Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Cornwall. 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 Cornwall, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
15.6 C (60.1 F)
-43.3 C (-45.9 F)
n/a
n/a
Feb
15.6 C (60.1 F)
-35.6 C (-32.1 F)
n/a
n/a
Mar
25.6 C (78.1 F)
-24.5 C (-12.1 F)
n/a
n/a
Apr
28.9 C (84.0 F)
-15.0 C (5.0 F)
n/a
n/a
May
32.2 C (90.0 F)
-5.6 C (21.9 F)
n/a
n/a
Jun
35.0 C (95.0 F)
0.6 C (33.1 F)
n/a
n/a
Jul
35.6 C (96.1 F)
3.3 C (37.9 F)
n/a
n/a
Aug
35.6 C (96.1 F)
1.7 C (35.1 F)
n/a
n/a
Sep
34.4 C (93.9 F)
-6.1 C (21.0 F)
n/a
n/a
Oct
27.8 C (82.0 F)
-8.3 C (17.1 F)
n/a
n/a
Nov
23.9 C (75.0 F)
-20.0 C (-4.0 F)
n/a
n/a
Dec
18.0 C (64.4 F)
-33.3 C (-27.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Cornwall still stand. 1955 holds the most, with 71.
Standing records at Cornwall by the year they were set
Year set
Standing records
1950
4
1951
54
1952
39
1953
58
1954
33
1955
71
1956
65
1957
66
1958
33
1959
65
1960
17
1961
29
1962
44
1963
43
1964
39
1965
45
1966
50
1967
48
1968
42
1969
24
1970
38
1971
33
1972
41
1973
44
1974
36
1975
41
1976
61
1977
37
1978
33
1979
62
1980
36
1981
50
1982
43
1983
40
Wettest Day of Each Month
Sep: 110.4 mm (4.3 in)
The wettest day on record for each calendar month at Cornwall. The most was 110.4 mm (4.3 in) on 14 September 1979.
Record daily precipitation for each month at Cornwall
Month
Record daily precipitation (mm)
Date
Jan
53.3 mm (2.1 in)
30 January 1966
Feb
37.6 mm (1.5 in)
25 February 1961
Mar
42.4 mm (1.7 in)
17 March 1973
Apr
35.6 mm (1.4 in)
3 April 1975
May
39.6 mm (1.6 in)
31 May 1960
Jun
58.9 mm (2.3 in)
23 June 1969
Jul
73.0 mm (2.9 in)
17 July 1977
Aug
70.9 mm (2.8 in)
20 August 1962
Sep
110.4 mm (4.3 in)
14 September 1979
Oct
57.2 mm (2.3 in)
27 October 1981
Nov
43.2 mm (1.7 in)
2 November 1967
Dec
35.0 mm (1.4 in)
15 December 1982
Period of Record Coverage
1950 to 1983
Complete yearUnder 90 percent of days
34 years of record at Cornwall, 1950 to 1983. 4 years have data for under 90 percent of days and are left out of rankings: 1950, 1954, 1958, 1964.
Cooler than the station meanWarmer than the station mean
One stripe for each of 28 complete years at Cornwall, 1951 to 1983. Blue stripes are years cooler than the station's own mean of 6.6 C (43.9 F); red stripes are warmer. The coolest year was 1956, at 5.4 C (41.7 F), and the warmest was 1973, at 7.6 C (45.7 F). The strongest colour marks a difference of 1.3 C (2.3 F).
Annual mean temperature at Cornwall as warming stripes, 1951 to 1983
Year
Annual mean temperature
Difference from the station mean
1951
6.7 C
+0.08 C
1952
7.4 C
+0.76 C
1955
6.6 C
+0.01 C
1956
5.4 C
-1.24 C
1957
6.3 C
-0.34 C
1959
7.0 C
+0.35 C
1960
7.0 C
+0.34 C
1961
6.9 C
+0.33 C
1962
6.1 C
-0.52 C
1963
6.1 C
-0.49 C
1965
6.5 C
-0.15 C
1966
6.7 C
+0.10 C
1967
6.4 C
-0.23 C
1968
6.3 C
-0.36 C
1969
6.7 C
+0.04 C
1970
6.3 C
-0.33 C
1972
5.6 C
-1.01 C
1973
7.6 C
+1.01 C
1974
6.3 C
-0.27 C
1975
7.6 C
+0.94 C
1976
5.9 C
-0.69 C
1977
6.9 C
+0.32 C
1978
6.0 C
-0.58 C
1979
7.3 C
+0.69 C
1980
6.2 C
-0.44 C
1981
7.5 C
+0.86 C
1982
6.7 C
+0.13 C
1983
7.4 C
+0.80 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
1950 to 1983
Yearly extremes at Cornwall: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
35.6 C (96.1 F)
1955
32.2 C (90.0 F)
34
Coldest night (TNn)
-43.3 C (-45.9 F)
1957
-29.4 C (-20.9 F)
34
Wettest day (Rx1day)
110.4 mm (4.3 in)
1979
40.9 mm (1.6 in)
34
Wettest five days (Rx5day)
138.0 mm (5.4 in)
1979
63.7 mm (2.5 in)
33
Longest dry spell (CDD)
23 days
1957
15 days
33
Hottest day (TXx)
The hottest day of the year at Cornwall, 1950 to 1983. The record is 35.6 C (96.1 F) in 1955, marked on the chart; the median year is 32.2 C (90.0 F).
Hottest day (TXx) at Cornwall by year
Year
Hottest day (TXx)
1950
20.0 C (68.0 F)
1951
31.1 C (88.0 F)
1952
32.8 C (91.0 F)
1953
34.4 C (93.9 F)
1954
29.4 C (84.9 F)
1955
35.6 C (96.1 F)
1956
31.7 C (89.1 F)
1957
32.2 C (90.0 F)
1958
31.7 C (89.1 F)
1959
33.3 C (91.9 F)
1960
32.2 C (90.0 F)
1961
31.1 C (88.0 F)
1962
32.8 C (91.0 F)
1963
35.0 C (95.0 F)
1964
35.0 C (95.0 F)
1965
32.2 C (90.0 F)
1966
33.9 C (93.0 F)
1967
31.7 C (89.1 F)
1968
32.2 C (90.0 F)
1969
32.2 C (90.0 F)
1970
31.7 C (89.1 F)
1971
32.2 C (90.0 F)
1972
31.7 C (89.1 F)
1973
32.8 C (91.0 F)
1974
30.6 C (87.1 F)
1975
35.6 C (96.1 F)
1976
31.1 C (88.0 F)
1977
33.0 C (91.4 F)
1978
33.0 C (91.4 F)
1979
33.0 C (91.4 F)
1980
31.0 C (87.8 F)
1981
33.0 C (91.4 F)
1982
32.5 C (90.5 F)
1983
33.0 C (91.4 F)
Coldest night (TNn)
The coldest night of the year at Cornwall, 1950 to 1983. The record is -43.3 C (-45.9 F) in 1957, marked on the chart; the median year is -29.4 C (-20.9 F).
Coldest night (TNn) at Cornwall by year
Year
Coldest night (TNn)
1950
-26.1 C (-15.0 F)
1951
-35.6 C (-32.1 F)
1952
-29.4 C (-20.9 F)
1953
-25.6 C (-14.1 F)
1954
-33.9 C (-29.0 F)
1955
-33.3 C (-27.9 F)
1956
-31.1 C (-24.0 F)
1957
-43.3 C (-45.9 F)
1958
-30.0 C (-22.0 F)
1959
-32.2 C (-26.0 F)
1960
-26.1 C (-15.0 F)
1961
-26.7 C (-16.1 F)
1962
-31.1 C (-24.0 F)
1963
-28.3 C (-18.9 F)
1964
-24.4 C (-11.9 F)
1965
-29.4 C (-20.9 F)
1966
-30.0 C (-22.0 F)
1967
-29.4 C (-20.9 F)
1968
-31.1 C (-24.0 F)
1969
-23.9 C (-11.0 F)
1970
-27.2 C (-17.0 F)
1971
-30.6 C (-23.1 F)
1972
-29.4 C (-20.9 F)
1973
-29.4 C (-20.9 F)
1974
-28.9 C (-20.0 F)
1975
-28.9 C (-20.0 F)
1976
-31.7 C (-25.1 F)
1977
-27.2 C (-17.0 F)
1978
-26.0 C (-14.8 F)
1979
-29.0 C (-20.2 F)
1980
-30.0 C (-22.0 F)
1981
-35.0 C (-31.0 F)
1982
-28.0 C (-18.4 F)
1983
-26.0 C (-14.8 F)
Wettest day (Rx1day)
The wettest day of the year at Cornwall, 1950 to 1983. The record is 110.4 mm (4.3 in) in 1979, marked on the chart; the median year is 40.9 mm (1.6 in).
Wettest day (Rx1day) at Cornwall by year
Year
Wettest day (Rx1day)
1950
33.5 mm (1.3 in)
1951
51.1 mm (2.0 in)
1952
52.1 mm (2.1 in)
1953
50.8 mm (2.0 in)
1954
32.0 mm (1.3 in)
1955
53.3 mm (2.1 in)
1956
27.7 mm (1.1 in)
1957
29.2 mm (1.1 in)
1958
30.5 mm (1.2 in)
1959
25.9 mm (1.0 in)
1960
39.6 mm (1.6 in)
1961
37.6 mm (1.5 in)
1962
70.9 mm (2.8 in)
1963
42.4 mm (1.7 in)
1964
21.6 mm (0.9 in)
1965
42.2 mm (1.7 in)
1966
53.3 mm (2.1 in)
1967
43.2 mm (1.7 in)
1968
31.5 mm (1.2 in)
1969
58.9 mm (2.3 in)
1970
30.5 mm (1.2 in)
1971
38.1 mm (1.5 in)
1972
38.6 mm (1.5 in)
1973
81.0 mm (3.2 in)
1974
39.4 mm (1.6 in)
1975
53.3 mm (2.1 in)
1976
44.5 mm (1.8 in)
1977
73.0 mm (2.9 in)
1978
37.5 mm (1.5 in)
1979
110.4 mm (4.3 in)
1980
36.8 mm (1.4 in)
1981
57.2 mm (2.3 in)
1982
70.0 mm (2.8 in)
1983
36.0 mm (1.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Cornwall, 1950 to 1983. The record is 138.0 mm (5.4 in) in 1979, marked on the chart; the median year is 63.7 mm (2.5 in).
Wettest five days (Rx5day) at Cornwall by year
Year
Wettest five days (Rx5day)
1950
n/a
1951
65.8 mm (2.6 in)
1952
63.7 mm (2.5 in)
1953
55.1 mm (2.2 in)
1954
63.9 mm (2.5 in)
1955
91.7 mm (3.6 in)
1956
81.0 mm (3.2 in)
1957
53.3 mm (2.1 in)
1958
66.8 mm (2.6 in)
1959
42.0 mm (1.7 in)
1960
45.3 mm (1.8 in)
1961
62.4 mm (2.5 in)
1962
82.6 mm (3.3 in)
1963
54.1 mm (2.1 in)
1964
31.5 mm (1.2 in)
1965
79.8 mm (3.1 in)
1966
83.1 mm (3.3 in)
1967
51.1 mm (2.0 in)
1968
48.0 mm (1.9 in)
1969
105.6 mm (4.2 in)
1970
63.3 mm (2.5 in)
1971
65.0 mm (2.6 in)
1972
63.5 mm (2.5 in)
1973
111.5 mm (4.4 in)
1974
53.9 mm (2.1 in)
1975
84.5 mm (3.3 in)
1976
51.7 mm (2.0 in)
1977
91.8 mm (3.6 in)
1978
63.7 mm (2.5 in)
1979
138.0 mm (5.4 in)
1980
58.2 mm (2.3 in)
1981
88.6 mm (3.5 in)
1982
82.6 mm (3.3 in)
1983
59.1 mm (2.3 in)
Longest dry spell (CDD)
The longest dry spell of the year at Cornwall, 1950 to 1983. The record is 23 days in 1957, marked on the chart; the median year is 15 days.
Longest dry spell (CDD) at Cornwall by year
Year
Longest dry spell (CDD)
1950
n/a
1951
14 days
1952
14 days
1953
19 days
1954
13 days
1955
15 days
1956
18 days
1957
23 days
1958
14 days
1959
20 days
1960
19 days
1961
21 days
1962
13 days
1963
19 days
1964
12 days
1965
19 days
1966
12 days
1967
17 days
1968
12 days
1969
14 days
1970
18 days
1971
12 days
1972
13 days
1973
16 days
1974
13 days
1975
18 days
1976
16 days
1977
15 days
1978
19 days
1979
12 days
1980
20 days
1981
10 days
1982
14 days
1983
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 Cornwall falls on 7 May and the median first autumn frost on 7 October, which leaves a median of 157 days between them.
Fitted over all years, the growing season changes by +10.5 days per decade at this station.
Frost dates and growing season at Cornwall
Measure
Median, all years
Earliest period
Recent period (1951 to 1983)
Recent against earliest
Fitted trend
Last spring frost
7 May
n/a
7 May
n/a
-6.0 days per decade
First autumn frost
7 October
n/a
7 October
n/a
+4.5 days per decade
Growing days
157 days
n/a
157 days
n/a
+10.5 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.
Download the Data
Data for Cornwall standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Cornwall 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.