Patuxent River NAS Weather Records (USW00013721)

Record envelope, standing records and threshold days for Patuxent River NAS (USW00013721), Maryland, United States, with 82 years of record.

Key Facts for Patuxent River NAS

Patuxent River NAS (USW00013721) is a weather station in Maryland, United States at 38.30 latitude and -76.42 longitude, 12 m (39 ft) above sea level.
The station reports from 1945 to 2026, 82 years of record.
1,464 records set at Patuxent River NAS still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Patuxent River NAS set a daily record precipitation of 41.4 mm (1.6 in) on 4 September 2026 (provisional).

Provisional Records

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

About the Station

Location: Maryland, United States, 38.30 latitude, -76.42 longitude.
Elevation: 12 m (39 ft).
Period of record: 1945 to 2026, 82 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

5 days at or beyond a record

The band shows the record high and record low for each calendar day at Patuxent River NAS. The lines show the 2026 daily maximum and minimum. 5 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Patuxent River NAS, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	27.8 C (82.0 F)	-19.4 C (-2.9 F)	17.2 C (63.0 F)	-13.3 C (8.1 F)
Feb	27.2 C (81.0 F)	-18.8 C (-1.8 F)	15.0 C (59.0 F)	-10.0 C (14.0 F)
Mar	31.1 C (88.0 F)	-12.7 C (9.1 F)	30.0 C (86.0 F)	-2.2 C (28.0 F)
Apr	33.9 C (93.0 F)	-3.8 C (25.2 F)	31.1 C (88.0 F)	1.1 C (34.0 F)
May	37.8 C (100.0 F)	2.2 C (36.0 F)	33.9 C (93.0 F)	6.7 C (44.1 F)
Jun	40.0 C (104.0 F)	6.7 C (44.1 F)	37.2 C (99.0 F)	12.8 C (55.0 F)
Jul	40.0 C (104.0 F)	12.2 C (54.0 F)	37.8 C (100.0 F)	17.8 C (64.0 F)
Aug	39.4 C (102.9 F)	11.1 C (52.0 F)	33.3 C (91.9 F)	16.7 C (62.1 F)
Sep	37.2 C (99.0 F)	6.7 C (44.1 F)	33.3 C (91.9 F)	14.4 C (57.9 F)
Oct	37.8 C (100.0 F)	-1.1 C (30.0 F)	30.0 C (86.0 F)	6.7 C (44.1 F)
Nov	29.4 C (84.9 F)	-8.9 C (16.0 F)	n/a	n/a
Dec	27.2 C (81.0 F)	-14.4 C (6.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Patuxent River NAS still stand. 1989 holds the most, with 35.

Standing records at Patuxent River NAS by the year they were set
Year set	Standing records
1945	20
1946	15
1947	20
1948	15
1949	18
1950	29
1951	23
1952	10
1953	16
1954	18
1955	12
1956	20
1957	12
1958	21
1959	19
1960	20
1961	15
1962	9
1963	31
1964	28
1965	19
1966	22
1967	29
1968	21
1969	10
1970	19
1971	18
1972	17
1973	9
1974	22
1975	7
1976	19
1977	21
1978	10
1979	29
1980	18
1981	9
1982	13
1983	26
1984	18
1985	28
1986	21
1987	10
1988	18
1989	35
1990	23
1991	23
1992	8
1993	16
1994	10
1995	7
1996	13
1997	35
1998	16
2000	2
2001	18
2002	22
2003	11
2004	13
2005	13
2006	9
2007	22
2008	18
2009	17
2010	24
2011	16
2012	16
2013	20
2014	27
2015	31
2016	17
2017	23
2018	33
2019	12
2020	15
2021	14
2022	18
2023	13
2024	30
2025	12
2026	8

All-Time Record Progression

10 new records

10 all-time records were set at Patuxent River NAS between 19 February 1979 and 30 September 2010. Each dot is a new record.

When Patuxent River NAS set new all-time records
Date	Kind	Detail
1979-02-19	Record daily snowfall	Record daily snowfall 29.7 cm (11.7 in)
1980-07-17	Record high maximum temperature	Record high maximum temperature 39.4 C (102.9 F)
1983-02-11	Record daily snowfall	Record daily snowfall 36.1 cm (14.2 in)
1983-06-20	Record daily precipitation	Record daily precipitation 150.1 mm (5.9 in)
1994-01-19	Record low maximum temperature	Record low maximum temperature -12.2 C (10.0 F)
1995-07-15	Record high minimum temperature	Record high minimum temperature 27.8 C (82.0 F)
1996-01-07	Record daily snowfall	Record daily snowfall 44.7 cm (17.6 in)
2005-08-12	Record high minimum temperature	Record high minimum temperature 29.4 C (84.9 F)
2010-07-25	Record high maximum temperature	Record high maximum temperature 40.0 C (104.0 F)
2010-09-30	Record daily precipitation	Record daily precipitation 298.7 mm (11.8 in)

Wettest Day of Each Month

Sep: 298.7 mm (11.8 in)

The wettest day on record for each calendar month at Patuxent River NAS. The most was 298.7 mm (11.8 in) on 30 September 2010.

Record daily precipitation for each month at Patuxent River NAS
Month	Record daily precipitation (mm)	Date
Jan	67.1 mm (2.6 in)	28 January 1998
Feb	90.4 mm (3.6 in)	4 February 1998
Mar	92.2 mm (3.6 in)	2 March 1994
Apr	121.7 mm (4.8 in)	30 April 1996
May	109.5 mm (4.3 in)	29 May 1984
Jun	150.1 mm (5.9 in)	20 June 1983
Jul	117.1 mm (4.6 in)	30 July 1960
Aug	203.2 mm (8.0 in)	27 August 2011
Sep	298.7 mm (11.8 in)	30 September 2010
Oct	153.2 mm (6.0 in)	29 October 2012
Nov	107.2 mm (4.2 in)	2 November 1956
Dec	80.8 mm (3.2 in)	24 December 1986

Period of Record Coverage

1945 to 2026

81 years of record at Patuxent River NAS, 1945 to 2026. 6 years have data for under 90 percent of days and are left out of rankings: 1945, 2000, 2006, 2020, 2021, 2026.

Days with data per year at Patuxent River NAS
Year	Days with data	Share of year	Complete
1945	302	83%	No
1946	362	99%	Yes
1947	363	99%	Yes
1948	364	99%	Yes
1949	364	100%	Yes
1950	361	99%	Yes
1951	361	99%	Yes
1952	363	99%	Yes
1953	364	100%	Yes
1954	364	100%	Yes
1955	364	100%	Yes
1956	365	100%	Yes
1957	363	99%	Yes
1958	364	100%	Yes
1959	365	100%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	365	100%	Yes
1969	365	100%	Yes
1970	355	97%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	365	100%	Yes
1983	365	100%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	365	100%	Yes
1987	365	100%	Yes
1988	366	100%	Yes
1989	365	100%	Yes
1990	365	100%	Yes
1991	365	100%	Yes
1992	365	100%	Yes
1993	365	100%	Yes
1994	365	100%	Yes
1995	365	100%	Yes
1996	364	99%	Yes
1997	365	100%	Yes
1998	364	100%	Yes
2000	31	8%	No
2001	365	100%	Yes
2002	362	99%	Yes
2003	363	99%	Yes
2004	361	99%	Yes
2005	362	99%	Yes
2006	163	45%	No
2007	352	96%	Yes
2008	344	94%	Yes
2009	361	99%	Yes
2010	363	99%	Yes
2011	365	100%	Yes
2012	365	100%	Yes
2013	364	100%	Yes
2014	364	100%	Yes
2015	363	99%	Yes
2016	365	100%	Yes
2017	362	99%	Yes
2018	361	99%	Yes
2019	358	98%	Yes
2020	307	84%	No
2021	324	89%	No
2022	364	100%	Yes
2023	364	100%	Yes
2024	364	99%	Yes
2025	335	92%	Yes
2026	261	72%	No

Latest Records

Latest records at Patuxent River NAS
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
4 September 2026	Patuxent River NAS, US	daily rain (Provisional)	41.4 mm (1.6 in)	28.2 mm (1.1 in)	23 years	28 of 100 (Routine)
22 August 2026	Patuxent River NAS, US	daily rain (Provisional)	51.3 mm (2.0 in)	4.1 mm (0.16 in)	16 years	15 of 100 (Routine)
7 July 2026	Patuxent River NAS, US	daily rain	30.0 mm (1.2 in)	13.5 mm (0.5 in)	20 years	22 of 100 (Routine)
3 July 2026	Patuxent River NAS, US	daily high min	26.7 C (80.1 F)	0.6 C (1.1 F)	3 years	10 of 100 (Routine)
3 July 2026	Patuxent River NAS, US	daily high max (Tie)	37.8 C (100.0 F)	tie	72 years	7 of 100 (Routine)
12 June 2026	Patuxent River NAS, US	daily high max	37.2 C (99.0 F)	0.5 C (0.9 F)	40 years	21 of 100 (Routine)
11 June 2026	Patuxent River NAS, US	daily high min (Tie)	23.3 C (73.9 F)	tie	79 years	7 of 100 (Routine)
20 May 2026	Patuxent River NAS, US	daily high min (Tie)	22.8 C (73.0 F)	tie	29 years	4 of 100 (Routine)
19 May 2026	Patuxent River NAS, US	daily high min	22.2 C (72.0 F)	0.5 C (0.9 F)	28 years	17 of 100 (Routine)
18 May 2026	Patuxent River NAS, US	daily high max	32.8 C (91.0 F)	1.1 C (2.0 F)	79 years	33 of 100 (Routine)
15 April 2026	Patuxent River NAS, US	daily high min (Tie)	18.3 C (64.9 F)	tie	65 years	6 of 100 (Routine)
4 April 2026	Patuxent River NAS, US	daily high max (Tie)	28.9 C (84.0 F)	tie	69 years	7 of 100 (Routine)
4 April 2026	Patuxent River NAS, US	daily high min (Tie)	16.7 C (62.1 F)	tie	76 years	7 of 100 (Routine)
11 March 2026	Patuxent River NAS, US	daily high max	30.0 C (86.0 F)	3.3 C (5.9 F)	16 years	18 of 100 (Routine)
11 March 2026	Patuxent River NAS, US	daily high min	16.7 C (62.1 F)	3.9 C (7.0 F)	4 years	17 of 100 (Routine)
8 March 2026	Patuxent River NAS, US	daily high min	18.3 C (64.9 F)	6.1 C (11.0 F)	13 years	25 of 100 (Routine)
31 January 2026	Patuxent River NAS, US	daily low max (Tie)	-5.6 C (21.9 F)	tie	78 years	7 of 100 (Routine)
30 January 2026	Patuxent River NAS, US	daily low max	-5.6 C (21.9 F)	1.2 C (2.2 F)	60 years	27 of 100 (Routine)
19 December 2025	Patuxent River NAS, US	daily rain	27.4 mm (1.1 in)	4.0 mm (0.16 in)	76 years	34 of 100 (Routine)
25 September 2025	Patuxent River NAS, US	daily high min (Tie)	23.3 C (73.9 F)	tie	55 years	6 of 100 (Routine)

Climate Trend

73 complete years, 1946 to 2024

One stripe for each of 73 complete years at Patuxent River NAS, 1946 to 2024. Blue stripes are years cooler than the station's own mean of 14.3 C (57.7 F); red stripes are warmer. The coolest year was 1988, at 12.8 C (55.1 F), and the warmest was 2024, at 16.7 C (62.1 F). The strongest colour marks a difference of 2.5 C (4.5 F).

Annual mean temperature at Patuxent River NAS as warming stripes, 1946 to 2024
Year	Annual mean temperature	Difference from the station mean
1946	14.7 C	+0.40 C
1947	13.9 C	-0.42 C
1948	13.8 C	-0.47 C
1949	15.2 C	+0.93 C
1950	14.0 C	-0.27 C
1951	14.1 C	-0.17 C
1952	14.4 C	+0.15 C
1953	15.0 C	+0.71 C
1954	14.6 C	+0.30 C
1955	14.3 C	+0.02 C
1956	14.2 C	-0.05 C
1957	14.4 C	+0.07 C
1958	12.9 C	-1.35 C
1959	14.8 C	+0.56 C
1960	13.4 C	-0.87 C
1961	13.5 C	-0.74 C
1962	13.3 C	-1.02 C
1963	13.5 C	-0.82 C
1964	14.0 C	-0.24 C
1965	13.6 C	-0.66 C
1966	13.8 C	-0.49 C
1967	13.0 C	-1.32 C
1968	13.7 C	-0.59 C
1969	13.5 C	-0.79 C
1970	14.2 C	-0.11 C
1971	14.7 C	+0.39 C
1972	14.2 C	-0.08 C
1973	15.1 C	+0.81 C
1974	14.2 C	-0.08 C
1975	14.9 C	+0.59 C
1976	13.9 C	-0.36 C
1977	13.8 C	-0.49 C
1978	13.1 C	-1.16 C
1979	13.5 C	-0.80 C
1980	14.0 C	-0.27 C
1981	13.6 C	-0.67 C
1982	14.0 C	-0.29 C
1983	14.6 C	+0.27 C
1984	14.2 C	-0.09 C
1985	14.6 C	+0.34 C
1986	14.4 C	+0.11 C
1987	13.7 C	-0.54 C
1988	12.8 C	-1.44 C
1989	13.8 C	-0.52 C
1990	15.5 C	+1.24 C
1991	15.6 C	+1.28 C
1992	14.0 C	-0.30 C
1993	14.5 C	+0.20 C
1994	14.9 C	+0.64 C
1995	15.0 C	+0.73 C
1996	13.6 C	-0.72 C
1997	13.3 C	-0.94 C
1998	15.0 C	+0.70 C
2001	13.9 C	-0.36 C
2002	14.5 C	+0.21 C
2003	13.3 C	-0.97 C
2004	14.1 C	-0.16 C
2005	14.0 C	-0.30 C
2007	14.4 C	+0.14 C
2009	14.0 C	-0.30 C
2010	14.7 C	+0.40 C
2011	15.0 C	+0.72 C
2012	15.7 C	+1.38 C
2013	13.9 C	-0.36 C
2014	13.1 C	-1.15 C
2015	14.1 C	-0.17 C
2016	14.9 C	+0.61 C
2017	14.9 C	+0.64 C
2018	15.5 C	+1.23 C
2019	15.5 C	+1.17 C
2022	15.5 C	+1.17 C
2023	16.4 C	+2.15 C
2024	16.7 C	+2.42 C

The annual mean temperature here has risen by 0.1 C (0.1 to 0.2) per decade over 1946 to 2024. In Fahrenheit: 0.2 F (0.1 to 0.4) per decade. The slope is a straight line fitted to 73 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Patuxent River NAS
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.1 C (0.1 to 0.2) per decade	0.2 F (0.1 to 0.4) per decade	1946 to 2024	73	Rise
Mean daily maximum	0.2 C (0.1 to 0.3) per decade	0.4 F (0.3 to 0.6) per decade	1946 to 2024	73	Rise
Mean daily minimum	0.03 C (-0.05 to 0.11) per decade	0.05 F (-0.10 to 0.19) per decade	1946 to 2024	73	Not clearly different from zero

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

1945 to 2026

Yearly extremes at Patuxent River NAS: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.0 C (104.0 F)	2010	36.1 C (97.0 F)	81
Coldest night (TNn)	-19.4 C (-2.9 F)	1965	-11.6 C (11.1 F)	81
Wettest day (Rx1day)	298.7 mm (11.8 in)	2010	75.4 mm (3.0 in)	81
Wettest five days (Rx5day)	358.2 mm (14.1 in)	2010	110.8 mm (4.4 in)	81
Longest dry spell (CDD)	39 days	2024	19 days	81

Hottest day (TXx)

The hottest day of the year at Patuxent River NAS, 1945 to 2026. The record is 40.0 C (104.0 F) in 2010, marked on the chart; the median year is 36.1 C (97.0 F).

Hottest day (TXx) at Patuxent River NAS by year
Year	Hottest day (TXx)
1945	36.1 C (97.0 F)
1946	34.4 C (93.9 F)
1947	36.7 C (98.1 F)
1948	36.1 C (97.0 F)
1949	35.0 C (95.0 F)
1950	35.0 C (95.0 F)
1951	34.4 C (93.9 F)
1952	37.8 C (100.0 F)
1953	37.8 C (100.0 F)
1954	37.8 C (100.0 F)
1955	36.1 C (97.0 F)
1956	35.0 C (95.0 F)
1957	35.6 C (96.1 F)
1958	33.9 C (93.0 F)
1959	37.2 C (99.0 F)
1960	34.4 C (93.9 F)
1961	32.2 C (90.0 F)
1962	33.9 C (93.0 F)
1963	36.1 C (97.0 F)
1964	38.3 C (100.9 F)
1965	36.1 C (97.0 F)
1966	37.2 C (99.0 F)
1967	35.0 C (95.0 F)
1968	37.2 C (99.0 F)
1969	36.7 C (98.1 F)
1970	37.2 C (99.0 F)
1971	32.8 C (91.0 F)
1972	33.3 C (91.9 F)
1973	34.4 C (93.9 F)
1974	33.9 C (93.0 F)
1975	35.0 C (95.0 F)
1976	33.3 C (91.9 F)
1977	36.1 C (97.0 F)
1978	36.1 C (97.0 F)
1979	33.9 C (93.0 F)
1980	39.4 C (102.9 F)
1981	35.0 C (95.0 F)
1982	35.6 C (96.1 F)
1983	39.4 C (102.9 F)
1984	35.6 C (96.1 F)
1985	37.2 C (99.0 F)
1986	37.2 C (99.0 F)
1987	37.8 C (100.0 F)
1988	37.2 C (99.0 F)
1989	35.6 C (96.1 F)
1990	36.7 C (98.1 F)
1991	37.8 C (100.0 F)
1992	36.1 C (97.0 F)
1993	37.2 C (99.0 F)
1994	36.1 C (97.0 F)
1995	38.3 C (100.9 F)
1996	37.8 C (100.0 F)
1997	37.8 C (100.0 F)
1998	36.7 C (98.1 F)
2000	28.9 C (84.0 F)
2001	35.0 C (95.0 F)
2002	36.7 C (98.1 F)
2003	36.1 C (97.0 F)
2004	33.3 C (91.9 F)
2005	36.7 C (98.1 F)
2006	37.8 C (100.0 F)
2007	37.8 C (100.0 F)
2008	36.7 C (98.1 F)
2009	33.9 C (93.0 F)
2010	40.0 C (104.0 F)
2011	37.8 C (100.0 F)
2012	40.0 C (104.0 F)
2013	35.0 C (95.0 F)
2014	35.6 C (96.1 F)
2015	35.6 C (96.1 F)
2016	38.3 C (100.9 F)
2017	36.1 C (97.0 F)
2018	36.1 C (97.0 F)
2019	37.8 C (100.0 F)
2020	37.2 C (99.0 F)
2021	35.0 C (95.0 F)
2022	37.2 C (99.0 F)
2023	37.2 C (99.0 F)
2024	38.3 C (100.9 F)
2025	40.0 C (104.0 F)
2026	37.8 C (100.0 F)

Coldest night (TNn)

The coldest night of the year at Patuxent River NAS, 1945 to 2026. The record is -19.4 C (-2.9 F) in 1965, marked on the chart; the median year is -11.6 C (11.1 F).

Coldest night (TNn) at Patuxent River NAS by year
Year	Coldest night (TNn)
1945	-8.9 C (16.0 F)
1946	-8.3 C (17.1 F)
1947	-13.3 C (8.1 F)
1948	-12.2 C (10.0 F)
1949	-5.0 C (23.0 F)
1950	-8.9 C (16.0 F)
1951	-11.1 C (12.0 F)
1952	-8.9 C (16.0 F)
1953	-7.8 C (18.0 F)
1954	-8.9 C (16.0 F)
1955	-10.6 C (12.9 F)
1956	-6.1 C (21.0 F)
1957	-12.2 C (10.0 F)
1958	-13.9 C (7.0 F)
1959	-11.7 C (10.9 F)
1960	-11.1 C (12.0 F)
1961	-13.9 C (7.0 F)
1962	-11.1 C (12.0 F)
1963	-12.8 C (9.0 F)
1964	-10.0 C (14.0 F)
1965	-19.4 C (-2.9 F)
1966	-11.1 C (12.0 F)
1967	-12.2 C (10.0 F)
1968	-12.8 C (9.0 F)
1969	-12.2 C (10.0 F)
1970	-15.6 C (3.9 F)
1971	-12.8 C (9.0 F)
1972	-13.9 C (7.0 F)
1973	-11.1 C (12.0 F)
1974	-6.1 C (21.0 F)
1975	-6.7 C (19.9 F)
1976	-10.0 C (14.0 F)
1977	-19.4 C (-2.9 F)
1978	-11.7 C (10.9 F)
1979	-14.4 C (6.1 F)
1980	-12.2 C (10.0 F)
1981	-13.9 C (7.0 F)
1982	-18.9 C (-2.0 F)
1983	-14.4 C (6.1 F)
1984	-15.0 C (5.0 F)
1985	-18.9 C (-2.0 F)
1986	-11.7 C (10.9 F)
1987	-14.4 C (6.1 F)
1988	-12.8 C (9.0 F)
1989	-14.4 C (6.1 F)
1990	-9.4 C (15.1 F)
1991	-8.9 C (16.0 F)
1992	-7.2 C (19.0 F)
1993	-13.3 C (8.1 F)
1994	-17.8 C (0.0 F)
1995	-12.8 C (9.0 F)
1996	-15.6 C (3.9 F)
1997	-12.2 C (10.0 F)
1998	-8.3 C (17.1 F)
2000	0.0 C (32.0 F)
2001	-7.8 C (18.0 F)
2002	-10.6 C (12.9 F)
2003	-12.2 C (10.0 F)
2004	-11.1 C (12.0 F)
2005	-11.1 C (12.0 F)
2006	-8.8 C (16.2 F)
2007	-11.6 C (11.1 F)
2008	-7.7 C (18.1 F)
2009	-12.1 C (10.2 F)
2010	-12.1 C (10.2 F)
2011	-11.6 C (11.1 F)
2012	-8.2 C (17.2 F)
2013	-9.9 C (14.2 F)
2014	-17.7 C (0.1 F)
2015	-18.8 C (-1.8 F)
2016	-11.0 C (12.2 F)
2017	-13.2 C (8.2 F)
2018	-16.6 C (2.1 F)
2019	-10.5 C (13.1 F)
2020	-5.5 C (22.1 F)
2021	-4.9 C (23.2 F)
2022	-10.5 C (13.1 F)
2023	-7.1 C (19.2 F)
2024	-7.1 C (19.2 F)
2025	-11.6 C (11.1 F)
2026	-13.3 C (8.1 F)

Wettest day (Rx1day)

The wettest day of the year at Patuxent River NAS, 1945 to 2026. The record is 298.7 mm (11.8 in) in 2010, marked on the chart; the median year is 75.4 mm (3.0 in).

Wettest day (Rx1day) at Patuxent River NAS by year
Year	Wettest day (Rx1day)
1945	65.5 mm (2.6 in)
1946	67.8 mm (2.7 in)
1947	96.3 mm (3.8 in)
1948	63.8 mm (2.5 in)
1949	82.8 mm (3.3 in)
1950	64.3 mm (2.5 in)
1951	57.2 mm (2.3 in)
1952	73.4 mm (2.9 in)
1953	77.0 mm (3.0 in)
1954	53.1 mm (2.1 in)
1955	126.0 mm (5.0 in)
1956	107.2 mm (4.2 in)
1957	60.7 mm (2.4 in)
1958	118.6 mm (4.7 in)
1959	54.9 mm (2.2 in)
1960	117.1 mm (4.6 in)
1961	89.7 mm (3.5 in)
1962	54.4 mm (2.1 in)
1963	77.7 mm (3.1 in)
1964	60.5 mm (2.4 in)
1965	47.0 mm (1.9 in)
1966	90.2 mm (3.6 in)
1967	49.5 mm (1.9 in)
1968	54.9 mm (2.2 in)
1969	149.4 mm (5.9 in)
1970	42.9 mm (1.7 in)
1971	70.1 mm (2.8 in)
1972	67.1 mm (2.6 in)
1973	67.3 mm (2.6 in)
1974	94.2 mm (3.7 in)
1975	69.9 mm (2.8 in)
1976	45.5 mm (1.8 in)
1977	51.1 mm (2.0 in)
1978	56.6 mm (2.2 in)
1979	81.5 mm (3.2 in)
1980	78.2 mm (3.1 in)
1981	70.4 mm (2.8 in)
1982	66.0 mm (2.6 in)
1983	150.1 mm (5.9 in)
1984	109.5 mm (4.3 in)
1985	78.5 mm (3.1 in)
1986	80.8 mm (3.2 in)
1987	69.9 mm (2.8 in)
1988	54.4 mm (2.1 in)
1989	112.0 mm (4.4 in)
1990	95.5 mm (3.8 in)
1991	79.5 mm (3.1 in)
1992	90.2 mm (3.6 in)
1993	91.9 mm (3.6 in)
1994	92.2 mm (3.6 in)
1995	45.5 mm (1.8 in)
1996	121.7 mm (4.8 in)
1997	85.3 mm (3.4 in)
1998	90.4 mm (3.6 in)
2000	7.1 mm (0.28 in)
2001	63.0 mm (2.5 in)
2002	50.8 mm (2.0 in)
2003	54.6 mm (2.1 in)
2004	106.4 mm (4.2 in)
2005	59.4 mm (2.3 in)
2006	86.6 mm (3.4 in)
2007	73.7 mm (2.9 in)
2008	90.7 mm (3.6 in)
2009	90.4 mm (3.6 in)
2010	298.7 mm (11.8 in)
2011	203.2 mm (8.0 in)
2012	153.2 mm (6.0 in)
2013	55.9 mm (2.2 in)
2014	87.9 mm (3.5 in)
2015	69.9 mm (2.8 in)
2016	105.9 mm (4.2 in)
2017	77.5 mm (3.1 in)
2018	102.4 mm (4.0 in)
2019	105.2 mm (4.1 in)
2020	94.5 mm (3.7 in)
2021	75.4 mm (3.0 in)
2022	73.2 mm (2.9 in)
2023	65.0 mm (2.6 in)
2024	66.0 mm (2.6 in)
2025	53.6 mm (2.1 in)
2026	51.3 mm (2.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Patuxent River NAS, 1945 to 2026. The record is 358.2 mm (14.1 in) in 2010, marked on the chart; the median year is 110.8 mm (4.4 in).

Wettest five days (Rx5day) at Patuxent River NAS by year
Year	Wettest five days (Rx5day)
1945	190.0 mm (7.5 in)
1946	112.5 mm (4.4 in)
1947	111.8 mm (4.4 in)
1948	164.9 mm (6.5 in)
1949	155.9 mm (6.1 in)
1950	74.5 mm (2.9 in)
1951	103.1 mm (4.1 in)
1952	118.1 mm (4.6 in)
1953	105.2 mm (4.1 in)
1954	57.4 mm (2.3 in)
1955	189.0 mm (7.4 in)
1956	220.5 mm (8.7 in)
1957	74.1 mm (2.9 in)
1958	195.5 mm (7.7 in)
1959	122.2 mm (4.8 in)
1960	195.3 mm (7.7 in)
1961	98.3 mm (3.9 in)
1962	65.5 mm (2.6 in)
1963	113.5 mm (4.5 in)
1964	107.5 mm (4.2 in)
1965	73.9 mm (2.9 in)
1966	107.0 mm (4.2 in)
1967	112.8 mm (4.4 in)
1968	80.8 mm (3.2 in)
1969	163.1 mm (6.4 in)
1970	52.6 mm (2.1 in)
1971	110.8 mm (4.4 in)
1972	100.6 mm (4.0 in)
1973	80.2 mm (3.2 in)
1974	121.6 mm (4.8 in)
1975	100.1 mm (3.9 in)
1976	77.5 mm (3.1 in)
1977	70.1 mm (2.8 in)
1978	85.6 mm (3.4 in)
1979	120.9 mm (4.8 in)
1980	83.6 mm (3.3 in)
1981	79.1 mm (3.1 in)
1982	125.2 mm (4.9 in)
1983	175.5 mm (6.9 in)
1984	217.9 mm (8.6 in)
1985	137.1 mm (5.4 in)
1986	94.0 mm (3.7 in)
1987	89.4 mm (3.5 in)
1988	72.4 mm (2.9 in)
1989	121.2 mm (4.8 in)
1990	143.6 mm (5.7 in)
1991	120.4 mm (4.7 in)
1992	140.9 mm (5.5 in)
1993	98.3 mm (3.9 in)
1994	149.3 mm (5.9 in)
1995	59.5 mm (2.3 in)
1996	144.8 mm (5.7 in)
1997	102.2 mm (4.0 in)
1998	122.2 mm (4.8 in)
2000	14.0 mm (0.6 in)
2001	102.4 mm (4.0 in)
2002	90.2 mm (3.6 in)
2003	92.7 mm (3.6 in)
2004	176.3 mm (6.9 in)
2005	111.5 mm (4.4 in)
2006	139.2 mm (5.5 in)
2007	104.9 mm (4.1 in)
2008	119.9 mm (4.7 in)
2009	139.4 mm (5.5 in)
2010	358.2 mm (14.1 in)
2011	244.1 mm (9.6 in)
2012	211.3 mm (8.3 in)
2013	121.1 mm (4.8 in)
2014	88.5 mm (3.5 in)
2015	91.4 mm (3.6 in)
2016	110.7 mm (4.4 in)
2017	77.8 mm (3.1 in)
2018	163.3 mm (6.4 in)
2019	118.4 mm (4.7 in)
2020	145.8 mm (5.7 in)
2021	107.1 mm (4.2 in)
2022	126.3 mm (5.0 in)
2023	93.4 mm (3.7 in)
2024	87.6 mm (3.4 in)
2025	87.9 mm (3.5 in)
2026	70.6 mm (2.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Patuxent River NAS, 1945 to 2026. The record is 39 days in 2024, marked on the chart; the median year is 19 days.

Longest dry spell (CDD) at Patuxent River NAS by year
Year	Longest dry spell (CDD)
1945	14 days
1946	22 days
1947	15 days
1948	16 days
1949	28 days
1950	15 days
1951	12 days
1952	22 days
1953	18 days
1954	25 days
1955	17 days
1956	17 days
1957	19 days
1958	17 days
1959	26 days
1960	16 days
1961	15 days
1962	16 days
1963	32 days
1964	32 days
1965	24 days
1966	32 days
1967	20 days
1968	26 days
1969	24 days
1970	19 days
1971	18 days
1972	13 days
1973	26 days
1974	16 days
1975	19 days
1976	20 days
1977	26 days
1978	33 days
1979	12 days
1980	16 days
1981	16 days
1982	27 days
1983	12 days
1984	20 days
1985	22 days
1986	34 days
1987	16 days
1988	15 days
1989	15 days
1990	17 days
1991	23 days
1992	18 days
1993	19 days
1994	20 days
1995	16 days
1996	13 days
1997	15 days
1998	19 days
2000	12 days
2001	38 days
2002	19 days
2003	17 days
2004	17 days
2005	28 days
2006	17 days
2007	23 days
2008	18 days
2009	15 days
2010	24 days
2011	18 days
2012	23 days
2013	15 days
2014	12 days
2015	20 days
2016	23 days
2017	20 days
2018	22 days
2019	25 days
2020	11 days
2021	19 days
2022	15 days
2023	17 days
2024	39 days
2025	12 days
2026	20 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.

Frost Dates and Growing Season

73 years with a frost

Across 73 years with a frost, the median last spring frost at Patuxent River NAS falls on 29 March and the median first autumn frost on 17 November, which leaves a median of 232 days between them.

In 1989 to 2024 the median growing season was 228 days. That is 8 days fewer than in 1946 to 1975.

Fitted over all years, the growing season changes by -1.0 days per decade at this station.

Frost dates and growing season at Patuxent River NAS
Measure	Median, all years	Earliest period (1946 to 1975)	Recent period (1989 to 2024)	Recent against earliest	Fitted trend
Last spring frost	29 March	29 March	29 March	no change	0.0 days per decade
First autumn frost	17 November	21 November	12 November	9 days earlier	-1.0 days per decade
Growing days	232 days	236 days	228 days	8 days fewer	-1.0 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

76 years, 1946 to 2024

A day with at least 75.2 mm (3.0 in) of rain is expected about once in 2 years. A day with at least 225.0 mm (8.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Patuxent River NAS: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	75.2 mm (3.0 in)
5 years	102.7 mm (4.0 in)
10 years	125.1 mm (4.9 in)
25 years	159.3 mm (6.3 in)
50 years	189.7 mm (7.5 in)
100 years	225.0 mm (8.9 in)	Longer than the 76 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, 76 years of values from 1946 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: 298.7 mm (11.8 in) in 2010; 203.2 mm (8.0 in) in 2011; 153.2 mm (6.0 in) in 2012.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Climate Twins

2007 to 2024 against 1961 to 1990

Over 2007 to 2024, Patuxent River NAS had a mean temperature of 15.0 C (58.9 F) and 1,070.8 mm (42.2 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Baltimore Customs House (United States, 111 km away), Langley AFB (United States, 135 km away) and Lead Hill (United States, 1,471 km away).

Climate twins of Patuxent River NAS: stations whose 1961 to 1990 climate is closest to its 2007 to 2024 climate
Twin station	Country	Distance away	Mean temperature, 1961-1990	Rain a year, 1961-1990	Climate difference
Baltimore Customs House	United States	111 km (69 mi)	14.5 C (58.1 F)	1,085.7 mm (42.7 in)	0.80
Langley AFB	United States	135 km (84 mi)	14.9 C (58.9 F)	1,142.0 mm (45.0 in)	0.83
Lead Hill	United States	1,471 km (914 mi)	14.8 C (58.6 F)	1,100.3 mm (43.3 in)	0.85

Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.

Download the Data

Data for Patuxent River NAS standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Patuxent River NAS 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 2026-10-12 (12 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-13. Last revised 13 October 2026 (2026-10-13).