Record envelope, standing records and threshold days for Kopperston (USC00464956), West Virginia, United States, with 32 years of record.
Key Facts for Kopperston
Kopperston (USC00464956) is a weather station in West Virginia, United States at 37.73 latitude and -81.58 longitude, 506 m (1,660 ft) above sea level.
The station reports from 1963 to 1994, 32 years of record.
1,464 records set at Kopperston still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Kopperston set a daily record high maximum temperature of 30.0 C (86.0 F) on 29 April 1994.
About the Station
Location: West Virginia, United States, 37.73 latitude, -81.58 longitude.
Elevation: 506 m (1,660 ft).
Period of record: 1963 to 1994, 32 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 Kopperston. 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 Kopperston, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
21.7 C (71.1 F)
-28.3 C (-18.9 F)
n/a
n/a
Feb
23.9 C (75.0 F)
-22.2 C (-8.0 F)
n/a
n/a
Mar
28.9 C (84.0 F)
-21.1 C (-6.0 F)
n/a
n/a
Apr
31.7 C (89.1 F)
-9.4 C (15.1 F)
n/a
n/a
May
32.2 C (90.0 F)
-2.8 C (27.0 F)
n/a
n/a
Jun
35.0 C (95.0 F)
0.0 C (32.0 F)
n/a
n/a
Jul
36.7 C (98.1 F)
5.0 C (41.0 F)
n/a
n/a
Aug
36.1 C (97.0 F)
3.9 C (39.0 F)
n/a
n/a
Sep
33.3 C (91.9 F)
-2.2 C (28.0 F)
n/a
n/a
Oct
27.8 C (82.0 F)
-6.7 C (19.9 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-14.4 C (6.1 F)
n/a
n/a
Dec
23.3 C (73.9 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 Kopperston still stand. 1977 holds the most, with 68.
Standing records at Kopperston by the year they were set
Year set
Standing records
1963
16
1964
54
1965
55
1966
57
1967
64
1968
35
1969
44
1970
64
1971
54
1972
41
1973
43
1974
60
1975
29
1976
55
1977
68
1978
36
1979
48
1980
40
1981
39
1982
57
1983
47
1984
52
1985
41
1986
48
1987
34
1988
67
1989
49
1990
34
1991
41
1992
41
1993
39
1994
12
Wettest Day of Each Month
Sep: 110.5 mm (4.4 in)
The wettest day on record for each calendar month at Kopperston. The most was 110.5 mm (4.4 in) on 29 September 1964.
Record daily precipitation for each month at Kopperston
Month
Record daily precipitation (mm)
Date
Jan
57.2 mm (2.3 in)
10 January 1974
Feb
50.8 mm (2.0 in)
26 February 1972
Mar
43.2 mm (1.7 in)
24 March 1979
Apr
82.0 mm (3.2 in)
4 April 1977
May
74.7 mm (2.9 in)
30 May 1974
Jun
68.1 mm (2.7 in)
21 June 1979
Jul
86.4 mm (3.4 in)
10 July 1980
Aug
74.4 mm (2.9 in)
31 August 1978
Sep
110.5 mm (4.4 in)
29 September 1964
Oct
51.6 mm (2.0 in)
17 October 1989
Nov
50.5 mm (2.0 in)
4 November 1985
Dec
63.5 mm (2.5 in)
30 December 1969
Period of Record Coverage
1963 to 1994
Complete yearUnder 90 percent of days
32 years of record at Kopperston, 1963 to 1994. 2 years have data for under 90 percent of days and are left out of rankings: 1963, 1994.
Cooler than the station meanWarmer than the station mean
One stripe for each of 28 complete years at Kopperston, 1964 to 1993. Blue stripes are years cooler than the station's own mean of 11.4 C (52.5 F); red stripes are warmer. The coolest year was 1992, at 10.0 C (50.0 F), and the warmest was 1973, at 12.5 C (54.6 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Kopperston as warming stripes, 1964 to 1993
Year
Annual mean temperature
Difference from the station mean
1964
11.8 C
+0.36 C
1965
12.0 C
+0.54 C
1967
11.3 C
-0.14 C
1969
11.0 C
-0.37 C
1970
11.9 C
+0.52 C
1971
12.0 C
+0.58 C
1972
11.6 C
+0.22 C
1973
12.5 C
+1.12 C
1974
12.1 C
+0.69 C
1975
12.3 C
+0.89 C
1976
10.8 C
-0.63 C
1977
11.2 C
-0.24 C
1978
11.2 C
-0.18 C
1979
11.3 C
-0.10 C
1980
11.2 C
-0.21 C
1981
10.6 C
-0.79 C
1982
11.8 C
+0.36 C
1983
11.5 C
+0.04 C
1984
11.8 C
+0.39 C
1985
11.8 C
+0.40 C
1986
12.2 C
+0.80 C
1987
11.4 C
-0.01 C
1988
10.4 C
-1.06 C
1989
10.5 C
-0.88 C
1990
11.8 C
+0.39 C
1991
11.4 C
-0.04 C
1992
10.0 C
-1.41 C
1993
10.1 C
-1.36 C
This station does not have enough complete years (30 are needed) to fit a temperature trend.
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
1963 to 1994
Yearly extremes at Kopperston: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.7 C (98.1 F)
1988
32.5 C (90.5 F)
32
Coldest night (TNn)
-28.3 C (-18.9 F)
1985
-20.3 C (-4.5 F)
32
Wettest day (Rx1day)
110.5 mm (4.4 in)
1964
52.0 mm (2.0 in)
32
Wettest five days (Rx5day)
229.2 mm (9.0 in)
1964
101.9 mm (4.0 in)
32
Longest dry spell (CDD)
24 days
1967
14 days
32
Hottest day (TXx)
The hottest day of the year at Kopperston, 1963 to 1994. The record is 36.7 C (98.1 F) in 1988, marked on the chart; the median year is 32.5 C (90.5 F).
Hottest day (TXx) at Kopperston by year
Year
Hottest day (TXx)
1963
26.7 C (80.1 F)
1964
32.8 C (91.0 F)
1965
33.3 C (91.9 F)
1966
33.3 C (91.9 F)
1967
32.2 C (90.0 F)
1968
32.8 C (91.0 F)
1969
32.8 C (91.0 F)
1970
33.9 C (93.0 F)
1971
32.8 C (91.0 F)
1972
32.2 C (90.0 F)
1973
33.3 C (91.9 F)
1974
32.2 C (90.0 F)
1975
32.2 C (90.0 F)
1976
33.3 C (91.9 F)
1977
33.9 C (93.0 F)
1978
33.9 C (93.0 F)
1979
31.7 C (89.1 F)
1980
33.3 C (91.9 F)
1981
30.6 C (87.1 F)
1982
30.0 C (86.0 F)
1983
36.1 C (97.0 F)
1984
32.2 C (90.0 F)
1985
31.1 C (88.0 F)
1986
32.2 C (90.0 F)
1987
34.4 C (93.9 F)
1988
36.7 C (98.1 F)
1989
31.7 C (89.1 F)
1990
32.2 C (90.0 F)
1991
31.1 C (88.0 F)
1992
30.6 C (87.1 F)
1993
33.3 C (91.9 F)
1994
30.0 C (86.0 F)
Coldest night (TNn)
The coldest night of the year at Kopperston, 1963 to 1994. The record is -28.3 C (-18.9 F) in 1985, marked on the chart; the median year is -20.3 C (-4.5 F).
Coldest night (TNn) at Kopperston by year
Year
Coldest night (TNn)
1963
-19.4 C (-2.9 F)
1964
-18.3 C (-0.9 F)
1965
-17.8 C (0.0 F)
1966
-21.1 C (-6.0 F)
1967
-19.4 C (-2.9 F)
1968
-21.7 C (-7.1 F)
1969
-15.6 C (3.9 F)
1970
-25.0 C (-13.0 F)
1971
-18.9 C (-2.0 F)
1972
-23.3 C (-9.9 F)
1973
-17.2 C (1.0 F)
1974
-13.9 C (7.0 F)
1975
-15.0 C (5.0 F)
1976
-19.4 C (-2.9 F)
1977
-26.7 C (-16.1 F)
1978
-22.2 C (-8.0 F)
1979
-20.6 C (-5.1 F)
1980
-21.1 C (-6.0 F)
1981
-20.0 C (-4.0 F)
1982
-26.1 C (-15.0 F)
1983
-26.1 C (-15.0 F)
1984
-23.3 C (-9.9 F)
1985
-28.3 C (-18.9 F)
1986
-18.9 C (-2.0 F)
1987
-21.7 C (-7.1 F)
1988
-18.3 C (-0.9 F)
1989
-25.6 C (-14.1 F)
1990
-16.1 C (3.0 F)
1991
-16.7 C (1.9 F)
1992
-15.6 C (3.9 F)
1993
-20.6 C (-5.1 F)
1994
-27.8 C (-18.0 F)
Wettest day (Rx1day)
The wettest day of the year at Kopperston, 1963 to 1994. The record is 110.5 mm (4.4 in) in 1964, marked on the chart; the median year is 52.0 mm (2.0 in).
Wettest day (Rx1day) at Kopperston by year
Year
Wettest day (Rx1day)
1963
50.0 mm (2.0 in)
1964
110.5 mm (4.4 in)
1965
38.1 mm (1.5 in)
1966
53.1 mm (2.1 in)
1967
43.2 mm (1.7 in)
1968
62.7 mm (2.5 in)
1969
63.5 mm (2.5 in)
1970
47.0 mm (1.9 in)
1971
69.1 mm (2.7 in)
1972
58.2 mm (2.3 in)
1973
50.8 mm (2.0 in)
1974
74.7 mm (2.9 in)
1975
42.4 mm (1.7 in)
1976
33.5 mm (1.3 in)
1977
82.0 mm (3.2 in)
1978
74.4 mm (2.9 in)
1979
68.1 mm (2.7 in)
1980
86.4 mm (3.4 in)
1981
47.0 mm (1.9 in)
1982
55.4 mm (2.2 in)
1983
49.0 mm (1.9 in)
1984
42.2 mm (1.7 in)
1985
61.5 mm (2.4 in)
1986
46.0 mm (1.8 in)
1987
41.7 mm (1.6 in)
1988
45.7 mm (1.8 in)
1989
58.9 mm (2.3 in)
1990
38.1 mm (1.5 in)
1991
54.9 mm (2.2 in)
1992
38.1 mm (1.5 in)
1993
50.8 mm (2.0 in)
1994
59.9 mm (2.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Kopperston, 1963 to 1994. The record is 229.2 mm (9.0 in) in 1964, marked on the chart; the median year is 101.9 mm (4.0 in).
Wettest five days (Rx5day) at Kopperston by year
Year
Wettest five days (Rx5day)
1963
61.2 mm (2.4 in)
1964
229.2 mm (9.0 in)
1965
63.2 mm (2.5 in)
1966
97.8 mm (3.9 in)
1967
94.8 mm (3.7 in)
1968
89.4 mm (3.5 in)
1969
114.3 mm (4.5 in)
1970
97.8 mm (3.9 in)
1971
114.8 mm (4.5 in)
1972
107.0 mm (4.2 in)
1973
96.5 mm (3.8 in)
1974
125.1 mm (4.9 in)
1975
75.4 mm (3.0 in)
1976
89.1 mm (3.5 in)
1977
126.7 mm (5.0 in)
1978
105.9 mm (4.2 in)
1979
126.9 mm (5.0 in)
1980
188.0 mm (7.4 in)
1981
101.6 mm (4.0 in)
1982
110.8 mm (4.4 in)
1983
118.1 mm (4.6 in)
1984
129.2 mm (5.1 in)
1985
131.6 mm (5.2 in)
1986
102.1 mm (4.0 in)
1987
84.1 mm (3.3 in)
1988
69.8 mm (2.7 in)
1989
123.5 mm (4.9 in)
1990
63.8 mm (2.5 in)
1991
102.4 mm (4.0 in)
1992
77.5 mm (3.1 in)
1993
83.3 mm (3.3 in)
1994
95.0 mm (3.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Kopperston, 1963 to 1994. The record is 24 days in 1967, marked on the chart; the median year is 14 days.
Longest dry spell (CDD) at Kopperston by year
Year
Longest dry spell (CDD)
1963
11 days
1964
13 days
1965
16 days
1966
18 days
1967
24 days
1968
17 days
1969
13 days
1970
22 days
1971
12 days
1972
11 days
1973
16 days
1974
16 days
1975
13 days
1976
10 days
1977
14 days
1978
10 days
1979
11 days
1980
12 days
1981
15 days
1982
13 days
1983
14 days
1984
17 days
1985
24 days
1986
15 days
1987
19 days
1988
12 days
1989
14 days
1990
15 days
1991
18 days
1992
11 days
1993
20 days
1994
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
28 years with a frost
Across 28 years with a frost, the median last spring frost at Kopperston falls on 3 May and the median first autumn frost on 8 October, which leaves a median of 160 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 Kopperston
Measure
Median, all years
Earliest period
Recent period (1964 to 1993)
Recent against earliest
Fitted trend
Last spring frost
3 May
n/a
3 May
n/a
+1.9 days per decade
First autumn frost
8 October
n/a
8 October
n/a
+1.0 days per decade
Growing days
160 days
n/a
160 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
30 years, 1964 to 1993
A day with at least 52.3 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 119.9 mm (4.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Kopperston: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
52.3 mm (2.1 in)
5 years
67.2 mm (2.6 in)
10 years
78.3 mm (3.1 in)
25 years
93.7 mm (3.7 in)
50 years
106.3 mm (4.2 in)
Longer than the 30 years of record
100 years
119.9 mm (4.7 in)
Longer than the 30 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, 30 years of values from 1964 to 1993.
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: 110.5 mm (4.4 in) in 1964; 86.4 mm (3.4 in) in 1980; 82.0 mm (3.2 in) in 1977.
Download the Data
Data for Kopperston standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Kopperston 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.