Honomu Mauka 138 Weather Records (USC00511960)

Record envelope, standing records and threshold days for Honomu Mauka 138 (USC00511960), Hawaii, United States, with 68 years of record.

Key Facts for Honomu Mauka 138

Honomu Mauka 138 (USC00511960) is a weather station in Hawaii, United States at 19.85 latitude and -155.15 longitude, 335 m (1,100 ft) above sea level.
The station reports from 1911 to 1978, 68 years of record.
1,464 records set at Honomu Mauka 138 still stand.
Records are tracked for prcp, snow: an element needs 30 years of data to be eligible.
Honomu Mauka 138 set a daily record precipitation of 119.4 mm (4.7 in) on 12 August 1977.

About the Station

Location: Hawaii, United States, 19.85 latitude, -155.15 longitude.
Elevation: 335 m (1,100 ft).
Period of record: 1911 to 1978, 68 years.
Eligible elements: prcp, snow.

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 Honomu Mauka 138. 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 Honomu Mauka 138, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	28.9 C (84.0 F)	11.7 C (53.1 F)	n/a	n/a
Feb	31.1 C (88.0 F)	10.0 C (50.0 F)	n/a	n/a
Mar	28.3 C (82.9 F)	9.4 C (48.9 F)	n/a	n/a
Apr	28.9 C (84.0 F)	13.3 C (55.9 F)	n/a	n/a
May	30.0 C (86.0 F)	13.9 C (57.0 F)	n/a	n/a
Jun	30.0 C (86.0 F)	13.3 C (55.9 F)	n/a	n/a
Jul	30.0 C (86.0 F)	15.0 C (59.0 F)	n/a	n/a
Aug	30.0 C (86.0 F)	14.4 C (57.9 F)	n/a	n/a
Sep	32.2 C (90.0 F)	15.0 C (59.0 F)	n/a	n/a
Oct	31.1 C (88.0 F)	13.9 C (57.0 F)	n/a	n/a
Nov	31.7 C (89.1 F)	13.9 C (57.0 F)	n/a	n/a
Dec	30.0 C (86.0 F)	11.1 C (52.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Honomu Mauka 138 still stand. 1918 holds the most, with 169.

Standing records at Honomu Mauka 138 by the year they were set
Year set	Standing records
1915	46
1916	87
1917	92
1918	169
1919	6
1921	18
1923	9
1924	6
1940	162
1941	124
1942	64
1943	73
1944	34
1945	30
1946	37
1947	36
1948	23
1949	39
1950	33
1951	28
1952	89
1953	21
1954	47
1955	89
1956	13
1957	16
1958	19
1959	18
1960	14
1961	6
1962	6
1963	10

All-Time Record Progression

1 new records

1 all-time records were set at Honomu Mauka 138 between 9 March 1942 and 9 March 1942. Each dot is a new record.

Wettest Day of Each Month

Mar: 533.4 mm (21.0 in)

The wettest day on record for each calendar month at Honomu Mauka 138. The most was 533.4 mm (21.0 in) on 9 March 1942.

Record daily precipitation for each month at Honomu Mauka 138
Month	Record daily precipitation (mm)	Date
Jan	357.1 mm (14.1 in)	8 January 1975
Feb	309.4 mm (12.2 in)	2 February 1922
Mar	533.4 mm (21.0 in)	9 March 1942
Apr	306.8 mm (12.1 in)	27 April 1923
May	232.4 mm (9.1 in)	1 May 1916
Jun	221.2 mm (8.7 in)	13 June 1913
Jul	252.7 mm (9.9 in)	27 July 1914
Aug	469.9 mm (18.5 in)	26 August 1970
Sep	230.1 mm (9.1 in)	8 September 1927
Oct	224.5 mm (8.8 in)	26 October 1951
Nov	425.7 mm (16.8 in)	11 November 1915
Dec	294.6 mm (11.6 in)	26 December 1927

Period of Record Coverage

1915 to 1963

32 years of record at Honomu Mauka 138, 1915 to 1963. 15 years have data for under 90 percent of days and are left out of rankings: 1915, 1916, 1917, 1918, 1919, 1921, 1923, 1924 and others.

Days with data per year at Honomu Mauka 138
Year	Days with data	Share of year	Complete
1915	151	41%	No
1916	121	33%	No
1917	139	38%	No
1918	263	72%	No
1919	31	8%	No
1921	31	8%	No
1923	31	8%	No
1924	30	8%	No
1940	366	100%	Yes
1941	365	100%	Yes
1942	305	84%	No
1943	363	99%	Yes
1944	366	100%	Yes
1945	335	92%	Yes
1946	334	92%	Yes
1947	356	98%	Yes
1948	366	100%	Yes
1949	365	100%	Yes
1950	365	100%	Yes
1951	365	100%	Yes
1952	366	100%	Yes
1953	309	85%	No
1954	334	92%	Yes
1955	365	100%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	324	89%	No
1959	344	94%	Yes
1960	306	84%	No
1961	250	68%	No
1962	251	69%	No
1963	111	30%	No

Latest Records

Latest records at Honomu Mauka 138
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
12 August 1977	Honomu Mauka 138, US	daily rain	119.4 mm (4.7 in)	15.3 mm (0.6 in)	40 years	23 of 100 (Routine)
18 May 1977	Honomu Mauka 138, US	daily rain	126.7 mm (5.0 in)	32.2 mm (1.3 in)	3 years	19 of 100 (Routine)
17 November 1976	Honomu Mauka 138, US	daily rain	104.1 mm (4.1 in)	14.9 mm (0.6 in)	15 years	14 of 100 (Routine)
10 November 1976	Honomu Mauka 138, US	daily rain	183.9 mm (7.2 in)	30.5 mm (1.2 in)	61 years	32 of 100 (Routine)
3 March 1976	Honomu Mauka 138, US	daily rain	154.7 mm (6.1 in)	2.3 mm (0.09 in)	29 years	14 of 100 (Routine)
9 January 1975	Honomu Mauka 138, US	daily rain	172.2 mm (6.8 in)	35.0 mm (1.4 in)	4 years	17 of 100 (Routine)
8 January 1975	Honomu Mauka 138, US	monthly rain	357.1 mm (14.1 in)	81.0 mm (3.2 in)	5 years	41 of 100 (Notable)
21 December 1974	Honomu Mauka 138, US	daily rain	182.9 mm (7.2 in)	43.2 mm (1.7 in)	28 years	25 of 100 (Routine)
18 May 1974	Honomu Mauka 138, US	daily rain	94.5 mm (3.7 in)	31.0 mm (1.2 in)	29 years	27 of 100 (Routine)
23 April 1974	Honomu Mauka 138, US	daily rain	100.1 mm (3.9 in)	29.5 mm (1.2 in)	44 years	28 of 100 (Routine)
19 April 1974	Honomu Mauka 138, US	daily rain	137.4 mm (5.4 in)	33.3 mm (1.3 in)	16 years	21 of 100 (Routine)
24 January 1974	Honomu Mauka 138, US	daily rain	146.3 mm (5.8 in)	33.5 mm (1.3 in)	8 years	18 of 100 (Routine)
20 November 1973	Honomu Mauka 138, US	daily rain	209.3 mm (8.2 in)	69.9 mm (2.8 in)	22 years	31 of 100 (Routine)
13 November 1973	Honomu Mauka 138, US	daily rain	337.6 mm (13.3 in)	192.8 mm (7.6 in)	35 years	56 of 100 (Notable)
14 September 1973	Honomu Mauka 138, US	daily rain	104.1 mm (4.1 in)	50.5 mm (2.0 in)	48 years	42 of 100 (Notable)
4 October 1972	Honomu Mauka 138, US	daily rain	155.2 mm (6.1 in)	29.7 mm (1.2 in)	36 years	28 of 100 (Routine)
19 June 1972	Honomu Mauka 138, US	daily rain	36.1 mm (1.4 in)	1.0 mm (0.04 in)	44 years	19 of 100 (Routine)
17 April 1972	Honomu Mauka 138, US	daily rain	209.6 mm (8.3 in)	51.9 mm (2.0 in)	9 years	24 of 100 (Routine)
2 April 1972	Honomu Mauka 138, US	daily rain	199.6 mm (7.9 in)	128.0 mm (5.0 in)	5 years	47 of 100 (Notable)
22 January 1972	Honomu Mauka 138, US	daily rain	108.0 mm (4.3 in)	17.6 mm (0.7 in)	16 years	16 of 100 (Routine)

Climate Trend

13 complete years, 1940 to 1957

One stripe for each of 13 complete years at Honomu Mauka 138, 1940 to 1957. Blue stripes are years cooler than the station's own mean of 20.6 C (69.1 F); red stripes are warmer. The coolest year was 1955, at 19.6 C (67.3 F), and the warmest was 1940, at 21.6 C (71.0 F). The strongest colour marks a difference of 1.1 C (2.0 F).

Annual mean temperature at Honomu Mauka 138 as warming stripes, 1940 to 1957
Year	Annual mean temperature	Difference from the station mean
1940	21.6 C	+1.04 C
1941	21.5 C	+0.90 C
1943	21.5 C	+0.93 C
1944	20.9 C	+0.29 C
1947	20.7 C	+0.12 C
1948	20.2 C	-0.39 C
1949	20.0 C	-0.65 C
1950	20.4 C	-0.25 C
1951	20.4 C	-0.19 C
1952	19.7 C	-0.90 C
1955	19.6 C	-1.01 C
1956	20.6 C	+0.03 C
1957	20.7 C	+0.11 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

1911 to 1978

Yearly extremes at Honomu Mauka 138: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	32.2 C (90.0 F)	1940	28.3 C (82.9 F)	32
Coldest night (TNn)	9.4 C (48.9 F)	1954	13.3 C (55.9 F)	32
Wettest day (Rx1day)	533.4 mm (21.0 in)	1942	210.6 mm (8.3 in)	68
Wettest five days (Rx5day)	1,252.0 mm (49.3 in)	1969	454.0 mm (17.9 in)	68
Longest dry spell (CDD)	23 days	1960	8 days	68

Hottest day (TXx)

The hottest day of the year at Honomu Mauka 138, 1911 to 1978. The record is 32.2 C (90.0 F) in 1940, marked on the chart; the median year is 28.3 C (82.9 F).

Hottest day (TXx) at Honomu Mauka 138 by year
Year	Hottest day (TXx)
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	29.4 C (84.9 F)
1916	30.0 C (86.0 F)
1917	30.0 C (86.0 F)
1918	31.1 C (88.0 F)
1919	28.9 C (84.0 F)
1920	n/a
1921	27.8 C (82.0 F)
1922	n/a
1923	25.6 C (78.1 F)
1924	27.8 C (82.0 F)
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	32.2 C (90.0 F)
1941	30.6 C (87.1 F)
1942	30.0 C (86.0 F)
1943	31.1 C (88.0 F)
1944	28.3 C (82.9 F)
1945	28.9 C (84.0 F)
1946	28.3 C (82.9 F)
1947	28.9 C (84.0 F)
1948	27.2 C (81.0 F)
1949	26.7 C (80.1 F)
1950	28.9 C (84.0 F)
1951	27.8 C (82.0 F)
1952	28.3 C (82.9 F)
1953	27.2 C (81.0 F)
1954	28.3 C (82.9 F)
1955	26.7 C (80.1 F)
1956	27.2 C (81.0 F)
1957	27.8 C (82.0 F)
1958	27.8 C (82.0 F)
1959	27.2 C (81.0 F)
1960	27.2 C (81.0 F)
1961	28.3 C (82.9 F)
1962	27.8 C (82.0 F)
1963	27.8 C (82.0 F)
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

Coldest night (TNn)

The coldest night of the year at Honomu Mauka 138, 1911 to 1978. The record is 9.4 C (48.9 F) in 1954, marked on the chart; the median year is 13.3 C (55.9 F).

Coldest night (TNn) at Honomu Mauka 138 by year
Year	Coldest night (TNn)
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	15.6 C (60.1 F)
1916	15.6 C (60.1 F)
1917	18.9 C (66.0 F)
1918	14.4 C (57.9 F)
1919	17.8 C (64.0 F)
1920	n/a
1921	15.6 C (60.1 F)
1922	n/a
1923	15.6 C (60.1 F)
1924	15.6 C (60.1 F)
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	11.1 C (52.0 F)
1941	12.8 C (55.0 F)
1942	12.8 C (55.0 F)
1943	10.6 C (51.1 F)
1944	12.2 C (54.0 F)
1945	13.3 C (55.9 F)
1946	13.9 C (57.0 F)
1947	12.8 C (55.0 F)
1948	13.3 C (55.9 F)
1949	12.2 C (54.0 F)
1950	13.3 C (55.9 F)
1951	10.6 C (51.1 F)
1952	13.3 C (55.9 F)
1953	12.8 C (55.0 F)
1954	9.4 C (48.9 F)
1955	12.8 C (55.0 F)
1956	13.9 C (57.0 F)
1957	13.3 C (55.9 F)
1958	12.8 C (55.0 F)
1959	13.3 C (55.9 F)
1960	12.8 C (55.0 F)
1961	11.7 C (53.1 F)
1962	12.2 C (54.0 F)
1963	14.4 C (57.9 F)
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

Wettest day (Rx1day)

The wettest day of the year at Honomu Mauka 138, 1911 to 1978. The record is 533.4 mm (21.0 in) in 1942, marked on the chart; the median year is 210.6 mm (8.3 in).

Wettest day (Rx1day) at Honomu Mauka 138 by year
Year	Wettest day (Rx1day)
1911	150.1 mm (5.9 in)
1912	130.3 mm (5.1 in)
1913	226.6 mm (8.9 in)
1914	313.2 mm (12.3 in)
1915	425.7 mm (16.8 in)
1916	232.4 mm (9.1 in)
1917	220.7 mm (8.7 in)
1918	300.7 mm (11.8 in)
1919	118.9 mm (4.7 in)
1920	158.0 mm (6.2 in)
1921	257.8 mm (10.1 in)
1922	309.4 mm (12.2 in)
1923	306.8 mm (12.1 in)
1924	246.9 mm (9.7 in)
1925	119.6 mm (4.7 in)
1926	178.6 mm (7.0 in)
1927	294.6 mm (11.6 in)
1928	147.3 mm (5.8 in)
1929	191.5 mm (7.5 in)
1930	153.4 mm (6.0 in)
1931	129.8 mm (5.1 in)
1932	183.6 mm (7.2 in)
1933	130.0 mm (5.1 in)
1934	145.3 mm (5.7 in)
1935	131.8 mm (5.2 in)
1936	158.0 mm (6.2 in)
1937	171.2 mm (6.7 in)
1938	174.8 mm (6.9 in)
1939	259.8 mm (10.2 in)
1940	129.8 mm (5.1 in)
1941	101.6 mm (4.0 in)
1942	533.4 mm (21.0 in)
1943	105.4 mm (4.1 in)
1944	158.8 mm (6.3 in)
1945	273.1 mm (10.8 in)
1946	292.1 mm (11.5 in)
1947	218.4 mm (8.6 in)
1948	257.6 mm (10.1 in)
1949	190.5 mm (7.5 in)
1950	254.0 mm (10.0 in)
1951	256.8 mm (10.1 in)
1952	120.7 mm (4.8 in)
1953	273.3 mm (10.8 in)
1954	225.3 mm (8.9 in)
1955	122.2 mm (4.8 in)
1956	214.6 mm (8.4 in)
1957	211.6 mm (8.3 in)
1958	255.3 mm (10.1 in)
1959	262.6 mm (10.3 in)
1960	191.8 mm (7.6 in)
1961	185.4 mm (7.3 in)
1962	92.7 mm (3.6 in)
1963	182.6 mm (7.2 in)
1964	225.3 mm (8.9 in)
1965	161.8 mm (6.4 in)
1966	235.7 mm (9.3 in)
1967	257.6 mm (10.1 in)
1968	211.8 mm (8.3 in)
1969	304.8 mm (12.0 in)
1970	469.9 mm (18.5 in)
1971	217.4 mm (8.6 in)
1972	209.6 mm (8.3 in)
1973	337.6 mm (13.3 in)
1974	182.9 mm (7.2 in)
1975	357.1 mm (14.1 in)
1976	200.2 mm (7.9 in)
1977	126.7 mm (5.0 in)
1978	101.6 mm (4.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Honomu Mauka 138, 1911 to 1978. The record is 1,252.0 mm (49.3 in) in 1969, marked on the chart; the median year is 454.0 mm (17.9 in).

Wettest five days (Rx5day) at Honomu Mauka 138 by year
Year	Wettest five days (Rx5day)
1911	472.7 mm (18.6 in)
1912	390.5 mm (15.4 in)
1913	539.6 mm (21.2 in)
1914	643.6 mm (25.3 in)
1915	795.0 mm (31.3 in)
1916	590.0 mm (23.2 in)
1917	279.8 mm (11.0 in)
1918	451.0 mm (17.8 in)
1919	255.5 mm (10.1 in)
1920	429.0 mm (16.9 in)
1921	999.0 mm (39.3 in)
1922	817.1 mm (32.2 in)
1923	836.9 mm (32.9 in)
1924	425.7 mm (16.8 in)
1925	385.1 mm (15.2 in)
1926	344.0 mm (13.5 in)
1927	804.9 mm (31.7 in)
1928	366.4 mm (14.4 in)
1929	425.8 mm (16.8 in)
1930	314.7 mm (12.4 in)
1931	355.2 mm (14.0 in)
1932	627.8 mm (24.7 in)
1933	356.1 mm (14.0 in)
1934	320.6 mm (12.6 in)
1935	520.5 mm (20.5 in)
1936	515.2 mm (20.3 in)
1937	635.6 mm (25.0 in)
1938	499.2 mm (19.7 in)
1939	541.0 mm (21.3 in)
1940	260.2 mm (10.2 in)
1941	328.9 mm (12.9 in)
1942	1,103.5 mm (43.4 in)
1943	185.4 mm (7.3 in)
1944	373.8 mm (14.7 in)
1945	601.0 mm (23.7 in)
1946	589.7 mm (23.2 in)
1947	469.1 mm (18.5 in)
1948	606.9 mm (23.9 in)
1949	328.7 mm (12.9 in)
1950	452.1 mm (17.8 in)
1951	454.1 mm (17.9 in)
1952	406.8 mm (16.0 in)
1953	352.1 mm (13.9 in)
1954	710.6 mm (28.0 in)
1955	294.2 mm (11.6 in)
1956	462.0 mm (18.2 in)
1957	543.3 mm (21.4 in)
1958	417.6 mm (16.4 in)
1959	443.0 mm (17.4 in)
1960	524.6 mm (20.7 in)
1961	142.8 mm (5.6 in)
1962	54.1 mm (2.1 in)
1963	673.5 mm (26.5 in)
1964	645.3 mm (25.4 in)
1965	457.2 mm (18.0 in)
1966	475.5 mm (18.7 in)
1967	523.9 mm (20.6 in)
1968	469.3 mm (18.5 in)
1969	1,252.0 mm (49.3 in)
1970	738.7 mm (29.1 in)
1971	407.9 mm (16.1 in)
1972	363.8 mm (14.3 in)
1973	453.9 mm (17.9 in)
1974	422.9 mm (16.6 in)
1975	685.3 mm (27.0 in)
1976	291.6 mm (11.5 in)
1977	143.5 mm (5.6 in)
1978	118.4 mm (4.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Honomu Mauka 138, 1911 to 1978. The record is 23 days in 1960, marked on the chart; the median year is 8 days.

Longest dry spell (CDD) at Honomu Mauka 138 by year
Year	Longest dry spell (CDD)
1911	6 days
1912	14 days
1913	12 days
1914	7 days
1915	7 days
1916	9 days
1917	14 days
1918	5 days
1919	14 days
1920	6 days
1921	15 days
1922	5 days
1923	7 days
1924	15 days
1925	4 days
1926	1 day
1927	3 days
1928	4 days
1929	3 days
1930	2 days
1931	4 days
1932	3 days
1933	5 days
1934	6 days
1935	6 days
1936	5 days
1937	5 days
1938	4 days
1939	8 days
1940	15 days
1941	10 days
1942	8 days
1943	11 days
1944	8 days
1945	18 days
1946	3 days
1947	8 days
1948	5 days
1949	6 days
1950	6 days
1951	14 days
1952	8 days
1953	18 days
1954	14 days
1955	5 days
1956	8 days
1957	7 days
1958	9 days
1959	6 days
1960	23 days
1961	8 days
1962	9 days
1963	9 days
1964	7 days
1965	8 days
1966	6 days
1967	9 days
1968	8 days
1969	9 days
1970	9 days
1971	11 days
1972	11 days
1973	8 days
1974	12 days
1975	7 days
1976	5 days
1977	8 days
1978	12 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

50 years, 1912 to 1974

A day with at least 219.7 mm (8.6 in) of rain is expected about once in 2 years. A day with at least 488.2 mm (19.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Honomu Mauka 138: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	219.7 mm (8.6 in)
5 years	296.1 mm (11.7 in)
10 years	344.8 mm (13.6 in)
25 years	404.3 mm (15.9 in)
50 years	447.0 mm (17.6 in)
100 years	488.2 mm (19.2 in)	Longer than the 50 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, 50 years of values from 1912 to 1974.

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: 533.4 mm (21.0 in) in 1942; 469.9 mm (18.5 in) in 1970; 425.7 mm (16.8 in) in 1915.

Download the Data

Data for Honomu Mauka 138 standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Honomu Mauka 138 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).