Yale 1 NNW Threshold Days by Year (USC00209188)

16 fixed thresholds counted per year at Yale 1 NNW (USC00209188): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Yale 1 NNW Thresholds

Yale 1 NNW: days with 10 mm (0.39 in) or more of precipitation in 80 years, most in 1950 with 42.
Yale 1 NNW: days with 25 mm (0.98 in) or more of precipitation in 79 years, most in 1996 with 11.
Yale 1 NNW: days with 10 cm (3.9 in) or more of snowfall in 62 years, most in 1965 with 6.
Yale 1 NNW: days with 50 mm (1.97 in) or more of precipitation in 36 years, most in 1959 with 3.
16 fixed thresholds have at least one qualifying day at Yale 1 NNW.

Days at or above 30 C (86 F)

13 years with a qualifying day

Days per year at Yale 1 NNW with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 37 in 2010.

Days at or above 30 C (86 F) per year at Yale 1 NNW
Year	Days	Decade average
2007	32	15.7
2008	9	15.7
2009	6	15.7
2010	37	22.8
2011	27	22.8
2012	30	22.8
2013	18	22.8
2014	8	22.8
2015	16	22.8
2016	30	22.8
2017	17	22.8
2018	22	22.8
2020	21	21

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

First to last qualifying date each year at Yale 1 NNW
Year	First date	Last date
2007	2007-05-23	2007-10-09
2008	2008-06-07	2008-09-03
2009	2009-06-24	2009-08-17
2010	2010-05-27	2010-09-22
2011	2011-05-31	2011-09-04
2012	2012-05-29	2012-09-04
2013	2013-05-21	2013-09-12
2014	2014-06-03	2014-09-06
2015	2015-05-09	2015-09-08
2016	2016-05-26	2016-09-08
2017	2017-05-18	2017-09-27
2018	2018-05-26	2018-09-06
2020	2020-05-27	2020-08-28

Every Fixed Threshold

Fixed thresholds at Yale 1 NNW
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	13	37	2010	21
35 C (95 F): Days	5	7	2012	1
90 F (32.2 C): Days	13	18	2012	6
100 F (37.8 C): Days	1	1	2012	1
0 C (32 F): Ice days (max	13	78	2014	34
0 C (32 F): Frost days (min	11	171	2018	159
-10 C (14 F): Days with min	11	65	2014	6
-20 C (-4 F): Days with min	9	24	2014	7
-30 C (-22 F): Days with min	1	3	2015	3
20 C (68 F): Tropical nights (min	10	12	2011	2
10 mm (0.39 in): Days with 10 mm or more rain	80	42	1950	20
25 mm (0.98 in): Days with 25 mm or more rain	79	11	1996	5
50 mm (1.97 in): Days with 50 mm or more rain	36	3	1959	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1986	1
10 cm (3.9 in): Days with 10 cm or more snowfall	62	6	1965	2
25 cm (9.8 in): Days with 25 cm or more snowfall	12	2	2005	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2007.

Download the Data

Data for Yale 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).

Yale 1 NNW Threshold Days by Year (USC00209188)

Key Facts for Yale 1 NNW Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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