Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Leader. 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 Leader, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
15.0 C (59.0 F)
-46.7 C (-52.1 F)
n/a
n/a
Feb
15.6 C (60.1 F)
-47.8 C (-54.0 F)
n/a
n/a
Mar
21.1 C (70.0 F)
-37.8 C (-36.0 F)
n/a
n/a
Apr
34.4 C (93.9 F)
-28.9 C (-20.0 F)
n/a
n/a
May
38.3 C (100.9 F)
-10.0 C (14.0 F)
n/a
n/a
Jun
41.1 C (106.0 F)
-3.9 C (25.0 F)
n/a
n/a
Jul
41.1 C (106.0 F)
-1.7 C (28.9 F)
n/a
n/a
Aug
41.1 C (106.0 F)
-2.2 C (28.0 F)
n/a
n/a
Sep
37.2 C (99.0 F)
-11.7 C (10.9 F)
n/a
n/a
Oct
33.9 C (93.0 F)
-25.0 C (-13.0 F)
n/a
n/a
Nov
22.8 C (73.0 F)
-34.4 C (-29.9 F)
n/a
n/a
Dec
19.4 C (66.9 F)
-41.7 C (-43.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Leader still stand. 1936 holds the most, with 71.
Standing records at Leader by the year they were set
Year set
Standing records
1924
54
1925
42
1926
40
1927
31
1928
43
1929
41
1930
45
1931
57
1932
33
1933
29
1934
41
1935
37
1936
71
1937
25
1938
17
1939
41
1940
27
1941
25
1942
34
1943
33
1944
17
1945
16
1946
23
1947
21
1948
24
1949
34
1950
35
1951
30
1952
28
1953
21
1954
54
1955
26
1956
26
1957
25
1958
15
1959
33
1960
15
1961
33
1962
31
1963
27
1964
20
1965
34
1966
24
1967
21
1968
35
1969
30
All-Time Record Progression
1 new records
1 all-time records were set at Leader between 25 March 1957 and 25 March 1957. Each dot is a new record.
When Leader set new all-time records
Date
Kind
Detail
1957-03-25
Record daily snowfall
Record daily snowfall 30.5 cm (12.0 in)
Wettest Day of Each Month
Jul: 96.5 mm (3.8 in)
The wettest day on record for each calendar month at Leader. The most was 96.5 mm (3.8 in) on 4 July 1927.
Record daily precipitation for each month at Leader
Month
Record daily precipitation (mm)
Date
Jan
15.7 mm (0.6 in)
5 January 1967
Feb
20.3 mm (0.8 in)
23 February 1956
Mar
30.5 mm (1.2 in)
25 March 1957
Apr
26.9 mm (1.1 in)
29 April 1969
May
69.6 mm (2.7 in)
20 May 1939
Jun
63.5 mm (2.5 in)
13 June 1923
Jul
96.5 mm (3.8 in)
4 July 1927
Aug
57.2 mm (2.3 in)
6 August 1965
Sep
53.6 mm (2.1 in)
5 September 1954
Oct
19.1 mm (0.8 in)
26 October 1940
Nov
17.8 mm (0.7 in)
16 November 1966
Dec
20.3 mm (0.8 in)
14 December 1924
Period of Record Coverage
1924 to 1969
Complete yearUnder 90 percent of days
46 years of record at Leader, 1924 to 1969. 3 years have data for under 90 percent of days and are left out of rankings: 1950, 1951, 1969.
Cooler than the station meanWarmer than the station mean
One stripe for each of 39 complete years at Leader, 1924 to 1968. Blue stripes are years cooler than the station's own mean of 3.6 C (38.5 F); red stripes are warmer. The coolest year was 1965, at 1.5 C (34.6 F), and the warmest was 1931, at 5.8 C (42.5 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Leader as warming stripes, 1924 to 1968
Year
Annual mean temperature
Difference from the station mean
1924
4.4 C
+0.77 C
1925
3.7 C
+0.07 C
1926
4.5 C
+0.85 C
1927
1.7 C
-1.97 C
1928
4.4 C
+0.75 C
1929
2.7 C
-0.93 C
1930
4.9 C
+1.31 C
1931
5.8 C
+2.20 C
1932
2.8 C
-0.84 C
1933
3.2 C
-0.41 C
1934
4.9 C
+1.31 C
1935
1.6 C
-2.04 C
1936
2.3 C
-1.33 C
1937
3.3 C
-0.31 C
1938
4.7 C
+1.06 C
1939
4.4 C
+0.74 C
1940
3.5 C
-0.16 C
1941
5.3 C
+1.62 C
1942
4.5 C
+0.90 C
1943
4.3 C
+0.67 C
1944
4.8 C
+1.20 C
1945
3.0 C
-0.60 C
1946
4.1 C
+0.43 C
1947
3.3 C
-0.32 C
1948
3.5 C
-0.09 C
1952
3.7 C
+0.06 C
1953
4.7 C
+1.09 C
1954
3.5 C
-0.17 C
1955
1.6 C
-2.00 C
1956
2.8 C
-0.86 C
1957
3.8 C
+0.21 C
1958
4.6 C
+0.96 C
1959
3.1 C
-0.51 C
1960
3.6 C
0.00 C
1961
4.4 C
+0.72 C
1965
1.5 C
-2.16 C
1966
2.0 C
-1.66 C
1967
2.9 C
-0.77 C
1968
4.0 C
+0.32 C
The fitted trend in annual mean temperature here over 1924 to 1968 is -0.2 C (-0.5 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.3 F (-0.8 to 0.1) per decade. The slope is a straight line fitted to 39 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Leader
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.2 C (-0.5 to 0.1) per decade
-0.3 F (-0.8 to 0.1) per decade
1924 to 1968
39
Not clearly different from zero
Mean daily maximum
-0.2 C (-0.6 to 0.1) per decade
-0.4 F (-1.1 to 0.2) per decade
1924 to 1968
39
Not clearly different from zero
Mean daily minimum
-0.1 C (-0.4 to 0.1) per decade
-0.3 F (-0.7 to 0.2) per decade
1924 to 1968
39
Not clearly different from zero
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 1969
Yearly extremes at Leader: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.1 C (106.0 F)
1933
37.8 C (100.0 F)
46
Coldest night (TNn)
-47.8 C (-54.0 F)
1936
-38.6 C (-37.5 F)
46
Wettest day (Rx1day)
96.5 mm (3.8 in)
1927
28.3 mm (1.1 in)
48
Wettest five days (Rx5day)
133.6 mm (5.3 in)
1927
42.1 mm (1.7 in)
48
Longest dry spell (CDD)
83 days
1928
38 days
48
Hottest day (TXx)
The hottest day of the year at Leader, 1922 to 1969. The record is 41.1 C (106.0 F) in 1933, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at Leader by year
Year
Hottest day (TXx)
1922
n/a
1923
n/a
1924
36.7 C (98.1 F)
1925
37.8 C (100.0 F)
1926
38.3 C (100.9 F)
1927
32.8 C (91.0 F)
1928
37.8 C (100.0 F)
1929
40.0 C (104.0 F)
1930
37.8 C (100.0 F)
1931
40.0 C (104.0 F)
1932
37.2 C (99.0 F)
1933
41.1 C (106.0 F)
1934
38.9 C (102.0 F)
1935
38.3 C (100.9 F)
1936
41.1 C (106.0 F)
1937
41.1 C (106.0 F)
1938
38.3 C (100.9 F)
1939
39.4 C (102.9 F)
1940
37.8 C (100.0 F)
1941
41.1 C (106.0 F)
1942
37.2 C (99.0 F)
1943
39.4 C (102.9 F)
1944
38.9 C (102.0 F)
1945
39.4 C (102.9 F)
1946
38.9 C (102.0 F)
1947
38.9 C (102.0 F)
1948
38.9 C (102.0 F)
1949
39.4 C (102.9 F)
1950
36.7 C (98.1 F)
1951
37.2 C (99.0 F)
1952
35.0 C (95.0 F)
1953
36.7 C (98.1 F)
1954
35.6 C (96.1 F)
1955
36.1 C (97.0 F)
1956
36.7 C (98.1 F)
1957
37.2 C (99.0 F)
1958
37.2 C (99.0 F)
1959
35.6 C (96.1 F)
1960
40.0 C (104.0 F)
1961
41.1 C (106.0 F)
1962
33.3 C (91.9 F)
1963
37.2 C (99.0 F)
1964
37.2 C (99.0 F)
1965
33.9 C (93.0 F)
1966
33.9 C (93.0 F)
1967
37.2 C (99.0 F)
1968
35.0 C (95.0 F)
1969
37.2 C (99.0 F)
Coldest night (TNn)
The coldest night of the year at Leader, 1922 to 1969. The record is -47.8 C (-54.0 F) in 1936, marked on the chart; the median year is -38.6 C (-37.5 F).
Coldest night (TNn) at Leader by year
Year
Coldest night (TNn)
1922
n/a
1923
n/a
1924
-41.1 C (-42.0 F)
1925
-34.4 C (-29.9 F)
1926
-35.6 C (-32.1 F)
1927
-41.7 C (-43.1 F)
1928
-40.0 C (-40.0 F)
1929
-43.3 C (-45.9 F)
1930
-40.6 C (-41.1 F)
1931
-29.4 C (-20.9 F)
1932
-38.9 C (-38.0 F)
1933
-36.1 C (-33.0 F)
1934
-38.9 C (-38.0 F)
1935
-42.2 C (-44.0 F)
1936
-47.8 C (-54.0 F)
1937
-41.1 C (-42.0 F)
1938
-38.9 C (-38.0 F)
1939
-42.8 C (-45.0 F)
1940
-36.1 C (-33.0 F)
1941
-32.8 C (-27.0 F)
1942
-33.3 C (-27.9 F)
1943
-46.7 C (-52.1 F)
1944
-35.0 C (-31.0 F)
1945
-32.8 C (-27.0 F)
1946
-35.6 C (-32.1 F)
1947
-41.1 C (-42.0 F)
1948
-35.6 C (-32.1 F)
1949
-36.7 C (-34.1 F)
1950
-43.9 C (-47.0 F)
1951
-39.4 C (-38.9 F)
1952
-40.0 C (-40.0 F)
1953
-33.9 C (-29.0 F)
1954
-45.6 C (-50.1 F)
1955
-36.7 C (-34.1 F)
1956
-39.4 C (-38.9 F)
1957
-36.7 C (-34.1 F)
1958
-36.1 C (-33.0 F)
1959
-35.0 C (-31.0 F)
1960
-32.2 C (-26.0 F)
1961
-36.1 C (-33.0 F)
1962
-41.1 C (-42.0 F)
1963
-38.3 C (-36.9 F)
1964
-37.8 C (-36.0 F)
1965
-35.6 C (-32.1 F)
1966
-37.2 C (-35.0 F)
1967
-39.4 C (-38.9 F)
1968
-40.6 C (-41.1 F)
1969
-43.3 C (-45.9 F)
Wettest day (Rx1day)
The wettest day of the year at Leader, 1922 to 1969. The record is 96.5 mm (3.8 in) in 1927, marked on the chart; the median year is 28.3 mm (1.1 in).
Wettest day (Rx1day) at Leader by year
Year
Wettest day (Rx1day)
1922
31.8 mm (1.3 in)
1923
63.5 mm (2.5 in)
1924
23.6 mm (0.9 in)
1925
31.8 mm (1.3 in)
1926
20.1 mm (0.8 in)
1927
96.5 mm (3.8 in)
1928
14.2 mm (0.6 in)
1929
16.5 mm (0.6 in)
1930
44.5 mm (1.8 in)
1931
25.4 mm (1.0 in)
1932
27.2 mm (1.1 in)
1933
18.8 mm (0.7 in)
1934
55.9 mm (2.2 in)
1935
21.6 mm (0.9 in)
1936
33.0 mm (1.3 in)
1937
14.5 mm (0.6 in)
1938
19.1 mm (0.8 in)
1939
69.6 mm (2.7 in)
1940
39.4 mm (1.6 in)
1941
28.2 mm (1.1 in)
1942
29.2 mm (1.1 in)
1943
29.5 mm (1.2 in)
1944
27.2 mm (1.1 in)
1945
25.4 mm (1.0 in)
1946
44.5 mm (1.8 in)
1947
43.7 mm (1.7 in)
1948
11.2 mm (0.4 in)
1949
20.8 mm (0.8 in)
1950
28.4 mm (1.1 in)
1951
28.4 mm (1.1 in)
1952
22.4 mm (0.9 in)
1953
58.9 mm (2.3 in)
1954
53.6 mm (2.1 in)
1955
36.8 mm (1.4 in)
1956
26.7 mm (1.1 in)
1957
30.5 mm (1.2 in)
1958
19.1 mm (0.8 in)
1959
35.8 mm (1.4 in)
1960
20.3 mm (0.8 in)
1961
22.6 mm (0.9 in)
1962
30.0 mm (1.2 in)
1963
26.4 mm (1.0 in)
1964
25.9 mm (1.0 in)
1965
57.2 mm (2.3 in)
1966
40.6 mm (1.6 in)
1967
15.7 mm (0.6 in)
1968
28.7 mm (1.1 in)
1969
26.9 mm (1.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Leader, 1922 to 1969. The record is 133.6 mm (5.3 in) in 1927, marked on the chart; the median year is 42.1 mm (1.7 in).
Wettest five days (Rx5day) at Leader by year
Year
Wettest five days (Rx5day)
1922
53.5 mm (2.1 in)
1923
116.6 mm (4.6 in)
1924
40.7 mm (1.6 in)
1925
52.1 mm (2.1 in)
1926
23.9 mm (0.9 in)
1927
133.6 mm (5.3 in)
1928
35.0 mm (1.4 in)
1929
21.6 mm (0.9 in)
1930
44.5 mm (1.8 in)
1931
36.3 mm (1.4 in)
1932
31.8 mm (1.3 in)
1933
22.1 mm (0.9 in)
1934
87.6 mm (3.4 in)
1935
42.2 mm (1.7 in)
1936
33.0 mm (1.3 in)
1937
16.2 mm (0.6 in)
1938
35.3 mm (1.4 in)
1939
87.1 mm (3.4 in)
1940
44.0 mm (1.7 in)
1941
39.1 mm (1.5 in)
1942
51.2 mm (2.0 in)
1943
34.8 mm (1.4 in)
1944
28.5 mm (1.1 in)
1945
25.4 mm (1.0 in)
1946
44.5 mm (1.8 in)
1947
75.2 mm (3.0 in)
1948
17.1 mm (0.7 in)
1949
39.6 mm (1.6 in)
1950
41.9 mm (1.6 in)
1951
51.2 mm (2.0 in)
1952
38.5 mm (1.5 in)
1953
79.2 mm (3.1 in)
1954
56.6 mm (2.2 in)
1955
67.3 mm (2.6 in)
1956
52.2 mm (2.1 in)
1957
33.3 mm (1.3 in)
1958
30.5 mm (1.2 in)
1959
50.0 mm (2.0 in)
1960
29.1 mm (1.1 in)
1961
31.0 mm (1.2 in)
1962
43.2 mm (1.7 in)
1963
51.6 mm (2.0 in)
1964
38.1 mm (1.5 in)
1965
99.1 mm (3.9 in)
1966
69.1 mm (2.7 in)
1967
28.0 mm (1.1 in)
1968
54.2 mm (2.1 in)
1969
42.2 mm (1.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Leader, 1922 to 1969. The record is 83 days in 1928, marked on the chart; the median year is 38 days.
Longest dry spell (CDD) at Leader by year
Year
Longest dry spell (CDD)
1922
26 days
1923
64 days
1924
23 days
1925
45 days
1926
31 days
1927
41 days
1928
83 days
1929
28 days
1930
36 days
1931
46 days
1932
34 days
1933
49 days
1934
43 days
1935
39 days
1936
38 days
1937
39 days
1938
39 days
1939
46 days
1940
35 days
1941
64 days
1942
28 days
1943
60 days
1944
48 days
1945
50 days
1946
43 days
1947
32 days
1948
56 days
1949
46 days
1950
38 days
1951
35 days
1952
30 days
1953
35 days
1954
35 days
1955
42 days
1956
32 days
1957
30 days
1958
30 days
1959
28 days
1960
57 days
1961
37 days
1962
41 days
1963
30 days
1964
31 days
1965
43 days
1966
25 days
1967
29 days
1968
24 days
1969
34 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
39 years with a frost
Across 39 years with a frost, the median last spring frost at Leader falls on 19 May and the median first autumn frost on 15 September, which leaves a median of 117 days between them.
Fitted over all years, the growing season changes by +1.5 days per decade at this station.
Frost dates and growing season at Leader
Measure
Median, all years
Earliest period
Recent period (1933 to 1968)
Recent against earliest
Fitted trend
Last spring frost
19 May
n/a
19 May
n/a
+1.6 days per decade
First autumn frost
15 September
n/a
19 September
n/a
+3.1 days per decade
Growing days
117 days
n/a
118 days
n/a
+1.5 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.
Rainfall Return Levels
43 years, 1924 to 1968
A day with at least 27.5 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 99.0 mm (3.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Leader: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
27.5 mm (1.1 in)
5 years
40.5 mm (1.6 in)
10 years
51.1 mm (2.0 in)
25 years
67.4 mm (2.7 in)
50 years
82.0 mm (3.2 in)
Longer than the 43 years of record
100 years
99.0 mm (3.9 in)
Longer than the 43 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, 43 years of values from 1924 to 1968.
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: 96.5 mm (3.8 in) in 1927; 69.6 mm (2.7 in) in 1939; 58.9 mm (2.3 in) in 1953.
Download the Data
Data for Leader standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Leader 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.