Record envelope, standing records and threshold days for Clear Spring 1 ENE (USC00181890), Maryland, United States, with 62 years of record.
Key Facts for Clear Spring 1 ENE
Clear Spring 1 ENE (USC00181890) is a weather station in Maryland, United States at 39.67 latitude and -77.90 longitude, 177 m (581 ft) above sea level.
The station reports from 1899 to 1960, 62 years of record.
1,464 records set at Clear Spring 1 ENE still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Clear Spring 1 ENE tied a daily record low maximum temperature of -3.3 C (26.1 F) on 29 December 1960.
About the Station
Location: Maryland, United States, 39.67 latitude, -77.90 longitude.
Elevation: 177 m (581 ft).
Period of record: 1899 to 1960, 62 years.
Eligible elements: tmax, tmin, prcp.
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 Clear Spring 1 ENE. 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 Clear Spring 1 ENE, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
27.2 C (81.0 F)
-23.3 C (-9.9 F)
n/a
n/a
Feb
25.0 C (77.0 F)
-23.9 C (-11.0 F)
n/a
n/a
Mar
32.2 C (90.0 F)
-15.0 C (5.0 F)
n/a
n/a
Apr
34.4 C (93.9 F)
-7.8 C (18.0 F)
n/a
n/a
May
36.1 C (97.0 F)
-1.1 C (30.0 F)
n/a
n/a
Jun
38.9 C (102.0 F)
0.6 C (33.1 F)
n/a
n/a
Jul
40.6 C (105.1 F)
5.6 C (42.1 F)
n/a
n/a
Aug
41.1 C (106.0 F)
4.4 C (39.9 F)
n/a
n/a
Sep
38.3 C (100.9 F)
-1.1 C (30.0 F)
n/a
n/a
Oct
35.0 C (95.0 F)
-7.2 C (19.0 F)
n/a
n/a
Nov
28.9 C (84.0 F)
-15.0 C (5.0 F)
n/a
n/a
Dec
23.3 C (73.9 F)
-23.9 C (-11.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Clear Spring 1 ENE still stand. 1930 holds the most, with 70.
Standing records at Clear Spring 1 ENE by the year they were set
Year set
Standing records
1899
17
1900
43
1901
22
1902
25
1903
31
1904
33
1905
21
1906
32
1907
36
1908
29
1909
29
1910
28
1911
33
1912
26
1913
21
1914
51
1915
26
1916
26
1917
47
1918
22
1923
12
1924
24
1925
53
1926
33
1927
48
1928
21
1929
48
1930
70
1931
1
1932
20
1933
22
1934
18
1935
15
1936
14
1937
4
1938
6
1941
21
1942
17
1944
24
1945
41
1946
7
1947
36
1948
26
1949
39
1950
32
1951
24
1952
19
1953
24
1954
33
1955
17
1956
28
1957
18
1958
7
1959
20
1960
24
All-Time Record Progression
1 new records
1 all-time records were set at Clear Spring 1 ENE between 22 July 1953 and 22 July 1953. Each dot is a new record.
When Clear Spring 1 ENE set new all-time records
Date
Kind
Detail
1953-07-22
Record daily precipitation
Record daily precipitation 178.1 mm (7.0 in)
Wettest Day of Each Month
Jul: 178.1 mm (7.0 in)
The wettest day on record for each calendar month at Clear Spring 1 ENE. The most was 178.1 mm (7.0 in) on 22 July 1953.
Record daily precipitation for each month at Clear Spring 1 ENE
Month
Record daily precipitation (mm)
Date
Jan
57.2 mm (2.3 in)
1 January 1948
Feb
62.2 mm (2.4 in)
2 February 1915
Mar
78.7 mm (3.1 in)
29 March 1942
Apr
148.3 mm (5.8 in)
26 April 1937
May
97.8 mm (3.9 in)
22 May 1901
Jun
108.7 mm (4.3 in)
29 June 1948
Jul
178.1 mm (7.0 in)
22 July 1953
Aug
81.3 mm (3.2 in)
19 August 1941
Sep
84.1 mm (3.3 in)
18 September 1945
Oct
113.8 mm (4.5 in)
22 October 1929
Nov
114.6 mm (4.5 in)
21 November 1952
Dec
66.0 mm (2.6 in)
14 December 1909
Period of Record Coverage
1899 to 1960
Complete yearUnder 90 percent of days
55 years of record at Clear Spring 1 ENE, 1899 to 1960. 18 years have data for under 90 percent of days and are left out of rankings: 1899, 1900, 1904, 1913, 1918, 1923, 1928, 1931 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 33 complete years at Clear Spring 1 ENE, 1901 to 1960. Blue stripes are years cooler than the station's own mean of 11.6 C (52.8 F); red stripes are warmer. The coolest year was 1917, at 9.5 C (49.1 F), and the warmest was 1953, at 13.4 C (56.1 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Clear Spring 1 ENE as warming stripes, 1901 to 1960
Year
Annual mean temperature
Difference from the station mean
1901
10.5 C
-1.07 C
1902
11.1 C
-0.48 C
1903
10.9 C
-0.70 C
1906
11.1 C
-0.45 C
1907
9.7 C
-1.92 C
1908
11.3 C
-0.27 C
1909
11.1 C
-0.46 C
1910
11.5 C
-0.10 C
1911
11.4 C
-0.18 C
1912
10.4 C
-1.22 C
1914
10.4 C
-1.16 C
1915
10.7 C
-0.91 C
1916
10.5 C
-1.08 C
1917
9.5 C
-2.09 C
1924
10.7 C
-0.91 C
1925
11.9 C
+0.29 C
1926
11.4 C
-0.20 C
1927
12.2 C
+0.59 C
1930
12.3 C
+0.70 C
1945
11.9 C
+0.27 C
1947
11.9 C
+0.35 C
1948
12.3 C
+0.75 C
1949
13.3 C
+1.67 C
1950
11.8 C
+0.18 C
1951
12.2 C
+0.61 C
1952
12.6 C
+1.04 C
1953
13.4 C
+1.80 C
1954
12.8 C
+1.19 C
1955
12.2 C
+0.65 C
1956
12.2 C
+0.57 C
1957
12.7 C
+1.12 C
1959
12.8 C
+1.20 C
1960
11.7 C
+0.14 C
The annual mean temperature here has risen by 0.4 C (0.3 to 0.5) per decade over 1901 to 1960. In Fahrenheit: 0.7 F (0.5 to 0.8) per decade. The slope is a straight line fitted to 33 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Clear Spring 1 ENE
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.4 C (0.3 to 0.5) per decade
0.7 F (0.5 to 0.8) per decade
1901 to 1960
33
Rise
Mean daily maximum
0.5 C (0.3 to 0.6) per decade
0.9 F (0.6 to 1.1) per decade
1901 to 1960
33
Rise
Mean daily minimum
0.2 C (0.1 to 0.3) per decade
0.4 F (0.3 to 0.6) per decade
1901 to 1960
33
Rise
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
1899 to 1960
Yearly extremes at Clear Spring 1 ENE: 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)
1930
36.1 C (97.0 F)
55
Coldest night (TNn)
-23.9 C (-11.0 F)
1934
-16.7 C (1.9 F)
55
Wettest day (Rx1day)
178.1 mm (7.0 in)
1953
58.2 mm (2.3 in)
55
Wettest five days (Rx5day)
295.2 mm (11.6 in)
1937
88.9 mm (3.5 in)
55
Longest dry spell (CDD)
32 days
1952
18 days
55
Hottest day (TXx)
The hottest day of the year at Clear Spring 1 ENE, 1899 to 1960. The record is 41.1 C (106.0 F) in 1930, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Clear Spring 1 ENE by year
Year
Hottest day (TXx)
1899
36.1 C (97.0 F)
1900
38.9 C (102.0 F)
1901
35.6 C (96.1 F)
1902
37.2 C (99.0 F)
1903
35.6 C (96.1 F)
1904
33.3 C (91.9 F)
1905
36.1 C (97.0 F)
1906
33.3 C (91.9 F)
1907
32.2 C (90.0 F)
1908
34.4 C (93.9 F)
1909
36.1 C (97.0 F)
1910
34.4 C (93.9 F)
1911
36.1 C (97.0 F)
1912
33.9 C (93.0 F)
1913
35.0 C (95.0 F)
1914
35.6 C (96.1 F)
1915
34.4 C (93.9 F)
1916
33.9 C (93.0 F)
1917
33.9 C (93.0 F)
1918
31.7 C (89.1 F)
1923
33.9 C (93.0 F)
1924
37.8 C (100.0 F)
1925
37.8 C (100.0 F)
1926
40.6 C (105.1 F)
1927
36.7 C (98.1 F)
1928
34.4 C (93.9 F)
1929
38.3 C (100.9 F)
1930
41.1 C (106.0 F)
1931
15.0 C (59.0 F)
1932
27.2 C (81.0 F)
1933
37.2 C (99.0 F)
1934
40.0 C (104.0 F)
1935
37.2 C (99.0 F)
1936
27.8 C (82.0 F)
1937
30.6 C (87.1 F)
1938
32.2 C (90.0 F)
1941
38.9 C (102.0 F)
1942
36.7 C (98.1 F)
1944
38.9 C (102.0 F)
1945
37.2 C (99.0 F)
1946
26.7 C (80.1 F)
1947
36.1 C (97.0 F)
1948
36.7 C (98.1 F)
1949
38.3 C (100.9 F)
1950
35.6 C (96.1 F)
1951
36.1 C (97.0 F)
1952
36.7 C (98.1 F)
1953
38.9 C (102.0 F)
1954
40.6 C (105.1 F)
1955
40.0 C (104.0 F)
1956
36.1 C (97.0 F)
1957
38.3 C (100.9 F)
1958
35.0 C (95.0 F)
1959
36.1 C (97.0 F)
1960
33.9 C (93.0 F)
Coldest night (TNn)
The coldest night of the year at Clear Spring 1 ENE, 1899 to 1960. The record is -23.9 C (-11.0 F) in 1934, marked on the chart; the median year is -16.7 C (1.9 F).
Coldest night (TNn) at Clear Spring 1 ENE by year
Year
Coldest night (TNn)
1899
-9.4 C (15.1 F)
1900
-16.7 C (1.9 F)
1901
-15.0 C (5.0 F)
1902
-15.0 C (5.0 F)
1903
-15.0 C (5.0 F)
1904
-20.6 C (-5.1 F)
1905
-19.4 C (-2.9 F)
1906
-16.1 C (3.0 F)
1907
-20.6 C (-5.1 F)
1908
-17.2 C (1.0 F)
1909
-16.1 C (3.0 F)
1910
-15.6 C (3.9 F)
1911
-13.9 C (7.0 F)
1912
-23.3 C (-9.9 F)
1913
-13.3 C (8.1 F)
1914
-18.9 C (-2.0 F)
1915
-12.2 C (10.0 F)
1916
-16.1 C (3.0 F)
1917
-21.1 C (-6.0 F)
1918
-22.2 C (-8.0 F)
1923
-8.3 C (17.1 F)
1924
-16.1 C (3.0 F)
1925
-21.1 C (-6.0 F)
1926
-17.2 C (1.0 F)
1927
-15.0 C (5.0 F)
1928
-14.4 C (6.1 F)
1929
-14.4 C (6.1 F)
1930
-22.2 C (-8.0 F)
1931
-12.2 C (10.0 F)
1932
-11.7 C (10.9 F)
1933
-19.4 C (-2.9 F)
1934
-23.9 C (-11.0 F)
1935
-19.4 C (-2.9 F)
1936
-21.7 C (-7.1 F)
1937
-12.2 C (10.0 F)
1938
-12.2 C (10.0 F)
1941
-15.0 C (5.0 F)
1942
-22.8 C (-9.0 F)
1944
-15.6 C (3.9 F)
1945
-18.9 C (-2.0 F)
1946
-18.9 C (-2.0 F)
1947
-16.7 C (1.9 F)
1948
-20.6 C (-5.1 F)
1949
-16.1 C (3.0 F)
1950
-16.7 C (1.9 F)
1951
-18.3 C (-0.9 F)
1952
-13.3 C (8.1 F)
1953
-10.0 C (14.0 F)
1954
-15.6 C (3.9 F)
1955
-16.7 C (1.9 F)
1956
-13.3 C (8.1 F)
1957
-20.0 C (-4.0 F)
1958
-17.2 C (1.0 F)
1959
-16.7 C (1.9 F)
1960
-23.9 C (-11.0 F)
Wettest day (Rx1day)
The wettest day of the year at Clear Spring 1 ENE, 1899 to 1960. The record is 178.1 mm (7.0 in) in 1953, marked on the chart; the median year is 58.2 mm (2.3 in).
Wettest day (Rx1day) at Clear Spring 1 ENE by year
Year
Wettest day (Rx1day)
1899
47.0 mm (1.9 in)
1900
55.9 mm (2.2 in)
1901
97.8 mm (3.9 in)
1902
57.2 mm (2.3 in)
1903
68.6 mm (2.7 in)
1904
44.7 mm (1.8 in)
1905
61.0 mm (2.4 in)
1906
77.5 mm (3.1 in)
1907
52.1 mm (2.1 in)
1908
59.7 mm (2.4 in)
1909
66.0 mm (2.6 in)
1910
29.2 mm (1.1 in)
1911
82.6 mm (3.3 in)
1912
81.3 mm (3.2 in)
1913
59.7 mm (2.4 in)
1914
47.0 mm (1.9 in)
1915
85.1 mm (3.4 in)
1916
95.0 mm (3.7 in)
1917
67.1 mm (2.6 in)
1918
63.5 mm (2.5 in)
1923
36.3 mm (1.4 in)
1924
55.9 mm (2.2 in)
1925
42.7 mm (1.7 in)
1926
41.7 mm (1.6 in)
1927
76.7 mm (3.0 in)
1928
102.4 mm (4.0 in)
1929
113.8 mm (4.5 in)
1930
58.2 mm (2.3 in)
1931
26.2 mm (1.0 in)
1932
39.1 mm (1.5 in)
1933
46.2 mm (1.8 in)
1934
31.2 mm (1.2 in)
1935
53.8 mm (2.1 in)
1936
42.7 mm (1.7 in)
1937
148.3 mm (5.8 in)
1938
16.5 mm (0.6 in)
1941
81.3 mm (3.2 in)
1942
78.7 mm (3.1 in)
1944
28.4 mm (1.1 in)
1945
84.1 mm (3.3 in)
1946
17.8 mm (0.7 in)
1947
53.3 mm (2.1 in)
1948
108.7 mm (4.3 in)
1949
84.6 mm (3.3 in)
1950
63.8 mm (2.5 in)
1951
55.9 mm (2.2 in)
1952
114.6 mm (4.5 in)
1953
178.1 mm (7.0 in)
1954
73.7 mm (2.9 in)
1955
64.8 mm (2.6 in)
1956
40.9 mm (1.6 in)
1957
44.7 mm (1.8 in)
1958
43.2 mm (1.7 in)
1959
53.8 mm (2.1 in)
1960
51.6 mm (2.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Clear Spring 1 ENE, 1899 to 1960. The record is 295.2 mm (11.6 in) in 1937, marked on the chart; the median year is 88.9 mm (3.5 in).
Wettest five days (Rx5day) at Clear Spring 1 ENE by year
Year
Wettest five days (Rx5day)
1899
55.4 mm (2.2 in)
1900
95.8 mm (3.8 in)
1901
122.0 mm (4.8 in)
1902
77.2 mm (3.0 in)
1903
103.7 mm (4.1 in)
1904
61.9 mm (2.4 in)
1905
74.9 mm (2.9 in)
1906
144.4 mm (5.7 in)
1907
66.1 mm (2.6 in)
1908
111.5 mm (4.4 in)
1909
73.6 mm (2.9 in)
1910
74.9 mm (2.9 in)
1911
116.6 mm (4.6 in)
1912
120.4 mm (4.7 in)
1913
82.3 mm (3.2 in)
1914
64.6 mm (2.5 in)
1915
117.1 mm (4.6 in)
1916
97.0 mm (3.8 in)
1917
98.6 mm (3.9 in)
1918
150.4 mm (5.9 in)
1923
60.9 mm (2.4 in)
1924
134.3 mm (5.3 in)
1925
46.5 mm (1.8 in)
1926
102.1 mm (4.0 in)
1927
116.3 mm (4.6 in)
1928
143.0 mm (5.6 in)
1929
141.6 mm (5.6 in)
1930
67.8 mm (2.7 in)
1931
29.0 mm (1.1 in)
1932
76.0 mm (3.0 in)
1933
83.4 mm (3.3 in)
1934
45.7 mm (1.8 in)
1935
67.0 mm (2.6 in)
1936
88.9 mm (3.5 in)
1937
295.2 mm (11.6 in)
1938
31.5 mm (1.2 in)
1941
93.5 mm (3.7 in)
1942
99.2 mm (3.9 in)
1944
55.1 mm (2.2 in)
1945
166.4 mm (6.6 in)
1946
27.4 mm (1.1 in)
1947
117.0 mm (4.6 in)
1948
121.9 mm (4.8 in)
1949
105.4 mm (4.1 in)
1950
119.0 mm (4.7 in)
1951
62.5 mm (2.5 in)
1952
154.6 mm (6.1 in)
1953
261.4 mm (10.3 in)
1954
83.4 mm (3.3 in)
1955
105.6 mm (4.2 in)
1956
74.4 mm (2.9 in)
1957
66.1 mm (2.6 in)
1958
81.6 mm (3.2 in)
1959
74.6 mm (2.9 in)
1960
76.2 mm (3.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Clear Spring 1 ENE, 1899 to 1960. The record is 32 days in 1952, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Clear Spring 1 ENE by year
Year
Longest dry spell (CDD)
1899
16 days
1900
18 days
1901
24 days
1902
17 days
1903
18 days
1904
19 days
1905
22 days
1906
17 days
1907
19 days
1908
22 days
1909
24 days
1910
23 days
1911
21 days
1912
19 days
1913
16 days
1914
21 days
1915
18 days
1916
15 days
1917
20 days
1918
10 days
1923
26 days
1924
27 days
1925
16 days
1926
15 days
1927
14 days
1928
12 days
1929
15 days
1930
29 days
1931
11 days
1932
12 days
1933
11 days
1934
18 days
1935
14 days
1936
12 days
1937
5 days
1938
12 days
1941
18 days
1942
20 days
1944
19 days
1945
16 days
1946
14 days
1947
24 days
1948
14 days
1949
19 days
1950
14 days
1951
21 days
1952
32 days
1953
23 days
1954
12 days
1955
22 days
1956
18 days
1957
17 days
1958
14 days
1959
14 days
1960
13 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
33 years with a frost
Across 33 years with a frost, the median last spring frost at Clear Spring 1 ENE falls on 20 April and the median first autumn frost on 23 October, which leaves a median of 194 days between them.
Fitted over all years, the growing season changes by -3.8 days per decade at this station.
Frost dates and growing season at Clear Spring 1 ENE
Measure
Median, all years
Earliest period
Recent period (1906 to 1960)
Recent against earliest
Fitted trend
Last spring frost
20 April
n/a
21 April
n/a
+1.6 days per decade
First autumn frost
23 October
n/a
22 October
n/a
-2.2 days per decade
Growing days
194 days
n/a
187 days
n/a
-3.8 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
33 years, 1901 to 1960
A day with at least 64.3 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 168.2 mm (6.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Clear Spring 1 ENE: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
64.3 mm (2.5 in)
5 years
87.4 mm (3.4 in)
10 years
104.4 mm (4.1 in)
25 years
128.1 mm (5.0 in)
50 years
147.4 mm (5.8 in)
Longer than the 33 years of record
100 years
168.2 mm (6.6 in)
Longer than the 33 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, 33 years of values from 1901 to 1960.
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: 178.1 mm (7.0 in) in 1953; 114.6 mm (4.5 in) in 1952; 108.7 mm (4.3 in) in 1948.
Download the Data
Data for Clear Spring 1 ENE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Clear Spring 1 ENE 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.