Record envelope, standing records and threshold days for Glenn Dale Bell STN (USC00183675), Maryland, United States, with 87 years of record.
Key Facts for Glenn Dale Bell STN
Glenn Dale Bell STN (USC00183675) is a weather station in Maryland, United States at 38.97 latitude and -76.80 longitude, 46 m (150 ft) above sea level.
The station reports from 1921 to 2007, 87 years of record.
1,464 records set at Glenn Dale Bell STN still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Glenn Dale Bell STN set a daily record precipitation of 40.1 mm (1.6 in) on 14 May 2007.
About the Station
Location: Maryland, United States, 38.97 latitude, -76.80 longitude.
Elevation: 46 m (150 ft).
Period of record: 1921 to 2007, 87 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 Glenn Dale Bell STN. 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 Glenn Dale Bell STN, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
25.6 C (78.1 F)
-30.6 C (-23.1 F)
n/a
n/a
Feb
28.3 C (82.9 F)
-27.2 C (-17.0 F)
n/a
n/a
Mar
35.0 C (95.0 F)
-21.1 C (-6.0 F)
n/a
n/a
Apr
35.0 C (95.0 F)
-13.3 C (8.1 F)
n/a
n/a
May
36.7 C (98.1 F)
-4.4 C (24.1 F)
n/a
n/a
Jun
38.9 C (102.0 F)
0.0 C (32.0 F)
n/a
n/a
Jul
41.1 C (106.0 F)
4.4 C (39.9 F)
n/a
n/a
Aug
40.0 C (104.0 F)
3.3 C (37.9 F)
n/a
n/a
Sep
38.9 C (102.0 F)
-1.7 C (28.9 F)
n/a
n/a
Oct
35.6 C (96.1 F)
-8.9 C (16.0 F)
n/a
n/a
Nov
30.6 C (87.1 F)
-17.2 C (1.0 F)
n/a
n/a
Dec
26.1 C (79.0 F)
-27.2 C (-17.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Glenn Dale Bell STN still stand. 1930 holds the most, with 61.
Standing records at Glenn Dale Bell STN by the year they were set
Year set
Standing records
1921
19
1922
11
1923
21
1924
19
1925
38
1926
31
1927
22
1928
29
1929
35
1930
61
1931
19
1932
27
1933
19
1934
30
1935
14
1936
25
1937
17
1938
17
1939
20
1940
18
1941
21
1942
17
1943
23
1944
8
1945
13
1946
20
1947
19
1948
18
1949
9
1950
16
1951
14
1952
8
1953
11
1954
30
1955
11
1956
11
1957
15
1958
12
1959
14
1960
22
1961
21
1962
10
1963
19
1964
29
1965
14
1966
14
1967
18
1968
11
1969
5
1970
7
1971
15
1972
16
1973
12
1974
17
1975
9
1976
17
1977
15
1978
10
1979
25
1980
11
1981
5
1982
12
1983
12
1984
16
1985
9
1986
10
1987
8
1988
20
1989
13
1990
24
1991
24
1992
10
1993
21
1994
18
1995
15
1996
14
1997
13
1998
16
1999
9
2000
12
2001
13
2002
22
2003
15
2004
12
2005
11
2006
6
2007
5
All-Time Record Progression
5 new records
5 all-time records were set at Glenn Dale Bell STN between 13 August 1955 and 24 July 1993. Each dot is a new record.
When Glenn Dale Bell STN set new all-time records
Date
Kind
Detail
1955-08-13
Record daily precipitation
Record daily precipitation 177.3 mm (7.0 in)
1970-01-09
Record low maximum temperature
Record low maximum temperature -10.6 C (12.9 F)
1975-08-03
Record high minimum temperature
Record high minimum temperature 26.1 C (79.0 F)
1993-07-04
Record high minimum temperature
Record high minimum temperature 26.7 C (80.1 F)
1993-07-24
Record high minimum temperature
Record high minimum temperature 27.8 C (82.0 F)
Wettest Day of Each Month
Aug: 177.3 mm (7.0 in)
The wettest day on record for each calendar month at Glenn Dale Bell STN. The most was 177.3 mm (7.0 in) on 13 August 1955.
Record daily precipitation for each month at Glenn Dale Bell STN
Month
Record daily precipitation (mm)
Date
Jan
61.0 mm (2.4 in)
28 January 1922
Feb
75.9 mm (3.0 in)
23 February 2003
Mar
86.1 mm (3.4 in)
20 March 1958
Apr
121.2 mm (4.8 in)
26 April 1937
May
131.6 mm (5.2 in)
26 May 1997
Jun
149.1 mm (5.9 in)
20 June 1983
Jul
97.5 mm (3.8 in)
27 July 1988
Aug
177.3 mm (7.0 in)
13 August 1955
Sep
121.4 mm (4.8 in)
2 September 2006
Oct
147.3 mm (5.8 in)
9 October 2005
Nov
98.0 mm (3.9 in)
13 November 1937
Dec
60.5 mm (2.4 in)
18 December 1977
Period of Record Coverage
1921 to 2007
Complete yearUnder 90 percent of days
87 years of record at Glenn Dale Bell STN, 1921 to 2007. 5 years have data for under 90 percent of days and are left out of rankings: 1988, 1997, 1998, 2006, 2007.
Cooler than the station meanWarmer than the station mean
One stripe for each of 82 complete years at Glenn Dale Bell STN, 1921 to 2005. Blue stripes are years cooler than the station's own mean of 12.7 C (54.9 F); red stripes are warmer. The coolest year was 1940, at 11.4 C (52.4 F), and the warmest was 1991, at 14.3 C (57.8 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Glenn Dale Bell STN as warming stripes, 1921 to 2005
Year
Annual mean temperature
Difference from the station mean
1921
13.9 C
+1.17 C
1922
12.6 C
-0.16 C
1923
12.5 C
-0.27 C
1924
11.5 C
-1.24 C
1925
12.4 C
-0.36 C
1926
11.5 C
-1.25 C
1928
11.9 C
-0.83 C
1929
12.3 C
-0.41 C
1930
12.7 C
-0.01 C
1931
13.2 C
+0.49 C
1932
12.7 C
+0.01 C
1933
12.9 C
+0.13 C
1934
12.3 C
-0.41 C
1935
12.2 C
-0.55 C
1936
12.4 C
-0.31 C
1937
12.7 C
0.00 C
1938
13.1 C
+0.40 C
1939
13.0 C
+0.32 C
1940
11.4 C
-1.36 C
1941
12.8 C
+0.03 C
1942
12.9 C
+0.18 C
1943
12.8 C
+0.03 C
1944
12.7 C
-0.03 C
1945
12.9 C
+0.20 C
1946
13.4 C
+0.68 C
1947
12.5 C
-0.26 C
1948
12.7 C
-0.06 C
1949
13.9 C
+1.20 C
1950
12.6 C
-0.12 C
1951
12.8 C
+0.09 C
1952
12.9 C
+0.21 C
1953
13.6 C
+0.83 C
1954
13.2 C
+0.48 C
1955
13.0 C
+0.31 C
1956
13.0 C
+0.25 C
1957
13.3 C
+0.53 C
1958
11.8 C
-0.89 C
1959
13.4 C
+0.65 C
1960
12.0 C
-0.75 C
1961
12.4 C
-0.35 C
1962
12.2 C
-0.53 C
1963
12.2 C
-0.56 C
1964
12.9 C
+0.21 C
1965
12.8 C
+0.06 C
1966
12.4 C
-0.35 C
1967
12.1 C
-0.62 C
1968
12.3 C
-0.42 C
1969
12.5 C
-0.19 C
1970
12.8 C
+0.10 C
1971
13.0 C
+0.32 C
1972
12.6 C
-0.13 C
1973
13.7 C
+0.95 C
1974
13.3 C
+0.58 C
1975
13.4 C
+0.72 C
1976
12.5 C
-0.26 C
1977
12.8 C
+0.09 C
1978
12.0 C
-0.72 C
1979
12.3 C
-0.43 C
1980
12.5 C
-0.21 C
1981
12.4 C
-0.32 C
1982
12.5 C
-0.26 C
1983
12.6 C
-0.09 C
1984
12.8 C
+0.09 C
1985
13.2 C
+0.47 C
1986
12.8 C
+0.11 C
1987
13.1 C
+0.36 C
1989
12.3 C
-0.40 C
1990
14.2 C
+1.44 C
1991
14.3 C
+1.61 C
1992
12.7 C
-0.07 C
1993
12.6 C
-0.15 C
1994
13.4 C
+0.70 C
1995
13.9 C
+1.17 C
1996
12.9 C
+0.18 C
1997
13.0 C
+0.26 C
1999
12.9 C
+0.21 C
2000
11.9 C
-0.79 C
2001
12.6 C
-0.17 C
2002
13.1 C
+0.37 C
2003
11.4 C
-1.29 C
2004
12.6 C
-0.15 C
2005
12.6 C
-0.14 C
The fitted trend in annual mean temperature here over 1921 to 2005 is 0.04 C (-0.02 to 0.09) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.06 F (-0.03 to 0.16) per decade. The slope is a straight line fitted to 82 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Glenn Dale Bell STN
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.04 C (-0.02 to 0.09) per decade
0.06 F (-0.03 to 0.16) per decade
1921 to 2005
82
Not clearly different from zero
Mean daily maximum
0.02 C (-0.05 to 0.09) per decade
0.04 F (-0.08 to 0.17) per decade
1921 to 2005
82
Not clearly different from zero
Mean daily minimum
0.05 C (-0.01 to 0.10) per decade
0.09 F (-0.01 to 0.18) per decade
1921 to 2005
82
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
1921 to 2007
Yearly extremes at Glenn Dale Bell STN: 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)
1936
36.7 C (98.1 F)
87
Coldest night (TNn)
-30.6 C (-23.1 F)
1935
-17.2 C (1.0 F)
87
Wettest day (Rx1day)
177.3 mm (7.0 in)
1955
70.4 mm (2.8 in)
87
Wettest five days (Rx5day)
254.6 mm (10.0 in)
1955
105.4 mm (4.1 in)
87
Longest dry spell (CDD)
33 days
2001
18 days
87
Hottest day (TXx)
The hottest day of the year at Glenn Dale Bell STN, 1921 to 2007. The record is 41.1 C (106.0 F) in 1936, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Glenn Dale Bell STN by year
Year
Hottest day (TXx)
1921
36.1 C (97.0 F)
1922
34.4 C (93.9 F)
1923
35.0 C (95.0 F)
1924
37.8 C (100.0 F)
1925
38.3 C (100.9 F)
1926
39.4 C (102.9 F)
1927
35.0 C (95.0 F)
1928
37.2 C (99.0 F)
1929
37.2 C (99.0 F)
1930
40.6 C (105.1 F)
1931
37.2 C (99.0 F)
1932
37.2 C (99.0 F)
1933
37.8 C (100.0 F)
1934
38.3 C (100.9 F)
1935
36.1 C (97.0 F)
1936
41.1 C (106.0 F)
1937
36.1 C (97.0 F)
1938
37.2 C (99.0 F)
1939
37.2 C (99.0 F)
1940
37.8 C (100.0 F)
1941
36.7 C (98.1 F)
1942
36.7 C (98.1 F)
1943
37.2 C (99.0 F)
1944
37.2 C (99.0 F)
1945
36.7 C (98.1 F)
1946
36.1 C (97.0 F)
1947
35.0 C (95.0 F)
1948
37.8 C (100.0 F)
1949
37.2 C (99.0 F)
1950
33.9 C (93.0 F)
1951
35.0 C (95.0 F)
1952
37.2 C (99.0 F)
1953
38.3 C (100.9 F)
1954
39.4 C (102.9 F)
1955
37.8 C (100.0 F)
1956
35.6 C (96.1 F)
1957
38.3 C (100.9 F)
1958
34.4 C (93.9 F)
1959
37.2 C (99.0 F)
1960
34.4 C (93.9 F)
1961
35.0 C (95.0 F)
1962
36.7 C (98.1 F)
1963
36.1 C (97.0 F)
1964
36.7 C (98.1 F)
1965
35.0 C (95.0 F)
1966
37.8 C (100.0 F)
1967
34.4 C (93.9 F)
1968
35.6 C (96.1 F)
1969
36.1 C (97.0 F)
1970
35.6 C (96.1 F)
1971
33.9 C (93.0 F)
1972
35.6 C (96.1 F)
1973
36.1 C (97.0 F)
1974
34.4 C (93.9 F)
1975
36.1 C (97.0 F)
1976
35.0 C (95.0 F)
1977
36.7 C (98.1 F)
1978
36.1 C (97.0 F)
1979
34.4 C (93.9 F)
1980
37.2 C (99.0 F)
1981
35.0 C (95.0 F)
1982
35.6 C (96.1 F)
1983
38.9 C (102.0 F)
1984
36.7 C (98.1 F)
1985
36.1 C (97.0 F)
1986
36.7 C (98.1 F)
1987
37.2 C (99.0 F)
1988
38.9 C (102.0 F)
1989
35.6 C (96.1 F)
1990
37.8 C (100.0 F)
1991
37.8 C (100.0 F)
1992
35.6 C (96.1 F)
1993
36.7 C (98.1 F)
1994
38.9 C (102.0 F)
1995
38.9 C (102.0 F)
1996
36.1 C (97.0 F)
1997
40.0 C (104.0 F)
1998
36.7 C (98.1 F)
1999
38.9 C (102.0 F)
2000
35.0 C (95.0 F)
2001
36.1 C (97.0 F)
2002
37.8 C (100.0 F)
2003
35.6 C (96.1 F)
2004
33.9 C (93.0 F)
2005
36.7 C (98.1 F)
2006
36.7 C (98.1 F)
2007
32.8 C (91.0 F)
Coldest night (TNn)
The coldest night of the year at Glenn Dale Bell STN, 1921 to 2007. The record is -30.6 C (-23.1 F) in 1935, marked on the chart; the median year is -17.2 C (1.0 F).
Coldest night (TNn) at Glenn Dale Bell STN by year
Year
Coldest night (TNn)
1921
-15.0 C (5.0 F)
1922
-17.2 C (1.0 F)
1923
-15.6 C (3.9 F)
1924
-15.0 C (5.0 F)
1925
-16.7 C (1.9 F)
1926
-18.9 C (-2.0 F)
1927
-14.4 C (6.1 F)
1928
-22.8 C (-9.0 F)
1929
-16.7 C (1.9 F)
1930
-21.7 C (-7.1 F)
1931
-15.0 C (5.0 F)
1932
-18.9 C (-2.0 F)
1933
-15.6 C (3.9 F)
1934
-27.2 C (-17.0 F)
1935
-30.6 C (-23.1 F)
1936
-27.2 C (-17.0 F)
1937
-14.4 C (6.1 F)
1938
-16.7 C (1.9 F)
1939
-18.3 C (-0.9 F)
1940
-22.2 C (-8.0 F)
1941
-13.3 C (8.1 F)
1942
-27.2 C (-17.0 F)
1943
-18.3 C (-0.9 F)
1944
-13.3 C (8.1 F)
1945
-20.0 C (-4.0 F)
1946
-20.0 C (-4.0 F)
1947
-19.4 C (-2.9 F)
1948
-22.8 C (-9.0 F)
1949
-13.3 C (8.1 F)
1950
-13.9 C (7.0 F)
1951
-18.3 C (-0.9 F)
1952
-13.9 C (7.0 F)
1953
-12.8 C (9.0 F)
1954
-18.3 C (-0.9 F)
1955
-17.8 C (0.0 F)
1956
-13.9 C (7.0 F)
1957
-23.3 C (-9.9 F)
1958
-16.7 C (1.9 F)
1959
-18.9 C (-2.0 F)
1960
-21.1 C (-6.0 F)
1961
-23.3 C (-9.9 F)
1962
-20.0 C (-4.0 F)
1963
-21.1 C (-6.0 F)
1964
-22.8 C (-9.0 F)
1965
-20.6 C (-5.1 F)
1966
-19.4 C (-2.9 F)
1967
-22.2 C (-8.0 F)
1968
-22.2 C (-8.0 F)
1969
-15.6 C (3.9 F)
1970
-16.7 C (1.9 F)
1971
-15.0 C (5.0 F)
1972
-17.2 C (1.0 F)
1973
-15.0 C (5.0 F)
1974
-17.2 C (1.0 F)
1975
-14.4 C (6.1 F)
1976
-17.2 C (1.0 F)
1977
-20.0 C (-4.0 F)
1978
-16.1 C (3.0 F)
1979
-23.3 C (-9.9 F)
1980
-17.8 C (0.0 F)
1981
-20.6 C (-5.1 F)
1982
-22.2 C (-8.0 F)
1983
-18.3 C (-0.9 F)
1984
-22.2 C (-8.0 F)
1985
-22.2 C (-8.0 F)
1986
-14.4 C (6.1 F)
1987
-23.9 C (-11.0 F)
1988
-20.6 C (-5.1 F)
1989
-17.8 C (0.0 F)
1990
-12.8 C (9.0 F)
1991
-13.9 C (7.0 F)
1992
-13.9 C (7.0 F)
1993
-16.7 C (1.9 F)
1994
-23.3 C (-9.9 F)
1995
-16.1 C (3.0 F)
1996
-23.3 C (-9.9 F)
1997
-14.4 C (6.1 F)
1998
-11.7 C (10.9 F)
1999
-15.6 C (3.9 F)
2000
-16.7 C (1.9 F)
2001
-12.2 C (10.0 F)
2002
-16.7 C (1.9 F)
2003
-16.7 C (1.9 F)
2004
-15.0 C (5.0 F)
2005
-16.7 C (1.9 F)
2006
-12.8 C (9.0 F)
2007
-13.9 C (7.0 F)
Wettest day (Rx1day)
The wettest day of the year at Glenn Dale Bell STN, 1921 to 2007. The record is 177.3 mm (7.0 in) in 1955, marked on the chart; the median year is 70.4 mm (2.8 in).
Wettest day (Rx1day) at Glenn Dale Bell STN by year
Year
Wettest day (Rx1day)
1921
70.1 mm (2.8 in)
1922
64.3 mm (2.5 in)
1923
98.8 mm (3.9 in)
1924
68.8 mm (2.7 in)
1925
36.8 mm (1.4 in)
1926
62.7 mm (2.5 in)
1927
52.1 mm (2.1 in)
1928
153.7 mm (6.1 in)
1929
58.9 mm (2.3 in)
1930
38.1 mm (1.5 in)
1931
59.2 mm (2.3 in)
1932
85.1 mm (3.4 in)
1933
144.8 mm (5.7 in)
1934
68.6 mm (2.7 in)
1935
106.7 mm (4.2 in)
1936
51.1 mm (2.0 in)
1937
121.2 mm (4.8 in)
1938
45.2 mm (1.8 in)
1939
86.4 mm (3.4 in)
1940
86.9 mm (3.4 in)
1941
69.3 mm (2.7 in)
1942
122.9 mm (4.8 in)
1943
87.9 mm (3.5 in)
1944
118.9 mm (4.7 in)
1945
92.5 mm (3.6 in)
1946
49.5 mm (1.9 in)
1947
93.0 mm (3.7 in)
1948
87.6 mm (3.4 in)
1949
37.1 mm (1.5 in)
1950
51.3 mm (2.0 in)
1951
54.1 mm (2.1 in)
1952
108.0 mm (4.3 in)
1953
88.9 mm (3.5 in)
1954
52.1 mm (2.1 in)
1955
177.3 mm (7.0 in)
1956
77.5 mm (3.1 in)
1957
58.4 mm (2.3 in)
1958
89.9 mm (3.5 in)
1959
76.7 mm (3.0 in)
1960
95.3 mm (3.8 in)
1961
52.3 mm (2.1 in)
1962
48.8 mm (1.9 in)
1963
80.0 mm (3.1 in)
1964
54.6 mm (2.1 in)
1965
70.4 mm (2.8 in)
1966
105.9 mm (4.2 in)
1967
59.7 mm (2.4 in)
1968
66.3 mm (2.6 in)
1969
82.3 mm (3.2 in)
1970
62.2 mm (2.4 in)
1971
120.1 mm (4.7 in)
1972
94.0 mm (3.7 in)
1973
60.5 mm (2.4 in)
1974
56.1 mm (2.2 in)
1975
79.5 mm (3.1 in)
1976
95.0 mm (3.7 in)
1977
60.5 mm (2.4 in)
1978
56.4 mm (2.2 in)
1979
83.1 mm (3.3 in)
1980
43.2 mm (1.7 in)
1981
86.4 mm (3.4 in)
1982
51.1 mm (2.0 in)
1983
149.1 mm (5.9 in)
1984
45.2 mm (1.8 in)
1985
119.9 mm (4.7 in)
1986
73.2 mm (2.9 in)
1987
38.1 mm (1.5 in)
1988
97.5 mm (3.8 in)
1989
54.1 mm (2.1 in)
1990
59.4 mm (2.3 in)
1991
44.5 mm (1.8 in)
1992
74.9 mm (2.9 in)
1993
95.5 mm (3.8 in)
1994
82.8 mm (3.3 in)
1995
58.7 mm (2.3 in)
1996
86.4 mm (3.4 in)
1997
131.6 mm (5.2 in)
1998
55.1 mm (2.2 in)
1999
89.7 mm (3.5 in)
2000
52.1 mm (2.1 in)
2001
53.3 mm (2.1 in)
2002
63.2 mm (2.5 in)
2003
75.9 mm (3.0 in)
2004
58.7 mm (2.3 in)
2005
147.3 mm (5.8 in)
2006
121.4 mm (4.8 in)
2007
69.9 mm (2.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Glenn Dale Bell STN, 1921 to 2007. The record is 254.6 mm (10.0 in) in 1955, marked on the chart; the median year is 105.4 mm (4.1 in).
Wettest five days (Rx5day) at Glenn Dale Bell STN by year
Year
Wettest five days (Rx5day)
1921
154.4 mm (6.1 in)
1922
107.2 mm (4.2 in)
1923
102.9 mm (4.1 in)
1924
110.2 mm (4.3 in)
1925
64.0 mm (2.5 in)
1926
87.8 mm (3.5 in)
1927
78.5 mm (3.1 in)
1928
183.2 mm (7.2 in)
1929
91.7 mm (3.6 in)
1930
58.7 mm (2.3 in)
1931
95.6 mm (3.8 in)
1932
92.2 mm (3.6 in)
1933
249.9 mm (9.8 in)
1934
125.7 mm (4.9 in)
1935
209.6 mm (8.3 in)
1936
77.0 mm (3.0 in)
1937
163.9 mm (6.5 in)
1938
92.7 mm (3.6 in)
1939
101.9 mm (4.0 in)
1940
99.3 mm (3.9 in)
1941
78.4 mm (3.1 in)
1942
195.0 mm (7.7 in)
1943
114.0 mm (4.5 in)
1944
166.9 mm (6.6 in)
1945
138.5 mm (5.5 in)
1946
106.1 mm (4.2 in)
1947
107.2 mm (4.2 in)
1948
122.5 mm (4.8 in)
1949
76.8 mm (3.0 in)
1950
108.7 mm (4.3 in)
1951
105.4 mm (4.1 in)
1952
166.2 mm (6.5 in)
1953
113.0 mm (4.4 in)
1954
54.9 mm (2.2 in)
1955
254.6 mm (10.0 in)
1956
111.8 mm (4.4 in)
1957
72.7 mm (2.9 in)
1958
105.9 mm (4.2 in)
1959
118.7 mm (4.7 in)
1960
122.6 mm (4.8 in)
1961
85.6 mm (3.4 in)
1962
56.7 mm (2.2 in)
1963
136.2 mm (5.4 in)
1964
86.6 mm (3.4 in)
1965
94.5 mm (3.7 in)
1966
113.3 mm (4.5 in)
1967
107.6 mm (4.2 in)
1968
89.2 mm (3.5 in)
1969
97.6 mm (3.8 in)
1970
75.6 mm (3.0 in)
1971
168.4 mm (6.6 in)
1972
148.1 mm (5.8 in)
1973
73.1 mm (2.9 in)
1974
84.9 mm (3.3 in)
1975
229.2 mm (9.0 in)
1976
96.6 mm (3.8 in)
1977
107.0 mm (4.2 in)
1978
103.3 mm (4.1 in)
1979
133.1 mm (5.2 in)
1980
75.8 mm (3.0 in)
1981
94.0 mm (3.7 in)
1982
95.3 mm (3.8 in)
1983
208.8 mm (8.2 in)
1984
96.5 mm (3.8 in)
1985
128.5 mm (5.1 in)
1986
92.5 mm (3.6 in)
1987
61.7 mm (2.4 in)
1988
118.8 mm (4.7 in)
1989
94.2 mm (3.7 in)
1990
111.3 mm (4.4 in)
1991
73.0 mm (2.9 in)
1992
117.1 mm (4.6 in)
1993
95.5 mm (3.8 in)
1994
150.7 mm (5.9 in)
1995
81.0 mm (3.2 in)
1996
158.3 mm (6.2 in)
1997
132.9 mm (5.2 in)
1998
70.8 mm (2.8 in)
1999
151.7 mm (6.0 in)
2000
85.6 mm (3.4 in)
2001
94.7 mm (3.7 in)
2002
73.6 mm (2.9 in)
2003
129.5 mm (5.1 in)
2004
68.6 mm (2.7 in)
2005
162.7 mm (6.4 in)
2006
183.1 mm (7.2 in)
2007
97.8 mm (3.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Glenn Dale Bell STN, 1921 to 2007. The record is 33 days in 2001, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Glenn Dale Bell STN by year
Year
Longest dry spell (CDD)
1921
18 days
1922
24 days
1923
17 days
1924
27 days
1925
13 days
1926
15 days
1927
13 days
1928
14 days
1929
11 days
1930
25 days
1931
19 days
1932
16 days
1933
13 days
1934
19 days
1935
18 days
1936
22 days
1937
19 days
1938
16 days
1939
19 days
1940
28 days
1941
19 days
1942
23 days
1943
15 days
1944
16 days
1945
13 days
1946
21 days
1947
13 days
1948
10 days
1949
18 days
1950
15 days
1951
22 days
1952
22 days
1953
21 days
1954
17 days
1955
22 days
1956
16 days
1957
20 days
1958
23 days
1959
25 days
1960
13 days
1961
15 days
1962
24 days
1963
32 days
1964
29 days
1965
20 days
1966
19 days
1967
19 days
1968
25 days
1969
17 days
1970
18 days
1971
14 days
1972
11 days
1973
14 days
1974
18 days
1975
12 days
1976
17 days
1977
29 days
1978
14 days
1979
11 days
1980
16 days
1981
15 days
1982
16 days
1983
14 days
1984
17 days
1985
24 days
1986
20 days
1987
19 days
1988
21 days
1989
16 days
1990
13 days
1991
22 days
1992
17 days
1993
18 days
1994
16 days
1995
29 days
1996
11 days
1997
15 days
1998
20 days
1999
19 days
2000
32 days
2001
33 days
2002
19 days
2003
16 days
2004
17 days
2005
20 days
2006
21 days
2007
17 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
82 years with a frost
Across 82 years with a frost, the median last spring frost at Glenn Dale Bell STN falls on 1 May and the median first autumn frost on 10 October, which leaves a median of 164 days between them.
In 1974 to 2005 the median growing season was 170 days. That is 11 days more than in 1921 to 1951.
Fitted over all years, the growing season changes by +2.0 days per decade at this station.
Frost dates and growing season at Glenn Dale Bell STN
Measure
Median, all years
Earliest period (1921 to 1951)
Recent period (1974 to 2005)
Recent against earliest
Fitted trend
Last spring frost
1 May
2 May
29 April
3 days earlier
-1.1 days per decade
First autumn frost
10 October
11 October
13 October
2 days later
+0.9 days per decade
Growing days
164 days
159 days
170 days
11 days more
+2.0 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
82 years, 1922 to 2006
A day with at least 71.5 mm (2.8 in) of rain is expected about once in 2 years. A day with at least 183.3 mm (7.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Glenn Dale Bell STN: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
71.5 mm (2.8 in)
5 years
98.0 mm (3.9 in)
10 years
116.8 mm (4.6 in)
25 years
142.2 mm (5.6 in)
50 years
162.3 mm (6.4 in)
100 years
183.3 mm (7.2 in)
Longer than the 82 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, 82 years of values from 1922 to 2006.
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: 177.3 mm (7.0 in) in 1955; 153.7 mm (6.1 in) in 1928; 149.1 mm (5.9 in) in 1983.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Glenn Dale Bell STN standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Glenn Dale Bell STN 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.