Record envelope, standing records and threshold days for Assateague (USC00180335), Maryland, United States, with 45 years of record.
Key Facts for Assateague
Assateague (USC00180335) is a weather station in Maryland, United States at 38.07 latitude and -75.21 longitude, 3 m (10 ft) above sea level.
The station reports from 1968 to 2012, 45 years of record.
1,464 records set at Assateague still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Assateague tied a daily record high maximum temperature of 34.4 C (93.9 F) on 28 June 2012.
About the Station
Location: Maryland, United States, 38.07 latitude, -75.21 longitude.
Elevation: 3 m (10 ft).
Period of record: 1968 to 2012, 45 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Assateague. 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 Assateague, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
23.3 C (73.9 F)
-18.9 C (-2.0 F)
n/a
n/a
Feb
24.4 C (75.9 F)
-17.8 C (0.0 F)
n/a
n/a
Mar
31.7 C (89.1 F)
-12.2 C (10.0 F)
n/a
n/a
Apr
32.2 C (90.0 F)
-6.7 C (19.9 F)
n/a
n/a
May
37.2 C (99.0 F)
1.7 C (35.1 F)
n/a
n/a
Jun
41.1 C (106.0 F)
5.0 C (41.0 F)
n/a
n/a
Jul
38.9 C (102.0 F)
9.4 C (48.9 F)
n/a
n/a
Aug
38.3 C (100.9 F)
8.9 C (48.0 F)
n/a
n/a
Sep
35.6 C (96.1 F)
4.4 C (39.9 F)
n/a
n/a
Oct
34.4 C (93.9 F)
-3.3 C (26.1 F)
n/a
n/a
Nov
27.2 C (81.0 F)
-9.4 C (15.1 F)
n/a
n/a
Dec
26.1 C (79.0 F)
-16.7 C (1.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Assateague still stand. 1989 holds the most, with 62.
Standing records at Assateague by the year they were set
Year set
Standing records
1968
11
1969
23
1970
54
1971
49
1972
47
1973
17
1974
56
1975
40
1976
50
1977
40
1978
29
1979
44
1980
27
1981
22
1982
24
1983
23
1984
39
1985
42
1986
50
1987
28
1988
34
1989
62
1990
46
1991
39
1992
29
1993
33
1994
24
1995
23
1996
29
1997
25
1998
27
1999
28
2000
23
2001
29
2002
45
2003
19
2004
10
2005
19
2006
23
2007
42
2008
27
2009
18
2010
29
2011
19
2012
47
All-Time Record Progression
1 new records
1 all-time records were set at Assateague between 6 February 2010 and 6 February 2010. Each dot is a new record.
When Assateague set new all-time records
Date
Kind
Detail
2010-02-06
Record snow depth
Record snow depth 20.3 cm (8.0 in)
Wettest Day of Each Month
Aug: 225.3 mm (8.9 in)
The wettest day on record for each calendar month at Assateague. The most was 225.3 mm (8.9 in) on 19 August 1985.
Record daily precipitation for each month at Assateague
Month
Record daily precipitation (mm)
Date
Jan
89.9 mm (3.5 in)
28 January 1998
Feb
72.9 mm (2.9 in)
4 February 1998
Mar
80.5 mm (3.2 in)
14 March 1999
Apr
66.8 mm (2.6 in)
30 April 1995
May
53.3 mm (2.1 in)
20 May 2005
Jun
73.9 mm (2.9 in)
4 June 2008
Jul
158.2 mm (6.2 in)
23 July 1969
Aug
225.3 mm (8.9 in)
19 August 1985
Sep
188.7 mm (7.4 in)
10 September 2009
Oct
98.0 mm (3.9 in)
8 October 1996
Nov
101.3 mm (4.0 in)
12 November 2009
Dec
84.8 mm (3.3 in)
11 December 2008
Period of Record Coverage
1968 to 2012
Complete yearUnder 90 percent of days
45 years of record at Assateague, 1968 to 2012. 10 years have data for under 90 percent of days and are left out of rankings: 1968, 1982, 1985, 1988, 1991, 1992, 2004, 2009 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 29 complete years at Assateague, 1969 to 2007. Blue stripes are years cooler than the station's own mean of 13.7 C (56.7 F); red stripes are warmer. The coolest year was 1978, at 12.6 C (54.7 F), and the warmest was 1998, at 15.0 C (58.9 F). The strongest colour marks a difference of 1.3 C (2.3 F).
Annual mean temperature at Assateague as warming stripes, 1969 to 2007
Year
Annual mean temperature
Difference from the station mean
1969
13.1 C
-0.59 C
1970
13.3 C
-0.41 C
1971
13.6 C
-0.16 C
1972
13.1 C
-0.61 C
1975
14.1 C
+0.40 C
1976
12.9 C
-0.85 C
1977
13.3 C
-0.45 C
1978
12.6 C
-1.12 C
1979
13.1 C
-0.62 C
1980
13.1 C
-0.63 C
1981
13.3 C
-0.41 C
1983
13.9 C
+0.14 C
1984
14.1 C
+0.33 C
1986
13.6 C
-0.14 C
1989
13.2 C
-0.55 C
1990
13.9 C
+0.18 C
1991
14.2 C
+0.50 C
1993
13.7 C
-0.07 C
1994
13.5 C
-0.25 C
1997
13.7 C
-0.01 C
1998
15.0 C
+1.23 C
1999
14.5 C
+0.77 C
2000
13.6 C
-0.09 C
2001
14.3 C
+0.61 C
2002
14.9 C
+1.18 C
2003
13.4 C
-0.38 C
2005
13.9 C
+0.20 C
2006
14.7 C
+0.98 C
2007
14.5 C
+0.80 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
1968 to 2012
Yearly extremes at Assateague: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.1 C (106.0 F)
1989
36.1 C (97.0 F)
45
Coldest night (TNn)
-18.9 C (-2.0 F)
1982
-11.7 C (10.9 F)
45
Wettest day (Rx1day)
225.3 mm (8.9 in)
1985
66.8 mm (2.6 in)
45
Wettest five days (Rx5day)
261.1 mm (10.3 in)
2009
102.1 mm (4.0 in)
45
Longest dry spell (CDD)
54 days
2001
20 days
45
Hottest day (TXx)
The hottest day of the year at Assateague, 1968 to 2012. The record is 41.1 C (106.0 F) in 1989, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Assateague by year
Year
Hottest day (TXx)
1968
27.8 C (82.0 F)
1969
35.0 C (95.0 F)
1970
32.8 C (91.0 F)
1971
33.3 C (91.9 F)
1972
36.1 C (97.0 F)
1973
35.6 C (96.1 F)
1974
33.9 C (93.0 F)
1975
34.4 C (93.9 F)
1976
34.4 C (93.9 F)
1977
36.7 C (98.1 F)
1978
34.4 C (93.9 F)
1979
35.6 C (96.1 F)
1980
37.8 C (100.0 F)
1981
36.7 C (98.1 F)
1982
32.8 C (91.0 F)
1983
36.1 C (97.0 F)
1984
35.0 C (95.0 F)
1985
35.0 C (95.0 F)
1986
38.3 C (100.9 F)
1987
36.7 C (98.1 F)
1988
36.1 C (97.0 F)
1989
41.1 C (106.0 F)
1990
35.6 C (96.1 F)
1991
35.0 C (95.0 F)
1992
33.9 C (93.0 F)
1993
36.1 C (97.0 F)
1994
34.4 C (93.9 F)
1995
37.2 C (99.0 F)
1996
37.2 C (99.0 F)
1997
36.1 C (97.0 F)
1998
37.2 C (99.0 F)
1999
38.9 C (102.0 F)
2000
34.4 C (93.9 F)
2001
36.1 C (97.0 F)
2002
37.8 C (100.0 F)
2003
35.6 C (96.1 F)
2004
34.4 C (93.9 F)
2005
35.6 C (96.1 F)
2006
37.8 C (100.0 F)
2007
38.3 C (100.9 F)
2008
36.1 C (97.0 F)
2009
32.8 C (91.0 F)
2010
38.3 C (100.9 F)
2011
38.9 C (102.0 F)
2012
36.1 C (97.0 F)
Coldest night (TNn)
The coldest night of the year at Assateague, 1968 to 2012. The record is -18.9 C (-2.0 F) in 1982, marked on the chart; the median year is -11.7 C (10.9 F).
Coldest night (TNn) at Assateague by year
Year
Coldest night (TNn)
1968
-10.0 C (14.0 F)
1969
-11.7 C (10.9 F)
1970
-15.0 C (5.0 F)
1971
-13.9 C (7.0 F)
1972
-12.8 C (9.0 F)
1973
-11.7 C (10.9 F)
1974
-8.3 C (17.1 F)
1975
-7.8 C (18.0 F)
1976
-12.8 C (9.0 F)
1977
-16.1 C (3.0 F)
1978
-11.7 C (10.9 F)
1979
-16.1 C (3.0 F)
1980
-13.3 C (8.1 F)
1981
-15.0 C (5.0 F)
1982
-18.9 C (-2.0 F)
1983
-10.0 C (14.0 F)
1984
-13.9 C (7.0 F)
1985
-18.3 C (-0.9 F)
1986
-11.7 C (10.9 F)
1987
-11.1 C (12.0 F)
1988
-11.7 C (10.9 F)
1989
-17.8 C (0.0 F)
1990
-9.4 C (15.1 F)
1991
-15.6 C (3.9 F)
1992
-9.4 C (15.1 F)
1993
-11.7 C (10.9 F)
1994
-17.2 C (1.0 F)
1995
-12.2 C (10.0 F)
1996
-13.9 C (7.0 F)
1997
-12.8 C (9.0 F)
1998
-8.3 C (17.1 F)
1999
-12.2 C (10.0 F)
2000
-10.6 C (12.9 F)
2001
-9.4 C (15.1 F)
2002
-7.8 C (18.0 F)
2003
-14.4 C (6.1 F)
2004
-10.6 C (12.9 F)
2005
-11.1 C (12.0 F)
2006
-7.8 C (18.0 F)
2007
-11.7 C (10.9 F)
2008
-10.0 C (14.0 F)
2009
-12.8 C (9.0 F)
2010
-9.4 C (15.1 F)
2011
-12.2 C (10.0 F)
2012
-2.2 C (28.0 F)
Wettest day (Rx1day)
The wettest day of the year at Assateague, 1968 to 2012. The record is 225.3 mm (8.9 in) in 1985, marked on the chart; the median year is 66.8 mm (2.6 in).
Wettest day (Rx1day) at Assateague by year
Year
Wettest day (Rx1day)
1968
29.5 mm (1.2 in)
1969
158.2 mm (6.2 in)
1970
42.4 mm (1.7 in)
1971
93.0 mm (3.7 in)
1972
72.1 mm (2.8 in)
1973
55.1 mm (2.2 in)
1974
98.3 mm (3.9 in)
1975
53.3 mm (2.1 in)
1976
76.2 mm (3.0 in)
1977
69.1 mm (2.7 in)
1978
47.0 mm (1.9 in)
1979
69.3 mm (2.7 in)
1980
50.8 mm (2.0 in)
1981
53.3 mm (2.1 in)
1982
58.2 mm (2.3 in)
1983
54.6 mm (2.1 in)
1984
47.8 mm (1.9 in)
1985
225.3 mm (8.9 in)
1986
82.6 mm (3.3 in)
1987
66.0 mm (2.6 in)
1988
34.8 mm (1.4 in)
1989
101.6 mm (4.0 in)
1990
63.5 mm (2.5 in)
1991
53.3 mm (2.1 in)
1992
101.6 mm (4.0 in)
1993
75.4 mm (3.0 in)
1994
77.5 mm (3.1 in)
1995
66.8 mm (2.6 in)
1996
98.0 mm (3.9 in)
1997
50.8 mm (2.0 in)
1998
89.9 mm (3.5 in)
1999
98.0 mm (3.9 in)
2000
59.9 mm (2.4 in)
2001
57.7 mm (2.3 in)
2002
53.1 mm (2.1 in)
2003
70.4 mm (2.8 in)
2004
75.7 mm (3.0 in)
2005
53.3 mm (2.1 in)
2006
146.3 mm (5.8 in)
2007
56.6 mm (2.2 in)
2008
84.8 mm (3.3 in)
2009
188.7 mm (7.4 in)
2010
59.4 mm (2.3 in)
2011
170.7 mm (6.7 in)
2012
61.5 mm (2.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Assateague, 1968 to 2012. The record is 261.1 mm (10.3 in) in 2009, marked on the chart; the median year is 102.1 mm (4.0 in).
Wettest five days (Rx5day) at Assateague by year
Year
Wettest five days (Rx5day)
1968
46.6 mm (1.8 in)
1969
202.5 mm (8.0 in)
1970
58.4 mm (2.3 in)
1971
127.5 mm (5.0 in)
1972
81.2 mm (3.2 in)
1973
58.9 mm (2.3 in)
1974
121.6 mm (4.8 in)
1975
112.5 mm (4.4 in)
1976
170.0 mm (6.7 in)
1977
144.8 mm (5.7 in)
1978
100.4 mm (4.0 in)
1979
118.4 mm (4.7 in)
1980
76.0 mm (3.0 in)
1981
80.6 mm (3.2 in)
1982
89.2 mm (3.5 in)
1983
82.3 mm (3.2 in)
1984
106.6 mm (4.2 in)
1985
225.8 mm (8.9 in)
1986
102.1 mm (4.0 in)
1987
113.5 mm (4.5 in)
1988
60.2 mm (2.4 in)
1989
176.6 mm (7.0 in)
1990
82.9 mm (3.3 in)
1991
117.6 mm (4.6 in)
1992
229.6 mm (9.0 in)
1993
85.9 mm (3.4 in)
1994
91.9 mm (3.6 in)
1995
97.5 mm (3.8 in)
1996
165.6 mm (6.5 in)
1997
85.4 mm (3.4 in)
1998
113.0 mm (4.4 in)
1999
131.5 mm (5.2 in)
2000
81.2 mm (3.2 in)
2001
74.7 mm (2.9 in)
2002
84.1 mm (3.3 in)
2003
119.5 mm (4.7 in)
2004
175.3 mm (6.9 in)
2005
78.0 mm (3.1 in)
2006
162.0 mm (6.4 in)
2007
87.6 mm (3.4 in)
2008
114.3 mm (4.5 in)
2009
261.1 mm (10.3 in)
2010
91.4 mm (3.6 in)
2011
187.2 mm (7.4 in)
2012
62.3 mm (2.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Assateague, 1968 to 2012. The record is 54 days in 2001, marked on the chart; the median year is 20 days.
Longest dry spell (CDD) at Assateague by year
Year
Longest dry spell (CDD)
1968
12 days
1969
23 days
1970
25 days
1971
21 days
1972
15 days
1973
25 days
1974
26 days
1975
24 days
1976
19 days
1977
18 days
1978
24 days
1979
17 days
1980
17 days
1981
16 days
1982
25 days
1983
18 days
1984
23 days
1985
11 days
1986
20 days
1987
14 days
1988
14 days
1989
27 days
1990
16 days
1991
26 days
1992
12 days
1993
28 days
1994
20 days
1995
25 days
1996
19 days
1997
18 days
1998
25 days
1999
23 days
2000
48 days
2001
54 days
2002
19 days
2003
15 days
2004
16 days
2005
24 days
2006
22 days
2007
21 days
2008
16 days
2009
15 days
2010
20 days
2011
19 days
2012
9 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
29 years with a frost
Across 29 years with a frost, the median last spring frost at Assateague falls on 3 April and the median first autumn frost on 12 November, which leaves a median of 221 days between them.
Fitted over all years, the growing season changes by +8.6 days per decade at this station.
Frost dates and growing season at Assateague
Measure
Median, all years
Earliest period
Recent period (1969 to 2007)
Recent against earliest
Fitted trend
Last spring frost
3 April
n/a
3 April
n/a
-1.9 days per decade
First autumn frost
12 November
n/a
12 November
n/a
+6.8 days per decade
Growing days
221 days
n/a
221 days
n/a
+8.6 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
36 years, 1969 to 2010
A day with at least 65.3 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 179.2 mm (7.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Assateague: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
65.3 mm (2.6 in)
5 years
85.9 mm (3.4 in)
10 years
102.9 mm (4.1 in)
25 years
128.9 mm (5.1 in)
50 years
152.1 mm (6.0 in)
Longer than the 36 years of record
100 years
179.2 mm (7.1 in)
Longer than the 36 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, 36 years of values from 1969 to 2010.
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: 158.2 mm (6.2 in) in 1969; 146.3 mm (5.8 in) in 2006; 101.6 mm (4.0 in) in 1989.
Download the Data
Data for Assateague standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Assateague 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.