years, most in 1917 with 150.
Williamsport: nights with a minimum temperature at or below -10 C (14 F) in 49 years, most in 1904 with 47.
17 fixed thresholds have at least one qualifying day at Williamsport.

Days at or above 30 C (86 F)

49 years with a qualifying day

Days per year at Williamsport with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 68 in 1911.

Days at or above 30 C (86 F) per year at Williamsport
Year	Days	Decade average
1896	30	30
1897	18	30
1898	39	30
1899	33	30
1900	59	26
1901	37	26
1902	17	26
1903	17	26
1904	15	26
1905	16	26
1906	23	26
1907	16	26
1908	33	26
1909	27	26
1910	27	34.6
1911	68	34.6
1912	27	34.6
1913	38	34.6
1914	41	34.6
1915	16	34.6
1916	29	34.6
1917	15	34.6
1918	42	34.6
1919	43	34.6
1920	35	43.2
1921	62	43.2
1922	44	43.2
1923	42	43.2
1924	32	43.2
1925	54	43.2
1926	39	43.2
1927	25	43.2
1928	40	43.2
1929	59	43.2
1930	57	50.2
1931	58	50.2
1932	61	50.2
1933	44	50.2
1934	54	50.2
1935	30	50.2
1936	53	50.2
1937	45	50.2
1938	55	50.2
1939	45	50.2
1940	26	54.6
1941	65	54.6
1942	53	54.6
1943	67	54.6
1944	62	54.6

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

First to last qualifying date each year at Williamsport
Year	First date	Last date
1896	1896-04-16	1896-09-12
1897	1897-06-30	1897-10-16
1898	1898-06-06	1898-09-06
1899	1899-05-01	1899-09-03
1900	1900-05-14	1900-09-27
1901	1901-06-06	1901-09-07
1902	1902-04-22	1902-09-01
1903	1903-04-30	1903-08-27
1904	1904-05-25	1904-09-03
1905	1905-05-04	1905-08-11
1906	1906-05-18	1906-09-19
1907	1907-05-14	1907-09-23
1908	1908-05-27	1908-08-14
1909	1909-05-15	1909-08-26
1910	1910-06-18	1910-09-06
1911	1911-05-11	1911-09-11
1912	1912-05-24	1912-09-11
1913	1913-04-25	1913-09-07
1914	1914-05-21	1914-10-06
1915	1915-04-25	1915-09-17
1916	1916-07-02	1916-08-23
1917	1917-07-21	1917-08-21
1918	1918-05-06	1918-08-27
1919	1919-05-04	1919-10-03
1920	1920-05-27	1920-09-26
1921	1921-04-25	1921-09-15
1922	1922-04-10	1922-10-06
1923	1923-06-02	1923-08-21
1924	1924-06-19	1924-09-02
1925	1925-04-23	1925-09-13
1926	1926-05-17	1926-09-25
1927	1927-06-09	1927-10-02
1928	1928-05-04	1928-09-16
1929	1929-04-06	1929-09-28
1930	1930-05-05	1930-09-26
1931	1931-05-28	1931-10-04
1932	1932-06-01	1932-09-22
1933	1933-05-20	1933-09-25
1934	1934-05-05	1934-09-04
1935	1935-06-14	1935-08-26
1936	1936-05-07	1936-09-23
1937	1937-05-22	1937-09-03
1938	1938-04-28	1938-10-17
1939	1939-04-25	1939-10-10
1940	1940-06-03	1940-09-21
1941	1941-04-15	1941-10-07
1942	1942-04-25	1942-09-19
1943	1943-05-06	1943-09-08
1944	1944-05-04	1944-09-21

Every Fixed Threshold

Fixed thresholds at Williamsport
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	49	68	1911	62
35 C (95 F): Days	35	17	1923	10
40 C (104 F): Days	2	2	1936	2
90 F (32.2 C): Days	48	37	1941	34
100 F (37.8 C): Days	12	4	1936	1
0 C (32 F): Ice days (max	49	61	1904	20
0 C (32 F): Frost days (min	49	150	1917	116
-10 C (14 F): Days with min	49	47	1904	22
-20 C (-4 F): Days with min	28	8	1914	2
20 C (68 F): Tropical nights (min	49	42	1901	8
25 C (77 F): Days with min	8	7	1901	2
10 mm (0.39 in): Days with 10 mm or more rain	43	41	1940	33
25 mm (0.98 in): Days with 25 mm or more rain	43	15	1908	11
50 mm (1.97 in): Days with 50 mm or more rain	32	4	1909	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1933	1
10 cm (3.9 in): Days with 10 cm or more snowfall	20	6	1941	6
25 cm (9.8 in): Days with 25 cm or more snowfall	4	2	1926	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1896.

Download the Data

Data for Williamsport 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).

Williamsport Threshold Days by Year (USC00369733)

Key Facts for Williamsport Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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