Record envelope, standing records and threshold days for Clarksville 3 NNE (USC00181862), Maryland, United States, with 38 years of record.
Key Facts for Clarksville 3 NNE
Clarksville 3 NNE (USC00181862) is a weather station in Maryland, United States at 39.26 latitude and -76.93 longitude, 113 m (370 ft) above sea level.
The station reports from 1967 to 2004, 38 years of record.
1,464 records set at Clarksville 3 NNE still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Clarksville 3 NNE set a daily record high minimum temperature of 21.7 C (71.1 F) on 31 July 2004.
About the Station
Location: Maryland, United States, 39.26 latitude, -76.93 longitude.
Elevation: 113 m (370 ft).
Period of record: 1967 to 2004, 38 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 Clarksville 3 NNE. 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 Clarksville 3 NNE, 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)
-27.8 C (-18.0 F)
n/a
n/a
Feb
26.7 C (80.1 F)
-27.2 C (-17.0 F)
n/a
n/a
Mar
31.7 C (89.1 F)
-16.1 C (3.0 F)
n/a
n/a
Apr
35.0 C (95.0 F)
-8.9 C (16.0 F)
n/a
n/a
May
35.6 C (96.1 F)
-3.3 C (26.1 F)
n/a
n/a
Jun
37.8 C (100.0 F)
1.1 C (34.0 F)
n/a
n/a
Jul
39.4 C (102.9 F)
4.4 C (39.9 F)
n/a
n/a
Aug
39.4 C (102.9 F)
2.8 C (37.0 F)
n/a
n/a
Sep
37.2 C (99.0 F)
-1.1 C (30.0 F)
n/a
n/a
Oct
31.1 C (88.0 F)
-8.3 C (17.1 F)
n/a
n/a
Nov
28.9 C (84.0 F)
-15.0 C (5.0 F)
n/a
n/a
Dec
25.6 C (78.1 F)
-21.1 C (-6.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Clarksville 3 NNE still stand. 1991 holds the most, with 71.
Standing records at Clarksville 3 NNE by the year they were set
Year set
Standing records
1967
3
1968
41
1969
29
1970
37
1971
43
1972
48
1973
41
1974
48
1975
46
1976
56
1977
58
1978
41
1979
58
1980
40
1981
32
1982
39
1983
47
1984
57
1985
40
1986
54
1987
36
1988
53
1989
60
1990
56
1991
71
1992
37
1993
30
1995
3
1996
46
1997
41
1998
47
1999
19
2000
35
2001
5
2002
47
2003
6
2004
14
Wettest Day of Each Month
Jun: 231.9 mm (9.1 in)
The wettest day on record for each calendar month at Clarksville 3 NNE. The most was 231.9 mm (9.1 in) on 22 June 1972.
Record daily precipitation for each month at Clarksville 3 NNE
Month
Record daily precipitation (mm)
Date
Jan
61.7 mm (2.4 in)
1 January 1976
Feb
121.9 mm (4.8 in)
16 February 1996
Mar
68.1 mm (2.7 in)
26 March 1978
Apr
53.1 mm (2.1 in)
15 April 1983
May
96.5 mm (3.8 in)
6 May 1989
Jun
231.9 mm (9.1 in)
22 June 1972
Jul
73.7 mm (2.9 in)
13 July 1996
Aug
109.2 mm (4.3 in)
27 August 1971
Sep
134.1 mm (5.3 in)
26 September 1975
Oct
61.0 mm (2.4 in)
19 October 1996
Nov
65.5 mm (2.6 in)
25 November 1971
Dec
78.5 mm (3.1 in)
18 December 1977
Period of Record Coverage
1967 to 2004
Complete yearUnder 90 percent of days
37 years of record at Clarksville 3 NNE, 1967 to 2004. 8 years have data for under 90 percent of days and are left out of rankings: 1967, 1993, 1995, 1999, 2000, 2001, 2003, 2004.
Cooler than the station meanWarmer than the station mean
One stripe for each of 27 complete years at Clarksville 3 NNE, 1968 to 1998. Blue stripes are years cooler than the station's own mean of 12.1 C (53.7 F); red stripes are warmer. The coolest year was 1978, at 11.1 C (51.9 F), and the warmest was 1991, at 13.5 C (56.3 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Clarksville 3 NNE as warming stripes, 1968 to 1998
Year
Annual mean temperature
Difference from the station mean
1968
11.5 C
-0.52 C
1969
11.4 C
-0.63 C
1970
11.8 C
-0.26 C
1971
12.0 C
-0.02 C
1972
11.6 C
-0.42 C
1973
12.9 C
+0.80 C
1974
12.3 C
+0.20 C
1975
12.5 C
+0.39 C
1976
11.6 C
-0.49 C
1977
12.0 C
-0.07 C
1978
11.1 C
-0.99 C
1979
11.6 C
-0.50 C
1980
12.1 C
+0.03 C
1981
11.6 C
-0.42 C
1982
12.0 C
-0.06 C
1983
12.3 C
+0.21 C
1984
12.4 C
+0.33 C
1985
12.5 C
+0.46 C
1986
12.2 C
+0.18 C
1987
12.5 C
+0.39 C
1988
12.0 C
-0.09 C
1989
12.0 C
-0.02 C
1991
13.5 C
+1.45 C
1992
11.9 C
-0.13 C
1996
11.5 C
-0.58 C
1997
12.0 C
-0.06 C
1998
13.0 C
+0.90 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
1967 to 2004
Yearly extremes at Clarksville 3 NNE: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
39.4 C (102.9 F)
1983
36.1 C (97.0 F)
37
Coldest night (TNn)
-27.8 C (-18.0 F)
1984
-18.3 C (-0.9 F)
37
Wettest day (Rx1day)
231.9 mm (9.1 in)
1972
63.0 mm (2.5 in)
37
Wettest five days (Rx5day)
301.6 mm (11.9 in)
1972
90.7 mm (3.6 in)
37
Longest dry spell (CDD)
29 days
1977
17 days
37
Hottest day (TXx)
The hottest day of the year at Clarksville 3 NNE, 1967 to 2004. The record is 39.4 C (102.9 F) in 1983, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Clarksville 3 NNE by year
Year
Hottest day (TXx)
1967
16.1 C (61.0 F)
1968
35.0 C (95.0 F)
1969
36.1 C (97.0 F)
1970
35.6 C (96.1 F)
1971
33.3 C (91.9 F)
1972
35.0 C (95.0 F)
1973
36.7 C (98.1 F)
1974
34.4 C (93.9 F)
1975
36.1 C (97.0 F)
1976
33.9 C (93.0 F)
1977
37.2 C (99.0 F)
1978
35.6 C (96.1 F)
1979
33.3 C (91.9 F)
1980
38.3 C (100.9 F)
1981
34.4 C (93.9 F)
1982
36.1 C (97.0 F)
1983
39.4 C (102.9 F)
1984
36.1 C (97.0 F)
1985
36.1 C (97.0 F)
1986
36.7 C (98.1 F)
1987
36.7 C (98.1 F)
1988
39.4 C (102.9 F)
1989
35.0 C (95.0 F)
1990
37.2 C (99.0 F)
1991
38.9 C (102.0 F)
1992
36.1 C (97.0 F)
1993
37.2 C (99.0 F)
1995
15.6 C (60.1 F)
1996
35.0 C (95.0 F)
1997
38.9 C (102.0 F)
1998
36.1 C (97.0 F)
1999
37.2 C (99.0 F)
2000
33.9 C (93.0 F)
2001
33.9 C (93.0 F)
2002
38.3 C (100.9 F)
2003
33.3 C (91.9 F)
2004
32.8 C (91.0 F)
Coldest night (TNn)
The coldest night of the year at Clarksville 3 NNE, 1967 to 2004. The record is -27.8 C (-18.0 F) in 1984, marked on the chart; the median year is -18.3 C (-0.9 F).
Coldest night (TNn) at Clarksville 3 NNE by year
Year
Coldest night (TNn)
1967
-19.4 C (-2.9 F)
1968
-25.0 C (-13.0 F)
1969
-15.0 C (5.0 F)
1970
-20.0 C (-4.0 F)
1971
-15.6 C (3.9 F)
1972
-17.8 C (0.0 F)
1973
-15.6 C (3.9 F)
1974
-20.6 C (-5.1 F)
1975
-13.9 C (7.0 F)
1976
-17.2 C (1.0 F)
1977
-20.6 C (-5.1 F)
1978
-20.0 C (-4.0 F)
1979
-27.2 C (-17.0 F)
1980
-19.4 C (-2.9 F)
1981
-22.2 C (-8.0 F)
1982
-23.9 C (-11.0 F)
1983
-24.4 C (-11.9 F)
1984
-27.8 C (-18.0 F)
1985
-22.8 C (-9.0 F)
1986
-17.8 C (0.0 F)
1987
-26.7 C (-16.1 F)
1988
-22.8 C (-9.0 F)
1989
-21.1 C (-6.0 F)
1990
-12.2 C (10.0 F)
1991
-13.9 C (7.0 F)
1992
-15.0 C (5.0 F)
1993
-15.6 C (3.9 F)
1995
-15.6 C (3.9 F)
1996
-26.7 C (-16.1 F)
1997
-18.3 C (-0.9 F)
1998
-15.6 C (3.9 F)
1999
-16.1 C (3.0 F)
2000
-16.7 C (1.9 F)
2001
6.1 C (43.0 F)
2002
-18.9 C (-2.0 F)
2003
-12.2 C (10.0 F)
2004
-17.2 C (1.0 F)
Wettest day (Rx1day)
The wettest day of the year at Clarksville 3 NNE, 1967 to 2004. The record is 231.9 mm (9.1 in) in 1972, marked on the chart; the median year is 63.0 mm (2.5 in).
Wettest day (Rx1day) at Clarksville 3 NNE by year
Year
Wettest day (Rx1day)
1967
44.5 mm (1.8 in)
1968
74.2 mm (2.9 in)
1969
50.0 mm (2.0 in)
1970
60.2 mm (2.4 in)
1971
109.2 mm (4.3 in)
1972
231.9 mm (9.1 in)
1973
57.9 mm (2.3 in)
1974
75.7 mm (3.0 in)
1975
134.1 mm (5.3 in)
1976
75.2 mm (3.0 in)
1977
78.5 mm (3.1 in)
1978
68.1 mm (2.7 in)
1979
78.5 mm (3.1 in)
1980
50.8 mm (2.0 in)
1981
41.1 mm (1.6 in)
1982
54.1 mm (2.1 in)
1983
53.1 mm (2.1 in)
1984
72.4 mm (2.9 in)
1985
95.3 mm (3.8 in)
1986
58.9 mm (2.3 in)
1987
73.7 mm (2.9 in)
1988
65.5 mm (2.6 in)
1989
96.5 mm (3.8 in)
1990
53.6 mm (2.1 in)
1991
74.2 mm (2.9 in)
1992
63.0 mm (2.5 in)
1993
48.3 mm (1.9 in)
1995
22.1 mm (0.9 in)
1996
121.9 mm (4.8 in)
1997
54.6 mm (2.1 in)
1998
58.7 mm (2.3 in)
1999
86.1 mm (3.4 in)
2000
53.8 mm (2.1 in)
2001
89.4 mm (3.5 in)
2002
37.6 mm (1.5 in)
2003
43.7 mm (1.7 in)
2004
45.2 mm (1.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Clarksville 3 NNE, 1967 to 2004. The record is 301.6 mm (11.9 in) in 1972, marked on the chart; the median year is 90.7 mm (3.6 in).
Wettest five days (Rx5day) at Clarksville 3 NNE by year
Year
Wettest five days (Rx5day)
1967
58.0 mm (2.3 in)
1968
116.8 mm (4.6 in)
1969
79.5 mm (3.1 in)
1970
84.3 mm (3.3 in)
1971
165.4 mm (6.5 in)
1972
301.6 mm (11.9 in)
1973
84.1 mm (3.3 in)
1974
87.2 mm (3.4 in)
1975
274.3 mm (10.8 in)
1976
109.5 mm (4.3 in)
1977
120.6 mm (4.7 in)
1978
94.2 mm (3.7 in)
1979
128.8 mm (5.1 in)
1980
60.5 mm (2.4 in)
1981
69.6 mm (2.7 in)
1982
77.0 mm (3.0 in)
1983
87.9 mm (3.5 in)
1984
134.9 mm (5.3 in)
1985
99.8 mm (3.9 in)
1986
97.6 mm (3.8 in)
1987
92.0 mm (3.6 in)
1988
112.2 mm (4.4 in)
1989
127.0 mm (5.0 in)
1990
108.2 mm (4.3 in)
1991
81.3 mm (3.2 in)
1992
90.7 mm (3.6 in)
1993
68.4 mm (2.7 in)
1995
33.1 mm (1.3 in)
1996
136.4 mm (5.4 in)
1997
70.6 mm (2.8 in)
1998
78.7 mm (3.1 in)
1999
104.1 mm (4.1 in)
2000
70.3 mm (2.8 in)
2001
97.5 mm (3.8 in)
2002
60.4 mm (2.4 in)
2003
74.6 mm (2.9 in)
2004
55.3 mm (2.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Clarksville 3 NNE, 1967 to 2004. The record is 29 days in 1977, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Clarksville 3 NNE by year
Year
Longest dry spell (CDD)
1967
9 days
1968
26 days
1969
17 days
1970
15 days
1971
14 days
1972
12 days
1973
14 days
1974
19 days
1975
12 days
1976
16 days
1977
29 days
1978
20 days
1979
16 days
1980
17 days
1981
16 days
1982
16 days
1983
21 days
1984
23 days
1985
14 days
1986
20 days
1987
26 days
1988
21 days
1989
18 days
1990
18 days
1991
22 days
1992
17 days
1993
18 days
1995
11 days
1996
11 days
1997
14 days
1998
21 days
1999
17 days
2000
21 days
2001
10 days
2002
20 days
2003
9 days
2004
24 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
27 years with a frost
Across 27 years with a frost, the median last spring frost at Clarksville 3 NNE falls on 7 May and the median first autumn frost on 8 October, which leaves a median of 157 days between them.
Fitted over all years, the growing season changes by -2.7 days per decade at this station.
Frost dates and growing season at Clarksville 3 NNE
Measure
Median, all years
Earliest period
Recent period (1968 to 1998)
Recent against earliest
Fitted trend
Last spring frost
7 May
n/a
7 May
n/a
-0.1 days per decade
First autumn frost
8 October
n/a
8 October
n/a
-2.7 days per decade
Growing days
157 days
n/a
157 days
n/a
-2.7 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
30 years, 1968 to 2000
A day with at least 66.4 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 236.8 mm (9.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Clarksville 3 NNE: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
66.4 mm (2.6 in)
5 years
89.9 mm (3.5 in)
10 years
111.8 mm (4.4 in)
25 years
149.8 mm (5.9 in)
50 years
187.9 mm (7.4 in)
Longer than the 30 years of record
100 years
236.8 mm (9.3 in)
Longer than the 30 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, 30 years of values from 1968 to 2000.
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: 231.9 mm (9.1 in) in 1972; 134.1 mm (5.3 in) in 1975; 121.9 mm (4.8 in) in 1996.
Download the Data
Data for Clarksville 3 NNE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Clarksville 3 NNE 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.