Record envelope, standing records and threshold days for Cheltenham 1 NW (USC00181710), Maryland, United States, with 56 years of record.
Key Facts for Cheltenham 1 NW
Cheltenham 1 NW (USC00181710) is a weather station in Maryland, United States at 38.73 latitude and -76.85 longitude, 70 m (230 ft) above sea level.
The station reports from 1901 to 1956, 56 years of record.
1,464 records set at Cheltenham 1 NW still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Cheltenham 1 NW set a daily record low maximum temperature of 13.3 C (55.9 F) on 29 September 1956.
About the Station
Location: Maryland, United States, 38.73 latitude, -76.85 longitude.
Elevation: 70 m (230 ft).
Period of record: 1901 to 1956, 56 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 Cheltenham 1 NW. 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 Cheltenham 1 NW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
26.1 C (79.0 F)
-26.7 C (-16.1 F)
n/a
n/a
Feb
28.9 C (84.0 F)
-22.2 C (-8.0 F)
n/a
n/a
Mar
32.8 C (91.0 F)
-14.4 C (6.1 F)
n/a
n/a
Apr
35.0 C (95.0 F)
-11.1 C (12.0 F)
n/a
n/a
May
36.1 C (97.0 F)
-2.8 C (27.0 F)
n/a
n/a
Jun
38.3 C (100.9 F)
2.2 C (36.0 F)
n/a
n/a
Jul
41.1 C (106.0 F)
8.3 C (46.9 F)
n/a
n/a
Aug
40.6 C (105.1 F)
6.1 C (43.0 F)
n/a
n/a
Sep
38.3 C (100.9 F)
0.0 C (32.0 F)
n/a
n/a
Oct
35.6 C (96.1 F)
-6.7 C (19.9 F)
n/a
n/a
Nov
29.4 C (84.9 F)
-15.0 C (5.0 F)
n/a
n/a
Dec
24.4 C (75.9 F)
-21.7 C (-7.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Cheltenham 1 NW still stand. 1930 holds the most, with 64.
Standing records at Cheltenham 1 NW by the year they were set
Year set
Standing records
1901
13
1902
24
1903
27
1904
27
1905
26
1906
22
1907
30
1908
31
1909
24
1910
16
1911
32
1912
29
1913
23
1914
40
1915
20
1916
23
1917
38
1918
41
1919
26
1920
18
1921
28
1922
15
1923
29
1924
17
1925
44
1926
30
1927
35
1928
21
1929
44
1930
64
1931
15
1932
25
1933
27
1934
33
1935
28
1936
35
1937
32
1938
26
1939
23
1940
29
1941
23
1942
28
1943
27
1944
15
1945
24
1946
16
1947
26
1948
19
1949
10
1950
30
1951
21
1952
7
1953
16
1954
38
1955
12
1956
22
Wettest Day of Each Month
Aug: 280.9 mm (11.1 in)
The wettest day on record for each calendar month at Cheltenham 1 NW. The most was 280.9 mm (11.1 in) on 12 August 1928.
Record daily precipitation for each month at Cheltenham 1 NW
Month
Record daily precipitation (mm)
Date
Jan
61.0 mm (2.4 in)
24 January 1940
Feb
50.8 mm (2.0 in)
4 February 1932
Mar
58.4 mm (2.3 in)
15 March 1912
Apr
97.8 mm (3.9 in)
10 April 1918
May
57.2 mm (2.3 in)
14 May 1905
Jun
111.0 mm (4.4 in)
14 June 1947
Jul
95.8 mm (3.8 in)
3 July 1920
Aug
280.9 mm (11.1 in)
12 August 1928
Sep
148.6 mm (5.9 in)
2 September 1922
Oct
88.9 mm (3.5 in)
5 October 1902
Nov
80.5 mm (3.2 in)
13 November 1937
Dec
67.6 mm (2.7 in)
4 December 1948
Period of Record Coverage
1901 to 1956
Complete yearUnder 90 percent of days
56 years of record at Cheltenham 1 NW, 1901 to 1956. 2 years have data for under 90 percent of days and are left out of rankings: 1901, 1956.
Cooler than the station meanWarmer than the station mean
One stripe for each of 54 complete years at Cheltenham 1 NW, 1902 to 1955. Blue stripes are years cooler than the station's own mean of 12.8 C (55.1 F); red stripes are warmer. The coolest year was 1904, at 10.9 C (51.6 F), and the warmest was 1921, at 14.6 C (58.2 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at Cheltenham 1 NW as warming stripes, 1902 to 1955
Year
Annual mean temperature
Difference from the station mean
1902
12.2 C
-0.67 C
1903
12.3 C
-0.56 C
1904
10.9 C
-1.96 C
1905
11.9 C
-0.95 C
1906
12.8 C
-0.06 C
1907
11.4 C
-1.43 C
1908
12.9 C
+0.04 C
1909
13.1 C
+0.29 C
1910
12.9 C
+0.08 C
1911
13.7 C
+0.82 C
1912
12.4 C
-0.49 C
1913
13.9 C
+1.04 C
1914
12.6 C
-0.29 C
1915
12.8 C
-0.07 C
1916
12.7 C
-0.14 C
1917
11.7 C
-1.19 C
1918
12.9 C
+0.01 C
1919
13.5 C
+0.62 C
1920
12.3 C
-0.54 C
1921
14.6 C
+1.71 C
1922
13.5 C
+0.66 C
1923
13.3 C
+0.42 C
1924
12.3 C
-0.53 C
1925
13.3 C
+0.50 C
1926
12.3 C
-0.55 C
1927
13.0 C
+0.17 C
1928
12.9 C
+0.09 C
1929
13.4 C
+0.57 C
1930
13.7 C
+0.84 C
1931
14.1 C
+1.22 C
1932
13.7 C
+0.82 C
1933
13.6 C
+0.78 C
1934
13.2 C
+0.33 C
1935
12.7 C
-0.12 C
1936
12.3 C
-0.56 C
1937
12.6 C
-0.26 C
1938
13.0 C
+0.11 C
1939
13.0 C
+0.17 C
1940
11.4 C
-1.48 C
1941
12.9 C
+0.04 C
1942
12.9 C
+0.02 C
1943
12.6 C
-0.27 C
1944
12.5 C
-0.37 C
1945
12.7 C
-0.10 C
1946
13.4 C
+0.58 C
1947
12.4 C
-0.44 C
1948
12.6 C
-0.20 C
1949
13.7 C
+0.90 C
1950
12.4 C
-0.41 C
1951
12.8 C
-0.04 C
1952
13.0 C
+0.13 C
1953
13.7 C
+0.82 C
1954
13.0 C
+0.15 C
1955
12.7 C
-0.14 C
The fitted trend in annual mean temperature here over 1902 to 1955 is 0.09 C (-0.03 to 0.21) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.2 F (-0.1 to 0.4) 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 Cheltenham 1 NW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.09 C (-0.03 to 0.21) per decade
0.2 F (-0.1 to 0.4) per decade
1902 to 1955
54
Not clearly different from zero
Mean daily maximum
0.13 C (-0.03 to 0.29) per decade
0.2 F (-0.1 to 0.5) per decade
1902 to 1955
54
Not clearly different from zero
Mean daily minimum
0.05 C (-0.05 to 0.15) per decade
0.1 F (-0.1 to 0.3) per decade
1902 to 1955
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
1901 to 1956
Yearly extremes at Cheltenham 1 NW: 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
36.4 C (97.5 F)
56
Coldest night (TNn)
-26.7 C (-16.1 F)
1912
-15.3 C (4.5 F)
56
Wettest day (Rx1day)
280.9 mm (11.1 in)
1928
73.8 mm (2.9 in)
56
Wettest five days (Rx5day)
341.1 mm (13.4 in)
1928
103.1 mm (4.1 in)
56
Longest dry spell (CDD)
28 days
1901
18 days
56
Hottest day (TXx)
The hottest day of the year at Cheltenham 1 NW, 1901 to 1956. The record is 41.1 C (106.0 F) in 1930, marked on the chart; the median year is 36.4 C (97.5 F).
Hottest day (TXx) at Cheltenham 1 NW by year
Year
Hottest day (TXx)
1901
38.3 C (100.9 F)
1902
37.2 C (99.0 F)
1903
36.7 C (98.1 F)
1904
33.9 C (93.0 F)
1905
34.4 C (93.9 F)
1906
33.9 C (93.0 F)
1907
33.3 C (91.9 F)
1908
36.7 C (98.1 F)
1909
35.6 C (96.1 F)
1910
33.9 C (93.0 F)
1911
37.2 C (99.0 F)
1912
33.9 C (93.0 F)
1913
36.1 C (97.0 F)
1914
36.1 C (97.0 F)
1915
36.1 C (97.0 F)
1916
36.1 C (97.0 F)
1917
35.6 C (96.1 F)
1918
40.6 C (105.1 F)
1919
36.7 C (98.1 F)
1920
34.4 C (93.9 F)
1921
36.7 C (98.1 F)
1922
33.9 C (93.0 F)
1923
35.6 C (96.1 F)
1924
37.8 C (100.0 F)
1925
37.8 C (100.0 F)
1926
37.8 C (100.0 F)
1927
35.0 C (95.0 F)
1928
36.1 C (97.0 F)
1929
36.7 C (98.1 F)
1930
41.1 C (106.0 F)
1931
37.2 C (99.0 F)
1932
39.4 C (102.9 F)
1933
37.8 C (100.0 F)
1934
38.3 C (100.9 F)
1935
35.6 C (96.1 F)
1936
40.0 C (104.0 F)
1937
35.0 C (95.0 F)
1938
35.0 C (95.0 F)
1939
36.1 C (97.0 F)
1940
36.7 C (98.1 F)
1941
36.7 C (98.1 F)
1942
36.7 C (98.1 F)
1943
37.2 C (99.0 F)
1944
35.6 C (96.1 F)
1945
36.1 C (97.0 F)
1946
35.6 C (96.1 F)
1947
36.7 C (98.1 F)
1948
36.7 C (98.1 F)
1949
36.1 C (97.0 F)
1950
35.6 C (96.1 F)
1951
35.0 C (95.0 F)
1952
37.2 C (99.0 F)
1953
38.3 C (100.9 F)
1954
40.0 C (104.0 F)
1955
37.2 C (99.0 F)
1956
35.0 C (95.0 F)
Coldest night (TNn)
The coldest night of the year at Cheltenham 1 NW, 1901 to 1956. The record is -26.7 C (-16.1 F) in 1912, marked on the chart; the median year is -15.3 C (4.5 F).
Coldest night (TNn) at Cheltenham 1 NW by year
Year
Coldest night (TNn)
1901
-17.8 C (0.0 F)
1902
-18.9 C (-2.0 F)
1903
-16.1 C (3.0 F)
1904
-18.9 C (-2.0 F)
1905
-20.6 C (-5.1 F)
1906
-14.4 C (6.1 F)
1907
-17.8 C (0.0 F)
1908
-15.6 C (3.9 F)
1909
-12.8 C (9.0 F)
1910
-15.0 C (5.0 F)
1911
-11.7 C (10.9 F)
1912
-26.7 C (-16.1 F)
1913
-12.8 C (9.0 F)
1914
-19.4 C (-2.9 F)
1915
-11.7 C (10.9 F)
1916
-16.7 C (1.9 F)
1917
-21.7 C (-7.1 F)
1918
-21.7 C (-7.1 F)
1919
-16.7 C (1.9 F)
1920
-15.0 C (5.0 F)
1921
-13.3 C (8.1 F)
1922
-14.4 C (6.1 F)
1923
-13.9 C (7.0 F)
1924
-17.8 C (0.0 F)
1925
-17.8 C (0.0 F)
1926
-17.2 C (1.0 F)
1927
-15.0 C (5.0 F)
1928
-16.7 C (1.9 F)
1929
-13.9 C (7.0 F)
1930
-16.7 C (1.9 F)
1931
-12.2 C (10.0 F)
1932
-13.3 C (8.1 F)
1933
-13.9 C (7.0 F)
1934
-22.2 C (-8.0 F)
1935
-23.3 C (-9.9 F)
1936
-18.3 C (-0.9 F)
1937
-12.8 C (9.0 F)
1938
-12.2 C (10.0 F)
1939
-12.2 C (10.0 F)
1940
-18.9 C (-2.0 F)
1941
-11.1 C (12.0 F)
1942
-20.0 C (-4.0 F)
1943
-17.2 C (1.0 F)
1944
-11.1 C (12.0 F)
1945
-13.3 C (8.1 F)
1946
-15.0 C (5.0 F)
1947
-16.1 C (3.0 F)
1948
-17.2 C (1.0 F)
1949
-10.0 C (14.0 F)
1950
-12.8 C (9.0 F)
1951
-16.1 C (3.0 F)
1952
-12.8 C (9.0 F)
1953
-12.2 C (10.0 F)
1954
-13.9 C (7.0 F)
1955
-15.6 C (3.9 F)
1956
-10.6 C (12.9 F)
Wettest day (Rx1day)
The wettest day of the year at Cheltenham 1 NW, 1901 to 1956. The record is 280.9 mm (11.1 in) in 1928, marked on the chart; the median year is 73.8 mm (2.9 in).
Wettest day (Rx1day) at Cheltenham 1 NW by year
Year
Wettest day (Rx1day)
1901
53.3 mm (2.1 in)
1902
88.9 mm (3.5 in)
1903
47.0 mm (1.9 in)
1904
102.6 mm (4.0 in)
1905
75.7 mm (3.0 in)
1906
39.1 mm (1.5 in)
1907
77.5 mm (3.1 in)
1908
84.6 mm (3.3 in)
1909
62.2 mm (2.4 in)
1910
73.2 mm (2.9 in)
1911
42.4 mm (1.7 in)
1912
58.4 mm (2.3 in)
1913
71.9 mm (2.8 in)
1914
50.8 mm (2.0 in)
1915
78.7 mm (3.1 in)
1916
43.2 mm (1.7 in)
1917
62.7 mm (2.5 in)
1918
97.8 mm (3.9 in)
1919
55.9 mm (2.2 in)
1920
95.8 mm (3.8 in)
1921
54.1 mm (2.1 in)
1922
148.6 mm (5.9 in)
1923
41.4 mm (1.6 in)
1924
110.5 mm (4.4 in)
1925
75.2 mm (3.0 in)
1926
67.1 mm (2.6 in)
1927
56.1 mm (2.2 in)
1928
280.9 mm (11.1 in)
1929
66.5 mm (2.6 in)
1930
32.5 mm (1.3 in)
1931
69.9 mm (2.8 in)
1932
74.4 mm (2.9 in)
1933
185.4 mm (7.3 in)
1934
65.5 mm (2.6 in)
1935
85.1 mm (3.4 in)
1936
47.5 mm (1.9 in)
1937
80.5 mm (3.2 in)
1938
50.8 mm (2.0 in)
1939
101.6 mm (4.0 in)
1940
64.5 mm (2.5 in)
1941
45.5 mm (1.8 in)
1942
104.1 mm (4.1 in)
1943
80.0 mm (3.1 in)
1944
175.3 mm (6.9 in)
1945
83.6 mm (3.3 in)
1946
101.6 mm (4.0 in)
1947
111.0 mm (4.4 in)
1948
75.7 mm (3.0 in)
1949
52.1 mm (2.1 in)
1950
104.9 mm (4.1 in)
1951
42.7 mm (1.7 in)
1952
117.1 mm (4.6 in)
1953
91.2 mm (3.6 in)
1954
43.9 mm (1.7 in)
1955
242.3 mm (9.5 in)
1956
59.2 mm (2.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Cheltenham 1 NW, 1901 to 1956. The record is 341.1 mm (13.4 in) in 1928, marked on the chart; the median year is 103.1 mm (4.1 in).
Wettest five days (Rx5day) at Cheltenham 1 NW by year
Year
Wettest five days (Rx5day)
1901
83.6 mm (3.3 in)
1902
113.5 mm (4.5 in)
1903
75.0 mm (3.0 in)
1904
102.6 mm (4.0 in)
1905
82.1 mm (3.2 in)
1906
103.5 mm (4.1 in)
1907
107.4 mm (4.2 in)
1908
93.5 mm (3.7 in)
1909
62.2 mm (2.4 in)
1910
145.3 mm (5.7 in)
1911
97.7 mm (3.8 in)
1912
122.2 mm (4.8 in)
1913
116.9 mm (4.6 in)
1914
78.4 mm (3.1 in)
1915
118.9 mm (4.7 in)
1916
79.5 mm (3.1 in)
1917
104.1 mm (4.1 in)
1918
174.3 mm (6.9 in)
1919
107.0 mm (4.2 in)
1920
102.2 mm (4.0 in)
1921
61.2 mm (2.4 in)
1922
149.1 mm (5.9 in)
1923
62.3 mm (2.5 in)
1924
116.8 mm (4.6 in)
1925
79.0 mm (3.1 in)
1926
94.2 mm (3.7 in)
1927
81.7 mm (3.2 in)
1928
341.1 mm (13.4 in)
1929
96.3 mm (3.8 in)
1930
67.3 mm (2.6 in)
1931
102.4 mm (4.0 in)
1932
96.1 mm (3.8 in)
1933
245.3 mm (9.7 in)
1934
143.8 mm (5.7 in)
1935
196.9 mm (7.8 in)
1936
70.1 mm (2.8 in)
1937
137.9 mm (5.4 in)
1938
99.8 mm (3.9 in)
1939
101.6 mm (4.0 in)
1940
88.6 mm (3.5 in)
1941
83.7 mm (3.3 in)
1942
174.5 mm (6.9 in)
1943
113.6 mm (4.5 in)
1944
225.3 mm (8.9 in)
1945
127.4 mm (5.0 in)
1946
105.9 mm (4.2 in)
1947
165.9 mm (6.5 in)
1948
169.2 mm (6.7 in)
1949
64.8 mm (2.6 in)
1950
181.4 mm (7.1 in)
1951
81.3 mm (3.2 in)
1952
145.6 mm (5.7 in)
1953
105.7 mm (4.2 in)
1954
69.6 mm (2.7 in)
1955
281.9 mm (11.1 in)
1956
66.1 mm (2.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Cheltenham 1 NW, 1901 to 1956. The record is 28 days in 1901, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Cheltenham 1 NW by year
Year
Longest dry spell (CDD)
1901
28 days
1902
18 days
1903
21 days
1904
25 days
1905
20 days
1906
17 days
1907
13 days
1908
21 days
1909
16 days
1910
22 days
1911
20 days
1912
20 days
1913
15 days
1914
18 days
1915
27 days
1916
14 days
1917
21 days
1918
19 days
1919
14 days
1920
27 days
1921
15 days
1922
24 days
1923
16 days
1924
26 days
1925
12 days
1926
18 days
1927
13 days
1928
16 days
1929
14 days
1930
27 days
1931
19 days
1932
16 days
1933
12 days
1934
19 days
1935
18 days
1936
15 days
1937
20 days
1938
16 days
1939
21 days
1940
17 days
1941
20 days
1942
16 days
1943
16 days
1944
18 days
1945
17 days
1946
21 days
1947
12 days
1948
10 days
1949
18 days
1950
15 days
1951
12 days
1952
22 days
1953
18 days
1954
19 days
1955
19 days
1956
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 Cheltenham 1 NW falls on 20 April and the median first autumn frost on 20 October, which leaves a median of 184 days between them.
Fitted over all years, the growing season changes by -0.9 days per decade at this station.
Frost dates and growing season at Cheltenham 1 NW
Measure
Median, all years
Earliest period
Recent period (1926 to 1955)
Recent against earliest
Fitted trend
Last spring frost
20 April
n/a
22 April
n/a
+0.5 days per decade
First autumn frost
20 October
n/a
19 October
n/a
-0.4 days per decade
Growing days
184 days
n/a
185 days
n/a
-0.9 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
53 years, 1902 to 1955
A day with at least 71.4 mm (2.8 in) of rain is expected about once in 2 years. A day with at least 277.6 mm (10.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Cheltenham 1 NW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
71.4 mm (2.8 in)
5 years
106.3 mm (4.2 in)
10 years
135.8 mm (5.3 in)
25 years
182.6 mm (7.2 in)
50 years
225.9 mm (8.9 in)
100 years
277.6 mm (10.9 in)
Longer than the 53 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, 53 years of values from 1902 to 1955.
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: 280.9 mm (11.1 in) in 1928; 242.3 mm (9.5 in) in 1955; 185.4 mm (7.3 in) in 1933.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Cheltenham 1 NW, at 1908 and 1936. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1908 ran 0.3 C (0.5 F) higher than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1936 ran 0.3 C (0.6 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Cheltenham 1 NW, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1908
+0.3
+0.5
likely
5
1936
-0.3
-0.6
likely
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for Cheltenham 1 NW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Cheltenham 1 NW 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.