Guayama 1SW Weather Records (RQC00664193)

Record envelope, standing records and threshold days for Guayama 1SW (RQC00664193), PR, Puerto Rico [United States], with 116 years of record.

Key Facts for Guayama 1SW

Guayama 1SW (RQC00664193) is a weather station in PR, Puerto Rico [United States] at 17.98 latitude and -66.13 longitude, 42 m (136 ft) above sea level.
The station reports from 1911 to 2026, 116 years of record.
1,464 records set at Guayama 1SW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Guayama 1SW set a daily record precipitation of 97.8 mm (3.9 in) on 1 September 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

Location: PR, Puerto Rico [United States], 17.98 latitude, -66.13 longitude.
Elevation: 42 m (136 ft).
Period of record: 1911 to 2026, 116 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

10 days at or beyond a record

The band shows the record high and record low for each calendar day at Guayama 1SW. The lines show the 2026 daily maximum and minimum. 10 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Guayama 1SW, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	34.4 C (93.9 F)	15.6 C (60.1 F)	30.6 C (87.1 F)	18.9 C (66.0 F)
Feb	34.4 C (93.9 F)	15.6 C (60.1 F)	31.1 C (88.0 F)	19.4 C (66.9 F)
Mar	35.0 C (95.0 F)	16.1 C (61.0 F)	30.6 C (87.1 F)	18.9 C (66.0 F)
Apr	35.6 C (96.1 F)	15.6 C (60.1 F)	32.2 C (90.0 F)	19.4 C (66.9 F)
May	35.6 C (96.1 F)	16.7 C (62.1 F)	32.8 C (91.0 F)	21.7 C (71.1 F)
Jun	35.0 C (95.0 F)	17.8 C (64.0 F)	34.4 C (93.9 F)	22.2 C (72.0 F)
Jul	37.2 C (99.0 F)	18.3 C (64.9 F)	35.0 C (95.0 F)	23.3 C (73.9 F)
Aug	37.2 C (99.0 F)	19.4 C (66.9 F)	35.6 C (96.1 F)	23.3 C (73.9 F)
Sep	36.7 C (98.1 F)	18.3 C (64.9 F)	34.4 C (93.9 F)	21.7 C (71.1 F)
Oct	36.1 C (97.0 F)	17.2 C (63.0 F)	33.9 C (93.0 F)	22.8 C (73.0 F)
Nov	36.1 C (97.0 F)	16.7 C (62.1 F)	n/a	n/a
Dec	35.0 C (95.0 F)	16.7 C (62.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Guayama 1SW still stand. 1922 holds the most, with 102.

Standing records at Guayama 1SW by the year they were set
Year set	Standing records
1914	7
1915	11
1916	13
1917	20
1918	54
1919	27
1920	9
1921	17
1922	102
1923	20
1924	5
1925	8
1926	7
1927	5
1928	2
1929	13
1930	9
1931	7
1932	13
1933	4
1934	6
1935	44
1936	4
1937	14
1938	8
1939	1
1940	5
1941	12
1943	10
1944	36
1945	36
1946	50
1947	32
1948	20
1949	14
1950	20
1951	38
1952	35
1953	31
1954	45
1955	31
1956	21
1957	25
1958	26
1959	12
1960	31
1961	5
1962	10
1963	13
1964	9
1965	5
1966	5
1967	9
1968	10
1969	10
1970	9
1971	4
1972	5
1973	2
1974	5
1975	11
1976	14
1977	18
1978	4
1979	12
1980	10
1981	7
1982	1
1983	15
1984	7
1985	2
1986	3
1987	6
1988	7
1989	6
1990	10
1991	8
1992	8
1993	13
1994	1
1995	5
1996	3
1997	3
1998	6
1999	4
2000	12
2001	6
2002	5
2003	6
2004	7
2005	14
2006	2
2007	6
2008	9
2009	6
2010	13
2011	9
2012	2
2013	7
2014	3
2015	35
2016	12
2017	13
2018	4
2019	5
2020	16
2023	11
2024	6
2025	4
2026	6

All-Time Record Progression

6 new records

6 all-time records were set at Guayama 1SW between 31 January 1945 and 21 June 1993. Each dot is a new record.

When Guayama 1SW set new all-time records
Date	Kind	Detail
1945-01-31	Record high minimum temperature	Record high minimum temperature 29.4 C (84.9 F)
1951-07-07	Record high maximum temperature	Record high maximum temperature 37.2 C (99.0 F)
1958-07-21	Record daily precipitation	Record daily precipitation 236.2 mm (9.3 in)
1961-08-27	Record daily precipitation	Record daily precipitation 265.9 mm (10.5 in)
1979-09-05	Record daily precipitation	Record daily precipitation 315.0 mm (12.4 in)
1993-06-21	Record high minimum temperature	Record high minimum temperature 30.6 C (87.1 F)

Wettest Day of Each Month

Sep: 315.0 mm (12.4 in)

The wettest day on record for each calendar month at Guayama 1SW. The most was 315.0 mm (12.4 in) on 5 September 1979.

Record daily precipitation for each month at Guayama 1SW
Month	Record daily precipitation (mm)	Date
Jan	81.3 mm (3.2 in)	3 January 1937
Feb	86.1 mm (3.4 in)	7 February 1920
Mar	120.1 mm (4.7 in)	20 March 2003
Apr	177.3 mm (7.0 in)	27 April 1943
May	173.2 mm (6.8 in)	26 May 1992
Jun	131.3 mm (5.2 in)	16 June 1944
Jul	236.2 mm (9.3 in)	21 July 1958
Aug	265.9 mm (10.5 in)	27 August 1961
Sep	315.0 mm (12.4 in)	5 September 1979
Oct	238.8 mm (9.4 in)	6 October 1970
Nov	189.2 mm (7.4 in)	13 November 2003
Dec	130.6 mm (5.1 in)	3 December 1960

Period of Record Coverage

1914 to 2026

110 years of record at Guayama 1SW, 1914 to 2026. 27 years have data for under 90 percent of days and are left out of rankings: 1919, 1946, 1947, 1948, 1951, 1952, 1975, 1976 and others.

Days with data per year at Guayama 1SW
Year	Days with data	Share of year	Complete
1914	365	100%	Yes
1915	365	100%	Yes
1916	364	99%	Yes
1917	357	98%	Yes
1918	363	99%	Yes
1919	271	74%	No
1920	366	100%	Yes
1921	363	99%	Yes
1922	353	97%	Yes
1923	365	100%	Yes
1924	366	100%	Yes
1925	364	100%	Yes
1926	364	100%	Yes
1927	365	100%	Yes
1928	354	97%	Yes
1929	331	91%	Yes
1930	365	100%	Yes
1931	365	100%	Yes
1932	366	100%	Yes
1933	365	100%	Yes
1934	365	100%	Yes
1935	363	99%	Yes
1936	366	100%	Yes
1937	364	100%	Yes
1938	362	99%	Yes
1939	361	99%	Yes
1940	364	99%	Yes
1941	359	98%	Yes
1943	363	99%	Yes
1944	356	97%	Yes
1945	341	93%	Yes
1946	316	87%	No
1947	294	81%	No
1948	248	68%	No
1949	359	98%	Yes
1950	364	100%	Yes
1951	273	75%	No
1952	325	89%	No
1953	364	100%	Yes
1954	361	99%	Yes
1955	363	99%	Yes
1956	366	100%	Yes
1957	362	99%	Yes
1958	362	99%	Yes
1959	361	99%	Yes
1960	362	99%	Yes
1961	362	99%	Yes
1962	360	99%	Yes
1963	365	100%	Yes
1964	364	99%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	353	97%	Yes
1968	332	91%	Yes
1969	365	100%	Yes
1970	333	91%	Yes
1971	364	100%	Yes
1972	366	100%	Yes
1973	346	95%	Yes
1974	329	90%	Yes
1975	250	68%	No
1976	261	71%	No
1977	233	64%	No
1978	164	45%	No
1979	295	81%	No
1980	341	93%	Yes
1981	358	98%	Yes
1982	325	89%	No
1983	329	90%	Yes
1984	327	89%	No
1985	203	56%	No
1986	215	59%	No
1987	204	56%	No
1988	216	59%	No
1989	221	61%	No
1990	227	62%	No
1991	231	63%	No
1992	237	65%	No
1993	253	69%	No
1994	365	100%	Yes
1995	365	100%	Yes
1996	366	100%	Yes
1997	365	100%	Yes
1998	353	97%	Yes
1999	354	97%	Yes
2000	366	100%	Yes
2001	365	100%	Yes
2002	365	100%	Yes
2003	365	100%	Yes
2004	366	100%	Yes
2005	334	92%	Yes
2006	360	99%	Yes
2007	364	100%	Yes
2008	366	100%	Yes
2009	365	100%	Yes
2010	365	100%	Yes
2011	365	100%	Yes
2012	362	99%	Yes
2013	363	99%	Yes
2014	357	98%	Yes
2015	363	99%	Yes
2016	317	87%	No
2017	311	85%	No
2018	297	81%	No
2019	365	100%	Yes
2020	266	73%	No
2023	334	92%	Yes
2024	366	100%	Yes
2025	365	100%	Yes
2026	279	76%	No

Latest Records

Latest records at Guayama 1SW
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
1 September 2026	Guayama 1SW, PR	daily rain (Provisional)	97.8 mm (3.9 in)	30.2 mm (1.2 in)	93 years	51 of 100 (Notable)
16 August 2026	Guayama 1SW, PR	daily high max (Tie)	34.4 C (93.9 F)	tie	73 years	8 of 100 (Routine)
15 August 2026	Guayama 1SW, PR	daily high max (Tie)	35.6 C (96.1 F)	tie	17 years	3 of 100 (Routine)
15 August 2026	Guayama 1SW, PR	daily high min (Tie)	27.8 C (82.0 F)	tie	9 years	3 of 100 (Routine)
11 August 2026	Guayama 1SW, PR	daily high min	27.8 C (82.0 F)	0.6 C (1.1 F)	17 years	19 of 100 (Routine)
10 August 2026	Guayama 1SW, PR	daily high min	27.2 C (81.0 F)	0.5 C (0.9 F)	111 years	43 of 100 (Notable)
9 August 2026	Guayama 1SW, PR	daily high max (Tie)	34.4 C (93.9 F)	tie	75 years	8 of 100 (Routine)
22 July 2026	Guayama 1SW, PR	daily high max	35.0 C (95.0 F)	0.6 C (1.1 F)	80 years	38 of 100 (Notable)
20 July 2026	Guayama 1SW, PR	daily high max (Tie)	35.0 C (95.0 F)	tie	63 years	7 of 100 (Routine)
13 July 2026	Guayama 1SW, PR	daily high max (Tie)	34.4 C (93.9 F)	tie	71 years	7 of 100 (Routine)
12 July 2026	Guayama 1SW, PR	daily high max (Tie)	33.9 C (93.0 F)	tie	77 years	8 of 100 (Routine)
24 June 2026	Guayama 1SW, PR	daily high max (Tie)	34.4 C (93.9 F)	tie	3 years	2 of 100 (Routine)
20 June 2026	Guayama 1SW, PR	daily high max	33.9 C (93.0 F)	0.6 C (1.1 F)	101 years	44 of 100 (Notable)
19 June 2026	Guayama 1SW, PR	daily high max (Tie)	33.9 C (93.0 F)	tie	65 years	7 of 100 (Routine)
11 February 2026	Guayama 1SW, PR	daily low max	25.6 C (78.1 F)	1.1 C (2.0 F)	104 years	48 of 100 (Notable)
1 February 2026	Guayama 1SW, PR	daily rain	27.2 mm (1.1 in)	6.6 mm (0.26 in)	76 years	40 of 100 (Notable)
21 January 2026	Guayama 1SW, PR	daily high min	24.4 C (75.9 F)	0.5 C (0.9 F)	107 years	43 of 100 (Notable)
28 December 2025	Guayama 1SW, PR	daily low min (Tie)	17.8 C (64.0 F)	tie	108 years	10 of 100 (Routine)
30 November 2025	Guayama 1SW, PR	daily high min (Tie)	25.0 C (77.0 F)	tie	19 years	3 of 100 (Routine)
22 November 2025	Guayama 1SW, PR	daily low min (Tie)	20.6 C (69.1 F)	tie	80 years	8 of 100 (Routine)

Climate Trend

72 complete years, 1914 to 2025

One stripe for each of 72 complete years at Guayama 1SW, 1914 to 2025. Blue stripes are years cooler than the station's own mean of 27.1 C (80.8 F); red stripes are warmer. The coolest year was 1922, at 25.1 C (77.3 F), and the warmest was 2015, at 28.2 C (82.7 F). The strongest colour marks a difference of 2.0 C (3.6 F).

Annual mean temperature at Guayama 1SW as warming stripes, 1914 to 2025
Year	Annual mean temperature	Difference from the station mean
1914	26.7 C	-0.37 C
1915	27.2 C	+0.05 C
1916	26.5 C	-0.65 C
1917	26.1 C	-1.01 C
1918	25.6 C	-1.56 C
1920	26.2 C	-0.87 C
1921	26.2 C	-0.96 C
1922	25.1 C	-1.97 C
1923	26.1 C	-1.03 C
1926	26.9 C	-0.23 C
1927	26.8 C	-0.28 C
1928	26.8 C	-0.30 C
1930	27.1 C	-0.04 C
1931	27.3 C	+0.17 C
1932	27.2 C	+0.10 C
1933	27.0 C	-0.12 C
1934	27.0 C	-0.10 C
1936	27.2 C	+0.04 C
1937	27.2 C	+0.10 C
1938	26.7 C	-0.44 C
1939	26.5 C	-0.59 C
1940	26.7 C	-0.45 C
1941	27.4 C	+0.33 C
1943	27.0 C	-0.10 C
1944	27.3 C	+0.15 C
1945	27.3 C	+0.20 C
1946	27.3 C	+0.20 C
1949	27.2 C	+0.07 C
1950	27.0 C	-0.16 C
1953	27.6 C	+0.52 C
1954	27.3 C	+0.14 C
1955	27.5 C	+0.35 C
1956	27.0 C	-0.09 C
1957	27.5 C	+0.34 C
1958	27.6 C	+0.44 C
1959	27.7 C	+0.61 C
1960	27.8 C	+0.73 C
1961	27.6 C	+0.44 C
1962	27.4 C	+0.31 C
1963	27.7 C	+0.63 C
1964	27.6 C	+0.46 C
1965	27.4 C	+0.25 C
1966	27.6 C	+0.44 C
1969	27.1 C	-0.02 C
1971	26.6 C	-0.53 C
1972	26.7 C	-0.44 C
1980	27.7 C	+0.59 C
1981	27.5 C	+0.36 C
1994	26.9 C	-0.22 C
1995	27.2 C	+0.06 C
1996	26.8 C	-0.35 C
1997	27.1 C	+0.02 C
1998	27.3 C	+0.17 C
1999	26.9 C	-0.21 C
2000	27.2 C	+0.04 C
2001	27.2 C	+0.07 C
2002	27.4 C	+0.24 C
2003	27.3 C	+0.19 C
2004	27.1 C	-0.03 C
2006	27.3 C	+0.18 C
2007	27.4 C	+0.28 C
2008	27.0 C	-0.15 C
2009	27.4 C	+0.25 C
2010	27.7 C	+0.56 C
2011	27.3 C	+0.16 C
2012	27.5 C	+0.43 C
2013	27.5 C	+0.34 C
2014	27.6 C	+0.44 C
2015	28.2 C	+1.07 C
2019	27.6 C	+0.51 C
2024	27.4 C	+0.29 C
2025	27.1 C	+0.02 C

The annual mean temperature here has risen by 0.08 C (0.05 to 0.11) per decade over 1914 to 2025. In Fahrenheit: 0.1 F (0.1 to 0.2) per decade. The slope is a straight line fitted to 72 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Guayama 1SW
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.08 C (0.05 to 0.11) per decade	0.1 F (0.1 to 0.2) per decade	1914 to 2025	72	Rise
Mean daily maximum	0.04 C (-0.02 to 0.10) per decade	0.07 F (-0.04 to 0.17) per decade	1914 to 2025	72	Not clearly different from zero
Mean daily minimum	0.1 C (0.1 to 0.1) per decade	0.2 F (0.2 to 0.3) per decade	1914 to 2025	72	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

1911 to 2026

Yearly extremes at Guayama 1SW: 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)	1951	34.7 C (94.5 F)	110
Coldest night (TNn)	15.6 C (60.1 F)	1930	18.3 C (64.9 F)	110
Wettest day (Rx1day)	315.0 mm (12.4 in)	1979	95.5 mm (3.8 in)	113
Wettest five days (Rx5day)	592.8 mm (23.3 in)	1970	158.3 mm (6.2 in)	113
Longest dry spell (CDD)	50 days	1951	18 days	113

Hottest day (TXx)

The hottest day of the year at Guayama 1SW, 1911 to 2026. The record is 37.2 C (99.0 F) in 1951, marked on the chart; the median year is 34.7 C (94.5 F).

Hottest day (TXx) at Guayama 1SW by year
Year	Hottest day (TXx)
1911	n/a
1912	n/a
1913	n/a
1914	34.4 C (93.9 F)
1915	34.4 C (93.9 F)
1916	32.8 C (91.0 F)
1917	33.3 C (91.9 F)
1918	33.3 C (91.9 F)
1919	34.4 C (93.9 F)
1920	33.9 C (93.0 F)
1921	34.4 C (93.9 F)
1922	31.7 C (89.1 F)
1923	33.9 C (93.0 F)
1924	33.3 C (91.9 F)
1925	33.9 C (93.0 F)
1926	36.1 C (97.0 F)
1927	34.4 C (93.9 F)
1928	34.4 C (93.9 F)
1929	33.9 C (93.0 F)
1930	35.0 C (95.0 F)
1931	35.6 C (96.1 F)
1932	33.9 C (93.0 F)
1933	34.4 C (93.9 F)
1934	35.0 C (95.0 F)
1935	33.9 C (93.0 F)
1936	35.0 C (95.0 F)
1937	36.1 C (97.0 F)
1938	34.4 C (93.9 F)
1939	33.9 C (93.0 F)
1940	34.4 C (93.9 F)
1941	34.4 C (93.9 F)
1943	36.1 C (97.0 F)
1944	36.7 C (98.1 F)
1945	35.6 C (96.1 F)
1946	35.6 C (96.1 F)
1947	36.1 C (97.0 F)
1948	35.0 C (95.0 F)
1949	35.6 C (96.1 F)
1950	36.1 C (97.0 F)
1951	37.2 C (99.0 F)
1952	35.6 C (96.1 F)
1953	36.1 C (97.0 F)
1954	36.1 C (97.0 F)
1955	35.6 C (96.1 F)
1956	35.0 C (95.0 F)
1957	35.0 C (95.0 F)
1958	35.0 C (95.0 F)
1959	35.6 C (96.1 F)
1960	36.1 C (97.0 F)
1961	35.6 C (96.1 F)
1962	35.6 C (96.1 F)
1963	35.6 C (96.1 F)
1964	35.6 C (96.1 F)
1965	35.6 C (96.1 F)
1966	35.0 C (95.0 F)
1967	35.6 C (96.1 F)
1968	35.0 C (95.0 F)
1969	33.9 C (93.0 F)
1970	34.4 C (93.9 F)
1971	34.4 C (93.9 F)
1972	33.9 C (93.0 F)
1973	33.3 C (91.9 F)
1974	35.6 C (96.1 F)
1975	35.6 C (96.1 F)
1976	35.0 C (95.0 F)
1977	34.4 C (93.9 F)
1978	37.2 C (99.0 F)
1979	35.0 C (95.0 F)
1980	35.6 C (96.1 F)
1981	35.0 C (95.0 F)
1982	33.9 C (93.0 F)
1983	34.4 C (93.9 F)
1984	34.4 C (93.9 F)
1985	35.6 C (96.1 F)
1986	33.9 C (93.0 F)
1987	35.6 C (96.1 F)
1988	34.4 C (93.9 F)
1989	34.4 C (93.9 F)
1990	33.9 C (93.0 F)
1991	35.0 C (95.0 F)
1992	34.4 C (93.9 F)
1993	35.6 C (96.1 F)
1994	34.4 C (93.9 F)
1995	35.6 C (96.1 F)
1996	34.4 C (93.9 F)
1997	35.6 C (96.1 F)
1998	33.9 C (93.0 F)
1999	33.3 C (91.9 F)
2000	33.9 C (93.0 F)
2001	33.3 C (91.9 F)
2002	34.4 C (93.9 F)
2003	33.3 C (91.9 F)
2004	33.9 C (93.0 F)
2005	33.9 C (93.0 F)
2006	33.9 C (93.0 F)
2007	35.0 C (95.0 F)
2008	35.6 C (96.1 F)
2009	34.4 C (93.9 F)
2010	35.6 C (96.1 F)
2011	34.4 C (93.9 F)
2012	34.4 C (93.9 F)
2013	35.0 C (95.0 F)
2014	34.4 C (93.9 F)
2015	34.4 C (93.9 F)
2016	34.4 C (93.9 F)
2017	35.6 C (96.1 F)
2018	33.3 C (91.9 F)
2019	35.6 C (96.1 F)
2020	35.6 C (96.1 F)
2023	36.1 C (97.0 F)
2024	34.4 C (93.9 F)
2025	35.6 C (96.1 F)
2026	35.6 C (96.1 F)

Coldest night (TNn)

The coldest night of the year at Guayama 1SW, 1911 to 2026. The record is 15.6 C (60.1 F) in 1930, marked on the chart; the median year is 18.3 C (64.9 F).

Coldest night (TNn) at Guayama 1SW by year
Year	Coldest night (TNn)
1911	n/a
1912	n/a
1913	n/a
1914	16.7 C (62.1 F)
1915	17.8 C (64.0 F)
1916	18.3 C (64.9 F)
1917	16.7 C (62.1 F)
1918	16.7 C (62.1 F)
1919	17.8 C (64.0 F)
1920	18.9 C (66.0 F)
1921	18.3 C (64.9 F)
1922	17.8 C (64.0 F)
1923	17.8 C (64.0 F)
1924	18.3 C (64.9 F)
1925	18.3 C (64.9 F)
1926	17.8 C (64.0 F)
1927	18.9 C (66.0 F)
1928	18.9 C (66.0 F)
1929	18.9 C (66.0 F)
1930	15.6 C (60.1 F)
1931	20.0 C (68.0 F)
1932	18.3 C (64.9 F)
1933	19.4 C (66.9 F)
1934	19.4 C (66.9 F)
1935	16.7 C (62.1 F)
1936	19.4 C (66.9 F)
1937	15.6 C (60.1 F)
1938	18.3 C (64.9 F)
1939	19.4 C (66.9 F)
1940	18.3 C (64.9 F)
1941	20.0 C (68.0 F)
1943	16.7 C (62.1 F)
1944	16.7 C (62.1 F)
1945	17.2 C (63.0 F)
1946	17.8 C (64.0 F)
1947	19.4 C (66.9 F)
1948	18.9 C (66.0 F)
1949	18.3 C (64.9 F)
1950	17.8 C (64.0 F)
1951	15.6 C (60.1 F)
1952	19.4 C (66.9 F)
1953	18.9 C (66.0 F)
1954	17.2 C (63.0 F)
1955	17.8 C (64.0 F)
1956	17.2 C (63.0 F)
1957	17.2 C (63.0 F)
1958	16.7 C (62.1 F)
1959	19.4 C (66.9 F)
1960	19.4 C (66.9 F)
1961	18.3 C (64.9 F)
1962	17.2 C (63.0 F)
1963	18.9 C (66.0 F)
1964	18.3 C (64.9 F)
1965	18.3 C (64.9 F)
1966	19.4 C (66.9 F)
1967	16.1 C (61.0 F)
1968	17.8 C (64.0 F)
1969	17.8 C (64.0 F)
1970	17.8 C (64.0 F)
1971	17.8 C (64.0 F)
1972	18.3 C (64.9 F)
1973	20.0 C (68.0 F)
1974	15.6 C (60.1 F)
1975	15.6 C (60.1 F)
1976	18.3 C (64.9 F)
1977	18.9 C (66.0 F)
1978	21.1 C (70.0 F)
1979	16.1 C (61.0 F)
1980	18.9 C (66.0 F)
1981	20.0 C (68.0 F)
1982	20.0 C (68.0 F)
1983	20.6 C (69.1 F)
1984	19.4 C (66.9 F)
1985	18.9 C (66.0 F)
1986	18.9 C (66.0 F)
1987	19.4 C (66.9 F)
1988	18.9 C (66.0 F)
1989	16.1 C (61.0 F)
1990	18.3 C (64.9 F)
1991	17.8 C (64.0 F)
1992	20.6 C (69.1 F)
1993	19.4 C (66.9 F)
1994	19.4 C (66.9 F)
1995	18.9 C (66.0 F)
1996	18.9 C (66.0 F)
1997	19.4 C (66.9 F)
1998	19.4 C (66.9 F)
1999	16.7 C (62.1 F)
2000	16.1 C (61.0 F)
2001	17.8 C (64.0 F)
2002	18.3 C (64.9 F)
2003	20.0 C (68.0 F)
2004	18.3 C (64.9 F)
2005	16.7 C (62.1 F)
2006	18.3 C (64.9 F)
2007	18.3 C (64.9 F)
2008	17.8 C (64.0 F)
2009	18.3 C (64.9 F)
2010	16.7 C (62.1 F)
2011	18.9 C (66.0 F)
2012	18.3 C (64.9 F)
2013	17.8 C (64.0 F)
2014	18.3 C (64.9 F)
2015	19.4 C (66.9 F)
2016	20.0 C (68.0 F)
2017	17.8 C (64.0 F)
2018	19.4 C (66.9 F)
2019	18.9 C (66.0 F)
2020	19.4 C (66.9 F)
2023	16.7 C (62.1 F)
2024	17.2 C (63.0 F)
2025	17.8 C (64.0 F)
2026	18.9 C (66.0 F)

Wettest day (Rx1day)

The wettest day of the year at Guayama 1SW, 1911 to 2026. The record is 315.0 mm (12.4 in) in 1979, marked on the chart; the median year is 95.5 mm (3.8 in).

Wettest day (Rx1day) at Guayama 1SW by year
Year	Wettest day (Rx1day)
1911	104.4 mm (4.1 in)
1912	186.4 mm (7.3 in)
1913	87.4 mm (3.4 in)
1914	48.3 mm (1.9 in)
1915	102.1 mm (4.0 in)
1916	85.6 mm (3.4 in)
1917	103.6 mm (4.1 in)
1918	135.1 mm (5.3 in)
1919	94.7 mm (3.7 in)
1920	86.1 mm (3.4 in)
1921	53.8 mm (2.1 in)
1922	55.1 mm (2.2 in)
1923	62.7 mm (2.5 in)
1924	116.8 mm (4.6 in)
1925	52.8 mm (2.1 in)
1926	96.5 mm (3.8 in)
1927	72.6 mm (2.9 in)
1928	217.2 mm (8.6 in)
1929	78.7 mm (3.1 in)
1930	45.0 mm (1.8 in)
1931	71.1 mm (2.8 in)
1932	100.8 mm (4.0 in)
1933	71.6 mm (2.8 in)
1934	60.2 mm (2.4 in)
1935	77.5 mm (3.1 in)
1936	125.2 mm (4.9 in)
1937	153.7 mm (6.1 in)
1938	142.0 mm (5.6 in)
1939	62.2 mm (2.4 in)
1940	91.9 mm (3.6 in)
1941	69.9 mm (2.8 in)
1943	177.3 mm (7.0 in)
1944	148.8 mm (5.9 in)
1945	183.9 mm (7.2 in)
1946	82.3 mm (3.2 in)
1947	74.9 mm (2.9 in)
1948	141.5 mm (5.6 in)
1949	104.6 mm (4.1 in)
1950	187.5 mm (7.4 in)
1951	73.7 mm (2.9 in)
1952	95.8 mm (3.8 in)
1953	210.8 mm (8.3 in)
1954	88.1 mm (3.5 in)
1955	81.8 mm (3.2 in)
1956	97.5 mm (3.8 in)
1957	91.2 mm (3.6 in)
1958	236.2 mm (9.3 in)
1959	84.6 mm (3.3 in)
1960	130.6 mm (5.1 in)
1961	265.9 mm (10.5 in)
1962	92.2 mm (3.6 in)
1963	67.8 mm (2.7 in)
1964	86.4 mm (3.4 in)
1965	124.2 mm (4.9 in)
1966	54.6 mm (2.1 in)
1967	40.6 mm (1.6 in)
1968	53.8 mm (2.1 in)
1969	99.1 mm (3.9 in)
1970	238.8 mm (9.4 in)
1971	78.5 mm (3.1 in)
1972	134.6 mm (5.3 in)
1973	219.2 mm (8.6 in)
1974	125.7 mm (4.9 in)
1975	248.4 mm (9.8 in)
1976	36.6 mm (1.4 in)
1977	101.6 mm (4.0 in)
1978	119.4 mm (4.7 in)
1979	315.0 mm (12.4 in)
1980	86.4 mm (3.4 in)
1981	62.2 mm (2.4 in)
1982	107.4 mm (4.2 in)
1983	88.9 mm (3.5 in)
1984	86.4 mm (3.4 in)
1985	88.9 mm (3.5 in)
1986	74.9 mm (2.9 in)
1987	95.5 mm (3.8 in)
1988	103.4 mm (4.1 in)
1989	104.6 mm (4.1 in)
1990	103.6 mm (4.1 in)
1991	78.7 mm (3.1 in)
1992	173.2 mm (6.8 in)
1993	53.3 mm (2.1 in)
1994	96.5 mm (3.8 in)
1995	66.8 mm (2.6 in)
1996	217.4 mm (8.6 in)
1997	147.6 mm (5.8 in)
1998	130.8 mm (5.1 in)
1999	144.8 mm (5.7 in)
2000	86.4 mm (3.4 in)
2001	194.1 mm (7.6 in)
2002	122.4 mm (4.8 in)
2003	189.2 mm (7.4 in)
2004	149.1 mm (5.9 in)
2005	132.3 mm (5.2 in)
2006	90.2 mm (3.6 in)
2007	104.6 mm (4.1 in)
2008	114.6 mm (4.5 in)
2009	69.3 mm (2.7 in)
2010	110.2 mm (4.3 in)
2011	111.5 mm (4.4 in)
2012	75.7 mm (3.0 in)
2013	58.4 mm (2.3 in)
2014	126.0 mm (5.0 in)
2015	68.1 mm (2.7 in)
2016	95.5 mm (3.8 in)
2017	249.7 mm (9.8 in)
2018	56.9 mm (2.2 in)
2019	83.1 mm (3.3 in)
2020	70.6 mm (2.8 in)
2023	84.3 mm (3.3 in)
2024	74.4 mm (2.9 in)
2025	45.7 mm (1.8 in)
2026	97.8 mm (3.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Guayama 1SW, 1911 to 2026. The record is 592.8 mm (23.3 in) in 1970, marked on the chart; the median year is 158.3 mm (6.2 in).

Wettest five days (Rx5day) at Guayama 1SW by year
Year	Wettest five days (Rx5day)
1911	128.5 mm (5.1 in)
1912	261.0 mm (10.3 in)
1913	141.5 mm (5.6 in)
1914	81.6 mm (3.2 in)
1915	340.1 mm (13.4 in)
1916	266.5 mm (10.5 in)
1917	110.2 mm (4.3 in)
1918	167.1 mm (6.6 in)
1919	131.5 mm (5.2 in)
1920	210.1 mm (8.3 in)
1921	87.5 mm (3.4 in)
1922	95.2 mm (3.7 in)
1923	135.6 mm (5.3 in)
1924	288.3 mm (11.4 in)
1925	78.8 mm (3.1 in)
1926	105.1 mm (4.1 in)
1927	179.3 mm (7.1 in)
1928	319.6 mm (12.6 in)
1929	106.6 mm (4.2 in)
1930	98.9 mm (3.9 in)
1931	228.1 mm (9.0 in)
1932	197.1 mm (7.8 in)
1933	197.1 mm (7.8 in)
1934	159.8 mm (6.3 in)
1935	167.5 mm (6.6 in)
1936	207.5 mm (8.2 in)
1937	204.2 mm (8.0 in)
1938	404.5 mm (15.9 in)
1939	101.5 mm (4.0 in)
1940	183.4 mm (7.2 in)
1941	140.3 mm (5.5 in)
1943	314.0 mm (12.4 in)
1944	342.0 mm (13.5 in)
1945	200.4 mm (7.9 in)
1946	126.8 mm (5.0 in)
1947	118.4 mm (4.7 in)
1948	216.0 mm (8.5 in)
1949	227.6 mm (9.0 in)
1950	207.0 mm (8.1 in)
1951	118.9 mm (4.7 in)
1952	201.1 mm (7.9 in)
1953	257.0 mm (10.1 in)
1954	305.6 mm (12.0 in)
1955	110.0 mm (4.3 in)
1956	130.0 mm (5.1 in)
1957	113.0 mm (4.4 in)
1958	287.8 mm (11.3 in)
1959	95.8 mm (3.8 in)
1960	381.1 mm (15.0 in)
1961	320.3 mm (12.6 in)
1962	139.7 mm (5.5 in)
1963	102.9 mm (4.1 in)
1964	121.2 mm (4.8 in)
1965	146.6 mm (5.8 in)
1966	79.7 mm (3.1 in)
1967	43.0 mm (1.7 in)
1968	135.6 mm (5.3 in)
1969	167.4 mm (6.6 in)
1970	592.8 mm (23.3 in)
1971	165.1 mm (6.5 in)
1972	158.3 mm (6.2 in)
1973	265.4 mm (10.4 in)
1974	113.7 mm (4.5 in)
1975	316.2 mm (12.4 in)
1976	50.6 mm (2.0 in)
1977	143.0 mm (5.6 in)
1978	55.9 mm (2.2 in)
1979	374.2 mm (14.7 in)
1980	92.3 mm (3.6 in)
1981	171.5 mm (6.8 in)
1982	164.0 mm (6.5 in)
1983	175.2 mm (6.9 in)
1984	274.5 mm (10.8 in)
1985	110.0 mm (4.3 in)
1986	66.0 mm (2.6 in)
1987	129.0 mm (5.1 in)
1988	134.7 mm (5.3 in)
1989	198.3 mm (7.8 in)
1990	82.5 mm (3.2 in)
1991	115.6 mm (4.6 in)
1992	22.9 mm (0.9 in)
1993	54.8 mm (2.2 in)
1994	144.9 mm (5.7 in)
1995	111.3 mm (4.4 in)
1996	342.9 mm (13.5 in)
1997	205.5 mm (8.1 in)
1998	182.6 mm (7.2 in)
1999	341.7 mm (13.5 in)
2000	143.8 mm (5.7 in)
2001	208.1 mm (8.2 in)
2002	207.1 mm (8.2 in)
2003	381.3 mm (15.0 in)
2004	255.0 mm (10.0 in)
2005	208.8 mm (8.2 in)
2006	112.3 mm (4.4 in)
2007	333.9 mm (13.1 in)
2008	176.7 mm (7.0 in)
2009	96.5 mm (3.8 in)
2010	207.8 mm (8.2 in)
2011	253.6 mm (10.0 in)
2012	105.7 mm (4.2 in)
2013	168.9 mm (6.6 in)
2014	202.3 mm (8.0 in)
2015	90.4 mm (3.6 in)
2016	139.7 mm (5.5 in)
2017	275.4 mm (10.8 in)
2018	101.5 mm (4.0 in)
2019	147.8 mm (5.8 in)
2020	92.4 mm (3.6 in)
2023	144.3 mm (5.7 in)
2024	126.0 mm (5.0 in)
2025	46.2 mm (1.8 in)
2026	118.4 mm (4.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Guayama 1SW, 1911 to 2026. The record is 50 days in 1951, marked on the chart; the median year is 18 days.

Longest dry spell (CDD) at Guayama 1SW by year
Year	Longest dry spell (CDD)
1911	19 days
1912	16 days
1913	19 days
1914	12 days
1915	28 days
1916	34 days
1917	16 days
1918	18 days
1919	25 days
1920	33 days
1921	20 days
1922	17 days
1923	18 days
1924	16 days
1925	21 days
1926	14 days
1927	31 days
1928	21 days
1929	15 days
1930	11 days
1931	18 days
1932	32 days
1933	24 days
1934	17 days
1935	16 days
1936	23 days
1937	21 days
1938	25 days
1939	18 days
1940	12 days
1941	14 days
1943	14 days
1944	25 days
1945	16 days
1946	14 days
1947	14 days
1948	17 days
1949	26 days
1950	16 days
1951	50 days
1952	23 days
1953	16 days
1954	17 days
1955	19 days
1956	21 days
1957	14 days
1958	29 days
1959	29 days
1960	10 days
1961	13 days
1962	21 days
1963	19 days
1964	16 days
1965	16 days
1966	22 days
1967	18 days
1968	47 days
1969	25 days
1970	25 days
1971	17 days
1972	11 days
1973	18 days
1974	13 days
1975	20 days
1976	22 days
1977	15 days
1978	18 days
1979	27 days
1980	26 days
1981	19 days
1982	12 days
1983	34 days
1984	19 days
1985	23 days
1986	19 days
1987	14 days
1988	15 days
1989	37 days
1990	26 days
1991	16 days
1992	23 days
1993	14 days
1994	20 days
1995	25 days
1996	12 days
1997	18 days
1998	15 days
1999	37 days
2000	20 days
2001	18 days
2002	17 days
2003	15 days
2004	21 days
2005	18 days
2006	11 days
2007	20 days
2008	18 days
2009	12 days
2010	20 days
2011	21 days
2012	22 days
2013	10 days
2014	17 days
2015	15 days
2016	9 days
2017	20 days
2018	20 days
2019	14 days
2020	13 days
2023	12 days
2024	18 days
2025	9 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

89 years, 1911 to 2024

A day with at least 98.6 mm (3.9 in) of rain is expected about once in 2 years. A day with at least 314.6 mm (12.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Guayama 1SW: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	98.6 mm (3.9 in)
5 years	143.7 mm (5.7 in)
10 years	178.1 mm (7.0 in)
25 years	227.5 mm (9.0 in)
50 years	268.9 mm (10.6 in)
100 years	314.6 mm (12.4 in)	Longer than the 89 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, 89 years of values from 1911 to 2024.

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: 265.9 mm (10.5 in) in 1961; 249.7 mm (9.8 in) in 2017; 238.8 mm (9.4 in) in 1970.

Download the Data

Data for Guayama 1SW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Guayama 1SW 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-16. Last revised 16 October 2026 (2026-10-16).