Hamakuapoko 485 Weather Records (USC00511086)

Record envelope, standing records and threshold days for Hamakuapoko 485 (USC00511086), Hawaii, United States, with 75 years of record.

Key Facts for Hamakuapoko 485

Hamakuapoko 485 (USC00511086) is a weather station in Hawaii, United States at 20.92 latitude and -156.34 longitude, 92 m (303 ft) above sea level.
The station reports from 1942 to 2016, 75 years of record.
0 records set at Hamakuapoko 485 still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Hamakuapoko 485 set a daily record precipitation of 14.2 mm (0.6 in) on 2 October 2016.

About the Station

Location: Hawaii, United States, 20.92 latitude, -156.34 longitude.
Elevation: 92 m (303 ft).
Period of record: 1942 to 2016, 75 years.
Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Hamakuapoko 485. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Hamakuapoko 485, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	n/a	n/a	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Which Years Hold Standing Records

0 standing records

0 records at Hamakuapoko 485 still stand.

Wettest Day of Each Month

Jan: 202.2 mm (8.0 in)

The wettest day on record for each calendar month at Hamakuapoko 485. The most was 202.2 mm (8.0 in) on 29 January 1971.

Record daily precipitation for each month at Hamakuapoko 485
Month	Record daily precipitation (mm)	Date
Jan	202.2 mm (8.0 in)	29 January 1971
Feb	131.1 mm (5.2 in)	26 February 1956
Mar	143.5 mm (5.6 in)	15 March 1968
Apr	107.7 mm (4.2 in)	8 April 1989
May	94.0 mm (3.7 in)	6 May 1987
Jun	40.1 mm (1.6 in)	30 June 1967
Jul	40.4 mm (1.6 in)	12 July 1965
Aug	78.7 mm (3.1 in)	2 August 1982
Sep	86.4 mm (3.4 in)	15 September 2005
Oct	91.4 mm (3.6 in)	31 October 1978
Nov	160.0 mm (6.3 in)	12 November 1978
Dec	110.5 mm (4.4 in)	11 December 1951

Latest Records

Latest records at Hamakuapoko 485
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
2 October 2016	Hamakuapoko 485, US	daily rain	14.2 mm (0.6 in)	0.7 mm (0.03 in)	53 years	20 of 100 (Routine)
23 September 2016	Hamakuapoko 485, US	daily rain	29.2 mm (1.1 in)	11.4 mm (0.4 in)	12 years	31 of 100 (Routine)
14 September 2016	Hamakuapoko 485, US	daily rain	59.7 mm (2.4 in)	52.1 mm (2.1 in)	15 years	51 of 100 (Notable)
13 September 2016	Hamakuapoko 485, US	daily rain	27.9 mm (1.1 in)	19.3 mm (0.8 in)	29 years	51 of 100 (Notable)
28 August 2016	Hamakuapoko 485, US	daily rain	23.6 mm (0.9 in)	6.3 mm (0.25 in)	16 years	20 of 100 (Routine)
24 July 2016	Hamakuapoko 485, US	daily rain	38.6 mm (1.5 in)	21.3 mm (0.8 in)	23 years	53 of 100 (Notable)
1 June 2016	Hamakuapoko 485, US	daily rain	19.6 mm (0.8 in)	1.8 mm (0.07 in)	1 year	11 of 100 (Routine)
10 May 2016	Hamakuapoko 485, US	daily rain	40.1 mm (1.6 in)	24.6 mm (1.0 in)	48 years	56 of 100 (Notable)
8 May 2016	Hamakuapoko 485, US	daily rain	44.5 mm (1.8 in)	5.9 mm (0.23 in)	31 years	24 of 100 (Routine)
18 April 2016	Hamakuapoko 485, US	daily rain	33.0 mm (1.3 in)	14.7 mm (0.6 in)	62 years	39 of 100 (Notable)
6 April 2016	Hamakuapoko 485, US	daily rain	30.0 mm (1.2 in)	0.8 mm (0.03 in)	39 years	18 of 100 (Routine)
20 November 2015	Hamakuapoko 485, US	daily rain	47.0 mm (1.9 in)	16.5 mm (0.6 in)	40 years	32 of 100 (Routine)
20 September 2015	Hamakuapoko 485, US	daily rain	33.0 mm (1.3 in)	15.0 mm (0.6 in)	44 years	48 of 100 (Notable)
17 August 2015	Hamakuapoko 485, US	daily rain	19.1 mm (0.8 in)	4.6 mm (0.18 in)	58 years	20 of 100 (Routine)
10 July 2015	Hamakuapoko 485, US	daily rain	33.0 mm (1.3 in)	17.3 mm (0.7 in)	72 years	61 of 100 (Major)
1 June 2015	Hamakuapoko 485, US	daily rain	17.8 mm (0.7 in)	3.8 mm (0.15 in)	56 years	20 of 100 (Routine)
27 April 2015	Hamakuapoko 485, US	daily rain	72.4 mm (2.9 in)	15.2 mm (0.6 in)	28 years	30 of 100 (Routine)
6 March 2015	Hamakuapoko 485, US	daily rain	32.5 mm (1.3 in)	2.0 mm (0.08 in)	40 years	20 of 100 (Routine)
5 March 2015	Hamakuapoko 485, US	daily rain	53.3 mm (2.1 in)	1.2 mm (0.05 in)	38 years	18 of 100 (Routine)
23 December 2014	Hamakuapoko 485, US	daily rain	94.0 mm (3.7 in)	76.2 mm (3.0 in)	15 years	51 of 100 (Notable)

Extremes by Year

1942 to 2016

Yearly extremes at Hamakuapoko 485: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	202.2 mm (8.0 in)	1971	75.7 mm (3.0 in)	75
Wettest five days (Rx5day)	338.9 mm (13.3 in)	1989	128.3 mm (5.1 in)	75
Longest dry spell (CDD)	36 days	1974	17 days	75

Wettest day (Rx1day)

The wettest day of the year at Hamakuapoko 485, 1942 to 2016. The record is 202.2 mm (8.0 in) in 1971, marked on the chart; the median year is 75.7 mm (3.0 in).

Wettest day (Rx1day) at Hamakuapoko 485 by year
Year	Wettest day (Rx1day)
1942	80.0 mm (3.1 in)
1943	68.3 mm (2.7 in)
1944	83.3 mm (3.3 in)
1945	39.4 mm (1.6 in)
1946	77.2 mm (3.0 in)
1947	54.6 mm (2.1 in)
1948	84.6 mm (3.3 in)
1949	94.7 mm (3.7 in)
1950	90.9 mm (3.6 in)
1951	110.5 mm (4.4 in)
1952	110.5 mm (4.4 in)
1953	60.7 mm (2.4 in)
1954	52.1 mm (2.1 in)
1955	83.1 mm (3.3 in)
1956	131.1 mm (5.2 in)
1957	76.5 mm (3.0 in)
1958	66.5 mm (2.6 in)
1959	96.8 mm (3.8 in)
1960	61.0 mm (2.4 in)
1961	69.6 mm (2.7 in)
1962	58.9 mm (2.3 in)
1963	78.2 mm (3.1 in)
1964	51.3 mm (2.0 in)
1965	95.8 mm (3.8 in)
1966	39.6 mm (1.6 in)
1967	77.5 mm (3.1 in)
1968	143.5 mm (5.6 in)
1969	85.6 mm (3.4 in)
1970	94.0 mm (3.7 in)
1971	202.2 mm (8.0 in)
1972	87.9 mm (3.5 in)
1973	44.5 mm (1.8 in)
1974	77.5 mm (3.1 in)
1975	49.3 mm (1.9 in)
1976	53.3 mm (2.1 in)
1977	40.6 mm (1.6 in)
1978	160.0 mm (6.3 in)
1979	140.5 mm (5.5 in)
1980	86.9 mm (3.4 in)
1981	49.5 mm (1.9 in)
1982	78.7 mm (3.1 in)
1983	68.6 mm (2.7 in)
1984	34.3 mm (1.4 in)
1985	73.7 mm (2.9 in)
1986	55.6 mm (2.2 in)
1987	94.0 mm (3.7 in)
1988	102.6 mm (4.0 in)
1989	107.7 mm (4.2 in)
1990	111.8 mm (4.4 in)
1991	45.0 mm (1.8 in)
1992	75.7 mm (3.0 in)
1993	53.6 mm (2.1 in)
1994	123.2 mm (4.9 in)
1995	41.9 mm (1.6 in)
1996	66.0 mm (2.6 in)
1997	66.8 mm (2.6 in)
1998	29.7 mm (1.2 in)
1999	69.9 mm (2.8 in)
2000	50.8 mm (2.0 in)
2001	47.8 mm (1.9 in)
2002	82.6 mm (3.3 in)
2003	53.3 mm (2.1 in)
2004	95.3 mm (3.8 in)
2005	86.4 mm (3.4 in)
2006	91.4 mm (3.6 in)
2007	68.3 mm (2.7 in)
2008	90.9 mm (3.6 in)
2009	62.7 mm (2.5 in)
2010	85.9 mm (3.4 in)
2011	63.5 mm (2.5 in)
2012	57.1 mm (2.2 in)
2013	61.0 mm (2.4 in)
2014	94.0 mm (3.7 in)
2015	72.4 mm (2.9 in)
2016	59.7 mm (2.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Hamakuapoko 485, 1942 to 2016. The record is 338.9 mm (13.3 in) in 1989, marked on the chart; the median year is 128.3 mm (5.1 in).

Wettest five days (Rx5day) at Hamakuapoko 485 by year
Year	Wettest five days (Rx5day)
1942	221.0 mm (8.7 in)
1943	103.7 mm (4.1 in)
1944	144.0 mm (5.7 in)
1945	59.0 mm (2.3 in)
1946	187.0 mm (7.4 in)
1947	117.8 mm (4.6 in)
1948	290.1 mm (11.4 in)
1949	132.8 mm (5.2 in)
1950	211.1 mm (8.3 in)
1951	148.6 mm (5.9 in)
1952	111.8 mm (4.4 in)
1953	87.6 mm (3.4 in)
1954	85.4 mm (3.4 in)
1955	162.1 mm (6.4 in)
1956	211.9 mm (8.3 in)
1957	134.9 mm (5.3 in)
1958	129.0 mm (5.1 in)
1959	166.5 mm (6.6 in)
1960	110.8 mm (4.4 in)
1961	168.1 mm (6.6 in)
1962	88.2 mm (3.5 in)
1963	106.5 mm (4.2 in)
1964	106.4 mm (4.2 in)
1965	193.2 mm (7.6 in)
1966	93.2 mm (3.7 in)
1967	109.0 mm (4.3 in)
1968	216.1 mm (8.5 in)
1969	142.8 mm (5.6 in)
1970	160.0 mm (6.3 in)
1971	230.9 mm (9.1 in)
1972	101.8 mm (4.0 in)
1973	79.0 mm (3.1 in)
1974	144.8 mm (5.7 in)
1975	62.0 mm (2.4 in)
1976	103.6 mm (4.1 in)
1977	90.7 mm (3.6 in)
1978	289.8 mm (11.4 in)
1979	213.7 mm (8.4 in)
1980	228.6 mm (9.0 in)
1981	97.8 mm (3.9 in)
1982	145.8 mm (5.7 in)
1983	157.5 mm (6.2 in)
1984	76.0 mm (3.0 in)
1985	105.5 mm (4.2 in)
1986	118.6 mm (4.7 in)
1987	140.3 mm (5.5 in)
1988	132.4 mm (5.2 in)
1989	338.9 mm (13.3 in)
1990	202.7 mm (8.0 in)
1991	93.9 mm (3.7 in)
1992	92.4 mm (3.6 in)
1993	106.9 mm (4.2 in)
1994	238.8 mm (9.4 in)
1995	62.2 mm (2.4 in)
1996	105.2 mm (4.1 in)
1997	111.0 mm (4.4 in)
1998	107.4 mm (4.2 in)
1999	139.0 mm (5.5 in)
2000	120.9 mm (4.8 in)
2001	80.3 mm (3.2 in)
2002	158.8 mm (6.3 in)
2003	104.9 mm (4.1 in)
2004	190.3 mm (7.5 in)
2005	118.1 mm (4.6 in)
2006	108.4 mm (4.3 in)
2007	109.5 mm (4.3 in)
2008	184.5 mm (7.3 in)
2009	85.4 mm (3.4 in)
2010	148.1 mm (5.8 in)
2011	109.7 mm (4.3 in)
2012	106.1 mm (4.2 in)
2013	128.3 mm (5.1 in)
2014	160.5 mm (6.3 in)
2015	163.0 mm (6.4 in)
2016	133.4 mm (5.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at Hamakuapoko 485, 1942 to 2016. The record is 36 days in 1974, marked on the chart; the median year is 17 days.

Longest dry spell (CDD) at Hamakuapoko 485 by year
Year	Longest dry spell (CDD)
1942	14 days
1943	20 days
1944	12 days
1945	25 days
1946	12 days
1947	15 days
1948	16 days
1949	14 days
1950	16 days
1951	17 days
1952	9 days
1953	17 days
1954	12 days
1955	15 days
1956	16 days
1957	19 days
1958	11 days
1959	15 days
1960	13 days
1961	19 days
1962	30 days
1963	11 days
1964	17 days
1965	18 days
1966	11 days
1967	28 days
1968	12 days
1969	14 days
1970	14 days
1971	17 days
1972	15 days
1973	17 days
1974	36 days
1975	12 days
1976	16 days
1977	18 days
1978	13 days
1979	12 days
1980	20 days
1981	25 days
1982	25 days
1983	23 days
1984	27 days
1985	20 days
1986	18 days
1987	18 days
1988	11 days
1989	12 days
1990	20 days
1991	17 days
1992	17 days
1993	14 days
1994	15 days
1995	21 days
1996	24 days
1997	25 days
1998	26 days
1999	19 days
2000	16 days
2001	16 days
2002	23 days
2003	26 days
2004	18 days
2005	20 days
2006	15 days
2007	13 days
2008	30 days
2009	20 days
2010	13 days
2011	25 days
2012	24 days
2013	23 days
2014	11 days
2015	18 days
2016	13 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Rainfall Return Levels

74 years, 1942 to 2015

A day with at least 72.8 mm (2.9 in) of rain is expected about once in 2 years. A day with at least 172.9 mm (6.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Hamakuapoko 485: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	72.8 mm (2.9 in)
5 years	98.8 mm (3.9 in)
10 years	116.4 mm (4.6 in)
25 years	138.9 mm (5.5 in)
50 years	155.8 mm (6.1 in)
100 years	172.9 mm (6.8 in)	Longer than the 74 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 74 years of values from 1942 to 2015.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 202.2 mm (8.0 in) in 1971; 160.0 mm (6.3 in) in 1978; 143.5 mm (5.6 in) in 1968.

Download the Data

Data for Hamakuapoko 485 standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Hamakuapoko 485 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). Records are computed by this site and are not official.

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

Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	n/a	n/a	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	n/a	n/a	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a