Mona Island 2 Weather Records (RQC00666258)

Record envelope, standing records and threshold days for Mona Island 2 (RQC00666258), PR, Puerto Rico [United States], with 31 years of record.

Key Facts for Mona Island 2

Mona Island 2 (RQC00666258) is a weather station in PR, Puerto Rico [United States] at 18.09 latitude and -67.94 longitude, 2 m (7 ft) above sea level.
The station reports from 1980 to 2010, 31 years of record.
1,464 records set at Mona Island 2 still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Mona Island 2 set a daily record precipitation of 18.0 mm (0.7 in) on 4 May 2010.

About the Station

Location: PR, Puerto Rico [United States], 18.09 latitude, -67.94 longitude.
Elevation: 2 m (7 ft).
Period of record: 1980 to 2010, 31 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 Mona Island 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 Mona Island 2, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	35.6 C (96.1 F)	13.9 C (57.0 F)	n/a	n/a
Feb	35.6 C (96.1 F)	14.4 C (57.9 F)	n/a	n/a
Mar	36.1 C (97.0 F)	14.4 C (57.9 F)	n/a	n/a
Apr	37.2 C (99.0 F)	16.1 C (61.0 F)	n/a	n/a
May	36.7 C (98.1 F)	13.9 C (57.0 F)	n/a	n/a
Jun	39.4 C (102.9 F)	16.1 C (61.0 F)	n/a	n/a
Jul	40.0 C (104.0 F)	13.9 C (57.0 F)	n/a	n/a
Aug	40.6 C (105.1 F)	15.6 C (60.1 F)	n/a	n/a
Sep	38.9 C (102.0 F)	16.1 C (61.0 F)	n/a	n/a
Oct	36.1 C (97.0 F)	16.1 C (61.0 F)	n/a	n/a
Nov	36.7 C (98.1 F)	15.0 C (59.0 F)	n/a	n/a
Dec	35.6 C (96.1 F)	15.6 C (60.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Mona Island 2 still stand. 1996 holds the most, with 152.

Standing records at Mona Island 2 by the year they were set
Year set	Standing records
1980	47
1981	76
1982	58
1983	50
1984	53
1985	30
1986	19
1987	44
1988	40
1989	39
1990	15
1991	18
1992	11
1993	15
1994	18
1995	46
1996	152
1997	64
1998	114
1999	59
2000	25
2001	114
2002	114
2003	21
2004	68
2005	77
2006	10
2007	15
2008	32
2009	9
2010	11

Wettest Day of Each Month

Oct: 256.5 mm (10.1 in)

The wettest day on record for each calendar month at Mona Island 2. The most was 256.5 mm (10.1 in) on 8 October 1985.

Record daily precipitation for each month at Mona Island 2
Month	Record daily precipitation (mm)	Date
Jan	76.2 mm (3.0 in)	22 January 1997
Feb	135.9 mm (5.4 in)	12 February 1987
Mar	165.1 mm (6.5 in)	31 March 2006
Apr	97.5 mm (3.8 in)	21 April 1983
May	149.4 mm (5.9 in)	15 May 1986
Jun	97.3 mm (3.8 in)	5 June 2002
Jul	59.7 mm (2.4 in)	30 July 1996
Aug	147.3 mm (5.8 in)	16 August 2008
Sep	153.7 mm (6.1 in)	13 September 1982
Oct	256.5 mm (10.1 in)	8 October 1985
Nov	66.0 mm (2.6 in)	4 November 1983
Dec	102.9 mm (4.1 in)	7 December 2003

Period of Record Coverage

1980 to 2010

31 years of record at Mona Island 2, 1980 to 2010. 20 years have data for under 90 percent of days and are left out of rankings: 1980, 1981, 1982, 1983, 1985, 1987, 1988, 1989 and others.

Days with data per year at Mona Island 2
Year	Days with data	Share of year	Complete
1980	193	53%	No
1981	277	76%	No
1982	243	67%	No
1983	302	83%	No
1984	362	99%	Yes
1985	302	83%	No
1986	364	100%	Yes
1987	265	73%	No
1988	308	84%	No
1989	220	60%	No
1990	328	90%	No
1991	361	99%	Yes
1992	182	50%	No
1993	362	99%	Yes
1994	299	82%	No
1995	310	85%	No
1996	286	78%	No
1997	331	91%	Yes
1998	247	68%	No
1999	330	90%	Yes
2000	345	94%	Yes
2001	360	99%	Yes
2002	305	84%	No
2003	365	100%	Yes
2004	326	89%	No
2005	284	78%	No
2006	351	96%	Yes
2007	299	82%	No
2008	340	93%	Yes
2009	222	61%	No
2010	99	27%	No

Latest Records

Latest records at Mona Island 2
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
4 May 2010	Mona Island 2, PR	daily rain	18.0 mm (0.7 in)	7.1 mm (0.28 in)	13 years	11 of 100 (Routine)
5 March 2010	Mona Island 2, PR	daily rain	19.8 mm (0.8 in)	2.0 mm (0.08 in)	19 years	9 of 100 (Routine)

Extremes by Year

1980 to 2010

Yearly extremes at Mona Island 2: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.6 C (105.1 F)	1996	35.0 C (95.0 F)	31
Coldest night (TNn)	13.9 C (57.0 F)	1985	16.1 C (61.0 F)	31
Wettest day (Rx1day)	256.5 mm (10.1 in)	1985	80.0 mm (3.1 in)	31
Wettest five days (Rx5day)	348.2 mm (13.7 in)	1985	124.3 mm (4.9 in)	31
Longest dry spell (CDD)	61 days	2005	20 days	31

Hottest day (TXx)

The hottest day of the year at Mona Island 2, 1980 to 2010. The record is 40.6 C (105.1 F) in 1996, marked on the chart; the median year is 35.0 C (95.0 F).

Hottest day (TXx) at Mona Island 2 by year
Year	Hottest day (TXx)
1980	33.9 C (93.0 F)
1981	34.4 C (93.9 F)
1982	36.1 C (97.0 F)
1983	33.9 C (93.0 F)
1984	33.3 C (91.9 F)
1985	34.4 C (93.9 F)
1986	33.3 C (91.9 F)
1987	35.0 C (95.0 F)
1988	34.4 C (93.9 F)
1989	33.9 C (93.0 F)
1990	35.6 C (96.1 F)
1991	33.9 C (93.0 F)
1992	33.3 C (91.9 F)
1993	33.9 C (93.0 F)
1994	36.7 C (98.1 F)
1995	35.0 C (95.0 F)
1996	40.6 C (105.1 F)
1997	36.1 C (97.0 F)
1998	36.1 C (97.0 F)
1999	36.1 C (97.0 F)
2000	35.6 C (96.1 F)
2001	37.2 C (99.0 F)
2002	35.6 C (96.1 F)
2003	36.7 C (98.1 F)
2004	35.0 C (95.0 F)
2005	36.1 C (97.0 F)
2006	35.6 C (96.1 F)
2007	35.6 C (96.1 F)
2008	35.6 C (96.1 F)
2009	35.0 C (95.0 F)
2010	35.0 C (95.0 F)

Coldest night (TNn)

The coldest night of the year at Mona Island 2, 1980 to 2010. The record is 13.9 C (57.0 F) in 1985, marked on the chart; the median year is 16.1 C (61.0 F).

Coldest night (TNn) at Mona Island 2 by year
Year	Coldest night (TNn)
1980	15.6 C (60.1 F)
1981	14.4 C (57.9 F)
1982	14.4 C (57.9 F)
1983	16.7 C (62.1 F)
1984	16.1 C (61.0 F)
1985	13.9 C (57.0 F)
1986	16.1 C (61.0 F)
1987	16.1 C (61.0 F)
1988	16.1 C (61.0 F)
1989	16.1 C (61.0 F)
1990	16.7 C (62.1 F)
1991	15.0 C (59.0 F)
1992	18.9 C (66.0 F)
1993	13.9 C (57.0 F)
1994	18.3 C (64.9 F)
1995	16.1 C (61.0 F)
1996	15.6 C (60.1 F)
1997	18.3 C (64.9 F)
1998	16.7 C (62.1 F)
1999	16.1 C (61.0 F)
2000	13.9 C (57.0 F)
2001	15.6 C (60.1 F)
2002	15.6 C (60.1 F)
2003	15.6 C (60.1 F)
2004	18.3 C (64.9 F)
2005	18.3 C (64.9 F)
2006	17.8 C (64.0 F)
2007	16.7 C (62.1 F)
2008	15.6 C (60.1 F)
2009	15.6 C (60.1 F)
2010	16.1 C (61.0 F)

Wettest day (Rx1day)

The wettest day of the year at Mona Island 2, 1980 to 2010. The record is 256.5 mm (10.1 in) in 1985, marked on the chart; the median year is 80.0 mm (3.1 in).

Wettest day (Rx1day) at Mona Island 2 by year
Year	Wettest day (Rx1day)
1980	90.2 mm (3.6 in)
1981	80.0 mm (3.1 in)
1982	153.7 mm (6.1 in)
1983	97.5 mm (3.8 in)
1984	53.6 mm (2.1 in)
1985	256.5 mm (10.1 in)
1986	149.4 mm (5.9 in)
1987	153.2 mm (6.0 in)
1988	43.2 mm (1.7 in)
1989	50.8 mm (2.0 in)
1990	92.2 mm (3.6 in)
1991	73.7 mm (2.9 in)
1992	40.1 mm (1.6 in)
1993	38.9 mm (1.5 in)
1994	32.3 mm (1.3 in)
1995	114.3 mm (4.5 in)
1996	59.7 mm (2.4 in)
1997	76.2 mm (3.0 in)
1998	50.8 mm (2.0 in)
1999	61.0 mm (2.4 in)
2000	61.0 mm (2.4 in)
2001	80.0 mm (3.1 in)
2002	97.3 mm (3.8 in)
2003	110.7 mm (4.4 in)
2004	81.8 mm (3.2 in)
2005	106.7 mm (4.2 in)
2006	165.1 mm (6.5 in)
2007	40.6 mm (1.6 in)
2008	147.3 mm (5.8 in)
2009	38.4 mm (1.5 in)
2010	27.4 mm (1.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Mona Island 2, 1980 to 2010. The record is 348.2 mm (13.7 in) in 1985, marked on the chart; the median year is 124.3 mm (4.9 in).

Wettest five days (Rx5day) at Mona Island 2 by year
Year	Wettest five days (Rx5day)
1980	192.9 mm (7.6 in)
1981	152.4 mm (6.0 in)
1982	176.8 mm (7.0 in)
1983	113.0 mm (4.4 in)
1984	107.7 mm (4.2 in)
1985	348.2 mm (13.7 in)
1986	237.1 mm (9.3 in)
1987	201.0 mm (7.9 in)
1988	67.3 mm (2.6 in)
1989	208.3 mm (8.2 in)
1990	176.4 mm (6.9 in)
1991	83.4 mm (3.3 in)
1992	40.6 mm (1.6 in)
1993	59.3 mm (2.3 in)
1994	66.8 mm (2.6 in)
1995	124.3 mm (4.9 in)
1996	96.3 mm (3.8 in)
1997	160.0 mm (6.3 in)
1998	62.5 mm (2.5 in)
1999	70.2 mm (2.8 in)
2000	109.5 mm (4.3 in)
2001	134.6 mm (5.3 in)
2002	110.8 mm (4.4 in)
2003	180.6 mm (7.1 in)
2004	133.1 mm (5.2 in)
2005	193.6 mm (7.6 in)
2006	179.1 mm (7.1 in)
2007	57.4 mm (2.3 in)
2008	199.2 mm (7.8 in)
2009	80.8 mm (3.2 in)
2010	54.4 mm (2.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Mona Island 2, 1980 to 2010. The record is 61 days in 2005, marked on the chart; the median year is 20 days.

Longest dry spell (CDD) at Mona Island 2 by year
Year	Longest dry spell (CDD)
1980	26 days
1981	19 days
1982	20 days
1983	19 days
1984	32 days
1985	44 days
1986	19 days
1987	13 days
1988	18 days
1989	20 days
1990	21 days
1991	37 days
1992	21 days
1993	19 days
1994	16 days
1995	26 days
1996	25 days
1997	31 days
1998	30 days
1999	31 days
2000	25 days
2001	19 days
2002	13 days
2003	19 days
2004	16 days
2005	61 days
2006	13 days
2007	26 days
2008	16 days
2009	19 days
2010	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.

Download the Data

Data for Mona Island 2 standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Mona Island 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).