Napoleon Threshold Days by Year (USC00335669)

18 fixed thresholds counted per year at Napoleon (USC00335669): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Napoleon Thresholds

Napoleon: days with 10 mm (0.39 in) or more of precipitation in 42 years, most in 1973 with 41.
Napoleon: days with 25 mm (0.98 in) or more of precipitation in 42 years, most in 2007 with 13.
Napoleon: days with a maximum temperature at or above 30 C (86 F) in 39 years, most in 1991 with 69.
Napoleon: days with a maximum temperature at or above 90 F (32.2 C) in 39 years, most in 1988 with 50.
18 fixed thresholds have at least one qualifying day at Napoleon.

Days at or above 30 C (86 F)

39 years with a qualifying day

Days per year at Napoleon with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 69 in 1991.

Days at or above 30 C (86 F) per year at Napoleon
Year	Days	Decade average
1963	43	42.6
1964	57	42.6
1965	27	42.6
1966	50	42.6
1967	29	42.6
1968	45	42.6
1969	47	42.6
1970	57	44.2
1971	53	44.2
1972	32	44.2
1973	47	44.2
1974	39	44.2
1975	47	44.2
1976	34	44.2
1977	50	44.2
1978	54	44.2
1979	29	44.2
1980	50	43.1
1981	25	43.1
1982	36	43.1
1983	58	43.1
1984	40	43.1
1985	29	43.1
1986	34	43.1
1987	59	43.1
1988	67	43.1
1989	33	43.1
1990	35	35
1991	69	35
1992	25	35
1993	23	35
1994	25	35
1995	33	35
2003	20	36.7
2004	24	36.7
2005	59	36.7
2006	30	36.7
2007	53	36.7
2008	34	36.7

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

First to last qualifying date each year at Napoleon
Year	First date	Last date
1963	1963-05-09	1963-10-07
1964	1964-05-19	1964-09-21
1965	1965-05-25	1965-09-19
1966	1966-05-27	1966-09-03
1967	1967-05-27	1967-08-18
1968	1968-06-06	1968-09-23
1969	1969-05-06	1969-09-07
1970	1970-05-21	1970-09-22
1971	1971-05-18	1971-10-03
1972	1972-05-24	1972-09-17
1973	1973-06-03	1973-09-27
1974	1974-06-09	1974-08-27
1975	1975-05-19	1975-08-26
1976	1976-06-07	1976-09-08
1977	1977-05-16	1977-09-02
1978	1978-05-27	1978-09-21
1979	1979-05-08	1979-09-01
1980	1980-05-29	1980-09-23
1981	1981-06-08	1981-08-14
1982	1982-05-06	1982-09-13
1983	1983-06-12	1983-09-20
1984	1984-05-19	1984-09-23
1985	1985-04-20	1985-09-09
1986	1986-04-28	1986-09-30
1987	1987-04-22	1987-09-28
1988	1988-05-16	1988-09-19
1989	1989-06-01	1989-09-10
1990	1990-04-25	1990-09-07
1991	1991-05-12	1991-10-01
1992	1992-05-18	1992-09-16
1993	1993-05-11	1993-08-31
1994	1994-05-23	1994-09-17
1995	1995-06-19	1995-09-07
2003	2003-06-24	2003-08-29
2004	2004-04-19	2004-09-23
2005	2005-06-06	2005-10-05
2006	2006-05-29	2006-08-27
2007	2007-05-15	2007-10-09
2008	2008-06-06	2008-09-14

Every Fixed Threshold

Fixed thresholds at Napoleon
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	39	69	1991	34
35 C (95 F): Days	26	23	1988	1
40 C (104 F): Days	1	2	1988	2
90 F (32.2 C): Days	39	50	1988	12
100 F (37.8 C): Days	2	8	1988	1
0 C (32 F): Ice days (max	39	62	2005	53
0 C (32 F): Frost days (min	35	149	1987	142
-10 C (14 F): Days with min	35	57	1978	35
-20 C (-4 F): Days with min	28	13	1963	4
-30 C (-22 F): Days with min	1	1	1984	1
20 C (68 F): Tropical nights (min	35	33	2005	18
25 C (77 F): Days with min	2	1	1977	1
10 mm (0.39 in): Days with 10 mm or more rain	42	41	1973	37
25 mm (0.98 in): Days with 25 mm or more rain	42	13	2007	9
50 mm (1.97 in): Days with 50 mm or more rain	28	4	2007	2
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1975	1
10 cm (3.9 in): Days with 10 cm or more snowfall	24	3	1977	1
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1978	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1963.

Download the Data

Data for Napoleon 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).

Napoleon Threshold Days by Year (USC00335669)

Key Facts for Napoleon Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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