Waiawa 943 Weather Records (USC00519253)

Record envelope, standing records and threshold days for Waiawa 943 (USC00519253), Hawaii, United States, with 96 years of record.

Key Facts for Waiawa 943

Waiawa 943 (USC00519253) is a weather station in Hawaii, United States at 21.99 latitude and -159.73 longitude, 3 m (10 ft) above sea level.
The station reports from 1905 to 2000, 96 years of record.
1,464 records set at Waiawa 943 still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Waiawa 943 set a daily record precipitation of 22.9 mm (0.9 in) on 28 June 2000.

About the Station

Location: Hawaii, United States, 21.99 latitude, -159.73 longitude.
Elevation: 3 m (10 ft).
Period of record: 1905 to 2000, 96 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 Waiawa 943. 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 Waiawa 943, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	31.7 C (89.1 F)	9.4 C (48.9 F)	n/a	n/a
Feb	35.6 C (96.1 F)	11.1 C (52.0 F)	n/a	n/a
Mar	37.2 C (99.0 F)	10.6 C (51.1 F)	n/a	n/a
Apr	31.1 C (88.0 F)	9.4 C (48.9 F)	n/a	n/a
May	33.9 C (93.0 F)	12.2 C (54.0 F)	n/a	n/a
Jun	32.8 C (91.0 F)	15.6 C (60.1 F)	n/a	n/a
Jul	36.7 C (98.1 F)	15.0 C (59.0 F)	n/a	n/a
Aug	34.4 C (93.9 F)	15.0 C (59.0 F)	n/a	n/a
Sep	35.0 C (95.0 F)	15.6 C (60.1 F)	n/a	n/a
Oct	33.3 C (91.9 F)	11.1 C (52.0 F)	n/a	n/a
Nov	33.9 C (93.0 F)	11.1 C (52.0 F)	n/a	n/a
Dec	32.2 C (90.0 F)	10.0 C (50.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Waiawa 943 still stand. 1934 holds the most, with 233.

Standing records at Waiawa 943 by the year they were set
Year set	Standing records
1905	51
1906	39
1907	33
1908	37
1909	91
1910	59
1911	44
1912	42
1913	45
1914	46
1915	70
1916	39
1917	19
1918	35
1919	31
1920	21
1921	31
1922	25
1923	45
1924	35
1925	41
1926	71
1927	31
1928	17
1929	25
1930	42
1931	7
1932	26
1933	116
1934	233
1935	16
1952	1

Wettest Day of Each Month

Apr: 184.2 mm (7.3 in)

The wettest day on record for each calendar month at Waiawa 943. The most was 184.2 mm (7.3 in) on 22 April 1924.

Record daily precipitation for each month at Waiawa 943
Month	Record daily precipitation (mm)	Date
Jan	167.6 mm (6.6 in)	22 January 1990
Feb	127.0 mm (5.0 in)	14 February 1932
Mar	104.6 mm (4.1 in)	20 March 1917
Apr	184.2 mm (7.3 in)	22 April 1924
May	77.5 mm (3.1 in)	16 May 1927
Jun	91.4 mm (3.6 in)	3 June 1913
Jul	50.8 mm (2.0 in)	21 July 1907
Aug	77.7 mm (3.1 in)	30 August 1926
Sep	82.0 mm (3.2 in)	1 September 1908
Oct	144.3 mm (5.7 in)	14 October 1965
Nov	127.0 mm (5.0 in)	25 November 1918
Dec	149.9 mm (5.9 in)	24 December 1920

Period of Record Coverage

1905 to 1952

32 years of record at Waiawa 943, 1905 to 1952. 8 years have data for under 90 percent of days and are left out of rankings: 1907, 1920, 1921, 1923, 1927, 1928, 1935, 1952.

Days with data per year at Waiawa 943
Year	Days with data	Share of year	Complete
1905	365	100%	Yes
1906	361	99%	Yes
1907	314	86%	No
1908	356	97%	Yes
1909	330	90%	Yes
1910	359	98%	Yes
1911	365	100%	Yes
1912	366	100%	Yes
1913	364	100%	Yes
1914	364	100%	Yes
1915	364	100%	Yes
1916	366	100%	Yes
1917	364	100%	Yes
1918	334	92%	Yes
1919	365	100%	Yes
1920	274	75%	No
1921	323	88%	No
1922	365	100%	Yes
1923	314	86%	No
1924	366	100%	Yes
1925	354	97%	Yes
1926	358	98%	Yes
1927	296	81%	No
1928	148	40%	No
1929	331	91%	Yes
1930	365	100%	Yes
1931	365	100%	Yes
1932	330	90%	Yes
1933	363	99%	Yes
1934	360	99%	Yes
1935	31	8%	No
1952	1	0%	No

Latest Records

Latest records at Waiawa 943
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
28 June 2000	Waiawa 943, US	daily rain	22.9 mm (0.9 in)	7.4 mm (0.29 in)	84 years	20 of 100 (Routine)
22 October 1999	Waiawa 943, US	daily rain	53.8 mm (2.1 in)	37.3 mm (1.5 in)	93 years	65 of 100 (Major)
19 October 1999	Waiawa 943, US	daily rain	32.5 mm (1.3 in)	14.0 mm (0.6 in)	36 years	30 of 100 (Routine)
25 January 1996	Waiawa 943, US	daily rain	57.9 mm (2.3 in)	38.1 mm (1.5 in)	38 years	41 of 100 (Notable)
10 November 1995	Waiawa 943, US	daily rain	88.9 mm (3.5 in)	66.3 mm (2.6 in)	80 years	73 of 100 (Major)
17 November 1994	Waiawa 943, US	daily rain	25.9 mm (1.0 in)	9.4 mm (0.37 in)	37 years	26 of 100 (Routine)
16 February 1994	Waiawa 943, US	daily rain	51.1 mm (2.0 in)	13.0 mm (0.5 in)	67 years	37 of 100 (Notable)
4 October 1993	Waiawa 943, US	daily rain	89.9 mm (3.5 in)	55.4 mm (2.2 in)	19 years	53 of 100 (Notable)
26 December 1992	Waiawa 943, US	daily rain	118.1 mm (4.6 in)	73.1 mm (2.9 in)	83 years	68 of 100 (Major)
16 December 1991	Waiawa 943, US	daily rain	87.1 mm (3.4 in)	16.0 mm (0.6 in)	61 years	34 of 100 (Routine)
30 November 1991	Waiawa 943, US	daily rain	63.2 mm (2.5 in)	10.4 mm (0.4 in)	56 years	31 of 100 (Routine)
17 October 1991	Waiawa 943, US	daily rain	69.1 mm (2.7 in)	48.5 mm (1.9 in)	36 years	56 of 100 (Notable)
23 November 1990	Waiawa 943, US	daily rain	48.3 mm (1.9 in)	13.8 mm (0.5 in)	16 years	20 of 100 (Routine)
24 January 1990	Waiawa 943, US	daily rain	67.3 mm (2.6 in)	43.9 mm (1.7 in)	27 years	42 of 100 (Notable)
22 January 1990	Waiawa 943, US	monthly rain	167.6 mm (6.6 in)	49.5 mm (1.9 in)	74 years	70 of 100 (Major)
9 December 1989	Waiawa 943, US	daily rain	102.4 mm (4.0 in)	47.3 mm (1.9 in)	22 years	38 of 100 (Notable)
11 October 1989	Waiawa 943, US	daily rain	9.7 mm (0.38 in)	0.8 mm (0.03 in)	64 years	20 of 100 (Routine)
24 July 1989	Waiawa 943, US	daily rain	33.0 mm (1.3 in)	21.1 mm (0.8 in)	56 years	62 of 100 (Major)
23 July 1989	Waiawa 943, US	monthly rain (Tie)	50.8 mm (2.0 in)	tie	82 years	10 of 100 (Routine)
2 March 1989	Waiawa 943, US	daily rain	81.3 mm (3.2 in)	56.7 mm (2.2 in)	80 years	71 of 100 (Major)

Climate Trend

18 complete years, 1905 to 1931

One stripe for each of 18 complete years at Waiawa 943, 1905 to 1931. Blue stripes are years cooler than the station's own mean of 22.5 C (72.5 F); red stripes are warmer. The coolest year was 1910, at 22.0 C (71.7 F), and the warmest was 1930, at 23.0 C (73.4 F). The strongest colour marks a difference of 0.6 C (1.1 F).

Annual mean temperature at Waiawa 943 as warming stripes, 1905 to 1931
Year	Annual mean temperature	Difference from the station mean
1905	22.2 C	-0.28 C
1906	22.8 C	+0.28 C
1908	22.1 C	-0.45 C
1910	22.0 C	-0.47 C
1911	22.5 C	-0.03 C
1912	22.6 C	+0.08 C
1913	22.7 C	+0.19 C
1914	22.5 C	-0.01 C
1915	22.7 C	+0.16 C
1916	22.4 C	-0.16 C
1917	22.4 C	-0.15 C
1919	22.7 C	+0.14 C
1922	22.7 C	+0.21 C
1924	22.4 C	-0.07 C
1925	22.7 C	+0.14 C
1926	22.6 C	+0.06 C
1930	23.0 C	+0.51 C
1931	22.4 C	-0.08 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

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

1905 to 2000

Yearly extremes at Waiawa 943: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	37.2 C (99.0 F)	1952	31.7 C (89.1 F)	32
Coldest night (TNn)	9.4 C (48.9 F)	1909	12.2 C (54.0 F)	31
Wettest day (Rx1day)	184.2 mm (7.3 in)	1924	77.7 mm (3.1 in)	83
Wettest five days (Rx5day)	408.9 mm (16.1 in)	1982	124.0 mm (4.9 in)	83
Longest dry spell (CDD)	190 days	1953	39 days	83

Hottest day (TXx)

The hottest day of the year at Waiawa 943, 1905 to 2000. The record is 37.2 C (99.0 F) in 1952, marked on the chart; the median year is 31.7 C (89.1 F).

Hottest day (TXx) at Waiawa 943 by year
Year	Hottest day (TXx)
1905	31.1 C (88.0 F)
1906	31.1 C (88.0 F)
1907	31.1 C (88.0 F)
1908	30.6 C (87.1 F)
1909	31.7 C (89.1 F)
1910	31.1 C (88.0 F)
1911	32.2 C (90.0 F)
1912	34.4 C (93.9 F)
1913	32.8 C (91.0 F)
1914	32.8 C (91.0 F)
1915	32.2 C (90.0 F)
1916	31.1 C (88.0 F)
1917	31.1 C (88.0 F)
1918	31.7 C (89.1 F)
1919	31.7 C (89.1 F)
1920	31.7 C (89.1 F)
1921	30.0 C (86.0 F)
1922	33.3 C (91.9 F)
1923	32.2 C (90.0 F)
1924	31.1 C (88.0 F)
1925	32.2 C (90.0 F)
1926	31.7 C (89.1 F)
1927	32.8 C (91.0 F)
1928	31.1 C (88.0 F)
1929	31.7 C (89.1 F)
1930	31.7 C (89.1 F)
1931	30.6 C (87.1 F)
1932	31.7 C (89.1 F)
1933	33.9 C (93.0 F)
1934	36.7 C (98.1 F)
1935	31.7 C (89.1 F)
1949	n/a
1950	n/a
1951	n/a
1952	37.2 C (99.0 F)
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
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	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a

Coldest night (TNn)

The coldest night of the year at Waiawa 943, 1905 to 2000. The record is 9.4 C (48.9 F) in 1909, marked on the chart; the median year is 12.2 C (54.0 F).

Coldest night (TNn) at Waiawa 943 by year
Year	Coldest night (TNn)
1905	11.1 C (52.0 F)
1906	11.1 C (52.0 F)
1907	12.2 C (54.0 F)
1908	10.0 C (50.0 F)
1909	9.4 C (48.9 F)
1910	12.2 C (54.0 F)
1911	12.2 C (54.0 F)
1912	11.1 C (52.0 F)
1913	12.2 C (54.0 F)
1914	10.6 C (51.1 F)
1915	10.6 C (51.1 F)
1916	12.8 C (55.0 F)
1917	11.7 C (53.1 F)
1918	11.7 C (53.1 F)
1919	10.6 C (51.1 F)
1920	13.9 C (57.0 F)
1921	12.8 C (55.0 F)
1922	13.9 C (57.0 F)
1923	12.8 C (55.0 F)
1924	12.8 C (55.0 F)
1925	14.4 C (57.9 F)
1926	13.9 C (57.0 F)
1927	12.8 C (55.0 F)
1928	13.3 C (55.9 F)
1929	12.8 C (55.0 F)
1930	10.6 C (51.1 F)
1931	12.2 C (54.0 F)
1932	11.1 C (52.0 F)
1933	10.6 C (51.1 F)
1934	11.1 C (52.0 F)
1935	9.4 C (48.9 F)
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
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	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a

Wettest day (Rx1day)

The wettest day of the year at Waiawa 943, 1905 to 2000. The record is 184.2 mm (7.3 in) in 1924, marked on the chart; the median year is 77.7 mm (3.1 in).

Wettest day (Rx1day) at Waiawa 943 by year
Year	Wettest day (Rx1day)
1905	45.2 mm (1.8 in)
1906	74.7 mm (2.9 in)
1907	102.1 mm (4.0 in)
1908	82.0 mm (3.2 in)
1909	80.5 mm (3.2 in)
1910	71.1 mm (2.8 in)
1911	63.0 mm (2.5 in)
1912	86.4 mm (3.4 in)
1913	91.4 mm (3.6 in)
1914	89.4 mm (3.5 in)
1915	111.8 mm (4.4 in)
1916	120.7 mm (4.8 in)
1917	104.6 mm (4.1 in)
1918	127.0 mm (5.0 in)
1919	51.3 mm (2.0 in)
1920	149.9 mm (5.9 in)
1921	69.9 mm (2.8 in)
1922	48.0 mm (1.9 in)
1923	110.5 mm (4.4 in)
1924	184.2 mm (7.3 in)
1925	38.6 mm (1.5 in)
1926	77.7 mm (3.1 in)
1927	112.3 mm (4.4 in)
1928	46.2 mm (1.8 in)
1929	83.8 mm (3.3 in)
1930	123.7 mm (4.9 in)
1931	37.3 mm (1.5 in)
1932	127.0 mm (5.0 in)
1933	81.3 mm (3.2 in)
1934	73.7 mm (2.9 in)
1935	29.5 mm (1.2 in)
1949	35.6 mm (1.4 in)
1950	57.7 mm (2.3 in)
1951	84.3 mm (3.3 in)
1952	108.0 mm (4.3 in)
1953	31.8 mm (1.3 in)
1954	50.8 mm (2.0 in)
1955	98.8 mm (3.9 in)
1956	77.5 mm (3.1 in)
1957	94.2 mm (3.7 in)
1958	67.6 mm (2.7 in)
1959	43.7 mm (1.7 in)
1960	51.6 mm (2.0 in)
1961	54.4 mm (2.1 in)
1962	78.7 mm (3.1 in)
1963	66.5 mm (2.6 in)
1964	76.7 mm (3.0 in)
1965	144.3 mm (5.7 in)
1966	59.2 mm (2.3 in)
1967	55.1 mm (2.2 in)
1968	115.3 mm (4.5 in)
1969	62.0 mm (2.4 in)
1970	38.9 mm (1.5 in)
1971	94.0 mm (3.7 in)
1972	89.2 mm (3.5 in)
1973	120.7 mm (4.8 in)
1974	79.2 mm (3.1 in)
1975	96.0 mm (3.8 in)
1976	88.9 mm (3.5 in)
1977	43.2 mm (1.7 in)
1978	68.6 mm (2.7 in)
1979	119.4 mm (4.7 in)
1980	43.2 mm (1.7 in)
1981	73.7 mm (2.9 in)
1982	121.9 mm (4.8 in)
1983	30.5 mm (1.2 in)
1984	41.1 mm (1.6 in)
1985	44.7 mm (1.8 in)
1986	40.6 mm (1.6 in)
1987	104.6 mm (4.1 in)
1988	87.6 mm (3.4 in)
1989	102.4 mm (4.0 in)
1990	167.6 mm (6.6 in)
1991	87.1 mm (3.4 in)
1992	118.1 mm (4.6 in)
1993	89.9 mm (3.5 in)
1994	56.4 mm (2.2 in)
1995	88.9 mm (3.5 in)
1996	64.0 mm (2.5 in)
1997	26.7 mm (1.1 in)
1998	5.8 mm (0.23 in)
1999	53.8 mm (2.1 in)
2000	22.9 mm (0.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Waiawa 943, 1905 to 2000. The record is 408.9 mm (16.1 in) in 1982, marked on the chart; the median year is 124.0 mm (4.9 in).

Wettest five days (Rx5day) at Waiawa 943 by year
Year	Wettest five days (Rx5day)
1905	91.4 mm (3.6 in)
1906	130.6 mm (5.1 in)
1907	171.9 mm (6.8 in)
1908	233.8 mm (9.2 in)
1909	155.2 mm (6.1 in)
1910	108.2 mm (4.3 in)
1911	129.9 mm (5.1 in)
1912	130.1 mm (5.1 in)
1913	149.4 mm (5.9 in)
1914	153.9 mm (6.1 in)
1915	309.7 mm (12.2 in)
1916	275.7 mm (10.9 in)
1917	215.4 mm (8.5 in)
1918	188.5 mm (7.4 in)
1919	69.2 mm (2.7 in)
1920	317.5 mm (12.5 in)
1921	232.5 mm (9.2 in)
1922	103.0 mm (4.1 in)
1923	209.0 mm (8.2 in)
1924	196.1 mm (7.7 in)
1925	74.9 mm (2.9 in)
1926	62.2 mm (2.4 in)
1927	180.1 mm (7.1 in)
1928	61.7 mm (2.4 in)
1929	183.7 mm (7.2 in)
1930	180.1 mm (7.1 in)
1931	57.9 mm (2.3 in)
1932	190.5 mm (7.5 in)
1933	138.2 mm (5.4 in)
1934	81.8 mm (3.2 in)
1935	82.8 mm (3.3 in)
1949	71.4 mm (2.8 in)
1950	69.5 mm (2.7 in)
1951	87.4 mm (3.4 in)
1952	117.1 mm (4.6 in)
1953	41.5 mm (1.6 in)
1954	93.8 mm (3.7 in)
1955	196.8 mm (7.7 in)
1956	110.3 mm (4.3 in)
1957	166.0 mm (6.5 in)
1958	74.7 mm (2.9 in)
1959	72.2 mm (2.8 in)
1960	113.1 mm (4.5 in)
1961	128.4 mm (5.1 in)
1962	141.4 mm (5.6 in)
1963	104.4 mm (4.1 in)
1964	115.1 mm (4.5 in)
1965	193.8 mm (7.6 in)
1966	125.2 mm (4.9 in)
1967	85.6 mm (3.4 in)
1968	136.1 mm (5.4 in)
1969	99.3 mm (3.9 in)
1970	65.3 mm (2.6 in)
1971	126.8 mm (5.0 in)
1972	137.0 mm (5.4 in)
1973	202.0 mm (8.0 in)
1974	79.8 mm (3.1 in)
1975	180.3 mm (7.1 in)
1976	126.1 mm (5.0 in)
1977	92.7 mm (3.6 in)
1978	159.2 mm (6.3 in)
1979	123.7 mm (4.9 in)
1980	106.5 mm (4.2 in)
1981	210.9 mm (8.3 in)
1982	408.9 mm (16.1 in)
1983	56.1 mm (2.2 in)
1984	78.0 mm (3.1 in)
1985	66.0 mm (2.6 in)
1986	57.1 mm (2.2 in)
1987	325.6 mm (12.8 in)
1988	170.2 mm (6.7 in)
1989	136.2 mm (5.4 in)
1990	285.2 mm (11.2 in)
1991	124.0 mm (4.9 in)
1992	132.8 mm (5.2 in)
1993	92.4 mm (3.6 in)
1994	56.4 mm (2.2 in)
1995	101.1 mm (4.0 in)
1996	85.6 mm (3.4 in)
1997	38.4 mm (1.5 in)
1998	4.4 mm (0.17 in)
1999	106.4 mm (4.2 in)
2000	22.9 mm (0.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Waiawa 943, 1905 to 2000. The record is 190 days in 1953, marked on the chart; the median year is 39 days.

Longest dry spell (CDD) at Waiawa 943 by year
Year	Longest dry spell (CDD)
1905	24 days
1906	17 days
1907	19 days
1908	13 days
1909	21 days
1910	12 days
1911	12 days
1912	12 days
1913	13 days
1914	13 days
1915	12 days
1916	9 days
1917	9 days
1918	16 days
1919	16 days
1920	23 days
1921	14 days
1922	23 days
1923	13 days
1924	6 days
1925	7 days
1926	11 days
1927	5 days
1928	17 days
1929	2 days
1930	8 days
1931	8 days
1932	10 days
1933	20 days
1934	15 days
1935	3 days
1949	38 days
1950	69 days
1951	37 days
1952	47 days
1953	190 days
1954	41 days
1955	46 days
1956	67 days
1957	65 days
1958	97 days
1959	54 days
1960	39 days
1961	28 days
1962	55 days
1963	78 days
1964	56 days
1965	46 days
1966	75 days
1967	37 days
1968	26 days
1969	67 days
1970	82 days
1971	42 days
1972	22 days
1973	78 days
1974	35 days
1975	65 days
1976	43 days
1977	46 days
1978	57 days
1979	60 days
1980	52 days
1981	47 days
1982	44 days
1983	57 days
1984	40 days
1985	42 days
1986	31 days
1987	40 days
1988	62 days
1989	52 days
1990	74 days
1991	44 days
1992	34 days
1993	83 days
1994	45 days
1995	51 days
1996	54 days
1997	30 days
1998	42 days
1999	86 days
2000	56 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

62 years, 1905 to 1995

A day with at least 77.3 mm (3.0 in) of rain is expected about once in 2 years. A day with at least 155.4 mm (6.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Waiawa 943: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	77.3 mm (3.0 in)
5 years	103.5 mm (4.1 in)
10 years	118.4 mm (4.7 in)
25 years	135.0 mm (5.3 in)
50 years	145.8 mm (5.7 in)
100 years	155.4 mm (6.1 in)	Longer than the 62 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, 62 years of values from 1905 to 1995.

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: 167.6 mm (6.6 in) in 1990; 144.3 mm (5.7 in) in 1965; 127.0 mm (5.0 in) in 1918.

Download the Data

Data for Waiawa 943 standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Waiawa 943 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 2026-10-13 (13 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).