Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Lethbridge Cda. 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 Lethbridge Cda, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
17.8 C (64.0 F)
-42.8 C (-45.0 F)
n/a
n/a
Feb
20.0 C (68.0 F)
-41.1 C (-42.0 F)
n/a
n/a
Mar
24.4 C (75.9 F)
-37.8 C (-36.0 F)
n/a
n/a
Apr
31.1 C (88.0 F)
-27.2 C (-17.0 F)
n/a
n/a
May
33.3 C (91.9 F)
-12.8 C (9.0 F)
n/a
n/a
Jun
35.6 C (96.1 F)
-3.3 C (26.1 F)
n/a
n/a
Jul
37.8 C (100.0 F)
0.0 C (32.0 F)
n/a
n/a
Aug
36.1 C (97.0 F)
-1.7 C (28.9 F)
n/a
n/a
Sep
36.1 C (97.0 F)
-15.6 C (3.9 F)
n/a
n/a
Oct
30.0 C (86.0 F)
-26.1 C (-15.0 F)
n/a
n/a
Nov
23.3 C (73.9 F)
-35.6 C (-32.1 F)
n/a
n/a
Dec
19.4 C (66.9 F)
-42.8 C (-45.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Lethbridge Cda still stand. 1936 holds the most, with 49.
Standing records at Lethbridge Cda by the year they were set
Year set
Standing records
1908
27
1909
30
1910
39
1911
28
1912
19
1913
19
1914
15
1915
9
1916
36
1917
29
1918
24
1919
42
1920
14
1921
20
1922
16
1923
18
1924
23
1925
25
1926
25
1927
16
1928
29
1929
20
1930
14
1931
17
1932
16
1933
21
1934
27
1935
21
1936
49
1937
15
1938
7
1939
29
1940
13
1941
15
1942
22
1943
29
1944
8
1945
9
1946
21
1947
8
1948
7
1949
21
1950
25
1951
39
1952
12
1953
10
1954
31
1955
15
1956
18
1957
13
1958
9
1959
10
1960
13
1961
12
1962
17
1963
15
1964
16
1965
16
1966
16
1967
29
1968
26
1969
17
1970
13
1971
13
1972
20
1973
18
1974
10
1975
14
1976
9
1977
17
1978
13
1979
14
1980
26
1981
25
1982
6
1983
15
All-Time Record Progression
9 new records
9 all-time records were set at Lethbridge Cda between 28 March 1938 and 25 March 1972. Each dot is a new record.
When Lethbridge Cda set new all-time records
Date
Kind
Detail
1938-03-28
Record daily snowfall
Record daily snowfall 26.4 cm (10.4 in)
1938-11-10
Record daily snowfall
Record daily snowfall 30.5 cm (12.0 in)
1944-11-01
Record daily snowfall
Record daily snowfall 35.6 cm (14.0 in)
1960-07-19
Record high maximum temperature
Record high maximum temperature 37.8 C (100.0 F)
1960-07-31
Record high minimum temperature
Record high minimum temperature 20.0 C (68.0 F)
1963-06-21
Record daily precipitation
Record daily precipitation 92.7 mm (3.6 in)
1967-04-19
Record daily snowfall
Record daily snowfall 38.1 cm (15.0 in)
1968-09-21
Record daily snowfall
Record daily snowfall 40.4 cm (15.9 in)
1972-03-25
Record daily snowfall
Record daily snowfall 40.6 cm (16.0 in)
Wettest Day of Each Month
Jun: 92.7 mm (3.6 in)
The wettest day on record for each calendar month at Lethbridge Cda. The most was 92.7 mm (3.6 in) on 21 June 1963.
Record daily precipitation for each month at Lethbridge Cda
Month
Record daily precipitation (mm)
Date
Jan
18.0 mm (0.7 in)
24 January 1959
Feb
24.4 mm (1.0 in)
22 February 1953
Mar
35.6 mm (1.4 in)
25 March 1972
Apr
54.4 mm (2.1 in)
26 April 1974
May
57.4 mm (2.3 in)
23 May 1980
Jun
92.7 mm (3.6 in)
21 June 1963
Jul
55.9 mm (2.2 in)
18 July 1916
Aug
91.6 mm (3.6 in)
23 August 1979
Sep
75.7 mm (3.0 in)
4 September 1916
Oct
72.4 mm (2.9 in)
2 October 1910
Nov
35.6 mm (1.4 in)
1 November 1944
Dec
22.9 mm (0.9 in)
11 December 1933
Period of Record Coverage
1908 to 1983
Complete yearUnder 90 percent of days
76 years of record at Lethbridge Cda, 1908 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1908.
Cooler than the station meanWarmer than the station mean
One stripe for each of 75 complete years at Lethbridge Cda, 1909 to 1983. Blue stripes are years cooler than the station's own mean of 5.0 C (40.9 F); red stripes are warmer. The coolest year was 1951, at 2.6 C (36.7 F), and the warmest was 1931, at 7.4 C (45.3 F). The strongest colour marks a difference of 2.5 C (4.5 F).
Annual mean temperature at Lethbridge Cda as warming stripes, 1909 to 1983
Year
Annual mean temperature
Difference from the station mean
1909
3.6 C
-1.35 C
1910
6.3 C
+1.29 C
1911
4.1 C
-0.83 C
1912
4.9 C
-0.04 C
1913
4.2 C
-0.75 C
1914
4.4 C
-0.58 C
1915
5.2 C
+0.20 C
1916
3.0 C
-1.95 C
1917
3.9 C
-1.05 C
1918
5.7 C
+0.74 C
1919
4.2 C
-0.79 C
1920
4.3 C
-0.72 C
1921
5.0 C
+0.01 C
1922
4.3 C
-0.72 C
1923
5.9 C
+0.94 C
1924
4.6 C
-0.35 C
1925
5.1 C
+0.13 C
1926
5.8 C
+0.79 C
1927
3.3 C
-1.66 C
1928
5.5 C
+0.57 C
1929
3.8 C
-1.18 C
1930
6.1 C
+1.10 C
1931
7.4 C
+2.42 C
1932
4.9 C
-0.08 C
1933
4.8 C
-0.18 C
1934
7.1 C
+2.11 C
1935
4.8 C
-0.19 C
1936
4.5 C
-0.50 C
1937
4.1 C
-0.89 C
1938
5.9 C
+0.88 C
1939
6.3 C
+1.36 C
1940
5.6 C
+0.64 C
1941
6.3 C
+1.37 C
1942
5.2 C
+0.27 C
1943
5.0 C
+0.07 C
1944
6.0 C
+0.98 C
1945
4.4 C
-0.60 C
1946
5.8 C
+0.85 C
1947
5.0 C
+0.03 C
1948
4.4 C
-0.53 C
1949
4.1 C
-0.86 C
1950
3.2 C
-1.81 C
1951
2.6 C
-2.38 C
1952
5.5 C
+0.50 C
1953
6.2 C
+1.20 C
1954
4.8 C
-0.13 C
1955
3.0 C
-1.94 C
1956
4.7 C
-0.27 C
1957
4.9 C
-0.03 C
1958
6.0 C
+1.03 C
1959
4.6 C
-0.41 C
1960
5.5 C
+0.48 C
1961
6.0 C
+1.05 C
1962
5.5 C
+0.55 C
1963
6.1 C
+1.11 C
1964
4.8 C
-0.20 C
1965
4.0 C
-0.93 C
1966
4.4 C
-0.54 C
1967
5.1 C
+0.08 C
1968
4.8 C
-0.20 C
1969
4.0 C
-0.99 C
1970
4.9 C
-0.12 C
1971
4.6 C
-0.35 C
1972
3.6 C
-1.38 C
1973
5.5 C
+0.56 C
1974
6.1 C
+1.13 C
1975
4.0 C
-1.01 C
1976
6.6 C
+1.63 C
1977
5.7 C
+0.74 C
1978
3.8 C
-1.14 C
1979
5.0 C
+0.07 C
1980
5.8 C
+0.87 C
1981
7.2 C
+2.19 C
1982
3.8 C
-1.20 C
1983
5.9 C
+0.90 C
The fitted trend in annual mean temperature here over 1909 to 1983 is 0.1 C (-0.1 to 0.2) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.3) per decade. The slope is a straight line fitted to 75 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Lethbridge Cda
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.1 C (-0.1 to 0.2) per decade
0.1 F (-0.1 to 0.3) per decade
1909 to 1983
75
Not clearly different from zero
Mean daily maximum
-0.01 C (-0.13 to 0.11) per decade
-0.02 F (-0.24 to 0.20) per decade
1909 to 1983
75
Not clearly different from zero
Mean daily minimum
0.12 C (0.01 to 0.22) per decade
0.21 F (0.02 to 0.40) per decade
1909 to 1983
75
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
1908 to 1983
Yearly extremes at Lethbridge Cda: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
37.8 C (100.0 F)
1960
33.9 C (93.0 F)
76
Coldest night (TNn)
-42.8 C (-45.0 F)
1909
-35.8 C (-32.5 F)
76
Wettest day (Rx1day)
92.7 mm (3.6 in)
1963
35.1 mm (1.4 in)
76
Wettest five days (Rx5day)
128.3 mm (5.1 in)
1908
58.4 mm (2.3 in)
76
Longest dry spell (CDD)
66 days
1969
32 days
76
Hottest day (TXx)
The hottest day of the year at Lethbridge Cda, 1908 to 1983. The record is 37.8 C (100.0 F) in 1960, marked on the chart; the median year is 33.9 C (93.0 F).
Hottest day (TXx) at Lethbridge Cda by year
Year
Hottest day (TXx)
1908
35.0 C (95.0 F)
1909
32.8 C (91.0 F)
1910
37.2 C (99.0 F)
1911
33.9 C (93.0 F)
1912
35.0 C (95.0 F)
1913
33.9 C (93.0 F)
1914
36.1 C (97.0 F)
1915
33.9 C (93.0 F)
1916
31.7 C (89.1 F)
1917
33.9 C (93.0 F)
1918
34.4 C (93.9 F)
1919
36.7 C (98.1 F)
1920
33.9 C (93.0 F)
1921
35.6 C (96.1 F)
1922
33.3 C (91.9 F)
1923
31.7 C (89.1 F)
1924
33.9 C (93.0 F)
1925
33.3 C (91.9 F)
1926
33.9 C (93.0 F)
1927
30.0 C (86.0 F)
1928
33.3 C (91.9 F)
1929
36.1 C (97.0 F)
1930
34.4 C (93.9 F)
1931
35.0 C (95.0 F)
1932
33.9 C (93.0 F)
1933
36.7 C (98.1 F)
1934
35.0 C (95.0 F)
1935
35.0 C (95.0 F)
1936
36.7 C (98.1 F)
1937
33.9 C (93.0 F)
1938
33.9 C (93.0 F)
1939
36.1 C (97.0 F)
1940
33.9 C (93.0 F)
1941
35.0 C (95.0 F)
1942
32.2 C (90.0 F)
1943
32.2 C (90.0 F)
1944
34.4 C (93.9 F)
1945
34.4 C (93.9 F)
1946
35.0 C (95.0 F)
1947
34.4 C (93.9 F)
1948
33.3 C (91.9 F)
1949
35.0 C (95.0 F)
1950
36.1 C (97.0 F)
1951
33.3 C (91.9 F)
1952
32.2 C (90.0 F)
1953
35.6 C (96.1 F)
1954
33.9 C (93.0 F)
1955
33.3 C (91.9 F)
1956
32.8 C (91.0 F)
1957
32.8 C (91.0 F)
1958
32.8 C (91.0 F)
1959
33.9 C (93.0 F)
1960
37.8 C (100.0 F)
1961
36.1 C (97.0 F)
1962
33.9 C (93.0 F)
1963
32.2 C (90.0 F)
1964
33.9 C (93.0 F)
1965
32.8 C (91.0 F)
1966
31.7 C (89.1 F)
1967
35.6 C (96.1 F)
1968
35.6 C (96.1 F)
1969
35.6 C (96.1 F)
1970
35.0 C (95.0 F)
1971
36.1 C (97.0 F)
1972
34.4 C (93.9 F)
1973
37.8 C (100.0 F)
1974
35.0 C (95.0 F)
1975
35.6 C (96.1 F)
1976
32.8 C (91.0 F)
1977
32.2 C (90.0 F)
1978
32.5 C (90.5 F)
1979
35.0 C (95.0 F)
1980
33.0 C (91.4 F)
1981
35.0 C (95.0 F)
1982
32.5 C (90.5 F)
1983
35.5 C (95.9 F)
Coldest night (TNn)
The coldest night of the year at Lethbridge Cda, 1908 to 1983. The record is -42.8 C (-45.0 F) in 1909, marked on the chart; the median year is -35.8 C (-32.5 F).
Coldest night (TNn) at Lethbridge Cda by year
Year
Coldest night (TNn)
1908
-33.9 C (-29.0 F)
1909
-42.8 C (-45.0 F)
1910
-37.8 C (-36.0 F)
1911
-39.4 C (-38.9 F)
1912
-35.0 C (-31.0 F)
1913
-34.4 C (-29.9 F)
1914
-40.0 C (-40.0 F)
1915
-32.8 C (-27.0 F)
1916
-41.1 C (-42.0 F)
1917
-41.1 C (-42.0 F)
1918
-40.6 C (-41.1 F)
1919
-38.9 C (-38.0 F)
1920
-40.0 C (-40.0 F)
1921
-35.6 C (-32.1 F)
1922
-37.2 C (-35.0 F)
1923
-38.3 C (-36.9 F)
1924
-42.8 C (-45.0 F)
1925
-33.3 C (-27.9 F)
1926
-29.4 C (-20.9 F)
1927
-38.9 C (-38.0 F)
1928
-36.1 C (-33.0 F)
1929
-42.8 C (-45.0 F)
1930
-38.9 C (-38.0 F)
1931
-25.0 C (-13.0 F)
1932
-33.3 C (-27.9 F)
1933
-32.2 C (-26.0 F)
1934
-31.1 C (-24.0 F)
1935
-35.6 C (-32.1 F)
1936
-40.6 C (-41.1 F)
1937
-37.2 C (-35.0 F)
1938
-35.6 C (-32.1 F)
1939
-40.0 C (-40.0 F)
1940
-31.7 C (-25.1 F)
1941
-28.9 C (-20.0 F)
1942
-33.3 C (-27.9 F)
1943
-42.8 C (-45.0 F)
1944
-27.8 C (-18.0 F)
1945
-30.0 C (-22.0 F)
1946
-32.2 C (-26.0 F)
1947
-37.8 C (-36.0 F)
1948
-33.3 C (-27.9 F)
1949
-37.2 C (-35.0 F)
1950
-42.8 C (-45.0 F)
1951
-37.2 C (-35.0 F)
1952
-33.9 C (-29.0 F)
1953
-28.3 C (-18.9 F)
1954
-41.1 C (-42.0 F)
1955
-34.4 C (-29.9 F)
1956
-36.1 C (-33.0 F)
1957
-40.0 C (-40.0 F)
1958
-33.3 C (-27.9 F)
1959
-32.2 C (-26.0 F)
1960
-36.7 C (-34.1 F)
1961
-31.7 C (-25.1 F)
1962
-32.2 C (-26.0 F)
1963
-35.0 C (-31.0 F)
1964
-34.4 C (-29.9 F)
1965
-33.3 C (-27.9 F)
1966
-33.3 C (-27.9 F)
1967
-31.1 C (-24.0 F)
1968
-41.1 C (-42.0 F)
1969
-41.7 C (-43.1 F)
1970
-36.7 C (-34.1 F)
1971
-36.1 C (-33.0 F)
1972
-39.4 C (-38.9 F)
1973
-31.1 C (-24.0 F)
1974
-36.1 C (-33.0 F)
1975
-34.4 C (-29.9 F)
1976
-30.6 C (-23.1 F)
1977
-37.2 C (-35.0 F)
1978
-33.0 C (-27.4 F)
1979
-38.5 C (-37.3 F)
1980
-34.0 C (-29.2 F)
1981
-30.5 C (-22.9 F)
1982
-37.0 C (-34.6 F)
1983
-38.0 C (-36.4 F)
Wettest day (Rx1day)
The wettest day of the year at Lethbridge Cda, 1908 to 1983. The record is 92.7 mm (3.6 in) in 1963, marked on the chart; the median year is 35.1 mm (1.4 in).
Wettest day (Rx1day) at Lethbridge Cda by year
Year
Wettest day (Rx1day)
1908
64.5 mm (2.5 in)
1909
28.7 mm (1.1 in)
1910
72.4 mm (2.9 in)
1911
34.5 mm (1.4 in)
1912
34.8 mm (1.4 in)
1913
27.9 mm (1.1 in)
1914
40.1 mm (1.6 in)
1915
29.7 mm (1.2 in)
1916
75.7 mm (3.0 in)
1917
31.0 mm (1.2 in)
1918
21.1 mm (0.8 in)
1919
18.5 mm (0.7 in)
1920
38.1 mm (1.5 in)
1921
24.9 mm (1.0 in)
1922
21.1 mm (0.8 in)
1923
52.1 mm (2.1 in)
1924
26.4 mm (1.0 in)
1925
25.9 mm (1.0 in)
1926
50.8 mm (2.0 in)
1927
36.6 mm (1.4 in)
1928
45.5 mm (1.8 in)
1929
42.7 mm (1.7 in)
1930
33.3 mm (1.3 in)
1931
18.0 mm (0.7 in)
1932
25.7 mm (1.0 in)
1933
34.8 mm (1.4 in)
1934
21.1 mm (0.8 in)
1935
17.5 mm (0.7 in)
1936
27.7 mm (1.1 in)
1937
56.4 mm (2.2 in)
1938
30.5 mm (1.2 in)
1939
55.6 mm (2.2 in)
1940
38.1 mm (1.5 in)
1941
55.1 mm (2.2 in)
1942
34.3 mm (1.4 in)
1943
20.1 mm (0.8 in)
1944
35.6 mm (1.4 in)
1945
34.3 mm (1.4 in)
1946
61.2 mm (2.4 in)
1947
34.3 mm (1.4 in)
1948
41.1 mm (1.6 in)
1949
26.7 mm (1.1 in)
1950
15.2 mm (0.6 in)
1951
48.3 mm (1.9 in)
1952
24.9 mm (1.0 in)
1953
45.2 mm (1.8 in)
1954
33.0 mm (1.3 in)
1955
29.0 mm (1.1 in)
1956
32.5 mm (1.3 in)
1957
35.3 mm (1.4 in)
1958
23.1 mm (0.9 in)
1959
64.8 mm (2.6 in)
1960
20.6 mm (0.8 in)
1961
19.3 mm (0.8 in)
1962
28.7 mm (1.1 in)
1963
92.7 mm (3.6 in)
1964
38.9 mm (1.5 in)
1965
46.0 mm (1.8 in)
1966
53.6 mm (2.1 in)
1967
33.3 mm (1.3 in)
1968
40.4 mm (1.6 in)
1969
41.7 mm (1.6 in)
1970
35.8 mm (1.4 in)
1971
28.2 mm (1.1 in)
1972
35.6 mm (1.4 in)
1973
27.4 mm (1.1 in)
1974
54.4 mm (2.1 in)
1975
42.4 mm (1.7 in)
1976
48.3 mm (1.9 in)
1977
35.6 mm (1.4 in)
1978
88.7 mm (3.5 in)
1979
91.6 mm (3.6 in)
1980
57.4 mm (2.3 in)
1981
55.8 mm (2.2 in)
1982
43.2 mm (1.7 in)
1983
15.4 mm (0.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Lethbridge Cda, 1908 to 1983. The record is 128.3 mm (5.1 in) in 1908, marked on the chart; the median year is 58.4 mm (2.3 in).
Wettest five days (Rx5day) at Lethbridge Cda by year
Year
Wettest five days (Rx5day)
1908
128.3 mm (5.1 in)
1909
44.2 mm (1.7 in)
1910
72.4 mm (2.9 in)
1911
90.4 mm (3.6 in)
1912
44.2 mm (1.7 in)
1913
59.8 mm (2.4 in)
1914
46.7 mm (1.8 in)
1915
57.9 mm (2.3 in)
1916
115.6 mm (4.6 in)
1917
32.0 mm (1.3 in)
1918
25.1 mm (1.0 in)
1919
34.5 mm (1.4 in)
1920
49.8 mm (2.0 in)
1921
49.3 mm (1.9 in)
1922
36.1 mm (1.4 in)
1923
72.4 mm (2.9 in)
1924
41.4 mm (1.6 in)
1925
45.4 mm (1.8 in)
1926
106.4 mm (4.2 in)
1927
111.3 mm (4.4 in)
1928
66.1 mm (2.6 in)
1929
52.6 mm (2.1 in)
1930
34.6 mm (1.4 in)
1931
32.7 mm (1.3 in)
1932
60.8 mm (2.4 in)
1933
44.2 mm (1.7 in)
1934
65.7 mm (2.6 in)
1935
31.5 mm (1.2 in)
1936
39.7 mm (1.6 in)
1937
68.8 mm (2.7 in)
1938
36.1 mm (1.4 in)
1939
105.9 mm (4.2 in)
1940
60.0 mm (2.4 in)
1941
56.4 mm (2.2 in)
1942
58.5 mm (2.3 in)
1943
20.8 mm (0.8 in)
1944
62.8 mm (2.5 in)
1945
58.2 mm (2.3 in)
1946
78.7 mm (3.1 in)
1947
81.0 mm (3.2 in)
1948
75.5 mm (3.0 in)
1949
51.1 mm (2.0 in)
1950
18.5 mm (0.7 in)
1951
68.9 mm (2.7 in)
1952
37.3 mm (1.5 in)
1953
96.8 mm (3.8 in)
1954
57.6 mm (2.3 in)
1955
70.7 mm (2.8 in)
1956
70.1 mm (2.8 in)
1957
44.0 mm (1.7 in)
1958
33.7 mm (1.3 in)
1959
89.4 mm (3.5 in)
1960
39.2 mm (1.5 in)
1961
35.6 mm (1.4 in)
1962
29.2 mm (1.1 in)
1963
114.5 mm (4.5 in)
1964
76.2 mm (3.0 in)
1965
76.6 mm (3.0 in)
1966
72.9 mm (2.9 in)
1967
50.5 mm (2.0 in)
1968
88.7 mm (3.5 in)
1969
42.5 mm (1.7 in)
1970
62.4 mm (2.5 in)
1971
53.1 mm (2.1 in)
1972
47.3 mm (1.9 in)
1973
38.3 mm (1.5 in)
1974
76.2 mm (3.0 in)
1975
70.3 mm (2.8 in)
1976
62.0 mm (2.4 in)
1977
36.9 mm (1.5 in)
1978
124.1 mm (4.9 in)
1979
102.8 mm (4.0 in)
1980
84.6 mm (3.3 in)
1981
87.2 mm (3.4 in)
1982
61.2 mm (2.4 in)
1983
29.0 mm (1.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Lethbridge Cda, 1908 to 1983. The record is 66 days in 1969, marked on the chart; the median year is 32 days.
Longest dry spell (CDD) at Lethbridge Cda by year
Year
Longest dry spell (CDD)
1908
44 days
1909
31 days
1910
31 days
1911
32 days
1912
26 days
1913
49 days
1914
23 days
1915
42 days
1916
30 days
1917
34 days
1918
36 days
1919
36 days
1920
37 days
1921
26 days
1922
44 days
1923
28 days
1924
27 days
1925
28 days
1926
27 days
1927
20 days
1928
29 days
1929
26 days
1930
26 days
1931
36 days
1932
32 days
1933
23 days
1934
35 days
1935
44 days
1936
39 days
1937
30 days
1938
35 days
1939
41 days
1940
31 days
1941
24 days
1942
23 days
1943
38 days
1944
32 days
1945
25 days
1946
28 days
1947
23 days
1948
46 days
1949
32 days
1950
34 days
1951
28 days
1952
38 days
1953
26 days
1954
56 days
1955
24 days
1956
24 days
1957
22 days
1958
25 days
1959
31 days
1960
45 days
1961
28 days
1962
33 days
1963
51 days
1964
37 days
1965
46 days
1966
19 days
1967
34 days
1968
36 days
1969
66 days
1970
25 days
1971
21 days
1972
33 days
1973
39 days
1974
41 days
1975
18 days
1976
40 days
1977
48 days
1978
33 days
1979
22 days
1980
25 days
1981
33 days
1982
22 days
1983
23 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
75 years with a frost
Across 75 years with a frost, the median last spring frost at Lethbridge Cda falls on 21 May and the median first autumn frost on 14 September, which leaves a median of 117 days between them.
In 1954 to 1983 the median growing season was 117 days. That is 2 days more than in 1909 to 1938.
Fitted over all years, the growing season changes by +1.2 days per decade at this station.
Frost dates and growing season at Lethbridge Cda
Measure
Median, all years
Earliest period (1909 to 1938)
Recent period (1954 to 1983)
Recent against earliest
Fitted trend
Last spring frost
21 May
23 May
20 May
3 days earlier
-0.9 days per decade
First autumn frost
14 September
14 September
13 September
1 day earlier
+0.3 days per decade
Growing days
117 days
115 days
117 days
2 days more
+1.2 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
76 years, 1908 to 1983
A day with at least 35.4 mm (1.4 in) of rain is expected about once in 2 years. A day with at least 100.4 mm (4.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Lethbridge Cda: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
35.4 mm (1.4 in)
5 years
50.4 mm (2.0 in)
10 years
61.2 mm (2.4 in)
25 years
76.0 mm (3.0 in)
50 years
87.9 mm (3.5 in)
100 years
100.4 mm (4.0 in)
Longer than the 76 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, 76 years of values from 1908 to 1983.
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: 92.7 mm (3.6 in) in 1963; 91.6 mm (3.6 in) in 1979; 88.7 mm (3.5 in) in 1978.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Lethbridge Cda, at 1965. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1965 ran 0.3 C (0.5 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Lethbridge Cda, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1965
+0.3
+0.5
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 Lethbridge Cda standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Lethbridge Cda 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.