Record envelope, standing records and threshold days for Keedysville (USC00184780), Maryland, United States, with 57 years of record.
Key Facts for Keedysville
Keedysville (USC00184780) is a weather station in Maryland, United States at 39.48 latitude and -77.70 longitude, 128 m (420 ft) above sea level.
The station reports from 1904 to 1960, 57 years of record.
1,464 records set at Keedysville still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Keedysville set a daily record snowfall of 10.2 cm (4.0 in) on 17 March 1960.
About the Station
Location: Maryland, United States, 39.48 latitude, -77.70 longitude.
Elevation: 128 m (420 ft).
Period of record: 1904 to 1960, 57 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 Keedysville. 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 Keedysville, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
26.7 C (80.1 F)
-32.2 C (-26.0 F)
n/a
n/a
Feb
26.1 C (79.0 F)
-28.3 C (-18.9 F)
n/a
n/a
Mar
32.8 C (91.0 F)
-20.6 C (-5.1 F)
n/a
n/a
Apr
36.1 C (97.0 F)
-12.2 C (10.0 F)
n/a
n/a
May
37.8 C (100.0 F)
-4.4 C (24.1 F)
n/a
n/a
Jun
40.0 C (104.0 F)
1.1 C (34.0 F)
n/a
n/a
Jul
41.7 C (107.1 F)
5.6 C (42.1 F)
n/a
n/a
Aug
42.8 C (109.0 F)
4.4 C (39.9 F)
n/a
n/a
Sep
40.6 C (105.1 F)
-2.8 C (27.0 F)
n/a
n/a
Oct
36.7 C (98.1 F)
-6.7 C (19.9 F)
n/a
n/a
Nov
29.4 C (84.9 F)
-20.0 C (-4.0 F)
n/a
n/a
Dec
23.9 C (75.0 F)
-26.1 C (-15.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Keedysville still stand. 1930 holds the most, with 57.
Standing records at Keedysville by the year they were set
Year set
Standing records
1904
2
1905
24
1906
20
1907
32
1908
21
1909
28
1910
25
1911
29
1912
24
1913
35
1914
38
1915
21
1916
26
1917
30
1918
46
1919
21
1920
25
1921
35
1922
22
1923
26
1924
25
1925
33
1926
31
1927
33
1928
27
1929
37
1930
57
1931
32
1932
30
1933
25
1934
33
1935
24
1936
39
1937
16
1938
20
1939
21
1940
27
1941
20
1942
29
1943
16
1944
9
1945
28
1946
21
1947
41
1948
23
1949
19
1950
23
1951
17
1952
12
1953
25
1954
29
1955
16
1956
29
1957
23
1958
14
1959
20
1960
10
All-Time Record Progression
1 new records
1 all-time records were set at Keedysville between 20 July 1956 and 20 July 1956. Each dot is a new record.
When Keedysville set new all-time records
Date
Kind
Detail
1956-07-20
Record daily precipitation
Record daily precipitation 144.8 mm (5.7 in)
Wettest Day of Each Month
Jul: 144.8 mm (5.7 in)
The wettest day on record for each calendar month at Keedysville. The most was 144.8 mm (5.7 in) on 20 July 1956.
Record daily precipitation for each month at Keedysville
Month
Record daily precipitation (mm)
Date
Jan
54.9 mm (2.2 in)
1 January 1948
Feb
47.8 mm (1.9 in)
20 February 1927
Mar
59.7 mm (2.4 in)
27 March 1913
Apr
85.9 mm (3.4 in)
26 April 1937
May
82.0 mm (3.2 in)
25 May 1952
Jun
80.0 mm (3.1 in)
2 June 1915
Jul
144.8 mm (5.7 in)
20 July 1956
Aug
86.4 mm (3.4 in)
31 August 1911
Sep
101.1 mm (4.0 in)
25 September 1940
Oct
112.8 mm (4.4 in)
22 October 1929
Nov
85.1 mm (3.4 in)
25 November 1950
Dec
84.3 mm (3.3 in)
1 December 1934
Period of Record Coverage
1904 to 1960
Complete yearUnder 90 percent of days
57 years of record at Keedysville, 1904 to 1960. 2 years have data for under 90 percent of days and are left out of rankings: 1904, 1960.
Cooler than the station meanWarmer than the station mean
One stripe for each of 54 complete years at Keedysville, 1905 to 1959. Blue stripes are years cooler than the station's own mean of 12.3 C (54.2 F); red stripes are warmer. The coolest year was 1917, at 10.7 C (51.2 F), and the warmest was 1953, at 13.7 C (56.7 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Keedysville as warming stripes, 1905 to 1959
Year
Annual mean temperature
Difference from the station mean
1905
11.9 C
-0.45 C
1906
12.6 C
+0.27 C
1907
11.2 C
-1.16 C
1908
12.4 C
+0.03 C
1909
12.1 C
-0.21 C
1910
12.1 C
-0.22 C
1911
12.9 C
+0.55 C
1912
11.5 C
-0.80 C
1913
13.0 C
+0.72 C
1914
11.5 C
-0.84 C
1915
12.1 C
-0.21 C
1916
11.8 C
-0.53 C
1917
10.7 C
-1.63 C
1918
12.0 C
-0.30 C
1919
12.5 C
+0.17 C
1920
11.4 C
-0.89 C
1921
13.7 C
+1.42 C
1922
12.7 C
+0.36 C
1923
12.3 C
-0.03 C
1924
11.2 C
-1.13 C
1925
12.3 C
-0.04 C
1926
11.6 C
-0.72 C
1927
12.6 C
+0.25 C
1928
12.2 C
-0.12 C
1929
12.4 C
+0.09 C
1930
13.1 C
+0.73 C
1931
13.5 C
+1.16 C
1932
13.1 C
+0.74 C
1933
12.5 C
+0.14 C
1934
12.4 C
+0.12 C
1935
12.1 C
-0.22 C
1936
12.1 C
-0.20 C
1937
11.9 C
-0.45 C
1938
12.7 C
+0.37 C
1939
12.6 C
+0.24 C
1940
10.9 C
-1.46 C
1942
12.3 C
-0.06 C
1943
12.1 C
-0.18 C
1944
12.3 C
-0.07 C
1945
12.1 C
-0.22 C
1946
13.5 C
+1.14 C
1947
12.5 C
+0.16 C
1948
12.4 C
+0.10 C
1949
13.4 C
+1.10 C
1950
12.0 C
-0.36 C
1951
12.6 C
+0.28 C
1952
12.7 C
+0.41 C
1953
13.7 C
+1.42 C
1954
13.0 C
+0.64 C
1955
12.5 C
+0.15 C
1956
11.8 C
-0.49 C
1957
12.9 C
+0.60 C
1958
11.3 C
-0.98 C
1959
12.9 C
+0.56 C
The annual mean temperature here has risen by 0.11 C (0.00 to 0.23) per decade over 1905 to 1959. In Fahrenheit: 0.21 F (0.00 to 0.41) per decade. The slope is a straight line fitted to 54 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Keedysville
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.11 C (0.00 to 0.23) per decade
0.21 F (0.00 to 0.41) per decade
1905 to 1959
54
Rise
Mean daily maximum
0.17 C (0.04 to 0.30) per decade
0.3 F (0.1 to 0.5) per decade
1905 to 1959
54
Rise
Mean daily minimum
0.1 C (-0.1 to 0.2) per decade
0.1 F (-0.1 to 0.3) per decade
1905 to 1959
54
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
1904 to 1960
Yearly extremes at Keedysville: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.8 C (109.0 F)
1918
37.8 C (100.0 F)
57
Coldest night (TNn)
-32.2 C (-26.0 F)
1912
-20.0 C (-4.0 F)
57
Wettest day (Rx1day)
144.8 mm (5.7 in)
1956
54.9 mm (2.2 in)
57
Wettest five days (Rx5day)
180.9 mm (7.1 in)
1949
87.4 mm (3.4 in)
57
Longest dry spell (CDD)
35 days
1947
19 days
57
Hottest day (TXx)
The hottest day of the year at Keedysville, 1904 to 1960. The record is 42.8 C (109.0 F) in 1918, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at Keedysville by year
Year
Hottest day (TXx)
1904
20.6 C (69.1 F)
1905
36.7 C (98.1 F)
1906
35.6 C (96.1 F)
1907
33.9 C (93.0 F)
1908
37.8 C (100.0 F)
1909
36.7 C (98.1 F)
1910
36.1 C (97.0 F)
1911
40.6 C (105.1 F)
1912
35.6 C (96.1 F)
1913
38.3 C (100.9 F)
1914
37.2 C (99.0 F)
1915
36.1 C (97.0 F)
1916
37.2 C (99.0 F)
1917
37.8 C (100.0 F)
1918
42.8 C (109.0 F)
1919
39.4 C (102.9 F)
1920
35.6 C (96.1 F)
1921
37.8 C (100.0 F)
1922
36.1 C (97.0 F)
1923
37.8 C (100.0 F)
1924
39.4 C (102.9 F)
1925
40.0 C (104.0 F)
1926
41.7 C (107.1 F)
1927
37.2 C (99.0 F)
1928
35.6 C (96.1 F)
1929
37.8 C (100.0 F)
1930
42.2 C (108.0 F)
1931
37.8 C (100.0 F)
1932
39.4 C (102.9 F)
1933
38.3 C (100.9 F)
1934
40.6 C (105.1 F)
1935
38.3 C (100.9 F)
1936
41.7 C (107.1 F)
1937
36.7 C (98.1 F)
1938
36.1 C (97.0 F)
1939
36.1 C (97.0 F)
1940
37.8 C (100.0 F)
1941
39.4 C (102.9 F)
1942
37.8 C (100.0 F)
1943
38.9 C (102.0 F)
1944
38.9 C (102.0 F)
1945
36.1 C (97.0 F)
1946
36.1 C (97.0 F)
1947
37.2 C (99.0 F)
1948
38.9 C (102.0 F)
1949
40.6 C (105.1 F)
1950
36.1 C (97.0 F)
1951
37.8 C (100.0 F)
1952
39.4 C (102.9 F)
1953
41.7 C (107.1 F)
1954
40.6 C (105.1 F)
1955
39.4 C (102.9 F)
1956
37.8 C (100.0 F)
1957
40.6 C (105.1 F)
1958
35.0 C (95.0 F)
1959
39.4 C (102.9 F)
1960
26.1 C (79.0 F)
Coldest night (TNn)
The coldest night of the year at Keedysville, 1904 to 1960. The record is -32.2 C (-26.0 F) in 1912, marked on the chart; the median year is -20.0 C (-4.0 F).
Coldest night (TNn) at Keedysville by year
Year
Coldest night (TNn)
1904
-22.2 C (-8.0 F)
1905
-22.8 C (-9.0 F)
1906
-20.6 C (-5.1 F)
1907
-26.7 C (-16.1 F)
1908
-21.1 C (-6.0 F)
1909
-18.3 C (-0.9 F)
1910
-21.1 C (-6.0 F)
1911
-16.1 C (3.0 F)
1912
-32.2 C (-26.0 F)
1913
-12.8 C (9.0 F)
1914
-27.8 C (-18.0 F)
1915
-12.8 C (9.0 F)
1916
-20.0 C (-4.0 F)
1917
-22.2 C (-8.0 F)
1918
-25.0 C (-13.0 F)
1919
-22.8 C (-9.0 F)
1920
-17.2 C (1.0 F)
1921
-21.7 C (-7.1 F)
1922
-20.0 C (-4.0 F)
1923
-13.9 C (7.0 F)
1924
-17.8 C (0.0 F)
1925
-29.4 C (-20.9 F)
1926
-19.4 C (-2.9 F)
1927
-14.4 C (6.1 F)
1928
-16.7 C (1.9 F)
1929
-15.6 C (3.9 F)
1930
-23.3 C (-9.9 F)
1931
-12.8 C (9.0 F)
1932
-19.4 C (-2.9 F)
1933
-18.3 C (-0.9 F)
1934
-28.3 C (-18.9 F)
1935
-27.8 C (-18.0 F)
1936
-26.7 C (-16.1 F)
1937
-14.4 C (6.1 F)
1938
-20.0 C (-4.0 F)
1939
-17.8 C (0.0 F)
1940
-21.1 C (-6.0 F)
1941
-13.3 C (8.1 F)
1942
-26.1 C (-15.0 F)
1943
-18.3 C (-0.9 F)
1944
-15.0 C (5.0 F)
1945
-20.0 C (-4.0 F)
1946
-20.0 C (-4.0 F)
1947
-15.6 C (3.9 F)
1948
-26.1 C (-15.0 F)
1949
-17.8 C (0.0 F)
1950
-15.0 C (5.0 F)
1951
-23.3 C (-9.9 F)
1952
-13.3 C (8.1 F)
1953
-11.1 C (12.0 F)
1954
-18.3 C (-0.9 F)
1955
-16.7 C (1.9 F)
1956
-15.0 C (5.0 F)
1957
-22.2 C (-8.0 F)
1958
-17.2 C (1.0 F)
1959
-23.3 C (-9.9 F)
1960
-20.6 C (-5.1 F)
Wettest day (Rx1day)
The wettest day of the year at Keedysville, 1904 to 1960. The record is 144.8 mm (5.7 in) in 1956, marked on the chart; the median year is 54.9 mm (2.2 in).
Wettest day (Rx1day) at Keedysville by year
Year
Wettest day (Rx1day)
1904
19.1 mm (0.8 in)
1905
78.0 mm (3.1 in)
1906
57.4 mm (2.3 in)
1907
47.2 mm (1.9 in)
1908
43.7 mm (1.7 in)
1909
50.8 mm (2.0 in)
1910
34.3 mm (1.4 in)
1911
86.4 mm (3.4 in)
1912
64.5 mm (2.5 in)
1913
59.7 mm (2.4 in)
1914
38.6 mm (1.5 in)
1915
80.0 mm (3.1 in)
1916
35.6 mm (1.4 in)
1917
87.4 mm (3.4 in)
1918
44.2 mm (1.7 in)
1919
71.6 mm (2.8 in)
1920
32.3 mm (1.3 in)
1921
48.3 mm (1.9 in)
1922
67.6 mm (2.7 in)
1923
57.9 mm (2.3 in)
1924
50.8 mm (2.0 in)
1925
41.9 mm (1.6 in)
1926
71.6 mm (2.8 in)
1927
62.2 mm (2.4 in)
1928
49.5 mm (1.9 in)
1929
112.8 mm (4.4 in)
1930
53.6 mm (2.1 in)
1931
77.5 mm (3.1 in)
1932
60.7 mm (2.4 in)
1933
93.5 mm (3.7 in)
1934
84.3 mm (3.3 in)
1935
49.3 mm (1.9 in)
1936
49.3 mm (1.9 in)
1937
85.9 mm (3.4 in)
1938
44.5 mm (1.8 in)
1939
48.3 mm (1.9 in)
1940
101.1 mm (4.0 in)
1941
50.8 mm (2.0 in)
1942
58.9 mm (2.3 in)
1943
44.7 mm (1.8 in)
1944
47.5 mm (1.9 in)
1945
53.3 mm (2.1 in)
1946
74.2 mm (2.9 in)
1947
37.6 mm (1.5 in)
1948
54.9 mm (2.2 in)
1949
108.2 mm (4.3 in)
1950
85.1 mm (3.4 in)
1951
55.1 mm (2.2 in)
1952
82.0 mm (3.2 in)
1953
44.7 mm (1.8 in)
1954
101.6 mm (4.0 in)
1955
64.8 mm (2.6 in)
1956
144.8 mm (5.7 in)
1957
43.9 mm (1.7 in)
1958
44.7 mm (1.8 in)
1959
40.6 mm (1.6 in)
1960
39.9 mm (1.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Keedysville, 1904 to 1960. The record is 180.9 mm (7.1 in) in 1949, marked on the chart; the median year is 87.4 mm (3.4 in).
Wettest five days (Rx5day) at Keedysville by year
Year
Wettest five days (Rx5day)
1904
30.2 mm (1.2 in)
1905
88.9 mm (3.5 in)
1906
100.4 mm (4.0 in)
1907
69.9 mm (2.8 in)
1908
72.1 mm (2.8 in)
1909
81.8 mm (3.2 in)
1910
65.4 mm (2.6 in)
1911
148.6 mm (5.9 in)
1912
106.2 mm (4.2 in)
1913
83.0 mm (3.3 in)
1914
62.6 mm (2.5 in)
1915
99.3 mm (3.9 in)
1916
68.9 mm (2.7 in)
1917
109.0 mm (4.3 in)
1918
105.6 mm (4.2 in)
1919
95.7 mm (3.8 in)
1920
63.8 mm (2.5 in)
1921
94.0 mm (3.7 in)
1922
103.7 mm (4.1 in)
1923
83.0 mm (3.3 in)
1924
106.8 mm (4.2 in)
1925
53.3 mm (2.1 in)
1926
122.2 mm (4.8 in)
1927
117.1 mm (4.6 in)
1928
72.8 mm (2.9 in)
1929
121.9 mm (4.8 in)
1930
75.9 mm (3.0 in)
1931
85.8 mm (3.4 in)
1932
108.7 mm (4.3 in)
1933
124.8 mm (4.9 in)
1934
109.8 mm (4.3 in)
1935
79.9 mm (3.1 in)
1936
63.5 mm (2.5 in)
1937
133.3 mm (5.2 in)
1938
70.1 mm (2.8 in)
1939
111.2 mm (4.4 in)
1940
104.1 mm (4.1 in)
1941
58.7 mm (2.3 in)
1942
112.7 mm (4.4 in)
1943
64.0 mm (2.5 in)
1944
65.3 mm (2.6 in)
1945
104.1 mm (4.1 in)
1946
85.0 mm (3.3 in)
1947
58.6 mm (2.3 in)
1948
87.4 mm (3.4 in)
1949
180.9 mm (7.1 in)
1950
99.1 mm (3.9 in)
1951
84.0 mm (3.3 in)
1952
118.8 mm (4.7 in)
1953
62.2 mm (2.4 in)
1954
108.5 mm (4.3 in)
1955
148.4 mm (5.8 in)
1956
167.4 mm (6.6 in)
1957
77.6 mm (3.1 in)
1958
71.9 mm (2.8 in)
1959
48.8 mm (1.9 in)
1960
45.2 mm (1.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Keedysville, 1904 to 1960. The record is 35 days in 1947, marked on the chart; the median year is 19 days.
Longest dry spell (CDD) at Keedysville by year
Year
Longest dry spell (CDD)
1904
20 days
1905
13 days
1906
28 days
1907
18 days
1908
21 days
1909
16 days
1910
22 days
1911
16 days
1912
22 days
1913
21 days
1914
21 days
1915
22 days
1916
15 days
1917
22 days
1918
16 days
1919
14 days
1920
26 days
1921
15 days
1922
25 days
1923
24 days
1924
27 days
1925
13 days
1926
20 days
1927
15 days
1928
14 days
1929
12 days
1930
28 days
1931
19 days
1932
15 days
1933
11 days
1934
19 days
1935
13 days
1936
15 days
1937
16 days
1938
14 days
1939
18 days
1940
14 days
1941
20 days
1942
25 days
1943
18 days
1944
25 days
1945
14 days
1946
18 days
1947
35 days
1948
13 days
1949
20 days
1950
19 days
1951
21 days
1952
29 days
1953
22 days
1954
16 days
1955
27 days
1956
15 days
1957
20 days
1958
23 days
1959
18 days
1960
12 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
54 years with a frost
Across 54 years with a frost, the median last spring frost at Keedysville falls on 29 April and the median first autumn frost on 12 October, which leaves a median of 165 days between them.
Fitted over all years, the growing season changes by -1.1 days per decade at this station.
Frost dates and growing season at Keedysville
Measure
Median, all years
Earliest period
Recent period (1929 to 1959)
Recent against earliest
Fitted trend
Last spring frost
29 April
n/a
28 April
n/a
-1.1 days per decade
First autumn frost
12 October
n/a
7 October
n/a
-2.2 days per decade
Growing days
165 days
n/a
163 days
n/a
-1.1 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
55 years, 1905 to 1959
A day with at least 57.5 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 149.7 mm (5.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Keedysville: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
57.5 mm (2.3 in)
5 years
77.5 mm (3.1 in)
10 years
92.5 mm (3.6 in)
25 years
113.5 mm (4.5 in)
50 years
130.9 mm (5.2 in)
100 years
149.7 mm (5.9 in)
Longer than the 55 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, 55 years of values from 1905 to 1959.
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: 144.8 mm (5.7 in) in 1956; 112.8 mm (4.4 in) in 1929; 108.2 mm (4.3 in) in 1949.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Keedysville standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Keedysville 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.