Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Thetford Mines. 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 Thetford Mines, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
12.2 C (54.0 F)
-41.1 C (-42.0 F)
n/a
n/a
Feb
12.2 C (54.0 F)
-38.3 C (-36.9 F)
n/a
n/a
Mar
22.2 C (72.0 F)
-35.6 C (-32.1 F)
n/a
n/a
Apr
28.3 C (82.9 F)
-20.6 C (-5.1 F)
n/a
n/a
May
33.9 C (93.0 F)
-10.0 C (14.0 F)
n/a
n/a
Jun
35.6 C (96.1 F)
-5.6 C (21.9 F)
n/a
n/a
Jul
36.7 C (98.1 F)
-1.1 C (30.0 F)
n/a
n/a
Aug
33.9 C (93.0 F)
-3.3 C (26.1 F)
n/a
n/a
Sep
31.1 C (88.0 F)
-7.2 C (19.0 F)
n/a
n/a
Oct
27.2 C (81.0 F)
-12.8 C (9.0 F)
n/a
n/a
Nov
21.1 C (70.0 F)
-30.6 C (-23.1 F)
n/a
n/a
Dec
16.7 C (62.1 F)
-38.9 C (-38.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Thetford Mines still stand. 1923 holds the most, with 70.
Standing records at Thetford Mines by the year they were set
Year set
Standing records
1922
42
1923
70
1924
29
1925
24
1926
29
1927
33
1928
26
1929
53
1930
36
1931
32
1932
30
1933
50
1934
57
1935
34
1936
66
1937
28
1938
35
1939
35
1940
33
1941
31
1942
30
1943
39
1944
31
1945
39
1946
36
1947
36
1948
30
1949
41
1950
30
1951
31
1952
14
1953
43
1954
34
1955
18
1956
22
1957
37
1958
17
1959
37
1960
16
1961
21
1962
22
1963
28
1964
27
1965
12
Wettest Day of Each Month
Jun: 100.3 mm (3.9 in)
The wettest day on record for each calendar month at Thetford Mines. The most was 100.3 mm (3.9 in) on 14 June 1942.
Record daily precipitation for each month at Thetford Mines
Month
Record daily precipitation (mm)
Date
Jan
61.0 mm (2.4 in)
16 January 1936
Feb
58.4 mm (2.3 in)
14 February 1944
Mar
80.0 mm (3.1 in)
29 March 1960
Apr
48.0 mm (1.9 in)
6 April 1936
May
40.9 mm (1.6 in)
27 May 1933
Jun
100.3 mm (3.9 in)
14 June 1942
Jul
62.5 mm (2.5 in)
29 July 1957
Aug
91.7 mm (3.6 in)
27 August 1950
Sep
90.4 mm (3.6 in)
12 September 1963
Oct
68.6 mm (2.7 in)
24 October 1923
Nov
59.2 mm (2.3 in)
4 November 1950
Dec
43.2 mm (1.7 in)
20 December 1951
Period of Record Coverage
1922 to 1965
Complete yearUnder 90 percent of days
44 years of record at Thetford Mines, 1922 to 1965. 5 years have data for under 90 percent of days and are left out of rankings: 1922, 1925, 1958, 1962, 1965.
Cooler than the station meanWarmer than the station mean
One stripe for each of 37 complete years at Thetford Mines, 1923 to 1964. Blue stripes are years cooler than the station's own mean of 3.5 C (38.4 F); red stripes are warmer. The coolest year was 1923, at 1.8 C (35.2 F), and the warmest was 1953, at 5.1 C (41.2 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at Thetford Mines as warming stripes, 1923 to 1964
Year
Annual mean temperature
Difference from the station mean
1923
1.8 C
-1.76 C
1924
2.2 C
-1.35 C
1927
3.9 C
+0.33 C
1928
3.6 C
+0.03 C
1929
3.4 C
-0.17 C
1930
4.0 C
+0.51 C
1931
4.6 C
+1.03 C
1932
3.1 C
-0.39 C
1933
2.7 C
-0.88 C
1934
1.8 C
-1.70 C
1935
2.0 C
-1.52 C
1936
1.8 C
-1.73 C
1937
3.6 C
+0.05 C
1938
3.6 C
+0.10 C
1939
2.7 C
-0.82 C
1940
2.7 C
-0.85 C
1941
3.9 C
+0.35 C
1942
3.7 C
+0.16 C
1943
2.4 C
-1.15 C
1944
3.6 C
+0.03 C
1945
4.2 C
+0.70 C
1946
3.9 C
+0.35 C
1948
4.1 C
+0.56 C
1949
5.0 C
+1.42 C
1950
3.6 C
+0.04 C
1951
4.1 C
+0.60 C
1952
4.3 C
+0.75 C
1953
5.1 C
+1.57 C
1954
3.3 C
-0.26 C
1955
4.1 C
+0.53 C
1956
3.4 C
-0.13 C
1957
4.4 C
+0.82 C
1959
4.1 C
+0.53 C
1960
4.1 C
+0.60 C
1961
4.4 C
+0.84 C
1963
3.5 C
-0.02 C
1964
4.3 C
+0.78 C
The annual mean temperature here has risen by 0.4 C (0.2 to 0.6) per decade over 1923 to 1964. In Fahrenheit: 0.7 F (0.3 to 1.1) per decade. The slope is a straight line fitted to 37 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Thetford Mines
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.4 C (0.2 to 0.6) per decade
0.7 F (0.3 to 1.1) per decade
1923 to 1964
37
Rise
Mean daily maximum
-0.1 C (-0.3 to 0.2) per decade
-0.1 F (-0.6 to 0.4) per decade
1923 to 1964
37
Not clearly different from zero
Mean daily minimum
0.9 C (0.6 to 1.1) per decade
1.6 F (1.1 to 2.0) per decade
1923 to 1964
37
Rise
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
1922 to 1965
Yearly extremes at Thetford Mines: 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)
1929
31.1 C (88.0 F)
44
Coldest night (TNn)
-41.1 C (-42.0 F)
1925
-33.0 C (-27.5 F)
44
Wettest day (Rx1day)
100.3 mm (3.9 in)
1942
51.1 mm (2.0 in)
44
Wettest five days (Rx5day)
168.2 mm (6.6 in)
1942
85.3 mm (3.4 in)
44
Longest dry spell (CDD)
32 days
1931
14 days
44
Hottest day (TXx)
The hottest day of the year at Thetford Mines, 1922 to 1965. The record is 36.7 C (98.1 F) in 1929, marked on the chart; the median year is 31.1 C (88.0 F).
Hottest day (TXx) at Thetford Mines by year
Year
Hottest day (TXx)
1922
31.1 C (88.0 F)
1923
31.1 C (88.0 F)
1924
29.4 C (84.9 F)
1925
29.4 C (84.9 F)
1926
29.4 C (84.9 F)
1927
29.4 C (84.9 F)
1928
33.3 C (91.9 F)
1929
36.7 C (98.1 F)
1930
33.3 C (91.9 F)
1931
32.8 C (91.0 F)
1932
30.6 C (87.1 F)
1933
33.3 C (91.9 F)
1934
30.6 C (87.1 F)
1935
33.3 C (91.9 F)
1936
30.0 C (86.0 F)
1937
33.3 C (91.9 F)
1938
33.3 C (91.9 F)
1939
30.6 C (87.1 F)
1940
30.0 C (86.0 F)
1941
31.7 C (89.1 F)
1942
30.6 C (87.1 F)
1943
31.1 C (88.0 F)
1944
33.9 C (93.0 F)
1945
30.0 C (86.0 F)
1946
32.8 C (91.0 F)
1947
33.3 C (91.9 F)
1948
31.1 C (88.0 F)
1949
32.2 C (90.0 F)
1950
29.4 C (84.9 F)
1951
30.0 C (86.0 F)
1952
35.0 C (95.0 F)
1953
33.9 C (93.0 F)
1954
27.8 C (82.0 F)
1955
33.9 C (93.0 F)
1956
31.1 C (88.0 F)
1957
30.6 C (87.1 F)
1958
28.3 C (82.9 F)
1959
32.8 C (91.0 F)
1960
30.6 C (87.1 F)
1961
30.0 C (86.0 F)
1962
30.6 C (87.1 F)
1963
31.7 C (89.1 F)
1964
31.7 C (89.1 F)
1965
30.6 C (87.1 F)
Coldest night (TNn)
The coldest night of the year at Thetford Mines, 1922 to 1965. The record is -41.1 C (-42.0 F) in 1925, marked on the chart; the median year is -33.0 C (-27.5 F).
Coldest night (TNn) at Thetford Mines by year
Year
Coldest night (TNn)
1922
-37.2 C (-35.0 F)
1923
-38.3 C (-36.9 F)
1924
-37.8 C (-36.0 F)
1925
-41.1 C (-42.0 F)
1926
-32.8 C (-27.0 F)
1927
-33.3 C (-27.9 F)
1928
-31.7 C (-25.1 F)
1929
-33.9 C (-29.0 F)
1930
-35.0 C (-31.0 F)
1931
-31.7 C (-25.1 F)
1932
-35.6 C (-32.1 F)
1933
-38.9 C (-38.0 F)
1934
-38.3 C (-36.9 F)
1935
-36.7 C (-34.1 F)
1936
-35.0 C (-31.0 F)
1937
-29.4 C (-20.9 F)
1938
-35.6 C (-32.1 F)
1939
-33.9 C (-29.0 F)
1940
-31.7 C (-25.1 F)
1941
-31.7 C (-25.1 F)
1942
-32.8 C (-27.0 F)
1943
-37.8 C (-36.0 F)
1944
-33.3 C (-27.9 F)
1945
-31.7 C (-25.1 F)
1946
-31.1 C (-24.0 F)
1947
-27.8 C (-18.0 F)
1948
-31.7 C (-25.1 F)
1949
-26.7 C (-16.1 F)
1950
-29.4 C (-20.9 F)
1951
-35.0 C (-31.0 F)
1952
-31.1 C (-24.0 F)
1953
-27.2 C (-17.0 F)
1954
-32.2 C (-26.0 F)
1955
-34.4 C (-29.9 F)
1956
-27.8 C (-18.0 F)
1957
-35.6 C (-32.1 F)
1958
-30.6 C (-23.1 F)
1959
-30.6 C (-23.1 F)
1960
-34.4 C (-29.9 F)
1961
-29.4 C (-20.9 F)
1962
-36.7 C (-34.1 F)
1963
-31.7 C (-25.1 F)
1964
-31.7 C (-25.1 F)
1965
-33.3 C (-27.9 F)
Wettest day (Rx1day)
The wettest day of the year at Thetford Mines, 1922 to 1965. The record is 100.3 mm (3.9 in) in 1942, marked on the chart; the median year is 51.1 mm (2.0 in).
Wettest day (Rx1day) at Thetford Mines by year
Year
Wettest day (Rx1day)
1922
63.5 mm (2.5 in)
1923
68.6 mm (2.7 in)
1924
56.1 mm (2.2 in)
1925
45.2 mm (1.8 in)
1926
58.4 mm (2.3 in)
1927
30.5 mm (1.2 in)
1928
38.1 mm (1.5 in)
1929
36.8 mm (1.4 in)
1930
39.6 mm (1.6 in)
1931
38.6 mm (1.5 in)
1932
65.0 mm (2.6 in)
1933
43.4 mm (1.7 in)
1934
38.4 mm (1.5 in)
1935
47.0 mm (1.9 in)
1936
61.0 mm (2.4 in)
1937
51.1 mm (2.0 in)
1938
38.1 mm (1.5 in)
1939
79.5 mm (3.1 in)
1940
44.2 mm (1.7 in)
1941
43.2 mm (1.7 in)
1942
100.3 mm (3.9 in)
1943
37.3 mm (1.5 in)
1944
58.4 mm (2.3 in)
1945
51.1 mm (2.0 in)
1946
64.3 mm (2.5 in)
1947
40.6 mm (1.6 in)
1948
39.9 mm (1.6 in)
1949
49.0 mm (1.9 in)
1950
91.7 mm (3.6 in)
1951
62.2 mm (2.4 in)
1952
85.1 mm (3.4 in)
1953
60.2 mm (2.4 in)
1954
57.7 mm (2.3 in)
1955
57.2 mm (2.3 in)
1956
51.1 mm (2.0 in)
1957
62.5 mm (2.5 in)
1958
35.6 mm (1.4 in)
1959
61.0 mm (2.4 in)
1960
86.1 mm (3.4 in)
1961
63.5 mm (2.5 in)
1962
40.6 mm (1.6 in)
1963
90.4 mm (3.6 in)
1964
36.1 mm (1.4 in)
1965
34.0 mm (1.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Thetford Mines, 1922 to 1965. The record is 168.2 mm (6.6 in) in 1942, marked on the chart; the median year is 85.3 mm (3.4 in).
Wettest five days (Rx5day) at Thetford Mines by year
Year
Wettest five days (Rx5day)
1922
118.1 mm (4.6 in)
1923
103.4 mm (4.1 in)
1924
97.7 mm (3.8 in)
1925
48.5 mm (1.9 in)
1926
59.4 mm (2.3 in)
1927
44.5 mm (1.8 in)
1928
76.2 mm (3.0 in)
1929
64.5 mm (2.5 in)
1930
65.8 mm (2.6 in)
1931
46.7 mm (1.8 in)
1932
95.7 mm (3.8 in)
1933
86.6 mm (3.4 in)
1934
88.5 mm (3.5 in)
1935
77.4 mm (3.0 in)
1936
75.0 mm (3.0 in)
1937
105.4 mm (4.1 in)
1938
56.7 mm (2.2 in)
1939
98.6 mm (3.9 in)
1940
70.3 mm (2.8 in)
1941
73.9 mm (2.9 in)
1942
168.2 mm (6.6 in)
1943
73.8 mm (2.9 in)
1944
89.4 mm (3.5 in)
1945
89.0 mm (3.5 in)
1946
125.6 mm (4.9 in)
1947
75.5 mm (3.0 in)
1948
52.6 mm (2.1 in)
1949
58.5 mm (2.3 in)
1950
145.8 mm (5.7 in)
1951
88.1 mm (3.5 in)
1952
103.6 mm (4.1 in)
1953
86.9 mm (3.4 in)
1954
123.9 mm (4.9 in)
1955
83.9 mm (3.3 in)
1956
89.5 mm (3.5 in)
1957
66.1 mm (2.6 in)
1958
55.9 mm (2.2 in)
1959
117.1 mm (4.6 in)
1960
102.9 mm (4.1 in)
1961
112.5 mm (4.4 in)
1962
77.5 mm (3.1 in)
1963
95.7 mm (3.8 in)
1964
56.2 mm (2.2 in)
1965
80.4 mm (3.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Thetford Mines, 1922 to 1965. The record is 32 days in 1931, marked on the chart; the median year is 14 days.
Longest dry spell (CDD) at Thetford Mines by year
Year
Longest dry spell (CDD)
1922
12 days
1923
12 days
1924
14 days
1925
16 days
1926
14 days
1927
31 days
1928
14 days
1929
15 days
1930
17 days
1931
32 days
1932
16 days
1933
12 days
1934
17 days
1935
13 days
1936
13 days
1937
12 days
1938
14 days
1939
21 days
1940
12 days
1941
13 days
1942
13 days
1943
10 days
1944
16 days
1945
11 days
1946
10 days
1947
18 days
1948
16 days
1949
14 days
1950
17 days
1951
14 days
1952
13 days
1953
17 days
1954
10 days
1955
17 days
1956
17 days
1957
15 days
1958
9 days
1959
18 days
1960
9 days
1961
10 days
1962
16 days
1963
17 days
1964
13 days
1965
8 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
37 years with a frost
Across 37 years with a frost, the median last spring frost at Thetford Mines falls on 2 June and the median first autumn frost on 11 September, which leaves a median of 103 days between them.
Fitted over all years, the growing season changes by +13.2 days per decade at this station.
Frost dates and growing season at Thetford Mines
Measure
Median, all years
Earliest period
Recent period (1932 to 1964)
Recent against earliest
Fitted trend
Last spring frost
2 June
n/a
1 June
n/a
-5.5 days per decade
First autumn frost
11 September
n/a
13 September
n/a
+7.7 days per decade
Growing days
103 days
n/a
105 days
n/a
+13.2 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
36 years, 1923 to 1964
A day with at least 53.8 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 117.2 mm (4.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Thetford Mines: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
53.8 mm (2.1 in)
5 years
69.7 mm (2.7 in)
10 years
80.7 mm (3.2 in)
25 years
95.0 mm (3.7 in)
50 years
106.0 mm (4.2 in)
Longer than the 36 years of record
100 years
117.2 mm (4.6 in)
Longer than the 36 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, 36 years of values from 1923 to 1964.
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: 100.3 mm (3.9 in) in 1942; 91.7 mm (3.6 in) in 1950; 90.4 mm (3.6 in) in 1963.
Download the Data
Data for Thetford Mines standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Thetford Mines 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.