Ewa Beach Usgs 702.2 Weather Records (USC00511918)

Record envelope, standing records and threshold days for Ewa Beach Usgs 702.2 (USC00511918), Hawaii, United States, with 65 years of record.

Key Facts for Ewa Beach Usgs 702.2

Ewa Beach Usgs 702.2 (USC00511918) is a weather station in Hawaii, United States at 21.32 latitude and -158.00 longitude, 2 m (5 ft) above sea level.
The station reports from 1962 to 2026, 65 years of record.
1,464 records set at Ewa Beach Usgs 702.2 still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Ewa Beach Usgs 702.2 set a daily record precipitation of 6.1 mm (0.24 in) on 23 June 2026.

About the Station

Location: Hawaii, United States, 21.32 latitude, -158.00 longitude.
Elevation: 2 m (5 ft).
Period of record: 1962 to 2026, 65 years.
Eligible elements: tmax, tmin, 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 Ewa Beach Usgs 702.2. 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 Ewa Beach Usgs 702.2, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	30.6 C (87.1 F)	10.0 C (50.0 F)	n/a	n/a
Feb	31.1 C (88.0 F)	9.4 C (48.9 F)	n/a	n/a
Mar	31.7 C (89.1 F)	10.6 C (51.1 F)	n/a	n/a
Apr	31.7 C (89.1 F)	11.1 C (52.0 F)	n/a	n/a
May	32.2 C (90.0 F)	14.4 C (57.9 F)	n/a	n/a
Jun	33.9 C (93.0 F)	16.1 C (61.0 F)	n/a	n/a
Jul	34.4 C (93.9 F)	13.9 C (57.0 F)	n/a	n/a
Aug	35.0 C (95.0 F)	17.2 C (63.0 F)	n/a	n/a
Sep	36.1 C (97.0 F)	15.0 C (59.0 F)	n/a	n/a
Oct	34.4 C (93.9 F)	15.6 C (60.1 F)	n/a	n/a
Nov	32.8 C (91.0 F)	13.9 C (57.0 F)	n/a	n/a
Dec	31.7 C (89.1 F)	11.7 C (53.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Ewa Beach Usgs 702.2 still stand. 1981 holds the most, with 106.

Standing records at Ewa Beach Usgs 702.2 by the year they were set
Year set	Standing records
1962	32
1963	10
1964	2
1978	44
1979	73
1980	36
1981	106
1982	59
1983	88
1984	59
1985	61
1986	56
1987	35
1988	31
1989	33
1990	43
1991	31
1992	36
1993	42
1994	25
1995	26
1996	61
1997	27
1998	32
1999	22
2000	25
2001	24
2002	22
2003	36
2004	20
2005	23
2006	22
2007	14
2008	17
2009	23
2010	26
2011	25
2012	37
2013	27
2014	14
2015	39

Wettest Day of Each Month

Oct: 188.0 mm (7.4 in)

The wettest day on record for each calendar month at Ewa Beach Usgs 702.2. The most was 188.0 mm (7.4 in) on 4 October 1989.

Record daily precipitation for each month at Ewa Beach Usgs 702.2
Month	Record daily precipitation (mm)	Date
Jan	166.4 mm (6.6 in)	3 January 1969
Feb	131.6 mm (5.2 in)	15 February 1985
Mar	144.3 mm (5.7 in)	19 March 2006
Apr	86.4 mm (3.4 in)	20 April 1974
May	76.2 mm (3.0 in)	3 May 1965
Jun	39.4 mm (1.6 in)	16 June 1971
Jul	55.9 mm (2.2 in)	25 July 1986
Aug	54.6 mm (2.1 in)	4 August 2004
Sep	44.5 mm (1.8 in)	12 September 2008
Oct	188.0 mm (7.4 in)	4 October 1989
Nov	161.8 mm (6.4 in)	6 November 1996
Dec	144.3 mm (5.7 in)	15 December 1965

Period of Record Coverage

1962 to 2015

43 years of record at Ewa Beach Usgs 702.2, 1962 to 2015. 9 years have data for under 90 percent of days and are left out of rankings: 1962, 1963, 1964, 1975, 1976, 1978, 1979, 2008 and others.

Days with data per year at Ewa Beach Usgs 702.2
Year	Days with data	Share of year	Complete
1962	152	42%	No
1963	120	33%	No
1964	31	8%	No
1975	2	1%	No
1976	30	8%	No
1978	313	86%	No
1979	305	84%	No
1980	366	100%	Yes
1981	363	99%	Yes
1982	365	100%	Yes
1983	363	99%	Yes
1984	363	99%	Yes
1985	364	100%	Yes
1986	364	100%	Yes
1987	364	100%	Yes
1988	364	99%	Yes
1989	359	98%	Yes
1990	355	97%	Yes
1991	360	99%	Yes
1992	361	99%	Yes
1993	360	99%	Yes
1994	365	100%	Yes
1995	365	100%	Yes
1996	366	100%	Yes
1997	365	100%	Yes
1998	364	100%	Yes
1999	365	100%	Yes
2000	366	100%	Yes
2001	364	100%	Yes
2002	364	100%	Yes
2003	362	99%	Yes
2004	365	100%	Yes
2005	364	100%	Yes
2006	365	100%	Yes
2007	365	100%	Yes
2008	327	89%	No
2009	346	95%	Yes
2010	351	96%	Yes
2011	359	98%	Yes
2012	358	98%	Yes
2013	363	99%	Yes
2014	354	97%	Yes
2015	190	52%	No

Latest Records

Latest records at Ewa Beach Usgs 702.2
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
23 June 2026	Ewa Beach Usgs 702.2, US	daily rain	6.1 mm (0.24 in)	3.6 mm (0.14 in)	13 years	18 of 100 (Routine)
7 April 2026	Ewa Beach Usgs 702.2, US	daily rain	26.7 mm (1.1 in)	14.5 mm (0.6 in)	44 years	34 of 100 (Routine)
14 January 2026	Ewa Beach Usgs 702.2, US	daily rain	20.3 mm (0.8 in)	9.6 mm (0.38 in)	52 years	20 of 100 (Routine)
30 August 2017	Ewa Beach Usgs 702.2, US	daily rain	16.5 mm (0.6 in)	15.2 mm (0.6 in)	44 years	20 of 100 (Routine)
22 August 2017	Ewa Beach Usgs 702.2, US	daily rain (Tie)	2.5 mm (0.10 in)	tie	39 years	4 of 100 (Routine)
9 May 2017	Ewa Beach Usgs 702.2, US	daily rain	15.2 mm (0.6 in)	1.7 mm (0.07 in)	6 years	7 of 100 (Routine)
1 May 2017	Ewa Beach Usgs 702.2, US	daily rain	27.7 mm (1.1 in)	26.7 mm (1.1 in)	47 years	49 of 100 (Notable)
18 April 2017	Ewa Beach Usgs 702.2, US	daily rain	15.2 mm (0.6 in)	1.2 mm (0.05 in)	48 years	20 of 100 (Routine)
1 March 2017	Ewa Beach Usgs 702.2, US	daily rain	111.8 mm (4.4 in)	68.4 mm (2.7 in)	54 years	61 of 100 (Major)
22 November 2016	Ewa Beach Usgs 702.2, US	daily rain	17.8 mm (0.7 in)	8.4 mm (0.33 in)	11 years	12 of 100 (Routine)
9 June 2016	Ewa Beach Usgs 702.2, US	daily rain	1.3 mm (0.05 in)	0.8 mm (0.03 in)	42 years	18 of 100 (Routine)
26 May 2016	Ewa Beach Usgs 702.2, US	daily rain	22.9 mm (0.9 in)	21.4 mm (0.8 in)	36 years	20 of 100 (Routine)
29 October 2015	Ewa Beach Usgs 702.2, US	daily high max	31.7 C (89.1 F)	0.6 C (1.1 F)	34 years	19 of 100 (Routine)
26 October 2015	Ewa Beach Usgs 702.2, US	daily high max	32.2 C (90.0 F)	0.5 C (0.9 F)	36 years	19 of 100 (Routine)
25 October 2015	Ewa Beach Usgs 702.2, US	daily high max	32.2 C (90.0 F)	0.5 C (0.9 F)	21 years	14 of 100 (Routine)
22 October 2015	Ewa Beach Usgs 702.2, US	daily rain	3.8 mm (0.15 in)	1.3 mm (0.05 in)	9 years	7 of 100 (Routine)
21 October 2015	Ewa Beach Usgs 702.2, US	daily high max (Tie)	31.7 C (89.1 F)	tie	36 years	3 of 100 (Routine)
20 October 2015	Ewa Beach Usgs 702.2, US	daily high max	32.8 C (91.0 F)	0.6 C (1.1 F)	36 years	20 of 100 (Routine)
19 October 2015	Ewa Beach Usgs 702.2, US	daily high max	32.8 C (91.0 F)	0.6 C (1.1 F)	36 years	19 of 100 (Routine)
8 October 2015	Ewa Beach Usgs 702.2, US	daily low min	18.3 C (64.9 F)	0.6 C (1.1 F)	25 years	15 of 100 (Routine)

Climate Trend

35 complete years, 1980 to 2014

One stripe for each of 35 complete years at Ewa Beach Usgs 702.2, 1980 to 2014. Blue stripes are years cooler than the station's own mean of 24.4 C (75.9 F); red stripes are warmer. The coolest year was 1983, at 23.6 C (74.6 F), and the warmest was 1988, at 25.0 C (76.9 F). The strongest colour marks a difference of 0.8 C (1.4 F).

Annual mean temperature at Ewa Beach Usgs 702.2 as warming stripes, 1980 to 2014
Year	Annual mean temperature	Difference from the station mean
1980	24.6 C	+0.20 C
1981	24.8 C	+0.41 C
1982	24.2 C	-0.16 C
1983	23.6 C	-0.73 C
1984	24.8 C	+0.45 C
1985	23.9 C	-0.51 C
1986	24.8 C	+0.45 C
1987	24.4 C	+0.02 C
1988	25.0 C	+0.58 C
1989	24.2 C	-0.20 C
1990	24.4 C	-0.02 C
1991	24.4 C	0.00 C
1992	24.4 C	+0.02 C
1993	24.2 C	-0.14 C
1994	24.7 C	+0.31 C
1995	24.8 C	+0.44 C
1996	24.8 C	+0.39 C
1997	24.2 C	-0.18 C
1998	23.8 C	-0.55 C
1999	23.9 C	-0.44 C
2000	24.3 C	-0.12 C
2001	24.7 C	+0.34 C
2002	24.6 C	+0.26 C
2003	24.8 C	+0.47 C
2004	24.8 C	+0.44 C
2005	24.5 C	+0.16 C
2006	24.6 C	+0.25 C
2007	24.9 C	+0.57 C
2008	24.4 C	+0.05 C
2009	23.9 C	-0.44 C
2010	23.9 C	-0.43 C
2011	23.8 C	-0.59 C
2012	23.7 C	-0.63 C
2013	23.9 C	-0.48 C
2014	24.3 C	-0.07 C

The fitted trend in annual mean temperature here over 1980 to 2014 is -0.1 C (-0.2 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.4 to 0.1) per decade. The slope is a straight line fitted to 35 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Ewa Beach Usgs 702.2
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	-0.1 C (-0.2 to 0.1) per decade	-0.1 F (-0.4 to 0.1) per decade	1980 to 2014	35	Not clearly different from zero
Mean daily maximum	-0.3 C (-0.5 to -0.2) per decade	-0.6 F (-0.9 to -0.3) per decade	1980 to 2014	35	Fall
Mean daily minimum	0.17 C (-0.01 to 0.36) per decade	0.31 F (-0.02 to 0.65) per decade	1980 to 2014	35	Not clearly different from zero

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1962 to 2026

Yearly extremes at Ewa Beach Usgs 702.2: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	36.1 C (97.0 F)	1988	32.8 C (91.0 F)	43
Coldest night (TNn)	9.4 C (48.9 F)	1981	12.8 C (55.0 F)	43
Wettest day (Rx1day)	188.0 mm (7.4 in)	1989	65.0 mm (2.6 in)	59
Wettest five days (Rx5day)	304.0 mm (12.0 in)	1978	108.3 mm (4.3 in)	58
Longest dry spell (CDD)	89 days	1998	39 days	59

Hottest day (TXx)

The hottest day of the year at Ewa Beach Usgs 702.2, 1962 to 2026. The record is 36.1 C (97.0 F) in 1988, marked on the chart; the median year is 32.8 C (91.0 F).

Hottest day (TXx) at Ewa Beach Usgs 702.2 by year
Year	Hottest day (TXx)
1962	33.3 C (91.9 F)
1963	31.1 C (88.0 F)
1964	28.9 C (84.0 F)
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	28.9 C (84.0 F)
1976	28.9 C (84.0 F)
1977	n/a
1978	33.3 C (91.9 F)
1979	33.9 C (93.0 F)
1980	33.3 C (91.9 F)
1981	33.9 C (93.0 F)
1982	34.4 C (93.9 F)
1983	32.8 C (91.0 F)
1984	34.4 C (93.9 F)
1985	33.9 C (93.0 F)
1986	34.4 C (93.9 F)
1987	33.9 C (93.0 F)
1988	36.1 C (97.0 F)
1989	33.3 C (91.9 F)
1990	33.3 C (91.9 F)
1991	33.3 C (91.9 F)
1992	32.8 C (91.0 F)
1993	33.3 C (91.9 F)
1994	33.3 C (91.9 F)
1995	32.8 C (91.0 F)
1996	32.8 C (91.0 F)
1997	32.8 C (91.0 F)
1998	32.2 C (90.0 F)
1999	31.7 C (89.1 F)
2000	32.2 C (90.0 F)
2001	32.8 C (91.0 F)
2002	34.4 C (93.9 F)
2003	32.8 C (91.0 F)
2004	32.8 C (91.0 F)
2005	32.8 C (91.0 F)
2006	32.8 C (91.0 F)
2007	32.8 C (91.0 F)
2008	32.2 C (90.0 F)
2009	33.3 C (91.9 F)
2010	31.7 C (89.1 F)
2011	31.7 C (89.1 F)
2012	31.7 C (89.1 F)
2013	32.2 C (90.0 F)
2014	33.9 C (93.0 F)
2015	35.0 C (95.0 F)
2016	n/a
2017	n/a
2024	n/a
2025	n/a
2026	n/a

Coldest night (TNn)

The coldest night of the year at Ewa Beach Usgs 702.2, 1962 to 2026. The record is 9.4 C (48.9 F) in 1981, marked on the chart; the median year is 12.8 C (55.0 F).

Coldest night (TNn) at Ewa Beach Usgs 702.2 by year
Year	Coldest night (TNn)
1962	11.7 C (53.1 F)
1963	13.3 C (55.9 F)
1964	15.6 C (60.1 F)
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	17.8 C (64.0 F)
1976	14.4 C (57.9 F)
1977	n/a
1978	12.8 C (55.0 F)
1979	12.2 C (54.0 F)
1980	12.2 C (54.0 F)
1981	9.4 C (48.9 F)
1982	10.6 C (51.1 F)
1983	11.7 C (53.1 F)
1984	13.3 C (55.9 F)
1985	11.1 C (52.0 F)
1986	10.0 C (50.0 F)
1987	12.2 C (54.0 F)
1988	12.8 C (55.0 F)
1989	12.8 C (55.0 F)
1990	11.7 C (53.1 F)
1991	12.2 C (54.0 F)
1992	12.8 C (55.0 F)
1993	11.7 C (53.1 F)
1994	11.7 C (53.1 F)
1995	12.8 C (55.0 F)
1996	12.2 C (54.0 F)
1997	12.8 C (55.0 F)
1998	11.7 C (53.1 F)
1999	13.3 C (55.9 F)
2000	12.8 C (55.0 F)
2001	13.9 C (57.0 F)
2002	14.4 C (57.9 F)
2003	12.2 C (54.0 F)
2004	13.3 C (55.9 F)
2005	10.6 C (51.1 F)
2006	13.9 C (57.0 F)
2007	13.3 C (55.9 F)
2008	14.4 C (57.9 F)
2009	12.8 C (55.0 F)
2010	12.8 C (55.0 F)
2011	13.3 C (55.9 F)
2012	13.3 C (55.9 F)
2013	11.1 C (52.0 F)
2014	12.2 C (54.0 F)
2015	11.7 C (53.1 F)
2016	n/a
2017	n/a
2024	n/a
2025	n/a
2026	n/a

Wettest day (Rx1day)

The wettest day of the year at Ewa Beach Usgs 702.2, 1962 to 2026. The record is 188.0 mm (7.4 in) in 1989, marked on the chart; the median year is 65.0 mm (2.6 in).

Wettest day (Rx1day) at Ewa Beach Usgs 702.2 by year
Year	Wettest day (Rx1day)
1962	47.8 mm (1.9 in)
1963	150.1 mm (5.9 in)
1964	64.8 mm (2.6 in)
1965	144.3 mm (5.7 in)
1966	53.3 mm (2.1 in)
1967	81.5 mm (3.2 in)
1968	118.1 mm (4.6 in)
1969	166.4 mm (6.6 in)
1970	61.7 mm (2.4 in)
1971	65.0 mm (2.6 in)
1972	79.2 mm (3.1 in)
1973	38.1 mm (1.5 in)
1974	86.4 mm (3.4 in)
1975	89.4 mm (3.5 in)
1976	78.7 mm (3.1 in)
1977	61.0 mm (2.4 in)
1978	149.9 mm (5.9 in)
1979	51.1 mm (2.0 in)
1980	93.0 mm (3.7 in)
1981	53.8 mm (2.1 in)
1982	103.1 mm (4.1 in)
1983	24.4 mm (1.0 in)
1984	101.6 mm (4.0 in)
1985	131.6 mm (5.2 in)
1986	104.1 mm (4.1 in)
1987	114.8 mm (4.5 in)
1988	100.3 mm (3.9 in)
1989	188.0 mm (7.4 in)
1990	50.8 mm (2.0 in)
1991	86.4 mm (3.4 in)
1992	61.0 mm (2.4 in)
1993	34.3 mm (1.4 in)
1994	71.1 mm (2.8 in)
1995	27.7 mm (1.1 in)
1996	161.8 mm (6.4 in)
1997	63.5 mm (2.5 in)
1998	16.8 mm (0.7 in)
1999	27.2 mm (1.1 in)
2000	51.3 mm (2.0 in)
2001	46.7 mm (1.8 in)
2002	51.3 mm (2.0 in)
2003	51.1 mm (2.0 in)
2004	90.2 mm (3.6 in)
2005	44.5 mm (1.8 in)
2006	144.3 mm (5.7 in)
2007	86.4 mm (3.4 in)
2008	55.9 mm (2.2 in)
2009	36.8 mm (1.4 in)
2010	101.6 mm (4.0 in)
2011	87.4 mm (3.4 in)
2012	71.9 mm (2.8 in)
2013	61.0 mm (2.4 in)
2014	101.6 mm (4.0 in)
2015	33.0 mm (1.3 in)
2016	22.9 mm (0.9 in)
2017	111.8 mm (4.4 in)
2024	0.0 mm (0.00 in)
2025	5.8 mm (0.23 in)
2026	52.3 mm (2.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Ewa Beach Usgs 702.2, 1962 to 2026. The record is 304.0 mm (12.0 in) in 1978, marked on the chart; the median year is 108.3 mm (4.3 in).

Wettest five days (Rx5day) at Ewa Beach Usgs 702.2 by year
Year	Wettest five days (Rx5day)
1962	63.2 mm (2.5 in)
1963	190.1 mm (7.5 in)
1964	108.0 mm (4.3 in)
1965	292.8 mm (11.5 in)
1966	178.8 mm (7.0 in)
1967	96.0 mm (3.8 in)
1968	140.9 mm (5.5 in)
1969	247.2 mm (9.7 in)
1970	73.4 mm (2.9 in)
1971	125.2 mm (4.9 in)
1972	105.9 mm (4.2 in)
1973	79.2 mm (3.1 in)
1974	92.4 mm (3.6 in)
1975	212.1 mm (8.4 in)
1976	191.7 mm (7.5 in)
1977	141.2 mm (5.6 in)
1978	304.0 mm (12.0 in)
1979	78.5 mm (3.1 in)
1980	205.2 mm (8.1 in)
1981	63.7 mm (2.5 in)
1982	239.5 mm (9.4 in)
1983	34.6 mm (1.4 in)
1984	128.0 mm (5.0 in)
1985	147.1 mm (5.8 in)
1986	125.9 mm (5.0 in)
1987	196.3 mm (7.7 in)
1988	129.8 mm (5.1 in)
1989	222.4 mm (8.8 in)
1990	92.4 mm (3.6 in)
1991	145.6 mm (5.7 in)
1992	130.1 mm (5.1 in)
1993	60.0 mm (2.4 in)
1994	155.3 mm (6.1 in)
1995	48.1 mm (1.9 in)
1996	224.2 mm (8.8 in)
1997	77.2 mm (3.0 in)
1998	20.9 mm (0.8 in)
1999	54.9 mm (2.2 in)
2000	74.7 mm (2.9 in)
2001	69.3 mm (2.7 in)
2002	71.2 mm (2.8 in)
2003	65.1 mm (2.6 in)
2004	170.0 mm (6.7 in)
2005	51.6 mm (2.0 in)
2006	253.8 mm (10.0 in)
2007	104.8 mm (4.1 in)
2008	186.7 mm (7.4 in)
2009	49.3 mm (1.9 in)
2010	184.4 mm (7.3 in)
2011	108.5 mm (4.3 in)
2012	114.1 mm (4.5 in)
2013	80.8 mm (3.2 in)
2014	146.8 mm (5.8 in)
2015	36.9 mm (1.5 in)
2016	17.8 mm (0.7 in)
2017	15.2 mm (0.6 in)
2024	n/a
2025	4.9 mm (0.19 in)
2026	52.3 mm (2.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Ewa Beach Usgs 702.2, 1962 to 2026. The record is 89 days in 1998, marked on the chart; the median year is 39 days.

Longest dry spell (CDD) at Ewa Beach Usgs 702.2 by year
Year	Longest dry spell (CDD)
1962	46 days
1963	27 days
1964	64 days
1965	33 days
1966	37 days
1967	34 days
1968	45 days
1969	49 days
1970	43 days
1971	65 days
1972	27 days
1973	33 days
1974	42 days
1975	59 days
1976	35 days
1977	57 days
1978	32 days
1979	47 days
1980	43 days
1981	42 days
1982	26 days
1983	34 days
1984	60 days
1985	21 days
1986	24 days
1987	25 days
1988	28 days
1989	67 days
1990	54 days
1991	33 days
1992	24 days
1993	41 days
1994	58 days
1995	55 days
1996	40 days
1997	59 days
1998	89 days
1999	56 days
2000	41 days
2001	79 days
2002	60 days
2003	37 days
2004	25 days
2005	30 days
2006	53 days
2007	39 days
2008	33 days
2009	29 days
2010	41 days
2011	47 days
2012	54 days
2013	26 days
2014	20 days
2015	26 days
2016	26 days
2017	10 days
2024	3 days
2025	27 days
2026	20 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

52 years, 1963 to 2014

A day with at least 74.7 mm (2.9 in) of rain is expected about once in 2 years. A day with at least 210.8 mm (8.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Ewa Beach Usgs 702.2: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	74.7 mm (2.9 in)
5 years	111.4 mm (4.4 in)
10 years	135.6 mm (5.3 in)
25 years	166.0 mm (6.5 in)
50 years	188.6 mm (7.4 in)
100 years	210.8 mm (8.3 in)	Longer than the 52 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, 52 years of values from 1963 to 2014.

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: 188.0 mm (7.4 in) in 1989; 166.4 mm (6.6 in) in 1969; 161.8 mm (6.4 in) in 1996.

Download the Data

Data for Ewa Beach Usgs 702.2 standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ewa Beach Usgs 702.2 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). Records are computed by this site and are not official.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).