Hulah Dam Threshold Days by Year

19 fixed thresholds counted per year at Hulah Dam (USC00344393): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Hulah Dam Thresholds

Hulah Dam: days with 10 mm (0.39 in) or more of precipitation in 40 years, most in 1973 with 43.
Hulah Dam: days with 25 mm (0.98 in) or more of precipitation in 40 years, most in 1977 with 15.
Hulah Dam: days with 50 mm (1.97 in) or more of precipitation in 35 years, most in 1948 with 5.
Hulah Dam: days with a maximum temperature at or above 30 C (86 F) in 32 years, most in 1956 with 149.
19 fixed thresholds have at least one qualifying day at Hulah Dam.

Days at or above 30 C (86 F)

32 years with a qualifying day

Days per year at Hulah Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 149 in 1956.

Days at or above 30 C (86 F) per year at Hulah Dam
Year	Days	Decade average
1947	110	97
1948	94	97
1949	87	97
1950	72	110.5
1951	92	110.5
1952	127	110.5
1953	132	110.5
1954	130	110.5
1955	118	110.5
1956	149	110.5
1957	91	110.5
1958	90	110.5
1959	104	110.5
1960	101	96.6
1961	74	96.6
1962	113	96.6
1963	133	96.6
1964	97	96.6
1965	91	96.6
1966	101	96.6
1967	71	96.6
1968	87	96.6
1969	98	96.6
1970	94	89
1971	99	89
1972	96	89
1973	60	89
1974	72	89
1975	97	89
1976	82	89
1977	92	89
1978	109	89

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

First to last qualifying date each year at Hulah Dam
Year	First date	Last date
1947	1947-04-30	1947-10-22
1948	1948-04-17	1948-10-14
1949	1949-04-08	1949-10-21
1950	1950-04-22	1950-11-01
1951	1951-04-27	1951-10-04
1952	1952-04-30	1952-10-26
1953	1953-03-20	1953-10-18
1954	1954-04-04	1954-10-10
1955	1955-03-03	1955-10-20
1956	1956-03-05	1956-10-13
1957	1957-06-05	1957-10-01
1958	1958-04-24	1958-10-21
1959	1959-04-03	1959-09-29
1960	1960-04-07	1960-10-12
1961	1961-04-20	1961-10-13
1962	1962-02-13	1962-10-16
1963	1963-03-29	1963-10-27
1964	1964-04-13	1964-10-18
1965	1965-04-11	1965-10-11
1966	1966-04-01	1966-10-15
1967	1967-03-11	1967-10-07
1968	1968-03-30	1968-10-31
1969	1969-03-20	1969-10-05
1970	1970-04-28	1970-10-03
1971	1971-04-13	1971-10-13
1972	1972-04-07	1972-10-12
1973	1973-05-11	1973-10-24
1974	1974-04-01	1974-09-12
1975	1975-04-17	1975-10-22
1976	1976-04-03	1976-10-12
1977	1977-04-08	1977-10-28
1978	1978-05-12	1978-10-22

Every Fixed Threshold

Fixed thresholds at Hulah Dam
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	32	149	1956	109
35 C (95 F): Days	32	86	1954	52
40 C (104 F): Days	14	28	1954	4
45 C (113 F): Days	2	1	1954	1
90 F (32.2 C): Days	32	125	1956	85
100 F (37.8 C): Days	26	57	1956	23
110 F (43.3 C): Days	3	6	1954	5
0 C (32 F): Ice days (max	32	37	1978	37
0 C (32 F): Frost days (min	31	121	1964	116
-10 C (14 F): Days with min	31	40	1978	40
-20 C (-4 F): Days with min	11	4	1963	1
20 C (68 F): Tropical nights (min	31	81	1956	59
25 C (77 F): Days with min	26	13	1954	6
10 mm (0.39 in): Days with 10 mm or more rain	40	43	1973	12
25 mm (0.98 in): Days with 25 mm or more rain	40	15	1977	7
50 mm (1.97 in): Days with 50 mm or more rain	35	5	1948	2
100 mm (3.94 in): Days with 100 mm or more rain	9	2	1959	1
10 cm (3.9 in): Days with 10 cm or more snowfall	9	2	1948	2
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1970	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1947.

Download the Data

Data for Hulah Dam 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).

Hulah Dam Threshold Days by Year

Key Facts for Hulah Dam Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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