Record envelope, standing records and threshold days for Grantsville (USC00183795), Maryland, United States, with 57 years of record.
Key Facts for Grantsville
Grantsville (USC00183795) is a weather station in Maryland, United States at 39.70 latitude and -79.15 longitude, 726 m (2,382 ft) above sea level.
The station reports from 1895 to 1951, 57 years of record.
1,464 records set at Grantsville still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Grantsville set a daily record precipitation of 33.8 mm (1.3 in) on 13 June 1951.
About the Station
Location: Maryland, United States, 39.70 latitude, -79.15 longitude.
Elevation: 726 m (2,382 ft).
Period of record: 1895 to 1951, 57 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 Grantsville. 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 Grantsville, 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)
-32.2 C (-26.0 F)
n/a
n/a
Feb
23.9 C (75.0 F)
-30.0 C (-22.0 F)
n/a
n/a
Mar
26.7 C (80.1 F)
-21.7 C (-7.1 F)
n/a
n/a
Apr
30.6 C (87.1 F)
-19.4 C (-2.9 F)
n/a
n/a
May
32.2 C (90.0 F)
-6.1 C (21.0 F)
n/a
n/a
Jun
33.9 C (93.0 F)
-1.7 C (28.9 F)
n/a
n/a
Jul
36.1 C (97.0 F)
1.1 C (34.0 F)
n/a
n/a
Aug
37.8 C (100.0 F)
0.0 C (32.0 F)
n/a
n/a
Sep
33.3 C (91.9 F)
-3.9 C (25.0 F)
n/a
n/a
Oct
30.6 C (87.1 F)
-10.0 C (14.0 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-23.9 C (-11.0 F)
n/a
n/a
Dec
18.9 C (66.0 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 Grantsville still stand. 1914 holds the most, with 57.
Standing records at Grantsville by the year they were set
Year set
Standing records
1895
44
1896
46
1897
28
1898
39
1899
39
1900
48
1901
33
1902
19
1903
44
1904
41
1905
34
1906
29
1907
22
1908
16
1909
32
1910
33
1911
28
1912
33
1913
43
1914
57
1915
24
1916
26
1917
33
1918
35
1919
31
1920
22
1921
14
1922
10
1923
35
1924
20
1925
45
1926
41
1927
42
1928
34
1929
32
1930
53
1931
25
1932
43
1933
40
1934
25
1935
16
1936
26
1937
10
1938
11
1939
4
1940
16
1943
41
1944
2
All-Time Record Progression
1 new records
1 all-time records were set at Grantsville between 28 January 1925 and 28 January 1925. Each dot is a new record.
When Grantsville set new all-time records
Date
Kind
Detail
1925-01-28
Record low minimum temperature
Record low minimum temperature -32.2 C (-26.0 F)
Wettest Day of Each Month
Aug: 106.4 mm (4.2 in)
The wettest day on record for each calendar month at Grantsville. The most was 106.4 mm (4.2 in) on 16 August 1909.
Record daily precipitation for each month at Grantsville
Month
Record daily precipitation (mm)
Date
Jan
50.8 mm (2.0 in)
12 January 1907
Feb
57.2 mm (2.3 in)
20 February 1927
Mar
97.0 mm (3.8 in)
17 March 1936
Apr
50.8 mm (2.0 in)
28 April 1928
May
89.4 mm (3.5 in)
23 May 1921
Jun
57.7 mm (2.3 in)
18 June 1934
Jul
101.6 mm (4.0 in)
17 July 1898
Aug
106.4 mm (4.2 in)
16 August 1909
Sep
65.8 mm (2.6 in)
21 September 1950
Oct
89.4 mm (3.5 in)
2 October 1929
Nov
42.4 mm (1.7 in)
9 November 1913
Dec
58.4 mm (2.3 in)
13 December 1909
Period of Record Coverage
1895 to 1944
Complete yearUnder 90 percent of days
48 years of record at Grantsville, 1895 to 1944. 12 years have data for under 90 percent of days and are left out of rankings: 1895, 1896, 1918, 1929, 1934, 1935, 1936, 1937 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 32 complete years at Grantsville, 1897 to 1943. Blue stripes are years cooler than the station's own mean of 8.6 C (47.4 F); red stripes are warmer. The coolest year was 1917, at 7.1 C (44.8 F), and the warmest was 1913, at 9.6 C (49.4 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Grantsville as warming stripes, 1897 to 1943
Year
Annual mean temperature
Difference from the station mean
1897
9.1 C
+0.48 C
1898
9.2 C
+0.67 C
1899
8.9 C
+0.32 C
1900
9.3 C
+0.74 C
1901
8.4 C
-0.17 C
1902
8.3 C
-0.26 C
1903
8.1 C
-0.46 C
1904
7.9 C
-0.64 C
1905
8.5 C
-0.08 C
1906
9.1 C
+0.48 C
1907
7.9 C
-0.63 C
1908
9.0 C
+0.44 C
1909
8.6 C
+0.01 C
1911
9.4 C
+0.78 C
1912
8.5 C
-0.11 C
1913
9.6 C
+1.07 C
1914
8.6 C
+0.05 C
1915
8.2 C
-0.37 C
1916
8.6 C
+0.05 C
1917
7.1 C
-1.48 C
1919
9.0 C
+0.44 C
1920
7.8 C
-0.75 C
1923
8.5 C
-0.10 C
1924
7.6 C
-1.02 C
1926
7.8 C
-0.79 C
1927
8.8 C
+0.27 C
1928
8.2 C
-0.33 C
1930
8.7 C
+0.12 C
1931
9.6 C
+0.99 C
1932
8.8 C
+0.24 C
1933
9.2 C
+0.64 C
1943
7.9 C
-0.67 C
The fitted trend in annual mean temperature here over 1897 to 1943 is -0.1 C (-0.3 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.5 to 0.2) per decade. The slope is a straight line fitted to 32 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Grantsville
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.1 C (-0.3 to 0.1) per decade
-0.1 F (-0.5 to 0.2) per decade
1897 to 1943
32
Not clearly different from zero
Mean daily maximum
-0.04 C (-0.24 to 0.16) per decade
-0.1 F (-0.4 to 0.3) per decade
1897 to 1943
32
Not clearly different from zero
Mean daily minimum
-0.1 C (-0.3 to 0.1) per decade
-0.2 F (-0.6 to 0.2) per decade
1897 to 1943
32
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
1895 to 1951
Yearly extremes at Grantsville: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
37.8 C (100.0 F)
1918
32.5 C (90.5 F)
48
Coldest night (TNn)
-32.2 C (-26.0 F)
1925
-23.0 C (-9.5 F)
48
Wettest day (Rx1day)
106.4 mm (4.2 in)
1909
50.3 mm (2.0 in)
52
Wettest five days (Rx5day)
151.7 mm (6.0 in)
1911
88.0 mm (3.5 in)
52
Longest dry spell (CDD)
33 days
1908
14 days
52
Hottest day (TXx)
The hottest day of the year at Grantsville, 1895 to 1951. The record is 37.8 C (100.0 F) in 1918, marked on the chart; the median year is 32.5 C (90.5 F).
Hottest day (TXx) at Grantsville by year
Year
Hottest day (TXx)
1895
32.2 C (90.0 F)
1896
32.8 C (91.0 F)
1897
34.4 C (93.9 F)
1898
34.4 C (93.9 F)
1899
33.3 C (91.9 F)
1900
33.3 C (91.9 F)
1901
33.9 C (93.0 F)
1902
31.1 C (88.0 F)
1903
32.2 C (90.0 F)
1904
33.9 C (93.0 F)
1905
33.3 C (91.9 F)
1906
30.6 C (87.1 F)
1907
29.4 C (84.9 F)
1908
31.7 C (89.1 F)
1909
30.6 C (87.1 F)
1910
30.0 C (86.0 F)
1911
32.8 C (91.0 F)
1912
32.8 C (91.0 F)
1913
33.3 C (91.9 F)
1914
32.8 C (91.0 F)
1915
31.1 C (88.0 F)
1916
31.7 C (89.1 F)
1917
32.2 C (90.0 F)
1918
37.8 C (100.0 F)
1919
33.3 C (91.9 F)
1920
29.4 C (84.9 F)
1921
31.7 C (89.1 F)
1922
31.7 C (89.1 F)
1923
31.7 C (89.1 F)
1924
31.1 C (88.0 F)
1925
32.8 C (91.0 F)
1926
33.3 C (91.9 F)
1927
31.1 C (88.0 F)
1928
30.6 C (87.1 F)
1929
31.1 C (88.0 F)
1930
35.6 C (96.1 F)
1931
33.3 C (91.9 F)
1932
33.3 C (91.9 F)
1933
32.8 C (91.0 F)
1934
36.1 C (97.0 F)
1935
31.7 C (89.1 F)
1936
35.0 C (95.0 F)
1937
32.2 C (90.0 F)
1938
32.8 C (91.0 F)
1939
29.4 C (84.9 F)
1940
32.2 C (90.0 F)
1943
33.9 C (93.0 F)
1944
15.0 C (59.0 F)
1948
n/a
1949
n/a
1950
n/a
1951
n/a
Coldest night (TNn)
The coldest night of the year at Grantsville, 1895 to 1951. The record is -32.2 C (-26.0 F) in 1925, marked on the chart; the median year is -23.0 C (-9.5 F).
Coldest night (TNn) at Grantsville by year
Year
Coldest night (TNn)
1895
-25.6 C (-14.1 F)
1896
-21.7 C (-7.1 F)
1897
-22.8 C (-9.0 F)
1898
-20.6 C (-5.1 F)
1899
-30.0 C (-22.0 F)
1900
-23.3 C (-9.9 F)
1901
-22.2 C (-8.0 F)
1902
-23.3 C (-9.9 F)
1903
-22.8 C (-9.0 F)
1904
-28.9 C (-20.0 F)
1905
-26.1 C (-15.0 F)
1906
-22.2 C (-8.0 F)
1907
-26.7 C (-16.1 F)
1908
-23.9 C (-11.0 F)
1909
-18.9 C (-2.0 F)
1910
-21.1 C (-6.0 F)
1911
-17.8 C (0.0 F)
1912
-31.7 C (-25.1 F)
1913
-17.2 C (1.0 F)
1914
-28.3 C (-18.9 F)
1915
-17.8 C (0.0 F)
1916
-22.8 C (-9.0 F)
1917
-26.1 C (-15.0 F)
1918
-27.8 C (-18.0 F)
1919
-25.0 C (-13.0 F)
1920
-22.2 C (-8.0 F)
1921
-20.0 C (-4.0 F)
1922
-25.0 C (-13.0 F)
1923
-20.6 C (-5.1 F)
1924
-25.0 C (-13.0 F)
1925
-32.2 C (-26.0 F)
1926
-24.4 C (-11.9 F)
1927
-20.6 C (-5.1 F)
1928
-22.2 C (-8.0 F)
1929
-23.3 C (-9.9 F)
1930
-23.9 C (-11.0 F)
1931
-18.9 C (-2.0 F)
1932
-20.0 C (-4.0 F)
1933
-21.7 C (-7.1 F)
1934
-28.9 C (-20.0 F)
1935
-26.1 C (-15.0 F)
1936
-28.3 C (-18.9 F)
1937
-17.8 C (0.0 F)
1938
-19.4 C (-2.9 F)
1939
-20.6 C (-5.1 F)
1940
1.1 C (34.0 F)
1943
-27.8 C (-18.0 F)
1944
-25.0 C (-13.0 F)
1948
n/a
1949
n/a
1950
n/a
1951
n/a
Wettest day (Rx1day)
The wettest day of the year at Grantsville, 1895 to 1951. The record is 106.4 mm (4.2 in) in 1909, marked on the chart; the median year is 50.3 mm (2.0 in).
Wettest day (Rx1day) at Grantsville by year
Year
Wettest day (Rx1day)
1895
38.1 mm (1.5 in)
1896
68.6 mm (2.7 in)
1897
40.6 mm (1.6 in)
1898
101.6 mm (4.0 in)
1899
76.2 mm (3.0 in)
1900
49.8 mm (2.0 in)
1901
55.4 mm (2.2 in)
1902
42.2 mm (1.7 in)
1903
30.0 mm (1.2 in)
1904
26.7 mm (1.1 in)
1905
50.8 mm (2.0 in)
1906
63.5 mm (2.5 in)
1907
63.5 mm (2.5 in)
1908
47.2 mm (1.9 in)
1909
106.4 mm (4.2 in)
1910
30.5 mm (1.2 in)
1911
50.8 mm (2.0 in)
1912
73.7 mm (2.9 in)
1913
42.4 mm (1.7 in)
1914
47.8 mm (1.9 in)
1915
41.9 mm (1.6 in)
1916
60.5 mm (2.4 in)
1917
35.6 mm (1.4 in)
1918
35.1 mm (1.4 in)
1919
38.1 mm (1.5 in)
1920
53.3 mm (2.1 in)
1921
89.4 mm (3.5 in)
1922
42.7 mm (1.7 in)
1923
38.4 mm (1.5 in)
1924
48.3 mm (1.9 in)
1925
43.2 mm (1.7 in)
1926
51.1 mm (2.0 in)
1927
57.2 mm (2.3 in)
1928
50.8 mm (2.0 in)
1929
89.4 mm (3.5 in)
1930
53.3 mm (2.1 in)
1931
46.2 mm (1.8 in)
1932
37.3 mm (1.5 in)
1933
46.0 mm (1.8 in)
1934
57.7 mm (2.3 in)
1935
64.3 mm (2.5 in)
1936
97.0 mm (3.8 in)
1937
53.3 mm (2.1 in)
1938
45.5 mm (1.8 in)
1939
57.4 mm (2.3 in)
1940
70.4 mm (2.8 in)
1943
37.3 mm (1.5 in)
1944
31.2 mm (1.2 in)
1948
51.6 mm (2.0 in)
1949
44.2 mm (1.7 in)
1950
65.8 mm (2.6 in)
1951
33.8 mm (1.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Grantsville, 1895 to 1951. The record is 151.7 mm (6.0 in) in 1911, marked on the chart; the median year is 88.0 mm (3.5 in).
Wettest five days (Rx5day) at Grantsville by year
Year
Wettest five days (Rx5day)
1895
66.0 mm (2.6 in)
1896
111.8 mm (4.4 in)
1897
87.1 mm (3.4 in)
1898
136.6 mm (5.4 in)
1899
114.8 mm (4.5 in)
1900
83.3 mm (3.3 in)
1901
85.4 mm (3.4 in)
1902
68.1 mm (2.7 in)
1903
63.6 mm (2.5 in)
1904
41.0 mm (1.6 in)
1905
57.2 mm (2.3 in)
1906
120.3 mm (4.7 in)
1907
109.2 mm (4.3 in)
1908
95.8 mm (3.8 in)
1909
132.8 mm (5.2 in)
1910
65.6 mm (2.6 in)
1911
151.7 mm (6.0 in)
1912
108.3 mm (4.3 in)
1913
64.2 mm (2.5 in)
1914
58.4 mm (2.3 in)
1915
62.2 mm (2.4 in)
1916
60.5 mm (2.4 in)
1917
68.7 mm (2.7 in)
1918
107.3 mm (4.2 in)
1919
65.3 mm (2.6 in)
1920
125.3 mm (4.9 in)
1921
120.6 mm (4.7 in)
1922
58.7 mm (2.3 in)
1923
79.8 mm (3.1 in)
1924
114.3 mm (4.5 in)
1925
57.2 mm (2.3 in)
1926
114.5 mm (4.5 in)
1927
95.9 mm (3.8 in)
1928
88.9 mm (3.5 in)
1929
132.3 mm (5.2 in)
1930
67.8 mm (2.7 in)
1931
92.4 mm (3.6 in)
1932
101.1 mm (4.0 in)
1933
86.9 mm (3.4 in)
1934
92.5 mm (3.6 in)
1935
128.3 mm (5.1 in)
1936
145.3 mm (5.7 in)
1937
111.0 mm (4.4 in)
1938
62.2 mm (2.4 in)
1939
74.1 mm (2.9 in)
1940
133.9 mm (5.3 in)
1943
54.4 mm (2.1 in)
1944
38.8 mm (1.5 in)
1948
80.4 mm (3.2 in)
1949
75.2 mm (3.0 in)
1950
104.0 mm (4.1 in)
1951
89.0 mm (3.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Grantsville, 1895 to 1951. The record is 33 days in 1908, marked on the chart; the median year is 14 days.
Longest dry spell (CDD) at Grantsville by year
Year
Longest dry spell (CDD)
1895
14 days
1896
15 days
1897
18 days
1898
14 days
1899
20 days
1900
18 days
1901
25 days
1902
19 days
1903
18 days
1904
18 days
1905
20 days
1906
16 days
1907
13 days
1908
33 days
1909
17 days
1910
14 days
1911
17 days
1912
19 days
1913
14 days
1914
13 days
1915
17 days
1916
11 days
1917
24 days
1918
19 days
1919
10 days
1920
27 days
1921
10 days
1922
14 days
1923
23 days
1924
26 days
1925
13 days
1926
11 days
1927
13 days
1928
12 days
1929
14 days
1930
16 days
1931
10 days
1932
15 days
1933
10 days
1934
14 days
1935
10 days
1936
18 days
1937
9 days
1938
12 days
1939
8 days
1940
7 days
1943
19 days
1944
8 days
1948
11 days
1949
14 days
1950
11 days
1951
10 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
32 years with a frost
Across 32 years with a frost, the median last spring frost at Grantsville falls on 23 May and the median first autumn frost on 26 September, which leaves a median of 126 days between them.
Fitted over all years, the growing season changes by -4.1 days per decade at this station.
Frost dates and growing season at Grantsville
Measure
Median, all years
Earliest period
Recent period (1899 to 1943)
Recent against earliest
Fitted trend
Last spring frost
23 May
n/a
23 May
n/a
+3.0 days per decade
First autumn frost
26 September
n/a
26 September
n/a
-1.2 days per decade
Growing days
126 days
n/a
126 days
n/a
-4.1 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
39 years, 1895 to 1950
A day with at least 48.1 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 120.5 mm (4.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Grantsville: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
48.1 mm (1.9 in)
5 years
63.4 mm (2.5 in)
10 years
74.9 mm (2.9 in)
25 years
91.5 mm (3.6 in)
50 years
105.3 mm (4.1 in)
Longer than the 39 years of record
100 years
120.5 mm (4.7 in)
Longer than the 39 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, 39 years of values from 1895 to 1950.
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: 106.4 mm (4.2 in) in 1909; 101.6 mm (4.0 in) in 1898; 89.4 mm (3.5 in) in 1921.
Download the Data
Data for Grantsville standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Grantsville 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.