El Niño and Hawaii winters

In Hilo, December through February precipitation averaged 18.81 inches during the 7 winters since 1950 that were strong El Niños, compared with 33.85 inches in other winters. 1 of the 7 strong winters finished above that other-winter average. In Hilo, the winter temperature difference between strong El Niño winters and other winters was within half a degree Fahrenheit.

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El Niño winter precipitation in Hawaii

Each city row shows the average December through February precipitation in strong El Niño winters, the average in all other winters, the change, and how many strong winters finished above the other-winter average.
City	Strong average	Other average	Change	Above
Hilo	18.81 in	33.85 in	-44%	1 of 7
Honolulu	5.03 in	8.51 in	-41%	1 of 7
Mauna Loa	2.65 in	4.32 in	-39%	1 of 5

Station figures come from GHCN-Daily (NOAA NCEI); strong winters are classified from CPC's RONI; winters cover 1950-51 through 2025-26.

El Niño winter temperature in Hawaii

Each city row shows the December through February mean temperature in strong El Niño winters, the mean in all other winters, and the difference.
City	Strong average	Other average	Difference (F)
Hilo	71.7°F	71.9°F	-0.2°F
Honolulu	73.2°F	73.8°F	-0.7°F
Mauna Loa	43.8°F	41.4°F	+2.4°F

Strong El Niño winters in Hawaii, winter by winter

For each city, the table shows December through February precipitation in each strong El Niño winter and the other-winter average for scale; the strong winters often disagreed.
City	1957-58	1965-66	1972-73	1982-83	1991-92	1997-98	2015-16	Other average
Hilo	28.03	35.15	12.97	8.52	17.67	10.64	18.68	33.85
Honolulu	8.50	13.09	4.87	3.59	3.03	1.43	0.70	8.51
Mauna Loa	3.85	4.72	3.91		0.41	0.35		4.32

Station figures come from GHCN-Daily (NOAA NCEI); strong winters are classified from CPC's RONI; winters cover 1950-51 through 2025-26.

Under 17 U.S.C. 105, no copyright attaches to the government-produced figures on this page, including reports, alerts, station observations, and normals, which were created by the National Weather Service and other NOAA offices. The notice that 17 U.S.C. 403 requires appears in this sentence. It does not imply endorsement by or affiliation with those agencies. See: Data sources and attribution.

How these figures work

Strong El Niño winters here are 1957-58, 1965-66, 1972-73, 1982-83, 1991-92, 1997-98, 2015-16, classified by the Relative Oceanic Niño Index. Each city is compared against its own station record: those strong winters against every other winter since 1950. A city appears after its station reports 3 or more strong winters and 10 or more other winters.