Record envelope, standing records and threshold days for Charleston 1 (USC00461575), West Virginia, United States, with 83 years of record.
Key Facts for Charleston 1
Charleston 1 (USC00461575) is a weather station in West Virginia, United States at 38.35 latitude and -81.65 longitude, 183 m (600 ft) above sea level.
The station reports from 1892 to 1974, 83 years of record.
1,464 records set at Charleston 1 still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Charleston 1 tied a daily record snow depth of 10.2 cm (4.0 in) on 10 February 1974.
About the Station
Location: West Virginia, United States, 38.35 latitude, -81.65 longitude.
Elevation: 183 m (600 ft).
Period of record: 1892 to 1974, 83 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 Charleston 1. 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 Charleston 1, 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)
-24.4 C (-11.9 F)
n/a
n/a
Feb
26.7 C (80.1 F)
-23.9 C (-11.0 F)
n/a
n/a
Mar
33.3 C (91.9 F)
-16.7 C (1.9 F)
n/a
n/a
Apr
35.6 C (96.1 F)
-7.8 C (18.0 F)
n/a
n/a
May
36.7 C (98.1 F)
-2.2 C (28.0 F)
n/a
n/a
Jun
40.6 C (105.1 F)
1.7 C (35.1 F)
n/a
n/a
Jul
42.2 C (108.0 F)
7.8 C (46.0 F)
n/a
n/a
Aug
42.2 C (108.0 F)
6.7 C (44.1 F)
n/a
n/a
Sep
40.0 C (104.0 F)
0.6 C (33.1 F)
n/a
n/a
Oct
36.1 C (97.0 F)
-7.2 C (19.0 F)
n/a
n/a
Nov
31.1 C (88.0 F)
-14.4 C (6.1 F)
n/a
n/a
Dec
26.7 C (80.1 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 Charleston 1 still stand. 1931 holds the most, with 55.
Standing records at Charleston 1 by the year they were set
Year set
Standing records
1892
18
1902
1
1903
36
1904
23
1905
19
1906
20
1907
17
1908
11
1909
17
1910
15
1911
31
1912
16
1913
20
1914
35
1915
7
1916
13
1917
20
1918
19
1919
15
1920
17
1921
9
1922
4
1923
18
1924
24
1925
41
1926
19
1927
42
1928
24
1929
33
1930
49
1931
55
1932
30
1933
22
1934
27
1935
20
1936
26
1937
35
1938
13
1939
11
1940
22
1941
13
1943
10
1944
11
1945
13
1946
12
1947
26
1948
20
1949
15
1950
26
1951
20
1952
16
1953
13
1954
21
1955
16
1956
17
1957
15
1958
11
1959
19
1960
14
1961
20
1962
26
1963
33
1964
19
1965
14
1966
24
1967
23
1968
17
1969
8
1970
16
1971
19
1972
28
1973
15
All-Time Record Progression
5 new records
5 all-time records were set at Charleston 1 between 25 November 1950 and 9 January 1970. Each dot is a new record.
When Charleston 1 set new all-time records
Date
Kind
Detail
1950-11-25
Record daily snowfall
Record daily snowfall 36.6 cm (14.4 in)
1957-07-10
Record daily precipitation
Record daily precipitation 99.1 mm (3.9 in)
1961-07-20
Record daily precipitation
Record daily precipitation 134.9 mm (5.3 in)
1963-01-25
Record low maximum temperature
Record low maximum temperature -12.2 C (10.0 F)
1970-01-09
Record low maximum temperature
Record low maximum temperature -13.3 C (8.1 F)
Wettest Day of Each Month
Jul: 134.9 mm (5.3 in)
The wettest day on record for each calendar month at Charleston 1. The most was 134.9 mm (5.3 in) on 20 July 1961.
Record daily precipitation for each month at Charleston 1
Month
Record daily precipitation (mm)
Date
Jan
62.2 mm (2.4 in)
1 January 1945
Feb
60.2 mm (2.4 in)
1 February 1951
Mar
58.4 mm (2.3 in)
19 March 1933
Apr
53.3 mm (2.1 in)
15 April 1922
May
60.5 mm (2.4 in)
27 May 1917
Jun
69.1 mm (2.7 in)
27 June 1910
Jul
134.9 mm (5.3 in)
20 July 1961
Aug
83.1 mm (3.3 in)
23 August 1942
Sep
87.6 mm (3.4 in)
25 September 1940
Oct
58.4 mm (2.3 in)
1 October 1915
Nov
65.5 mm (2.6 in)
16 November 1926
Dec
55.9 mm (2.2 in)
7 December 1919
Period of Record Coverage
1892 to 1974
Complete yearUnder 90 percent of days
73 years of record at Charleston 1, 1892 to 1974. 11 years have data for under 90 percent of days and are left out of rankings: 1892, 1902, 1903, 1920, 1924, 1933, 1934, 1941 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 60 complete years at Charleston 1, 1905 to 1973. Blue stripes are years cooler than the station's own mean of 13.6 C (56.5 F); red stripes are warmer. The coolest year was 1963, at 11.8 C (53.2 F), and the warmest was 1921, at 15.5 C (59.9 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Charleston 1 as warming stripes, 1905 to 1973
Year
Annual mean temperature
Difference from the station mean
1905
13.9 C
+0.26 C
1906
14.5 C
+0.90 C
1907
13.7 C
+0.09 C
1908
14.4 C
+0.78 C
1909
14.2 C
+0.60 C
1910
13.6 C
+0.03 C
1911
15.3 C
+1.70 C
1912
13.4 C
-0.24 C
1913
15.1 C
+1.48 C
1914
13.9 C
+0.24 C
1915
14.1 C
+0.45 C
1918
14.3 C
+0.71 C
1919
14.9 C
+1.33 C
1921
15.5 C
+1.90 C
1922
14.4 C
+0.79 C
1923
14.1 C
+0.45 C
1925
13.4 C
-0.21 C
1926
12.6 C
-0.98 C
1927
13.5 C
-0.08 C
1928
13.2 C
-0.38 C
1929
13.9 C
+0.29 C
1930
14.3 C
+0.70 C
1931
15.0 C
+1.39 C
1932
14.6 C
+1.02 C
1933
14.3 C
+0.68 C
1935
14.3 C
+0.65 C
1936
14.2 C
+0.55 C
1937
12.5 C
-1.09 C
1938
14.4 C
+0.77 C
1939
14.3 C
+0.66 C
1940
12.5 C
-1.15 C
1945
13.3 C
-0.30 C
1946
14.3 C
+0.68 C
1947
13.4 C
-0.19 C
1948
13.4 C
-0.17 C
1949
14.3 C
+0.69 C
1950
13.1 C
-0.52 C
1951
13.1 C
-0.50 C
1952
13.6 C
+0.03 C
1953
14.0 C
+0.42 C
1954
13.5 C
-0.10 C
1955
13.4 C
-0.17 C
1956
13.4 C
-0.18 C
1957
13.7 C
+0.12 C
1958
11.8 C
-1.79 C
1959
13.6 C
-0.02 C
1960
12.4 C
-1.23 C
1961
12.8 C
-0.84 C
1962
12.8 C
-0.86 C
1963
11.8 C
-1.85 C
1964
13.2 C
-0.37 C
1965
13.3 C
-0.33 C
1966
12.4 C
-1.26 C
1967
12.6 C
-0.98 C
1968
12.5 C
-1.09 C
1969
12.4 C
-1.18 C
1970
13.2 C
-0.40 C
1971
12.8 C
-0.81 C
1972
12.6 C
-0.97 C
1973
13.7 C
+0.11 C
The annual mean temperature here has fallen by 0.3 C (0.2 to 0.3) per decade over 1905 to 1973. In Fahrenheit: 0.5 F (0.3 to 0.6) per decade. The slope is a straight line fitted to 60 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Charleston 1
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.3 C (-0.3 to -0.2) per decade
-0.5 F (-0.6 to -0.3) per decade
1905 to 1973
60
Fall
Mean daily maximum
-0.3 C (-0.4 to -0.2) per decade
-0.5 F (-0.8 to -0.3) per decade
1905 to 1973
60
Fall
Mean daily minimum
-0.2 C (-0.3 to -0.1) per decade
-0.4 F (-0.5 to -0.2) per decade
1905 to 1973
60
Fall
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
1892 to 1974
Yearly extremes at Charleston 1: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.2 C (108.0 F)
1918
36.1 C (97.0 F)
73
Coldest night (TNn)
-27.2 C (-17.0 F)
1917
-16.7 C (1.9 F)
73
Wettest day (Rx1day)
134.9 mm (5.3 in)
1961
52.2 mm (2.1 in)
74
Wettest five days (Rx5day)
186.5 mm (7.3 in)
1932
89.9 mm (3.5 in)
74
Longest dry spell (CDD)
30 days
1909
16 days
74
Hottest day (TXx)
The hottest day of the year at Charleston 1, 1892 to 1974. The record is 42.2 C (108.0 F) in 1918, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Charleston 1 by year
Year
Hottest day (TXx)
1892
36.7 C (98.1 F)
1902
36.1 C (97.0 F)
1903
38.9 C (102.0 F)
1904
34.4 C (93.9 F)
1905
33.9 C (93.0 F)
1906
33.9 C (93.0 F)
1907
32.8 C (91.0 F)
1908
37.2 C (99.0 F)
1909
34.4 C (93.9 F)
1910
33.3 C (91.9 F)
1911
37.8 C (100.0 F)
1912
34.4 C (93.9 F)
1913
35.0 C (95.0 F)
1914
37.8 C (100.0 F)
1915
36.7 C (98.1 F)
1916
36.1 C (97.0 F)
1917
37.2 C (99.0 F)
1918
42.2 C (108.0 F)
1919
37.8 C (100.0 F)
1920
37.2 C (99.0 F)
1921
36.1 C (97.0 F)
1922
36.7 C (98.1 F)
1923
34.4 C (93.9 F)
1924
35.6 C (96.1 F)
1925
38.9 C (102.0 F)
1926
39.4 C (102.9 F)
1927
35.6 C (96.1 F)
1928
37.8 C (100.0 F)
1929
39.4 C (102.9 F)
1930
41.1 C (106.0 F)
1931
42.2 C (108.0 F)
1932
40.0 C (104.0 F)
1933
37.2 C (99.0 F)
1934
41.1 C (106.0 F)
1935
35.6 C (96.1 F)
1936
38.9 C (102.0 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
37.8 C (100.0 F)
1942
n/a
1943
37.2 C (99.0 F)
1944
33.3 C (91.9 F)
1945
36.1 C (97.0 F)
1946
37.8 C (100.0 F)
1947
37.8 C (100.0 F)
1948
40.6 C (105.1 F)
1949
35.6 C (96.1 F)
1950
35.0 C (95.0 F)
1951
35.6 C (96.1 F)
1952
36.7 C (98.1 F)
1953
39.4 C (102.9 F)
1954
39.4 C (102.9 F)
1955
37.2 C (99.0 F)
1956
35.6 C (96.1 F)
1957
37.2 C (99.0 F)
1958
33.9 C (93.0 F)
1959
36.7 C (98.1 F)
1960
34.4 C (93.9 F)
1961
35.0 C (95.0 F)
1962
35.0 C (95.0 F)
1963
34.4 C (93.9 F)
1964
36.7 C (98.1 F)
1965
36.7 C (98.1 F)
1966
36.7 C (98.1 F)
1967
33.9 C (93.0 F)
1968
35.0 C (95.0 F)
1969
35.0 C (95.0 F)
1970
35.6 C (96.1 F)
1971
33.3 C (91.9 F)
1972
35.0 C (95.0 F)
1973
35.6 C (96.1 F)
1974
23.3 C (73.9 F)
Coldest night (TNn)
The coldest night of the year at Charleston 1, 1892 to 1974. The record is -27.2 C (-17.0 F) in 1917, marked on the chart; the median year is -16.7 C (1.9 F).
Coldest night (TNn) at Charleston 1 by year
Year
Coldest night (TNn)
1892
-3.3 C (26.1 F)
1902
13.9 C (57.0 F)
1903
-23.9 C (-11.0 F)
1904
-16.7 C (1.9 F)
1905
-18.9 C (-2.0 F)
1906
-12.2 C (10.0 F)
1907
-15.0 C (5.0 F)
1908
-12.8 C (9.0 F)
1909
-15.0 C (5.0 F)
1910
-12.8 C (9.0 F)
1911
-11.1 C (12.0 F)
1912
-21.1 C (-6.0 F)
1913
-12.2 C (10.0 F)
1914
-17.8 C (0.0 F)
1915
-12.2 C (10.0 F)
1916
-17.2 C (1.0 F)
1917
-27.2 C (-17.0 F)
1918
-22.8 C (-9.0 F)
1919
-17.2 C (1.0 F)
1920
-17.8 C (0.0 F)
1921
-11.1 C (12.0 F)
1922
-13.3 C (8.1 F)
1923
-17.8 C (0.0 F)
1924
-18.9 C (-2.0 F)
1925
-22.2 C (-8.0 F)
1926
-16.7 C (1.9 F)
1927
-18.9 C (-2.0 F)
1928
-20.6 C (-5.1 F)
1929
-16.7 C (1.9 F)
1930
-16.1 C (3.0 F)
1931
-12.8 C (9.0 F)
1932
-13.9 C (7.0 F)
1933
-16.7 C (1.9 F)
1934
-19.4 C (-2.9 F)
1935
-15.6 C (3.9 F)
1936
-22.8 C (-9.0 F)
1937
-12.2 C (10.0 F)
1938
-11.7 C (10.9 F)
1939
-12.8 C (9.0 F)
1940
-18.9 C (-2.0 F)
1941
-13.3 C (8.1 F)
1942
n/a
1943
-13.9 C (7.0 F)
1944
-15.0 C (5.0 F)
1945
-15.6 C (3.9 F)
1946
-15.0 C (5.0 F)
1947
-15.6 C (3.9 F)
1948
-19.4 C (-2.9 F)
1949
-11.1 C (12.0 F)
1950
-13.9 C (7.0 F)
1951
-17.2 C (1.0 F)
1952
-11.1 C (12.0 F)
1953
-12.2 C (10.0 F)
1954
-16.1 C (3.0 F)
1955
-17.2 C (1.0 F)
1956
-11.7 C (10.9 F)
1957
-20.0 C (-4.0 F)
1958
-16.1 C (3.0 F)
1959
-17.2 C (1.0 F)
1960
-15.6 C (3.9 F)
1961
-20.6 C (-5.1 F)
1962
-20.6 C (-5.1 F)
1963
-24.4 C (-11.9 F)
1964
-17.8 C (0.0 F)
1965
-16.1 C (3.0 F)
1966
-18.9 C (-2.0 F)
1967
-16.7 C (1.9 F)
1968
-20.0 C (-4.0 F)
1969
-18.9 C (-2.0 F)
1970
-21.7 C (-7.1 F)
1971
-17.2 C (1.0 F)
1972
-21.1 C (-6.0 F)
1973
-15.0 C (5.0 F)
1974
-9.4 C (15.1 F)
Wettest day (Rx1day)
The wettest day of the year at Charleston 1, 1892 to 1974. The record is 134.9 mm (5.3 in) in 1961, marked on the chart; the median year is 52.2 mm (2.1 in).
Wettest day (Rx1day) at Charleston 1 by year
Year
Wettest day (Rx1day)
1892
34.8 mm (1.4 in)
1902
27.4 mm (1.1 in)
1903
48.5 mm (1.9 in)
1904
33.8 mm (1.3 in)
1905
54.6 mm (2.1 in)
1906
35.6 mm (1.4 in)
1907
47.5 mm (1.9 in)
1908
48.3 mm (1.9 in)
1909
69.9 mm (2.8 in)
1910
69.1 mm (2.7 in)
1911
52.1 mm (2.1 in)
1912
33.5 mm (1.3 in)
1913
56.4 mm (2.2 in)
1914
58.4 mm (2.3 in)
1915
58.4 mm (2.3 in)
1916
44.5 mm (1.8 in)
1917
61.0 mm (2.4 in)
1918
63.0 mm (2.5 in)
1919
55.9 mm (2.2 in)
1920
48.3 mm (1.9 in)
1921
48.8 mm (1.9 in)
1922
53.3 mm (2.1 in)
1923
53.3 mm (2.1 in)
1924
39.6 mm (1.6 in)
1925
44.5 mm (1.8 in)
1926
65.5 mm (2.6 in)
1927
38.1 mm (1.5 in)
1928
33.0 mm (1.3 in)
1929
46.2 mm (1.8 in)
1930
43.9 mm (1.7 in)
1931
53.3 mm (2.1 in)
1932
94.0 mm (3.7 in)
1933
58.4 mm (2.3 in)
1934
56.4 mm (2.2 in)
1935
51.3 mm (2.0 in)
1936
48.3 mm (1.9 in)
1937
56.9 mm (2.2 in)
1938
73.7 mm (2.9 in)
1939
59.4 mm (2.3 in)
1940
87.6 mm (3.4 in)
1941
50.8 mm (2.0 in)
1942
83.1 mm (3.3 in)
1943
36.8 mm (1.4 in)
1944
36.8 mm (1.4 in)
1945
62.2 mm (2.4 in)
1946
41.1 mm (1.6 in)
1947
55.9 mm (2.2 in)
1948
52.3 mm (2.1 in)
1949
46.2 mm (1.8 in)
1950
68.6 mm (2.7 in)
1951
60.2 mm (2.4 in)
1952
45.5 mm (1.8 in)
1953
46.2 mm (1.8 in)
1954
68.3 mm (2.7 in)
1955
57.2 mm (2.3 in)
1956
58.4 mm (2.3 in)
1957
99.1 mm (3.9 in)
1958
58.2 mm (2.3 in)
1959
51.6 mm (2.0 in)
1960
43.2 mm (1.7 in)
1961
134.9 mm (5.3 in)
1962
52.8 mm (2.1 in)
1963
34.3 mm (1.4 in)
1964
31.2 mm (1.2 in)
1965
36.3 mm (1.4 in)
1966
30.7 mm (1.2 in)
1967
53.6 mm (2.1 in)
1968
42.7 mm (1.7 in)
1969
76.5 mm (3.0 in)
1970
46.7 mm (1.8 in)
1971
65.8 mm (2.6 in)
1972
45.0 mm (1.8 in)
1973
62.0 mm (2.4 in)
1974
36.8 mm (1.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Charleston 1, 1892 to 1974. The record is 186.5 mm (7.3 in) in 1932, marked on the chart; the median year is 89.9 mm (3.5 in).
Wettest five days (Rx5day) at Charleston 1 by year
Year
Wettest five days (Rx5day)
1892
90.4 mm (3.6 in)
1902
58.7 mm (2.3 in)
1903
52.1 mm (2.1 in)
1904
65.3 mm (2.6 in)
1905
75.5 mm (3.0 in)
1906
67.4 mm (2.7 in)
1907
83.1 mm (3.3 in)
1908
105.9 mm (4.2 in)
1909
84.9 mm (3.3 in)
1910
102.1 mm (4.0 in)
1911
152.3 mm (6.0 in)
1912
57.0 mm (2.2 in)
1913
73.6 mm (2.9 in)
1914
120.6 mm (4.7 in)
1915
104.1 mm (4.1 in)
1916
70.2 mm (2.8 in)
1917
92.5 mm (3.6 in)
1918
107.2 mm (4.2 in)
1919
111.6 mm (4.4 in)
1920
110.5 mm (4.4 in)
1921
106.0 mm (4.2 in)
1922
100.7 mm (4.0 in)
1923
84.9 mm (3.3 in)
1924
86.6 mm (3.4 in)
1925
105.0 mm (4.1 in)
1926
109.8 mm (4.3 in)
1927
84.3 mm (3.3 in)
1928
65.5 mm (2.6 in)
1929
82.3 mm (3.2 in)
1930
65.2 mm (2.6 in)
1931
113.8 mm (4.5 in)
1932
186.5 mm (7.3 in)
1933
80.9 mm (3.2 in)
1934
81.5 mm (3.2 in)
1935
79.3 mm (3.1 in)
1936
67.1 mm (2.6 in)
1937
105.0 mm (4.1 in)
1938
98.3 mm (3.9 in)
1939
108.6 mm (4.3 in)
1940
92.9 mm (3.7 in)
1941
87.2 mm (3.4 in)
1942
101.8 mm (4.0 in)
1943
80.3 mm (3.2 in)
1944
70.6 mm (2.8 in)
1945
114.4 mm (4.5 in)
1946
70.4 mm (2.8 in)
1947
78.3 mm (3.1 in)
1948
99.0 mm (3.9 in)
1949
129.3 mm (5.1 in)
1950
105.9 mm (4.2 in)
1951
92.7 mm (3.6 in)
1952
65.1 mm (2.6 in)
1953
80.3 mm (3.2 in)
1954
93.2 mm (3.7 in)
1955
95.8 mm (3.8 in)
1956
97.1 mm (3.8 in)
1957
100.6 mm (4.0 in)
1958
123.5 mm (4.9 in)
1959
70.1 mm (2.8 in)
1960
60.2 mm (2.4 in)
1961
169.2 mm (6.7 in)
1962
91.0 mm (3.6 in)
1963
63.7 mm (2.5 in)
1964
58.4 mm (2.3 in)
1965
64.5 mm (2.5 in)
1966
75.4 mm (3.0 in)
1967
88.9 mm (3.5 in)
1968
74.0 mm (2.9 in)
1969
94.3 mm (3.7 in)
1970
99.0 mm (3.9 in)
1971
90.7 mm (3.6 in)
1972
92.3 mm (3.6 in)
1973
89.4 mm (3.5 in)
1974
62.8 mm (2.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Charleston 1, 1892 to 1974. The record is 30 days in 1909, marked on the chart; the median year is 16 days.
Longest dry spell (CDD) at Charleston 1 by year
Year
Longest dry spell (CDD)
1892
11 days
1902
9 days
1903
26 days
1904
20 days
1905
18 days
1906
10 days
1907
19 days
1908
21 days
1909
30 days
1910
20 days
1911
27 days
1912
19 days
1913
15 days
1914
19 days
1915
15 days
1916
10 days
1917
16 days
1918
13 days
1919
15 days
1920
25 days
1921
15 days
1922
24 days
1923
25 days
1924
25 days
1925
14 days
1926
14 days
1927
14 days
1928
12 days
1929
18 days
1930
21 days
1931
19 days
1932
19 days
1933
14 days
1934
14 days
1935
16 days
1936
21 days
1937
15 days
1938
21 days
1939
15 days
1940
14 days
1941
20 days
1942
16 days
1943
20 days
1944
14 days
1945
13 days
1946
22 days
1947
15 days
1948
13 days
1949
16 days
1950
13 days
1951
13 days
1952
29 days
1953
24 days
1954
13 days
1955
29 days
1956
14 days
1957
24 days
1958
16 days
1959
27 days
1960
12 days
1961
13 days
1962
12 days
1963
28 days
1964
13 days
1965
19 days
1966
16 days
1967
16 days
1968
13 days
1969
24 days
1970
16 days
1971
19 days
1972
10 days
1973
18 days
1974
9 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
60 years with a frost
Across 60 years with a frost, the median last spring frost at Charleston 1 falls on 17 April and the median first autumn frost on 29 October, which leaves a median of 193 days between them.
In 1940 to 1973 the median growing season was 192 days. That is 2 days fewer than in 1905 to 1939.
Fitted over all years, the growing season changes by -2.1 days per decade at this station.
Frost dates and growing season at Charleston 1
Measure
Median, all years
Earliest period (1905 to 1939)
Recent period (1940 to 1973)
Recent against earliest
Fitted trend
Last spring frost
17 April
16 April
18 April
2 days later
+1.8 days per decade
First autumn frost
29 October
30 October
28 October
2 days earlier
-0.3 days per decade
Growing days
193 days
194 days
192 days
2 days fewer
-2.1 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
66 years, 1904 to 1973
A day with at least 51.2 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 112.7 mm (4.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Charleston 1: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
51.2 mm (2.0 in)
5 years
65.5 mm (2.6 in)
10 years
75.8 mm (3.0 in)
25 years
89.8 mm (3.5 in)
50 years
101.0 mm (4.0 in)
100 years
112.7 mm (4.4 in)
Longer than the 66 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, 66 years of values from 1904 to 1973.
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: 134.9 mm (5.3 in) in 1961; 99.1 mm (3.9 in) in 1957; 94.0 mm (3.7 in) in 1932.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Charleston 1, at 1938. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1938 ran 0.6 C (1.1 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Charleston 1, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1938
-0.6
-1.1
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 Charleston 1 standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Charleston 1 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.