Portal Threshold Days by Year

18 fixed thresholds counted per year at Portal (USC00327201): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Portal Thresholds

Portal: days with a maximum temperature at or above 30 C (86 F) in 47 years, most in 1894 with 69.
Portal: days with a maximum temperature at or above 90 F (32.2 C) in 47 years, most in 1894 with 58.
Portal: days with a maximum temperature at or below 0 C (32 F) in 47 years, most in 1951 with 128.
Portal: nights with a minimum temperature at or below 0 C (32 F) in 47 years, most in 1966 with 218.
18 fixed thresholds have at least one qualifying day at Portal.

Days at or above 30 C (86 F)

47 years with a qualifying day

Days per year at Portal with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 69 in 1894.

Days at or above 30 C (86 F) per year at Portal
Year	Days	Decade average
1894	69	37.6
1895	29	37.6
1896	34	37.6
1897	34	37.6
1898	22	37.6
1900	29	18.3
1903	6	18.3
1906	20	18.3
1930	34	39.4
1931	50	39.4
1932	33	39.4
1933	41	39.4
1934	44	39.4
1935	19	39.4
1936	52	39.4
1937	46	39.4
1938	35	39.4
1939	40	39.4
1940	36	23
1941	18	23
1942	19	23
1943	15	23
1944	10	23
1948	29	23
1949	34	23
1950	11	19.1
1951	17	19.1
1952	20	19.1
1953	16	19.1
1954	11	19.1
1955	22	19.1
1956	15	19.1
1957	27	19.1
1958	25	19.1
1959	27	19.1
1960	28	27.2
1961	53	27.2
1962	13	27.2
1963	27	27.2
1964	22	27.2
1965	20	27.2
1966	33	27.2
1967	35	27.2
1968	15	27.2
1969	26	27.2
1970	36	28
1971	20	28

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

First to last qualifying date each year at Portal
Year	First date	Last date
1894	1894-04-28	1894-09-13
1895	1895-05-31	1895-09-03
1896	1896-06-02	1896-09-23
1897	1897-05-04	1897-10-02
1898	1898-06-19	1898-09-27
1900	1900-05-12	1900-08-26
1903	1903-05-15	1903-08-20
1906	1906-05-11	1906-09-09
1930	1930-05-02	1930-09-18
1931	1931-05-12	1931-09-28
1932	1932-05-13	1932-09-07
1933	1933-05-30	1933-09-17
1934	1934-05-05	1934-10-12
1935	1935-06-09	1935-09-22
1936	1936-05-16	1936-09-22
1937	1937-05-27	1937-09-20
1938	1938-06-18	1938-09-26
1939	1939-04-30	1939-09-22
1940	1940-06-01	1940-09-17
1941	1941-06-25	1941-09-02
1942	1942-07-12	1942-10-10
1943	1943-07-05	1943-10-05
1944	1944-05-13	1944-08-07
1948	1948-05-18	1948-09-16
1949	1949-04-29	1949-09-25
1950	1950-06-15	1950-09-05
1951	1951-05-24	1951-08-24
1952	1952-04-20	1952-09-28
1953	1953-05-07	1953-10-02
1954	1954-06-24	1954-09-01
1955	1955-06-16	1955-10-11
1956	1956-05-22	1956-09-27
1957	1957-07-07	1957-10-04
1958	1958-05-13	1958-09-02
1959	1959-05-25	1959-08-29
1960	1960-05-13	1960-09-21
1961	1961-05-31	1961-09-01
1962	1962-04-25	1962-09-07
1963	1963-05-31	1963-10-01
1964	1964-05-21	1964-09-18
1965	1965-07-16	1965-08-24
1966	1966-05-22	1966-09-21
1967	1967-06-28	1967-09-12
1968	1968-05-01	1968-09-15
1969	1969-05-27	1969-09-14
1970	1970-06-04	1970-09-06
1971	1971-07-21	1971-09-12

Every Fixed Threshold

Fixed thresholds at Portal
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	47	69	1894	20
35 C (95 F): Days	42	35	1894	7
40 C (104 F): Days	9	5	1931	1
90 F (32.2 C): Days	47	58	1894	12
100 F (37.8 C): Days	23	15	1894	1
0 C (32 F): Ice days (max	47	128	1951	108
0 C (32 F): Frost days (min	47	218	1966	176
-10 C (14 F): Days with min	47	137	1935	108
-20 C (-4 F): Days with min	47	83	1936	47
-30 C (-22 F): Days with min	47	36	1936	10
-40 C (-40 F): Days with min	9	6	1936	2
20 C (68 F): Tropical nights (min	16	3	1896	1
10 mm (0.39 in): Days with 10 mm or more rain	42	21	1903	12
25 mm (0.98 in): Days with 25 mm or more rain	36	6	1903	3
50 mm (1.97 in): Days with 50 mm or more rain	12	2	1903	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1906	1
10 cm (3.9 in): Days with 10 cm or more snowfall	19	5	1967	3
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1950	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 Portal 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Portal Threshold Days by Year

Key Facts for Portal Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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