Mauna Loa 511 Weather Records (USC00516190)

Record envelope, standing records and threshold days for Mauna Loa 511 (USC00516190), Hawaii, United States, with 71 years of record.

Key Facts for Mauna Loa 511

Mauna Loa 511 (USC00516190) is a weather station in Hawaii, United States at 21.13 latitude and -157.21 longitude, 307 m (1,008 ft) above sea level.
The station reports from 1949 to 2019, 71 years of record.
1,452 records set at Mauna Loa 511 still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Mauna Loa 511 set a daily record precipitation of 10.9 mm (0.4 in) on 12 February 2019.

About the Station

Location: Hawaii, United States, 21.13 latitude, -157.21 longitude.
Elevation: 307 m (1,008 ft).
Period of record: 1949 to 2019, 71 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 Mauna Loa 511. 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 Mauna Loa 511, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	27.2 C (81.0 F)	9.4 C (48.9 F)	n/a	n/a
Feb	31.1 C (88.0 F)	10.6 C (51.1 F)	n/a	n/a
Mar	27.2 C (81.0 F)	12.8 C (55.0 F)	n/a	n/a
Apr	28.3 C (82.9 F)	14.4 C (57.9 F)	n/a	n/a
May	31.1 C (88.0 F)	15.6 C (60.1 F)	n/a	n/a
Jun	30.0 C (86.0 F)	16.1 C (61.0 F)	n/a	n/a
Jul	31.1 C (88.0 F)	16.1 C (61.0 F)	n/a	n/a
Aug	31.7 C (89.1 F)	15.6 C (60.1 F)	n/a	n/a
Sep	31.7 C (89.1 F)	16.1 C (61.0 F)	n/a	n/a
Oct	31.1 C (88.0 F)	17.2 C (63.0 F)	n/a	n/a
Nov	29.4 C (84.9 F)	16.1 C (61.0 F)	n/a	n/a
Dec	28.3 C (82.9 F)	11.1 C (52.0 F)	n/a	n/a

Which Years Hold Standing Records

1,452 standing records

1,452 records at Mauna Loa 511 still stand. 1951 holds the most, with 347.

All-Time Record Progression

1 new records

1 all-time records were set at Mauna Loa 511 between 2 January 2004 and 2 January 2004. Each dot is a new record.

Wettest Day of Each Month

Jan: 177.8 mm (7.0 in)

The wettest day on record for each calendar month at Mauna Loa 511. The most was 177.8 mm (7.0 in) on 2 January 2004.

Record daily precipitation for each month at Mauna Loa 511
Month	Record daily precipitation (mm)	Date
Jan	177.8 mm (7.0 in)	2 January 2004
Feb	88.1 mm (3.5 in)	28 February 1966
Mar	168.7 mm (6.6 in)	14 March 1951
Apr	107.2 mm (4.2 in)	14 April 1965
May	79.5 mm (3.1 in)	17 May 2004
Jun	21.6 mm (0.9 in)	28 June 1974
Jul	39.6 mm (1.6 in)	15 July 2016
Aug	50.8 mm (2.0 in)	4 August 2004
Sep	54.6 mm (2.1 in)	14 September 2007
Oct	93.7 mm (3.7 in)	24 October 2017
Nov	142.2 mm (5.6 in)	10 November 1955
Dec	128.3 mm (5.1 in)	20 December 1955

Period of Record Coverage

1949 to 1977

9 years of record at Mauna Loa 511, 1949 to 1977. 9 years have data for under 90 percent of days and are left out of rankings: 1949, 1950, 1951, 1952, 1953, 1954, 1964, 1972 and others.

Latest Records

Latest records at Mauna Loa 511
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
12 February 2019	Mauna Loa 511, US	daily rain	10.9 mm (0.4 in)	7.1 mm (0.28 in)	60 years	20 of 100 (Routine)
24 January 2019	Mauna Loa 511, US	daily rain	9.9 mm (0.39 in)	0.2 mm (0.01 in)	56 years	20 of 100 (Routine)
12 October 2018	Mauna Loa 511, US	daily rain	28.4 mm (1.1 in)	22.0 mm (0.9 in)	61 years	41 of 100 (Notable)
28 September 2018	Mauna Loa 511, US	daily rain	45.2 mm (1.8 in)	19.0 mm (0.7 in)	44 years	42 of 100 (Notable)
27 September 2018	Mauna Loa 511, US	daily rain	20.1 mm (0.8 in)	7.4 mm (0.29 in)	11 years	18 of 100 (Routine)
28 August 2018	Mauna Loa 511, US	daily rain	43.7 mm (1.7 in)	41.2 mm (1.6 in)	11 years	50 of 100 (Notable)
26 June 2018	Mauna Loa 511, US	daily rain	3.6 mm (0.14 in)	0.8 mm (0.03 in)	55 years	20 of 100 (Routine)
27 April 2018	Mauna Loa 511, US	daily rain	11.4 mm (0.4 in)	6.1 mm (0.24 in)	40 years	20 of 100 (Routine)
6 April 2018	Mauna Loa 511, US	daily rain	5.6 mm (0.22 in)	4.3 mm (0.17 in)	40 years	20 of 100 (Routine)
16 February 2018	Mauna Loa 511, US	daily rain	35.8 mm (1.4 in)	4.3 mm (0.17 in)	56 years	26 of 100 (Routine)
6 February 2018	Mauna Loa 511, US	daily rain	41.7 mm (1.6 in)	38.7 mm (1.5 in)	4 years	41 of 100 (Notable)
26 October 2017	Mauna Loa 511, US	daily rain	9.4 mm (0.37 in)	1.0 mm (0.04 in)	12 years	9 of 100 (Routine)
24 October 2017	Mauna Loa 511, US	monthly rain	93.7 mm (3.7 in)	13.2 mm (0.5 in)	15 years	31 of 100 (Routine)
29 August 2017	Mauna Loa 511, US	daily rain	8.9 mm (0.35 in)	0.8 mm (0.03 in)	60 years	20 of 100 (Routine)
13 July 2017	Mauna Loa 511, US	daily rain	4.6 mm (0.18 in)	1.3 mm (0.05 in)	62 years	20 of 100 (Routine)
12 July 2017	Mauna Loa 511, US	daily rain	7.1 mm (0.28 in)	3.3 mm (0.13 in)	52 years	20 of 100 (Routine)
25 May 2017	Mauna Loa 511, US	daily rain	15.2 mm (0.6 in)	8.6 mm (0.34 in)	56 years	20 of 100 (Routine)
21 April 2017	Mauna Loa 511, US	daily rain	13.7 mm (0.5 in)	1.0 mm (0.04 in)	12 years	9 of 100 (Routine)
17 March 2017	Mauna Loa 511, US	daily rain	2.8 mm (0.11 in)	1.0 mm (0.04 in)	66 years	20 of 100 (Routine)
7 February 2017	Mauna Loa 511, US	daily rain	22.4 mm (0.9 in)	1.3 mm (0.05 in)	5 years	8 of 100 (Routine)

Extremes by Year

1949 to 2019

Yearly extremes at Mauna Loa 511: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	31.7 C (89.1 F)	1953	31.1 C (88.0 F)	9
Coldest night (TNn)	9.4 C (48.9 F)	1950	13.3 C (55.9 F)	9
Wettest day (Rx1day)	177.8 mm (7.0 in)	2004	54.8 mm (2.2 in)	48
Wettest five days (Rx5day)	385.2 mm (15.2 in)	2004	62.7 mm (2.5 in)	42
Longest dry spell (CDD)	70 days	2003	26 days	48

Hottest day (TXx)

The hottest day of the year at Mauna Loa 511, 1949 to 2019. The record is 31.7 C (89.1 F) in 1953, marked on the chart; the median year is 31.1 C (88.0 F).

Hottest day (TXx) at Mauna Loa 511 by year
Year	Hottest day (TXx)
1949	30.0 C (86.0 F)
1950	30.0 C (86.0 F)
1951	30.0 C (86.0 F)
1952	31.1 C (88.0 F)
1953	31.7 C (89.1 F)
1954	31.1 C (88.0 F)
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	25.6 C (78.1 F)
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	31.7 C (89.1 F)
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	31.1 C (88.0 F)
1978	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a
2011	n/a
2012	n/a
2013	n/a
2014	n/a
2015	n/a
2016	n/a
2017	n/a
2018	n/a
2019	n/a

Coldest night (TNn)

The coldest night of the year at Mauna Loa 511, 1949 to 2019. The record is 9.4 C (48.9 F) in 1950, marked on the chart; the median year is 13.3 C (55.9 F).

Coldest night (TNn) at Mauna Loa 511 by year
Year	Coldest night (TNn)
1949	16.7 C (62.1 F)
1950	9.4 C (48.9 F)
1951	12.2 C (54.0 F)
1952	13.3 C (55.9 F)
1953	11.1 C (52.0 F)
1954	12.8 C (55.0 F)
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	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	16.7 C (62.1 F)
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	17.2 C (63.0 F)
1978	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a
2011	n/a
2012	n/a
2013	n/a
2014	n/a
2015	n/a
2016	n/a
2017	n/a
2018	n/a
2019	n/a

Wettest day (Rx1day)

The wettest day of the year at Mauna Loa 511, 1949 to 2019. The record is 177.8 mm (7.0 in) in 2004, marked on the chart; the median year is 54.8 mm (2.2 in).

Wettest day (Rx1day) at Mauna Loa 511 by year
Year	Wettest day (Rx1day)
1949	8.4 mm (0.33 in)
1950	96.3 mm (3.8 in)
1951	168.7 mm (6.6 in)
1952	24.4 mm (1.0 in)
1953	30.7 mm (1.2 in)
1954	42.4 mm (1.7 in)
1955	142.2 mm (5.6 in)
1956	87.6 mm (3.4 in)
1957	87.6 mm (3.4 in)
1958	70.4 mm (2.8 in)
1959	59.2 mm (2.3 in)
1960	31.2 mm (1.2 in)
1961	81.3 mm (3.2 in)
1962	50.8 mm (2.0 in)
1963	86.4 mm (3.4 in)
1964	39.9 mm (1.6 in)
1965	107.2 mm (4.2 in)
1966	111.3 mm (4.4 in)
1967	88.4 mm (3.5 in)
1968	71.6 mm (2.8 in)
1969	72.1 mm (2.8 in)
1970	24.1 mm (0.9 in)
1971	58.4 mm (2.3 in)
1972	48.8 mm (1.9 in)
1973	34.8 mm (1.4 in)
1974	59.9 mm (2.4 in)
1975	27.7 mm (1.1 in)
1976	48.8 mm (1.9 in)
1977	51.1 mm (2.0 in)
1978	21.6 mm (0.9 in)
2002	80.5 mm (3.2 in)
2003	43.7 mm (1.7 in)
2004	177.8 mm (7.0 in)
2005	78.7 mm (3.1 in)
2006	61.0 mm (2.4 in)
2007	88.1 mm (3.5 in)
2008	66.0 mm (2.6 in)
2009	29.5 mm (1.2 in)
2010	12.7 mm (0.5 in)
2011	78.2 mm (3.1 in)
2012	31.5 mm (1.2 in)
2013	36.1 mm (1.4 in)
2014	49.5 mm (1.9 in)
2015	37.6 mm (1.5 in)
2016	39.6 mm (1.6 in)
2017	93.7 mm (3.7 in)
2018	45.2 mm (1.8 in)
2019	17.0 mm (0.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Mauna Loa 511, 1949 to 2019. The record is 385.2 mm (15.2 in) in 2004, marked on the chart; the median year is 62.7 mm (2.5 in).

Wettest five days (Rx5day) at Mauna Loa 511 by year
Year	Wettest five days (Rx5day)
1949	9.9 mm (0.39 in)
1950	188.7 mm (7.4 in)
1951	225.3 mm (8.9 in)
1952	27.4 mm (1.1 in)
1953	59.4 mm (2.3 in)
1954	46.8 mm (1.8 in)
1955	203.0 mm (8.0 in)
1956	90.9 mm (3.6 in)
1957	114.6 mm (4.5 in)
1958	44.0 mm (1.7 in)
1959	19.3 mm (0.8 in)
1960	44.2 mm (1.7 in)
1961	213.4 mm (8.4 in)
1962	102.3 mm (4.0 in)
1963	88.5 mm (3.5 in)
1964	35.0 mm (1.4 in)
1965	225.1 mm (8.9 in)
1966	145.5 mm (5.7 in)
1967	99.6 mm (3.9 in)
1968	98.8 mm (3.9 in)
1969	129.8 mm (5.1 in)
1970	11.7 mm (0.5 in)
1971	59.2 mm (2.3 in)
1972	11.4 mm (0.4 in)
1973	47.7 mm (1.9 in)
1974	48.5 mm (1.9 in)
1975	10.7 mm (0.4 in)
1976	29.4 mm (1.2 in)
1977	92.7 mm (3.6 in)
1978	40.7 mm (1.6 in)
2002	170.6 mm (6.7 in)
2003	73.4 mm (2.9 in)
2004	385.2 mm (15.2 in)
2005	120.3 mm (4.7 in)
2006	94.5 mm (3.7 in)
2007	102.3 mm (4.0 in)
2008	66.0 mm (2.6 in)
2009	31.8 mm (1.3 in)
2010	12.7 mm (0.5 in)
2011	n/a
2012	3.9 mm (0.15 in)
2013	31.2 mm (1.2 in)
2014	n/a
2015	0.3 mm (0.01 in)
2016	n/a
2017	n/a
2018	n/a
2019	n/a

Longest dry spell (CDD)

The longest dry spell of the year at Mauna Loa 511, 1949 to 2019. The record is 70 days in 2003, marked on the chart; the median year is 26 days.

Longest dry spell (CDD) at Mauna Loa 511 by year
Year	Longest dry spell (CDD)
1949	12 days
1950	28 days
1951	14 days
1952	36 days
1953	30 days
1954	36 days
1955	23 days
1956	30 days
1957	41 days
1958	18 days
1959	15 days
1960	13 days
1961	20 days
1962	35 days
1963	13 days
1964	33 days
1965	41 days
1966	47 days
1967	26 days
1968	25 days
1969	26 days
1970	45 days
1971	32 days
1972	44 days
1973	19 days
1974	21 days
1975	15 days
1976	31 days
1977	42 days
1978	11 days
2002	25 days
2003	70 days
2004	40 days
2005	26 days
2006	55 days
2007	39 days
2008	57 days
2009	28 days
2010	21 days
2011	4 days
2012	10 days
2013	4 days
2014	4 days
2015	8 days
2016	4 days
2017	4 days
2018	4 days
2019	4 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.

Download the Data

Data for Mauna Loa 511 standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Mauna Loa 511 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).

Days with data per year at Mauna Loa 511
Year	Days with data	Share of year	Complete
1949	72	20%	No
1950	297	81%	No
1951	307	84%	No
1952	271	74%	No
1953	263	72%	No
1954	263	72%	No
1964	19	5%	No
1972	19	5%	No
1977	19	5%	No