Mahukona 159 Threshold Days by Year

9 fixed thresholds counted per year at Mahukona 159 (USC00515721): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mahukona 159 Thresholds

Mahukona 159: days with a maximum temperature at or above 30 C (86 F) in 35 years, most in 1931 with 343.
Mahukona 159: days with a maximum temperature at or above 90 F (32.2 C) in 35 years, most in 1917 with 203.
Mahukona 159: nights with a minimum temperature at or above 20 C (68 F) in 35 years, most in 1938 with 335.
Mahukona 159: days with 10 mm (0.39 in) or more of precipitation in 29 years, most in 1950 with 22.
9 fixed thresholds have at least one qualifying day at Mahukona 159.

Days at or above 30 C (86 F)

35 years with a qualifying day

Days per year at Mahukona 159 with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 343 in 1931.

Days at or above 30 C (86 F) per year at Mahukona 159
Year	Days	Decade average
1913	271	245.3
1914	184	245.3
1915	163	245.3
1916	257	245.3
1917	322	245.3
1918	256	245.3
1919	264	245.3
1920	229	233.6
1921	238	233.6
1922	217	233.6
1925	250	233.6
1926	234	233.6
1930	273	233.3
1931	343	233.3
1932	331	233.3
1933	195	233.3
1934	221	233.3
1935	215	233.3
1936	194	233.3
1937	160	233.3
1938	168	233.3
1940	294	186.9
1941	240	186.9
1942	127	186.9
1945	149	186.9
1946	144	186.9
1947	168	186.9
1948	160	186.9
1949	213	186.9
1950	211	189.3
1951	169	189.3
1952	173	189.3
1953	204	189.3
1954	228	189.3
1955	151	189.3

For each year, a bar from the first to the last day at Mahukona 159 meeting 30 C (86 F).

First to last qualifying date each year at Mahukona 159
Year	First date	Last date
1913	1913-01-13	1913-12-29
1914	1914-02-09	1914-11-10
1915	1915-02-25	1915-12-29
1916	1916-01-03	1916-12-31
1917	1917-01-01	1917-12-30
1918	1918-01-01	1918-12-22
1919	1919-01-15	1919-12-09
1920	1920-04-04	1920-12-31
1921	1921-01-01	1921-12-30
1922	1922-01-14	1922-12-29
1925	1925-01-01	1925-12-17
1926	1926-01-17	1926-12-12
1930	1930-01-18	1930-12-31
1931	1931-01-01	1931-12-31
1932	1932-01-01	1932-12-31
1933	1933-01-01	1933-11-23
1934	1934-02-27	1934-12-29
1935	1935-02-04	1935-12-31
1936	1936-01-04	1936-11-19
1937	1937-03-17	1937-11-30
1938	1938-01-13	1938-11-22
1940	1940-01-01	1940-12-26
1941	1941-01-04	1941-12-27
1942	1942-04-09	1942-11-08
1945	1945-03-30	1945-12-24
1946	1946-03-10	1946-11-14
1947	1947-02-08	1947-12-13
1948	1948-01-21	1948-12-31
1949	1949-01-01	1949-11-23
1950	1950-01-09	1950-12-12
1951	1951-03-24	1951-11-04
1952	1952-05-11	1952-12-12
1953	1953-02-26	1953-12-27
1954	1954-01-24	1954-11-24
1955	1955-01-18	1955-12-28

Every Fixed Threshold

Fixed thresholds at Mahukona 159
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	35	343	1931	151
35 C (95 F): Days	14	18	1915	1
90 F (32.2 C): Days	35	203	1917	5
20 C (68 F): Tropical nights (min	35	335	1938	185
25 C (77 F): Days with min	15	68	1940	4
10 mm (0.39 in): Days with 10 mm or more rain	29	22	1950	8
25 mm (0.98 in): Days with 25 mm or more rain	28	8	1918	4
50 mm (1.97 in): Days with 50 mm or more rain	14	3	1916	2
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1916	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1913.

Download the Data

Data for Mahukona 159 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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.

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

Mahukona 159 Threshold Days by Year

Key Facts for Mahukona 159 Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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