Harrison 1 NNW Threshold Days by Year (USC00203616)

16 fixed thresholds counted per year at Harrison 1 NNW (USC00203616): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Harrison 1 NNW Thresholds

Harrison 1 NNW: days with 10 mm (0.39 in) or more of precipitation in 50 years, most in 1945 with 37.
Harrison 1 NNW: days with 25 mm (0.98 in) or more of precipitation in 50 years, most in 1906 with 11.
Harrison 1 NNW: days with 10 cm (3.9 in) or more of snowfall in 34 years, most in 1971 with 8.
Harrison 1 NNW: days with 50 mm (1.97 in) or more of precipitation in 27 years, most in 1947 with 3.
16 fixed thresholds have at least one qualifying day at Harrison 1 NNW.

Days at or above 30 C (86 F)

13 years with a qualifying day

Days per year at Harrison 1 NNW with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 44 in 1910.

Days at or above 30 C (86 F) per year at Harrison 1 NNW
Year	Days	Decade average
1894	39	32.5
1896	26	32.5
1905	13	24.8
1906	29	24.8
1907	14	24.8
1908	33	24.8
1909	35	24.8
1910	44	28.8
1911	36	28.8
1913	27	28.8
1915	8	28.8
1923	34	20.5
1924	7	20.5

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

First to last qualifying date each year at Harrison 1 NNW
Year	First date	Last date
1894	1894-06-08	1894-09-03
1896	1896-05-08	1896-08-11
1905	1905-06-14	1905-09-29
1906	1906-05-22	1906-09-18
1907	1907-06-17	1907-09-01
1908	1908-06-06	1908-09-26
1909	1909-06-21	1909-09-14
1910	1910-06-13	1910-09-07
1911	1911-05-17	1911-09-01
1913	1913-06-13	1913-09-08
1915	1915-04-24	1915-08-02
1923	1923-06-01	1923-08-14
1924	1924-06-20	1924-08-30

Every Fixed Threshold

Fixed thresholds at Harrison 1 NNW
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	13	44	1910	7
35 C (95 F): Days	8	11	1910	7
90 F (32.2 C): Days	11	26	1910	24
100 F (37.8 C): Days	2	3	1911	3
0 C (32 F): Ice days (max	13	80	1896	77
0 C (32 F): Frost days (min	12	195	1907	160
-10 C (14 F): Days with min	12	74	1924	74
-20 C (-4 F): Days with min	11	20	1924	20
-30 C (-22 F): Days with min	2	1	1894	1
20 C (68 F): Tropical nights (min	11	10	1910	5
10 mm (0.39 in): Days with 10 mm or more rain	50	37	1945	25
25 mm (0.98 in): Days with 25 mm or more rain	50	11	1906	7
50 mm (1.97 in): Days with 50 mm or more rain	27	3	1947	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1957	1
10 cm (3.9 in): Days with 10 cm or more snowfall	34	8	1971	7
25 cm (9.8 in): Days with 25 cm or more snowfall	5	1	1949	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1894.

Download the Data

Data for Harrison 1 NNW 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).

Harrison 1 NNW Threshold Days by Year (USC00203616)

Key Facts for Harrison 1 NNW Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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