Rosette Threshold Days by Year (USC00427408)

15 fixed thresholds counted per year at Rosette (USC00427408): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rosette Thresholds

Rosette: days with a maximum temperature at or above 30 C (86 F) in 33 years, most in 2001 with 66.
Rosette: days with a maximum temperature at or below 0 C (32 F) in 33 years, most in 2004 with 47.
Rosette: days with 10 mm (0.39 in) or more of precipitation in 33 years, most in 1998 with 13.
Rosette: days with a maximum temperature at or above 90 F (32.2 C) in 32 years, most in 2021 with 45.
15 fixed thresholds have at least one qualifying day at Rosette.

Days at or above 30 C (86 F)

33 years with a qualifying day

Days per year at Rosette with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 66 in 2001.

Days at or above 30 C (86 F) per year at Rosette
Year	Days	Decade average
1992	36	32.8
1993	5	32.8
1994	53	32.8
1995	33	32.8
1996	42	32.8
1997	21	32.8
1998	40	32.8
1999	32	32.8
2000	56	48.8
2001	66	48.8
2002	45	48.8
2003	59	48.8
2004	28	48.8
2005	29	48.8
2007	63	48.8
2008	58	48.8
2009	35	48.8
2010	34	42.1
2012	52	42.1
2013	49	42.1
2014	22	42.1
2015	37	42.1
2016	47	42.1
2017	51	42.1
2018	53	42.1
2019	34	42.1
2020	59	55.7
2021	66	55.7
2022	62	55.7
2023	32	55.7
2024	57	55.7
2025	60	55.7
2026	54	55.7

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

First to last qualifying date each year at Rosette
Year	First date	Last date
1992	1992-06-22	1992-08-29
1993	1993-06-27	1993-09-10
1994	1994-06-12	1994-09-09
1995	1995-06-14	1995-09-17
1996	1996-06-09	1996-09-11
1997	1997-07-06	1997-09-09
1998	1998-07-04	1998-09-05
1999	1999-07-04	1999-08-30
2000	2000-06-23	2000-09-17
2001	2001-05-25	2001-10-03
2002	2002-05-31	2002-09-04
2003	2003-05-24	2003-09-29
2004	2004-06-05	2004-09-12
2005	2005-07-07	2005-08-31
2007	2007-06-17	2007-09-04
2008	2008-05-19	2008-08-31
2009	2009-05-19	2009-09-13
2010	2010-06-29	2010-09-05
2012	2012-06-02	2012-09-15
2013	2013-05-13	2013-09-02
2014	2014-06-25	2014-09-18
2015	2015-06-18	2015-09-13
2016	2016-06-06	2016-09-02
2017	2017-06-08	2017-09-13
2018	2018-06-05	2018-09-11
2019	2019-07-12	2019-09-06
2020	2020-05-30	2020-09-18
2021	2021-06-03	2021-09-11
2022	2022-06-11	2022-09-09
2023	2023-07-02	2023-08-30
2024	2024-06-07	2024-09-30
2025	2025-06-01	2025-09-05
2026	2026-05-12	2026-08-28

Every Fixed Threshold

Fixed thresholds at Rosette
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	33	66	2001	54
35 C (95 F): Days	23	16	2001	13
90 F (32.2 C): Days	32	45	2021	37
100 F (37.8 C): Days	4	5	2001	2
0 C (32 F): Ice days (max	33	47	2004	6
0 C (32 F): Frost days (min	30	192	2009	72
-10 C (14 F): Days with min	30	66	2013	2
-20 C (-4 F): Days with min	14	11	2013	2
20 C (68 F): Tropical nights (min	26	30	2022	30
25 C (77 F): Days with min	2	1	2013	1
10 mm (0.39 in): Days with 10 mm or more rain	33	13	1998	3
25 mm (0.98 in): Days with 25 mm or more rain	12	3	1998	1
50 mm (1.97 in): Days with 50 mm or more rain	1	1	2023	1
10 cm (3.9 in): Days with 10 cm or more snowfall	12	5	2016	3
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	2019	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1992.

Download the Data

Data for Rosette 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Rosette Threshold Days by Year (USC00427408)

Key Facts for Rosette Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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