Naco Threshold Days by Year (CA003014760)

16 fixed thresholds counted per year at Naco (CA003014760): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Naco Thresholds

Naco: days with a maximum temperature at or above 30 C (86 F) in 32 years, most in 1961 with 34.
Naco: days with a maximum temperature at or above 90 F (32.2 C) in 32 years, most in 1933 with 20.
Naco: days with a maximum temperature at or below 0 C (32 F) in 32 years, most in 1951 with 137.
Naco: days with 10 mm (0.39 in) or more of precipitation in 32 years, most in 1946 with 17.
16 fixed thresholds have at least one qualifying day at Naco.

Days at or above 30 C (86 F)

32 years with a qualifying day

Days per year at Naco with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 34 in 1961.

Days at or above 30 C (86 F) per year at Naco
Year	Days	Decade average
1931	25	20.8
1932	17	20.8
1933	25	20.8
1934	18	20.8
1935	12	20.8
1936	26	20.8
1937	26	20.8
1938	16	20.8
1939	22	20.8
1940	18	16.6
1941	23	16.6
1942	8	16.6
1943	16	16.6
1944	15	16.6
1945	19	16.6
1946	11	16.6
1947	28	16.6
1948	14	16.6
1949	14	16.6
1950	10	7.8
1951	3	7.8
1952	7	7.8
1953	8	7.8
1954	4	7.8
1955	9	7.8
1956	5	7.8
1957	7	7.8
1958	16	7.8
1959	9	7.8
1960	12	16.3
1961	34	16.3
1962	3	16.3

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

First to last qualifying date each year at Naco
Year	First date	Last date
1931	1931-06-07	1931-08-28
1932	1932-06-13	1932-09-08
1933	1933-06-13	1933-08-29
1934	1934-05-15	1934-09-06
1935	1935-06-22	1935-08-22
1936	1936-05-26	1936-08-09
1937	1937-06-02	1937-09-18
1938	1938-06-19	1938-09-21
1939	1939-04-29	1939-08-24
1940	1940-05-10	1940-09-11
1941	1941-05-23	1941-08-23
1942	1942-06-14	1942-09-05
1943	1943-07-02	1943-09-25
1944	1944-05-26	1944-08-06
1945	1945-06-19	1945-09-03
1946	1946-07-11	1946-08-23
1947	1947-07-02	1947-08-08
1948	1948-06-01	1948-09-14
1949	1949-06-09	1949-09-09
1950	1950-06-12	1950-09-03
1951	1951-07-23	1951-08-04
1952	1952-07-30	1952-09-26
1953	1953-05-07	1953-08-20
1954	1954-07-05	1954-07-20
1955	1955-07-14	1955-09-02
1956	1956-06-01	1956-07-20
1957	1957-07-11	1957-10-01
1958	1958-05-27	1958-09-12
1959	1959-07-11	1959-08-01
1960	1960-07-14	1960-09-03
1961	1961-06-03	1961-09-05
1962	1962-06-24	1962-09-27

Every Fixed Threshold

Fixed thresholds at Naco
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	32	34	1961	3
35 C (95 F): Days	22	7	1933	3
40 C (104 F): Days	1	1	1941	1
90 F (32.2 C): Days	32	20	1933	1
100 F (37.8 C): Days	6	4	1933	1
0 C (32 F): Ice days (max	32	137	1951	93
0 C (32 F): Frost days (min	30	234	1945	215
-10 C (14 F): Days with min	30	143	1935	107
-20 C (-4 F): Days with min	30	88	1936	52
-30 C (-22 F): Days with min	30	41	1936	19
-40 C (-40 F): Days with min	13	11	1950	3
20 C (68 F): Tropical nights (min	2	1	1937	1
10 mm (0.39 in): Days with 10 mm or more rain	32	17	1946	7
25 mm (0.98 in): Days with 25 mm or more rain	19	4	1944	2
50 mm (1.97 in): Days with 50 mm or more rain	3	2	1950	2
10 cm (3.9 in): Days with 10 cm or more snowfall	23	6	1948	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1931.

Download the Data

Data for Naco 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).

Naco Threshold Days by Year (CA003014760)

Key Facts for Naco Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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