Pahala 21 Weather Records (USC00517421)

Record envelope, standing records and threshold days for Pahala 21 (USC00517421), Hawaii, United States, with 122 years of record.

Key Facts for Pahala 21

Pahala 21 (USC00517421) is a weather station in Hawaii, United States at 19.20 latitude and -155.48 longitude, 256 m (840 ft) above sea level.
The station reports from 1905 to 2026, 122 years of record.
1,464 records set at Pahala 21 still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Pahala 21 set a daily record precipitation of 180.8 mm (7.1 in) on 23 March 2026.

About the Station

Location: Hawaii, United States, 19.20 latitude, -155.48 longitude.
Elevation: 256 m (840 ft).
Period of record: 1905 to 2026, 122 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 Pahala 21. 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 Pahala 21, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	33.9 C (93.0 F)	10.0 C (50.0 F)	n/a	n/a
Feb	34.4 C (93.9 F)	10.6 C (51.1 F)	n/a	n/a
Mar	32.2 C (90.0 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	32.8 C (91.0 F)	12.2 C (54.0 F)	n/a	n/a
Jun	35.6 C (96.1 F)	12.2 C (54.0 F)	n/a	n/a
Jul	35.0 C (95.0 F)	11.1 C (52.0 F)	n/a	n/a
Aug	35.6 C (96.1 F)	11.1 C (52.0 F)	n/a	n/a
Sep	33.9 C (93.0 F)	13.3 C (55.9 F)	n/a	n/a
Oct	32.8 C (91.0 F)	13.3 C (55.9 F)	n/a	n/a
Nov	33.3 C (91.9 F)	11.1 C (52.0 F)	n/a	n/a
Dec	32.8 C (91.0 F)	8.9 C (48.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Pahala 21 still stand. 1920 holds the most, with 121.

Standing records at Pahala 21 by the year they were set
Year set	Standing records
1905	47
1906	26
1907	13
1908	40
1909	35
1910	42
1911	27
1912	67
1913	15
1914	16
1915	30
1916	17
1917	24
1918	10
1919	10
1920	121
1921	14
1922	33
1923	19
1924	6
1925	59
1926	45
1927	28
1928	15
1929	12
1930	39
1931	20
1932	16
1933	23
1934	10
1935	14
1936	13
1937	9
1938	19
1939	14
1940	17
1941	19
1942	10
1943	18
1944	25
1945	13
1946	9
1947	11
1948	13
1949	16
1950	22
1951	19
1952	17
1953	4
1954	16
1955	25
1956	12
1957	19
1958	19
1959	22
1960	17
1961	14
1962	15
1963	18
1964	8
1965	19
1966	9
1967	7
1968	17
1969	13
1970	9
1971	10
1972	9
1973	1
1974	8
1975	5
1976	3
1977	7
1978	1

All-Time Record Progression

3 new records

3 all-time records were set at Pahala 21 between 25 December 1956 and 20 February 1979. Each dot is a new record.

When Pahala 21 set new all-time records
Date	Kind	Detail
1956-12-25	Record low minimum temperature	Record low minimum temperature 8.9 C (48.0 F)
1963-02-01	Record high minimum temperature	Record high minimum temperature 22.8 C (73.0 F)
1979-02-20	Record daily precipitation	Record daily precipitation 430.8 mm (17.0 in)

Wettest Day of Each Month

Feb: 430.8 mm (17.0 in)

The wettest day on record for each calendar month at Pahala 21. The most was 430.8 mm (17.0 in) on 20 February 1979.

Record daily precipitation for each month at Pahala 21
Month	Record daily precipitation (mm)	Date
Jan	241.3 mm (9.5 in)	31 January 1946
Feb	430.8 mm (17.0 in)	20 February 1979
Mar	381.0 mm (15.0 in)	18 March 1980
Apr	267.2 mm (10.5 in)	8 April 1945
May	180.3 mm (7.1 in)	15 May 1917
Jun	60.2 mm (2.4 in)	17 June 1982
Jul	140.2 mm (5.5 in)	22 July 1982
Aug	288.8 mm (11.4 in)	8 August 1958
Sep	137.4 mm (5.4 in)	7 September 1941
Oct	187.2 mm (7.4 in)	26 October 1951
Nov	407.9 mm (16.1 in)	11 November 1915
Dec	302.3 mm (11.9 in)	26 December 1981

Period of Record Coverage

1905 to 1978

74 years of record at Pahala 21, 1905 to 1978. 19 years have data for under 90 percent of days and are left out of rankings: 1911, 1912, 1914, 1932, 1933, 1934, 1935, 1936 and others.

Days with data per year at Pahala 21
Year	Days with data	Share of year	Complete
1905	365	100%	Yes
1906	353	97%	Yes
1907	364	100%	Yes
1908	363	99%	Yes
1909	365	100%	Yes
1910	365	100%	Yes
1911	314	86%	No
1912	328	90%	No
1913	333	91%	Yes
1914	279	76%	No
1915	363	99%	Yes
1916	366	100%	Yes
1917	365	100%	Yes
1918	364	100%	Yes
1919	365	100%	Yes
1920	365	100%	Yes
1921	365	100%	Yes
1922	364	100%	Yes
1923	365	100%	Yes
1924	345	94%	Yes
1925	365	100%	Yes
1926	365	100%	Yes
1927	365	100%	Yes
1928	366	100%	Yes
1929	365	100%	Yes
1930	365	100%	Yes
1931	345	95%	Yes
1932	309	84%	No
1933	309	85%	No
1934	309	85%	No
1935	307	84%	No
1936	302	83%	No
1937	315	86%	No
1938	302	83%	No
1939	344	94%	Yes
1940	362	99%	Yes
1941	363	99%	Yes
1942	353	97%	Yes
1943	359	98%	Yes
1944	359	98%	Yes
1945	360	99%	Yes
1946	364	100%	Yes
1947	364	100%	Yes
1948	366	100%	Yes
1949	364	100%	Yes
1950	363	99%	Yes
1951	330	90%	Yes
1952	363	99%	Yes
1953	362	99%	Yes
1954	362	99%	Yes
1955	353	97%	Yes
1956	357	98%	Yes
1957	363	99%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	366	100%	Yes
1961	350	96%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	347	95%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	306	84%	No
1971	253	69%	No
1972	234	64%	No
1973	267	73%	No
1974	316	87%	No
1975	281	77%	No
1976	252	69%	No
1977	254	70%	No
1978	81	22%	No

Latest Records

Latest records at Pahala 21
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
23 March 2026	Pahala 21, US	daily rain	180.8 mm (7.1 in)	109.2 mm (4.3 in)	75 years	72 of 100 (Major)
24 September 2025	Pahala 21, US	daily rain	131.3 mm (5.2 in)	47.7 mm (1.9 in)	59 years	63 of 100 (Major)
18 September 1984	Pahala 21, US	daily rain	21.6 mm (0.9 in)	5.1 mm (0.20 in)	7 years	13 of 100 (Routine)
24 January 1984	Pahala 21, US	daily rain	35.6 mm (1.4 in)	1.8 mm (0.07 in)	33 years	18 of 100 (Routine)
4 September 1983	Pahala 21, US	daily rain	9.9 mm (0.39 in)	1.0 mm (0.04 in)	46 years	20 of 100 (Routine)
28 May 1983	Pahala 21, US	daily rain	14.2 mm (0.6 in)	1.2 mm (0.05 in)	48 years	20 of 100 (Routine)
24 July 1982	Pahala 21, US	daily rain	16.5 mm (0.6 in)	5.1 mm (0.20 in)	47 years	20 of 100 (Routine)
22 July 1982	Pahala 21, US	monthly rain	140.2 mm (5.5 in)	52.1 mm (2.1 in)	44 years	70 of 100 (Major)
21 June 1982	Pahala 21, US	daily rain	51.3 mm (2.0 in)	39.9 mm (1.6 in)	61 years	65 of 100 (Major)
17 June 1982	Pahala 21, US	monthly rain	60.2 mm (2.4 in)	0.5 mm (0.02 in)	0 years	17 of 100 (Routine)
9 June 1982	Pahala 21, US	monthly rain	59.7 mm (2.4 in)	2.5 mm (0.10 in)	53 years	36 of 100 (Notable)
8 June 1982	Pahala 21, US	daily rain	35.8 mm (1.4 in)	11.2 mm (0.4 in)	37 years	34 of 100 (Routine)
7 June 1982	Pahala 21, US	daily rain	16.5 mm (0.6 in)	1.8 mm (0.07 in)	56 years	20 of 100 (Routine)
27 May 1982	Pahala 21, US	daily rain	11.4 mm (0.4 in)	0.2 mm (0.01 in)	75 years	20 of 100 (Routine)
22 January 1982	Pahala 21, US	daily rain	226.1 mm (8.9 in)	61.0 mm (2.4 in)	31 years	36 of 100 (Notable)
26 December 1981	Pahala 21, US	monthly rain	302.3 mm (11.9 in)	68.6 mm (2.7 in)	65 years	64 of 100 (Major)
25 December 1981	Pahala 21, US	daily rain	118.1 mm (4.6 in)	3.8 mm (0.15 in)	54 years	24 of 100 (Routine)
28 September 1981	Pahala 21, US	daily rain	28.2 mm (1.1 in)	4.3 mm (0.17 in)	20 years	16 of 100 (Routine)
5 August 1981	Pahala 21, US	daily rain	132.1 mm (5.2 in)	92.7 mm (3.6 in)	24 years	53 of 100 (Notable)
3 July 1981	Pahala 21, US	daily rain	13.5 mm (0.5 in)	4.6 mm (0.18 in)	47 years	20 of 100 (Routine)

Climate Trend

59 complete years, 1905 to 1976

One stripe for each of 59 complete years at Pahala 21, 1905 to 1976. Blue stripes are years cooler than the station's own mean of 21.8 C (71.2 F); red stripes are warmer. The coolest year was 1920, at 20.6 C (69.0 F), and the warmest was 1926, at 23.0 C (73.3 F). The strongest colour marks a difference of 1.3 C (2.3 F).

Annual mean temperature at Pahala 21 as warming stripes, 1905 to 1976
Year	Annual mean temperature	Difference from the station mean
1905	22.2 C	+0.45 C
1907	21.9 C	+0.07 C
1908	21.5 C	-0.29 C
1909	21.3 C	-0.45 C
1910	21.3 C	-0.52 C
1912	22.4 C	+0.62 C
1915	21.4 C	-0.43 C
1916	21.8 C	+0.04 C
1917	20.9 C	-0.90 C
1918	21.5 C	-0.32 C
1919	21.2 C	-0.57 C
1920	20.6 C	-1.21 C
1921	21.5 C	-0.31 C
1922	21.5 C	-0.31 C
1923	21.9 C	+0.14 C
1926	23.0 C	+1.17 C
1927	22.7 C	+0.89 C
1928	22.2 C	+0.44 C
1929	22.1 C	+0.28 C
1930	22.5 C	+0.70 C
1931	21.6 C	-0.14 C
1932	21.6 C	-0.22 C
1933	20.8 C	-0.98 C
1934	22.1 C	+0.30 C
1935	21.9 C	+0.07 C
1936	22.1 C	+0.35 C
1937	21.9 C	+0.11 C
1939	21.5 C	-0.26 C
1940	22.4 C	+0.59 C
1941	22.2 C	+0.42 C
1942	22.4 C	+0.59 C
1943	21.9 C	+0.08 C
1944	21.8 C	+0.02 C
1945	21.9 C	+0.08 C
1946	21.9 C	+0.15 C
1947	21.6 C	-0.15 C
1948	21.8 C	-0.02 C
1949	21.2 C	-0.63 C
1950	22.0 C	+0.17 C
1952	21.6 C	-0.17 C
1953	21.8 C	-0.02 C
1954	22.1 C	+0.31 C
1955	21.0 C	-0.77 C
1956	21.6 C	-0.22 C
1957	21.8 C	+0.00 C
1958	21.9 C	+0.13 C
1959	22.4 C	+0.60 C
1960	22.1 C	+0.28 C
1961	22.2 C	+0.46 C
1962	21.4 C	-0.43 C
1963	22.1 C	+0.28 C
1965	21.3 C	-0.46 C
1966	21.7 C	-0.13 C
1967	21.9 C	+0.07 C
1968	22.4 C	+0.60 C
1969	21.7 C	-0.07 C
1971	21.4 C	-0.34 C
1974	21.8 C	+0.00 C
1976	21.4 C	-0.35 C

The fitted trend in annual mean temperature here over 1905 to 1976 is 0.02 C (-0.04 to 0.08) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.03 F (-0.08 to 0.14) per decade. The slope is a straight line fitted to 59 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Pahala 21
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.02 C (-0.04 to 0.08) per decade	0.03 F (-0.08 to 0.14) per decade	1905 to 1976	59	Not clearly different from zero
Mean daily maximum	-0.1 C (-0.2 to -0.1) per decade	-0.2 F (-0.4 to -0.1) per decade	1905 to 1976	59	Fall
Mean daily minimum	0.2 C (0.1 to 0.2) per decade	0.3 F (0.2 to 0.4) per decade	1905 to 1976	59	Rise

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 2026

Yearly extremes at Pahala 21: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	35.6 C (96.1 F)	1905	31.7 C (89.1 F)	74
Coldest night (TNn)	8.9 C (48.0 F)	1956	12.2 C (54.0 F)	74
Wettest day (Rx1day)	430.8 mm (17.0 in)	1979	130.8 mm (5.1 in)	84
Wettest five days (Rx5day)	780.8 mm (30.7 in)	1946	219.0 mm (8.6 in)	83
Longest dry spell (CDD)	92 days	1908	27 days	84

Hottest day (TXx)

The hottest day of the year at Pahala 21, 1905 to 2026. The record is 35.6 C (96.1 F) in 1905, marked on the chart; the median year is 31.7 C (89.1 F).

Hottest day (TXx) at Pahala 21 by year
Year	Hottest day (TXx)
1905	35.6 C (96.1 F)
1906	35.0 C (95.0 F)
1907	32.2 C (90.0 F)
1908	32.8 C (91.0 F)
1909	30.6 C (87.1 F)
1910	31.1 C (88.0 F)
1911	32.8 C (91.0 F)
1912	33.9 C (93.0 F)
1913	32.8 C (91.0 F)
1914	31.1 C (88.0 F)
1915	30.6 C (87.1 F)
1916	31.1 C (88.0 F)
1917	30.0 C (86.0 F)
1918	32.2 C (90.0 F)
1919	30.6 C (87.1 F)
1920	31.7 C (89.1 F)
1921	32.8 C (91.0 F)
1922	30.6 C (87.1 F)
1923	33.3 C (91.9 F)
1924	30.0 C (86.0 F)
1925	35.6 C (96.1 F)
1926	33.3 C (91.9 F)
1927	34.4 C (93.9 F)
1928	33.3 C (91.9 F)
1929	31.7 C (89.1 F)
1930	31.7 C (89.1 F)
1931	31.7 C (89.1 F)
1932	33.9 C (93.0 F)
1933	32.2 C (90.0 F)
1934	31.7 C (89.1 F)
1935	33.3 C (91.9 F)
1936	32.2 C (90.0 F)
1937	30.6 C (87.1 F)
1938	31.7 C (89.1 F)
1939	31.7 C (89.1 F)
1940	32.2 C (90.0 F)
1941	32.2 C (90.0 F)
1942	31.7 C (89.1 F)
1943	32.2 C (90.0 F)
1944	31.7 C (89.1 F)
1945	31.7 C (89.1 F)
1946	30.6 C (87.1 F)
1947	30.6 C (87.1 F)
1948	30.6 C (87.1 F)
1949	30.0 C (86.0 F)
1950	31.7 C (89.1 F)
1951	31.7 C (89.1 F)
1952	31.7 C (89.1 F)
1953	31.7 C (89.1 F)
1954	32.8 C (91.0 F)
1955	31.1 C (88.0 F)
1956	31.1 C (88.0 F)
1957	33.3 C (91.9 F)
1958	32.8 C (91.0 F)
1959	33.3 C (91.9 F)
1960	33.3 C (91.9 F)
1961	33.3 C (91.9 F)
1962	30.6 C (87.1 F)
1963	33.9 C (93.0 F)
1964	31.7 C (89.1 F)
1965	30.0 C (86.0 F)
1966	30.6 C (87.1 F)
1967	31.1 C (88.0 F)
1968	30.6 C (87.1 F)
1969	31.1 C (88.0 F)
1970	32.8 C (91.0 F)
1971	30.6 C (87.1 F)
1972	31.7 C (89.1 F)
1973	31.1 C (88.0 F)
1974	31.7 C (89.1 F)
1975	30.6 C (87.1 F)
1976	31.1 C (88.0 F)
1977	32.8 C (91.0 F)
1978	29.4 C (84.9 F)
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
2024	n/a
2025	n/a
2026	n/a

Coldest night (TNn)

The coldest night of the year at Pahala 21, 1905 to 2026. The record is 8.9 C (48.0 F) in 1956, marked on the chart; the median year is 12.2 C (54.0 F).

Coldest night (TNn) at Pahala 21 by year
Year	Coldest night (TNn)
1905	11.1 C (52.0 F)
1906	10.6 C (51.1 F)
1907	11.7 C (53.1 F)
1908	11.1 C (52.0 F)
1909	10.0 C (50.0 F)
1910	10.6 C (51.1 F)
1911	11.7 C (53.1 F)
1912	10.6 C (51.1 F)
1913	12.2 C (54.0 F)
1914	11.7 C (53.1 F)
1915	10.0 C (50.0 F)
1916	12.8 C (55.0 F)
1917	11.1 C (52.0 F)
1918	11.7 C (53.1 F)
1919	10.0 C (50.0 F)
1920	12.2 C (54.0 F)
1921	12.8 C (55.0 F)
1922	11.1 C (52.0 F)
1923	11.1 C (52.0 F)
1924	12.2 C (54.0 F)
1925	13.3 C (55.9 F)
1926	13.3 C (55.9 F)
1927	12.2 C (54.0 F)
1928	11.7 C (53.1 F)
1929	12.2 C (54.0 F)
1930	11.1 C (52.0 F)
1931	11.7 C (53.1 F)
1932	13.3 C (55.9 F)
1933	12.2 C (54.0 F)
1934	12.8 C (55.0 F)
1935	11.1 C (52.0 F)
1936	11.1 C (52.0 F)
1937	12.2 C (54.0 F)
1938	12.2 C (54.0 F)
1939	12.2 C (54.0 F)
1940	12.8 C (55.0 F)
1941	12.2 C (54.0 F)
1942	12.2 C (54.0 F)
1943	11.7 C (53.1 F)
1944	13.3 C (55.9 F)
1945	12.2 C (54.0 F)
1946	12.8 C (55.0 F)
1947	12.8 C (55.0 F)
1948	12.2 C (54.0 F)
1949	10.6 C (51.1 F)
1950	12.2 C (54.0 F)
1951	13.3 C (55.9 F)
1952	12.2 C (54.0 F)
1953	12.2 C (54.0 F)
1954	12.8 C (55.0 F)
1955	11.7 C (53.1 F)
1956	8.9 C (48.0 F)
1957	11.7 C (53.1 F)
1958	11.1 C (52.0 F)
1959	12.2 C (54.0 F)
1960	12.8 C (55.0 F)
1961	12.2 C (54.0 F)
1962	11.7 C (53.1 F)
1963	13.9 C (57.0 F)
1964	12.8 C (55.0 F)
1965	12.8 C (55.0 F)
1966	11.1 C (52.0 F)
1967	11.7 C (53.1 F)
1968	13.3 C (55.9 F)
1969	12.2 C (54.0 F)
1970	10.0 C (50.0 F)
1971	12.8 C (55.0 F)
1972	12.2 C (54.0 F)
1973	12.8 C (55.0 F)
1974	13.3 C (55.9 F)
1975	11.7 C (53.1 F)
1976	13.9 C (57.0 F)
1977	13.3 C (55.9 F)
1978	11.7 C (53.1 F)
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
2024	n/a
2025	n/a
2026	n/a

Wettest day (Rx1day)

The wettest day of the year at Pahala 21, 1905 to 2026. The record is 430.8 mm (17.0 in) in 1979, marked on the chart; the median year is 130.8 mm (5.1 in).

Wettest day (Rx1day) at Pahala 21 by year
Year	Wettest day (Rx1day)
1905	126.2 mm (5.0 in)
1906	161.3 mm (6.4 in)
1907	152.4 mm (6.0 in)
1908	99.1 mm (3.9 in)
1909	125.7 mm (4.9 in)
1910	121.2 mm (4.8 in)
1911	193.0 mm (7.6 in)
1912	48.3 mm (1.9 in)
1913	100.3 mm (3.9 in)
1914	83.8 mm (3.3 in)
1915	407.9 mm (16.1 in)
1916	233.7 mm (9.2 in)
1917	180.3 mm (7.1 in)
1918	252.7 mm (9.9 in)
1919	106.7 mm (4.2 in)
1920	112.8 mm (4.4 in)
1921	115.3 mm (4.5 in)
1922	65.5 mm (2.6 in)
1923	242.8 mm (9.6 in)
1924	128.3 mm (5.1 in)
1925	57.2 mm (2.3 in)
1926	105.7 mm (4.2 in)
1927	129.0 mm (5.1 in)
1928	57.2 mm (2.3 in)
1929	190.5 mm (7.5 in)
1930	74.9 mm (2.9 in)
1931	71.4 mm (2.8 in)
1932	111.0 mm (4.4 in)
1933	123.4 mm (4.9 in)
1934	82.8 mm (3.3 in)
1935	111.3 mm (4.4 in)
1936	76.7 mm (3.0 in)
1937	162.1 mm (6.4 in)
1938	160.0 mm (6.3 in)
1939	175.3 mm (6.9 in)
1940	94.0 mm (3.7 in)
1941	137.4 mm (5.4 in)
1942	48.8 mm (1.9 in)
1943	188.5 mm (7.4 in)
1944	157.5 mm (6.2 in)
1945	267.2 mm (10.5 in)
1946	318.5 mm (12.5 in)
1947	73.7 mm (2.9 in)
1948	151.4 mm (6.0 in)
1949	188.7 mm (7.4 in)
1950	122.4 mm (4.8 in)
1951	187.2 mm (7.4 in)
1952	94.7 mm (3.7 in)
1953	102.4 mm (4.0 in)
1954	175.3 mm (6.9 in)
1955	189.5 mm (7.5 in)
1956	301.8 mm (11.9 in)
1957	114.8 mm (4.5 in)
1958	288.8 mm (11.4 in)
1959	168.4 mm (6.6 in)
1960	68.6 mm (2.7 in)
1961	152.4 mm (6.0 in)
1962	159.0 mm (6.3 in)
1963	144.5 mm (5.7 in)
1964	61.0 mm (2.4 in)
1965	128.3 mm (5.1 in)
1966	120.9 mm (4.8 in)
1967	212.1 mm (8.4 in)
1968	198.1 mm (7.8 in)
1969	159.5 mm (6.3 in)
1970	145.3 mm (5.7 in)
1971	131.6 mm (5.2 in)
1972	130.3 mm (5.1 in)
1973	152.4 mm (6.0 in)
1974	107.4 mm (4.2 in)
1975	193.0 mm (7.6 in)
1976	213.4 mm (8.4 in)
1977	51.3 mm (2.0 in)
1978	104.4 mm (4.1 in)
1979	430.8 mm (17.0 in)
1980	381.0 mm (15.0 in)
1981	302.3 mm (11.9 in)
1982	226.1 mm (8.9 in)
1983	90.9 mm (3.6 in)
1984	64.5 mm (2.5 in)
1985	38.9 mm (1.5 in)
2024	1.8 mm (0.07 in)
2025	131.3 mm (5.2 in)
2026	180.8 mm (7.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Pahala 21, 1905 to 2026. The record is 780.8 mm (30.7 in) in 1946, marked on the chart; the median year is 219.0 mm (8.6 in).

Wettest five days (Rx5day) at Pahala 21 by year
Year	Wettest five days (Rx5day)
1905	207.4 mm (8.2 in)
1906	307.4 mm (12.1 in)
1907	207.8 mm (8.2 in)
1908	119.7 mm (4.7 in)
1909	215.9 mm (8.5 in)
1910	135.2 mm (5.3 in)
1911	242.0 mm (9.5 in)
1912	85.8 mm (3.4 in)
1913	65.6 mm (2.6 in)
1914	141.9 mm (5.6 in)
1915	283.1 mm (11.1 in)
1916	313.7 mm (12.4 in)
1917	242.9 mm (9.6 in)
1918	529.8 mm (20.9 in)
1919	113.0 mm (4.4 in)
1920	267.8 mm (10.5 in)
1921	212.3 mm (8.4 in)
1922	139.8 mm (5.5 in)
1923	359.5 mm (14.2 in)
1924	189.4 mm (7.5 in)
1925	86.9 mm (3.4 in)
1926	169.2 mm (6.7 in)
1927	440.6 mm (17.3 in)
1928	61.0 mm (2.4 in)
1929	263.4 mm (10.4 in)
1930	176.5 mm (6.9 in)
1931	79.4 mm (3.1 in)
1932	212.4 mm (8.4 in)
1933	140.5 mm (5.5 in)
1934	97.3 mm (3.8 in)
1935	178.6 mm (7.0 in)
1936	101.6 mm (4.0 in)
1937	245.7 mm (9.7 in)
1938	308.1 mm (12.1 in)
1939	354.0 mm (13.9 in)
1940	139.5 mm (5.5 in)
1941	187.3 mm (7.4 in)
1942	97.0 mm (3.8 in)
1943	362.1 mm (14.3 in)
1944	279.7 mm (11.0 in)
1945	406.1 mm (16.0 in)
1946	780.8 mm (30.7 in)
1947	99.4 mm (3.9 in)
1948	156.0 mm (6.1 in)
1949	360.4 mm (14.2 in)
1950	249.2 mm (9.8 in)
1951	372.9 mm (14.7 in)
1952	296.8 mm (11.7 in)
1953	204.7 mm (8.1 in)
1954	308.5 mm (12.1 in)
1955	271.5 mm (10.7 in)
1956	450.7 mm (17.7 in)
1957	199.6 mm (7.9 in)
1958	304.5 mm (12.0 in)
1959	296.2 mm (11.7 in)
1960	84.1 mm (3.3 in)
1961	225.5 mm (8.9 in)
1962	238.5 mm (9.4 in)
1963	498.4 mm (19.6 in)
1964	151.7 mm (6.0 in)
1965	262.1 mm (10.3 in)
1966	264.2 mm (10.4 in)
1967	328.2 mm (12.9 in)
1968	351.8 mm (13.9 in)
1969	349.5 mm (13.8 in)
1970	136.4 mm (5.4 in)
1971	219.0 mm (8.6 in)
1972	105.9 mm (4.2 in)
1973	318.3 mm (12.5 in)
1974	160.6 mm (6.3 in)
1975	396.3 mm (15.6 in)
1976	296.7 mm (11.7 in)
1977	75.0 mm (3.0 in)
1978	138.7 mm (5.5 in)
1979	344.4 mm (13.6 in)
1980	628.7 mm (24.8 in)
1981	458.2 mm (18.0 in)
1982	329.0 mm (13.0 in)
1983	117.6 mm (4.6 in)
1984	109.9 mm (4.3 in)
1985	46.9 mm (1.8 in)
2024	n/a
2025	146.8 mm (5.8 in)
2026	197.6 mm (7.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Pahala 21, 1905 to 2026. The record is 92 days in 1908, marked on the chart; the median year is 27 days.

Longest dry spell (CDD) at Pahala 21 by year
Year	Longest dry spell (CDD)
1905	33 days
1906	34 days
1907	26 days
1908	92 days
1909	41 days
1910	35 days
1911	41 days
1912	24 days
1913	21 days
1914	16 days
1915	24 days
1916	65 days
1917	31 days
1918	26 days
1919	50 days
1920	20 days
1921	32 days
1922	29 days
1923	54 days
1924	22 days
1925	28 days
1926	25 days
1927	28 days
1928	35 days
1929	21 days
1930	19 days
1931	52 days
1932	27 days
1933	60 days
1934	26 days
1935	30 days
1936	26 days
1937	17 days
1938	22 days
1939	23 days
1940	18 days
1941	28 days
1942	25 days
1943	25 days
1944	31 days
1945	28 days
1946	26 days
1947	16 days
1948	21 days
1949	45 days
1950	22 days
1951	21 days
1952	43 days
1953	37 days
1954	42 days
1955	28 days
1956	36 days
1957	16 days
1958	27 days
1959	23 days
1960	23 days
1961	35 days
1962	28 days
1963	29 days
1964	26 days
1965	16 days
1966	34 days
1967	15 days
1968	18 days
1969	23 days
1970	26 days
1971	35 days
1972	20 days
1973	67 days
1974	17 days
1975	17 days
1976	31 days
1977	32 days
1978	37 days
1979	30 days
1980	27 days
1981	24 days
1982	24 days
1983	35 days
1984	34 days
1985	15 days
2024	2 days
2025	15 days
2026	18 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

71 years, 1905 to 1984

A day with at least 135.8 mm (5.3 in) of rain is expected about once in 2 years. A day with at least 422.6 mm (16.6 in) of rain is expected about once in 100 years.

Rainfall return levels at Pahala 21: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	135.8 mm (5.3 in)
5 years	202.7 mm (8.0 in)
10 years	250.7 mm (9.9 in)
25 years	316.0 mm (12.4 in)
50 years	367.9 mm (14.5 in)
100 years	422.6 mm (16.6 in)	Longer than the 71 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, 71 years of values from 1905 to 1984.

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: 407.9 mm (16.1 in) in 1915; 381.0 mm (15.0 in) in 1980; 318.5 mm (12.5 in) in 1946.

Download the Data

Data for Pahala 21 standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Pahala 21 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 2026-10-12. Last revised 12 October 2026 (2026-10-12).