Record envelope, standing records and threshold days for Rocky Knob (USC00447330), Virginia, United States, with 36 years of record.
Key Facts for Rocky Knob
Rocky Knob (USC00447330) is a weather station in Virginia, United States at 36.85 latitude and -80.37 longitude, 939 m (3,081 ft) above sea level.
The station reports from 1940 to 1975, 36 years of record.
1,464 records set at Rocky Knob still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Rocky Knob tied a daily record low maximum temperature of 2.2 C (36.0 F) on 23 November 1975.
About the Station
Location: Virginia, United States, 36.85 latitude, -80.37 longitude.
Elevation: 939 m (3,081 ft).
Period of record: 1940 to 1975, 36 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 Rocky Knob. 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 Rocky Knob, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
22.2 C (72.0 F)
-23.9 C (-11.0 F)
n/a
n/a
Feb
21.1 C (70.0 F)
-21.7 C (-7.1 F)
n/a
n/a
Mar
26.7 C (80.1 F)
-16.7 C (1.9 F)
n/a
n/a
Apr
29.4 C (84.9 F)
-9.4 C (15.1 F)
n/a
n/a
May
33.3 C (91.9 F)
-4.4 C (24.1 F)
n/a
n/a
Jun
32.8 C (91.0 F)
1.1 C (34.0 F)
n/a
n/a
Jul
33.9 C (93.0 F)
7.2 C (45.0 F)
n/a
n/a
Aug
32.2 C (90.0 F)
5.0 C (41.0 F)
n/a
n/a
Sep
31.7 C (89.1 F)
-1.1 C (30.0 F)
n/a
n/a
Oct
31.7 C (89.1 F)
-7.2 C (19.0 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-17.8 C (0.0 F)
n/a
n/a
Dec
21.1 C (70.0 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 Rocky Knob still stand. 1941 holds the most, with 143.
Standing records at Rocky Knob by the year they were set
Year set
Standing records
1940
46
1941
143
1942
51
1943
65
1944
27
1945
67
1946
46
1947
47
1948
35
1949
29
1950
53
1951
38
1952
53
1953
32
1954
41
1955
35
1956
57
1957
30
1958
28
1959
35
1960
35
1961
43
1962
43
1963
45
1964
35
1965
31
1966
35
1967
42
1968
31
1969
40
1970
27
1971
23
1972
33
1973
26
1974
6
1975
11
All-Time Record Progression
1 new records
1 all-time records were set at Rocky Knob between 8 January 1970 and 8 January 1970. Each dot is a new record.
When Rocky Knob set new all-time records
Date
Kind
Detail
1970-01-08
Record low minimum temperature
Record low minimum temperature -23.9 C (-11.0 F)
Wettest Day of Each Month
Sep: 188.2 mm (7.4 in)
The wettest day on record for each calendar month at Rocky Knob. The most was 188.2 mm (7.4 in) on 30 September 1959.
Record daily precipitation for each month at Rocky Knob
Month
Record daily precipitation (mm)
Date
Jan
63.0 mm (2.5 in)
2 January 1944
Feb
89.2 mm (3.5 in)
13 February 1966
Mar
82.8 mm (3.3 in)
11 March 1952
Apr
81.3 mm (3.2 in)
19 April 1943
May
95.3 mm (3.8 in)
28 May 1973
Jun
167.4 mm (6.6 in)
21 June 1972
Jul
94.2 mm (3.7 in)
9 July 1946
Aug
172.7 mm (6.8 in)
31 August 1964
Sep
188.2 mm (7.4 in)
30 September 1959
Oct
133.4 mm (5.3 in)
19 October 1968
Nov
86.6 mm (3.4 in)
25 November 1964
Dec
105.9 mm (4.2 in)
7 December 1950
Period of Record Coverage
1940 to 1975
Complete yearUnder 90 percent of days
36 years of record at Rocky Knob, 1940 to 1975. 14 years have data for under 90 percent of days and are left out of rankings: 1940, 1948, 1954, 1957, 1958, 1962, 1963, 1964 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 17 complete years at Rocky Knob, 1942 to 1969. Blue stripes are years cooler than the station's own mean of 11.3 C (52.3 F); red stripes are warmer. The coolest year was 1969, at 9.9 C (49.8 F), and the warmest was 1946, at 12.9 C (55.3 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Rocky Knob as warming stripes, 1942 to 1969
Year
Annual mean temperature
Difference from the station mean
1942
11.3 C
-0.02 C
1944
11.9 C
+0.57 C
1945
12.7 C
+1.44 C
1946
12.9 C
+1.64 C
1947
11.0 C
-0.32 C
1949
12.0 C
+0.67 C
1950
10.9 C
-0.36 C
1952
11.7 C
+0.40 C
1956
12.1 C
+0.84 C
1959
11.4 C
+0.14 C
1960
10.4 C
-0.92 C
1961
10.7 C
-0.55 C
1965
11.3 C
-0.03 C
1966
10.6 C
-0.73 C
1967
10.9 C
-0.41 C
1968
10.3 C
-0.95 C
1969
9.9 C
-1.42 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
1940 to 1975
Yearly extremes at Rocky Knob: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
33.9 C (93.0 F)
1952
30.6 C (87.1 F)
36
Coldest night (TNn)
-23.9 C (-11.0 F)
1970
-18.0 C (-0.5 F)
36
Wettest day (Rx1day)
188.2 mm (7.4 in)
1959
80.7 mm (3.2 in)
36
Wettest five days (Rx5day)
331.3 mm (13.0 in)
1940
118.4 mm (4.7 in)
36
Longest dry spell (CDD)
30 days
1953
17 days
36
Hottest day (TXx)
The hottest day of the year at Rocky Knob, 1940 to 1975. The record is 33.9 C (93.0 F) in 1952, marked on the chart; the median year is 30.6 C (87.1 F).
Hottest day (TXx) at Rocky Knob by year
Year
Hottest day (TXx)
1940
32.2 C (90.0 F)
1941
33.3 C (91.9 F)
1942
32.2 C (90.0 F)
1943
30.6 C (87.1 F)
1944
31.7 C (89.1 F)
1945
31.7 C (89.1 F)
1946
29.4 C (84.9 F)
1947
31.7 C (89.1 F)
1948
32.2 C (90.0 F)
1949
30.6 C (87.1 F)
1950
28.3 C (82.9 F)
1951
31.7 C (89.1 F)
1952
33.9 C (93.0 F)
1953
30.6 C (87.1 F)
1954
31.7 C (89.1 F)
1955
30.0 C (86.0 F)
1956
30.6 C (87.1 F)
1957
30.6 C (87.1 F)
1958
29.4 C (84.9 F)
1959
31.1 C (88.0 F)
1960
29.4 C (84.9 F)
1961
28.3 C (82.9 F)
1962
32.2 C (90.0 F)
1963
30.6 C (87.1 F)
1964
28.3 C (82.9 F)
1965
31.1 C (88.0 F)
1966
31.7 C (89.1 F)
1967
29.4 C (84.9 F)
1968
31.1 C (88.0 F)
1969
32.2 C (90.0 F)
1970
30.0 C (86.0 F)
1971
29.4 C (84.9 F)
1972
28.9 C (84.0 F)
1973
31.1 C (88.0 F)
1974
27.2 C (81.0 F)
1975
27.8 C (82.0 F)
Coldest night (TNn)
The coldest night of the year at Rocky Knob, 1940 to 1975. The record is -23.9 C (-11.0 F) in 1970, marked on the chart; the median year is -18.0 C (-0.5 F).
Coldest night (TNn) at Rocky Knob by year
Year
Coldest night (TNn)
1940
-13.9 C (7.0 F)
1941
-16.1 C (3.0 F)
1942
-19.4 C (-2.9 F)
1943
-16.7 C (1.9 F)
1944
-15.6 C (3.9 F)
1945
-16.7 C (1.9 F)
1946
-12.8 C (9.0 F)
1947
-18.3 C (-0.9 F)
1948
-18.3 C (-0.9 F)
1949
-12.8 C (9.0 F)
1950
-17.8 C (0.0 F)
1951
-18.3 C (-0.9 F)
1952
-16.1 C (3.0 F)
1953
-15.0 C (5.0 F)
1954
-16.1 C (3.0 F)
1955
-18.9 C (-2.0 F)
1956
-12.8 C (9.0 F)
1957
-16.1 C (3.0 F)
1958
-21.1 C (-6.0 F)
1959
-19.4 C (-2.9 F)
1960
-18.9 C (-2.0 F)
1961
-18.9 C (-2.0 F)
1962
-21.7 C (-7.1 F)
1963
-23.3 C (-9.9 F)
1964
-16.1 C (3.0 F)
1965
-18.3 C (-0.9 F)
1966
-17.2 C (1.0 F)
1967
-16.7 C (1.9 F)
1968
-18.9 C (-2.0 F)
1969
-18.3 C (-0.9 F)
1970
-23.9 C (-11.0 F)
1971
-19.4 C (-2.9 F)
1972
-20.6 C (-5.1 F)
1973
-19.4 C (-2.9 F)
1974
-13.9 C (7.0 F)
1975
-7.8 C (18.0 F)
Wettest day (Rx1day)
The wettest day of the year at Rocky Knob, 1940 to 1975. The record is 188.2 mm (7.4 in) in 1959, marked on the chart; the median year is 80.7 mm (3.2 in).
Wettest day (Rx1day) at Rocky Knob by year
Year
Wettest day (Rx1day)
1940
171.5 mm (6.8 in)
1941
42.9 mm (1.7 in)
1942
105.4 mm (4.1 in)
1943
81.3 mm (3.2 in)
1944
114.6 mm (4.5 in)
1945
110.5 mm (4.4 in)
1946
94.2 mm (3.7 in)
1947
151.9 mm (6.0 in)
1948
50.0 mm (2.0 in)
1949
62.2 mm (2.4 in)
1950
105.9 mm (4.2 in)
1951
59.7 mm (2.4 in)
1952
82.8 mm (3.3 in)
1953
44.5 mm (1.8 in)
1954
76.2 mm (3.0 in)
1955
80.0 mm (3.1 in)
1956
112.3 mm (4.4 in)
1957
91.2 mm (3.6 in)
1958
74.9 mm (2.9 in)
1959
188.2 mm (7.4 in)
1960
45.7 mm (1.8 in)
1961
53.3 mm (2.1 in)
1962
57.2 mm (2.3 in)
1963
51.6 mm (2.0 in)
1964
172.7 mm (6.8 in)
1965
65.0 mm (2.6 in)
1966
89.2 mm (3.5 in)
1967
71.9 mm (2.8 in)
1968
133.4 mm (5.3 in)
1969
71.1 mm (2.8 in)
1970
106.7 mm (4.2 in)
1971
57.7 mm (2.3 in)
1972
167.4 mm (6.6 in)
1973
95.3 mm (3.8 in)
1974
37.3 mm (1.5 in)
1975
40.1 mm (1.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Rocky Knob, 1940 to 1975. The record is 331.3 mm (13.0 in) in 1940, marked on the chart; the median year is 118.4 mm (4.7 in).
Wettest five days (Rx5day) at Rocky Knob by year
Year
Wettest five days (Rx5day)
1940
331.3 mm (13.0 in)
1941
87.7 mm (3.5 in)
1942
196.6 mm (7.7 in)
1943
135.2 mm (5.3 in)
1944
118.9 mm (4.7 in)
1945
288.7 mm (11.4 in)
1946
121.2 mm (4.8 in)
1947
176.4 mm (6.9 in)
1948
98.7 mm (3.9 in)
1949
191.4 mm (7.5 in)
1950
158.3 mm (6.2 in)
1951
90.7 mm (3.6 in)
1952
112.8 mm (4.4 in)
1953
84.9 mm (3.3 in)
1954
100.3 mm (3.9 in)
1955
105.2 mm (4.1 in)
1956
179.6 mm (7.1 in)
1957
181.4 mm (7.1 in)
1958
117.8 mm (4.6 in)
1959
226.0 mm (8.9 in)
1960
98.8 mm (3.9 in)
1961
79.3 mm (3.1 in)
1962
106.6 mm (4.2 in)
1963
65.0 mm (2.6 in)
1964
202.1 mm (8.0 in)
1965
98.3 mm (3.9 in)
1966
124.8 mm (4.9 in)
1967
141.0 mm (5.6 in)
1968
186.8 mm (7.4 in)
1969
82.2 mm (3.2 in)
1970
126.7 mm (5.0 in)
1971
104.2 mm (4.1 in)
1972
278.2 mm (11.0 in)
1973
109.6 mm (4.3 in)
1974
62.7 mm (2.5 in)
1975
46.4 mm (1.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Rocky Knob, 1940 to 1975. The record is 30 days in 1953, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Rocky Knob by year
Year
Longest dry spell (CDD)
1940
15 days
1941
19 days
1942
23 days
1943
27 days
1944
23 days
1945
22 days
1946
15 days
1947
14 days
1948
18 days
1949
17 days
1950
15 days
1951
14 days
1952
17 days
1953
30 days
1954
13 days
1955
17 days
1956
17 days
1957
12 days
1958
22 days
1959
21 days
1960
12 days
1961
15 days
1962
16 days
1963
23 days
1964
18 days
1965
28 days
1966
19 days
1967
26 days
1968
26 days
1969
22 days
1970
16 days
1971
20 days
1972
12 days
1973
16 days
1974
7 days
1975
14 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.
Download the Data
Data for Rocky Knob standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Rocky Knob 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.