Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Mont Louis. 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 Mont Louis, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
11.1 C (52.0 F)
-35.0 C (-31.0 F)
n/a
n/a
Feb
15.6 C (60.1 F)
-29.4 C (-20.9 F)
n/a
n/a
Mar
20.0 C (68.0 F)
-25.6 C (-14.1 F)
n/a
n/a
Apr
22.8 C (73.0 F)
-16.7 C (1.9 F)
n/a
n/a
May
30.0 C (86.0 F)
-10.0 C (14.0 F)
n/a
n/a
Jun
36.7 C (98.1 F)
-1.1 C (30.0 F)
n/a
n/a
Jul
34.5 C (94.1 F)
1.1 C (34.0 F)
n/a
n/a
Aug
35.6 C (96.1 F)
1.7 C (35.1 F)
n/a
n/a
Sep
32.2 C (90.0 F)
-3.3 C (26.1 F)
n/a
n/a
Oct
26.7 C (80.1 F)
-9.4 C (15.1 F)
n/a
n/a
Nov
21.7 C (71.1 F)
-17.2 C (1.0 F)
n/a
n/a
Dec
17.8 C (64.0 F)
-27.8 C (-18.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Mont Louis still stand. 1941 holds the most, with 66.
Standing records at Mont Louis by the year they were set
Year set
Standing records
1939
26
1940
29
1941
66
1942
37
1943
36
1944
42
1945
40
1946
47
1947
49
1948
52
1950
25
1951
37
1952
29
1953
33
1954
48
1955
25
1956
29
1957
53
1958
15
1959
36
1960
28
1961
24
1962
23
1963
44
1964
24
1965
35
1966
25
1967
28
1968
24
1969
22
1970
24
1971
27
1972
61
1973
25
1974
24
1975
24
1976
32
1977
23
1978
26
1979
49
1980
32
1981
28
1982
31
1983
27
All-Time Record Progression
3 new records
3 all-time records were set at Mont Louis between 27 June 1975 and 8 October 1981. Each dot is a new record.
When Mont Louis set new all-time records
Date
Kind
Detail
1975-06-27
Record high minimum temperature
Record high minimum temperature 23.9 C (75.0 F)
1981-01-04
Record low minimum temperature
Record low minimum temperature -35.0 C (-31.0 F)
1981-10-08
Record daily precipitation
Record daily precipitation 144.0 mm (5.7 in)
Wettest Day of Each Month
Oct: 144.0 mm (5.7 in)
The wettest day on record for each calendar month at Mont Louis. The most was 144.0 mm (5.7 in) on 8 October 1981.
Record daily precipitation for each month at Mont Louis
Month
Record daily precipitation (mm)
Date
Jan
76.2 mm (3.0 in)
28 January 1966
Feb
76.2 mm (3.0 in)
7 February 1951
Mar
61.0 mm (2.4 in)
23 March 1940
Apr
43.9 mm (1.7 in)
10 April 1963
May
75.7 mm (3.0 in)
25 May 1941
Jun
66.0 mm (2.6 in)
22 June 1937
Jul
66.5 mm (2.6 in)
17 July 1958
Aug
117.9 mm (4.6 in)
29 August 1955
Sep
95.3 mm (3.8 in)
22 September 1948
Oct
144.0 mm (5.7 in)
8 October 1981
Nov
49.6 mm (2.0 in)
6 November 1983
Dec
59.4 mm (2.3 in)
10 December 1981
Period of Record Coverage
1939 to 1983
Complete yearUnder 90 percent of days
44 years of record at Mont Louis, 1939 to 1983. 8 years have data for under 90 percent of days and are left out of rankings: 1939, 1940, 1947, 1950, 1951, 1962, 1965, 1969.
Cooler than the station meanWarmer than the station mean
One stripe for each of 29 complete years at Mont Louis, 1941 to 1983. 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 1972, at 1.3 C (34.4 F), and the warmest was 1953, at 4.9 C (40.8 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Mont Louis as warming stripes, 1941 to 1983
Year
Annual mean temperature
Difference from the station mean
1941
2.5 C
-1.16 C
1942
3.6 C
-0.04 C
1943
2.8 C
-0.85 C
1944
4.1 C
+0.47 C
1945
4.1 C
+0.44 C
1946
3.4 C
-0.19 C
1952
4.2 C
+0.55 C
1953
4.9 C
+1.26 C
1954
3.8 C
+0.14 C
1955
4.3 C
+0.66 C
1956
3.1 C
-0.51 C
1958
3.7 C
+0.06 C
1959
4.3 C
+0.67 C
1960
4.7 C
+1.10 C
1961
3.9 C
+0.26 C
1963
3.6 C
-0.07 C
1964
3.2 C
-0.42 C
1967
3.3 C
-0.33 C
1972
1.3 C
-2.29 C
1973
4.0 C
+0.35 C
1975
4.1 C
+0.47 C
1976
2.9 C
-0.73 C
1977
4.1 C
+0.49 C
1978
2.8 C
-0.85 C
1979
4.4 C
+0.82 C
1980
2.7 C
-0.94 C
1981
4.4 C
+0.78 C
1982
3.0 C
-0.61 C
1983
4.2 C
+0.54 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
1933 to 1983
Yearly extremes at Mont Louis: 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)
1942
31.7 C (89.1 F)
44
Coldest night (TNn)
-35.0 C (-31.0 F)
1981
-26.4 C (-15.5 F)
44
Wettest day (Rx1day)
144.0 mm (5.7 in)
1981
42.9 mm (1.7 in)
50
Wettest five days (Rx5day)
244.6 mm (9.6 in)
1981
67.7 mm (2.7 in)
50
Longest dry spell (CDD)
26 days
1958
16 days
50
Hottest day (TXx)
The hottest day of the year at Mont Louis, 1933 to 1983. The record is 36.7 C (98.1 F) in 1942, marked on the chart; the median year is 31.7 C (89.1 F).
Hottest day (TXx) at Mont Louis by year
Year
Hottest day (TXx)
1933
n/a
1934
n/a
1935
n/a
1936
n/a
1937
n/a
1938
n/a
1939
32.2 C (90.0 F)
1940
29.4 C (84.9 F)
1941
33.3 C (91.9 F)
1942
36.7 C (98.1 F)
1943
33.9 C (93.0 F)
1944
32.2 C (90.0 F)
1945
31.1 C (88.0 F)
1946
32.2 C (90.0 F)
1947
32.2 C (90.0 F)
1948
29.4 C (84.9 F)
1950
31.7 C (89.1 F)
1951
31.7 C (89.1 F)
1952
33.3 C (91.9 F)
1953
30.0 C (86.0 F)
1954
26.7 C (80.1 F)
1955
34.4 C (93.9 F)
1956
26.7 C (80.1 F)
1957
27.8 C (82.0 F)
1958
26.7 C (80.1 F)
1959
32.2 C (90.0 F)
1960
31.1 C (88.0 F)
1961
27.8 C (82.0 F)
1962
30.0 C (86.0 F)
1963
31.1 C (88.0 F)
1964
28.3 C (82.9 F)
1965
31.7 C (89.1 F)
1966
28.9 C (84.0 F)
1967
31.1 C (88.0 F)
1968
32.2 C (90.0 F)
1969
31.1 C (88.0 F)
1970
31.7 C (89.1 F)
1971
32.2 C (90.0 F)
1972
31.7 C (89.1 F)
1973
28.3 C (82.9 F)
1974
28.3 C (82.9 F)
1975
31.7 C (89.1 F)
1976
32.2 C (90.0 F)
1977
35.6 C (96.1 F)
1978
32.2 C (90.0 F)
1979
32.8 C (91.0 F)
1980
30.0 C (86.0 F)
1981
31.0 C (87.8 F)
1982
30.0 C (86.0 F)
1983
34.5 C (94.1 F)
Coldest night (TNn)
The coldest night of the year at Mont Louis, 1933 to 1983. The record is -35.0 C (-31.0 F) in 1981, marked on the chart; the median year is -26.4 C (-15.5 F).
Coldest night (TNn) at Mont Louis by year
Year
Coldest night (TNn)
1933
n/a
1934
n/a
1935
n/a
1936
n/a
1937
n/a
1938
n/a
1939
-15.6 C (3.9 F)
1940
-21.7 C (-7.1 F)
1941
-28.9 C (-20.0 F)
1942
-28.3 C (-18.9 F)
1943
-28.3 C (-18.9 F)
1944
-26.1 C (-15.0 F)
1945
-24.4 C (-11.9 F)
1946
-26.1 C (-15.0 F)
1947
-27.2 C (-17.0 F)
1948
-26.1 C (-15.0 F)
1950
1.7 C (35.1 F)
1951
-27.8 C (-18.0 F)
1952
-25.6 C (-14.1 F)
1953
-22.2 C (-8.0 F)
1954
-25.6 C (-14.1 F)
1955
-23.3 C (-9.9 F)
1956
-21.1 C (-6.0 F)
1957
-32.2 C (-26.0 F)
1958
-22.2 C (-8.0 F)
1959
-25.6 C (-14.1 F)
1960
-26.7 C (-16.1 F)
1961
-27.8 C (-18.0 F)
1962
-28.9 C (-20.0 F)
1963
-27.8 C (-18.0 F)
1964
-24.4 C (-11.9 F)
1965
-25.6 C (-14.1 F)
1966
-29.4 C (-20.9 F)
1967
-26.7 C (-16.1 F)
1968
-29.4 C (-20.9 F)
1969
-21.7 C (-7.1 F)
1970
-24.4 C (-11.9 F)
1971
-27.2 C (-17.0 F)
1972
-27.8 C (-18.0 F)
1973
-29.4 C (-20.9 F)
1974
-24.4 C (-11.9 F)
1975
-30.0 C (-22.0 F)
1976
-28.9 C (-20.0 F)
1977
-25.0 C (-13.0 F)
1978
-27.2 C (-17.0 F)
1979
-27.8 C (-18.0 F)
1980
-26.0 C (-14.8 F)
1981
-35.0 C (-31.0 F)
1982
-30.0 C (-22.0 F)
1983
-24.0 C (-11.2 F)
Wettest day (Rx1day)
The wettest day of the year at Mont Louis, 1933 to 1983. The record is 144.0 mm (5.7 in) in 1981, marked on the chart; the median year is 42.9 mm (1.7 in).
Wettest day (Rx1day) at Mont Louis by year
Year
Wettest day (Rx1day)
1933
38.6 mm (1.5 in)
1934
33.3 mm (1.3 in)
1935
35.6 mm (1.4 in)
1936
40.6 mm (1.6 in)
1937
66.0 mm (2.6 in)
1938
29.5 mm (1.2 in)
1939
61.0 mm (2.4 in)
1940
61.0 mm (2.4 in)
1941
75.7 mm (3.0 in)
1942
40.1 mm (1.6 in)
1943
74.9 mm (2.9 in)
1944
41.7 mm (1.6 in)
1945
40.6 mm (1.6 in)
1946
25.4 mm (1.0 in)
1947
31.0 mm (1.2 in)
1948
95.3 mm (3.8 in)
1950
33.0 mm (1.3 in)
1951
76.2 mm (3.0 in)
1952
59.9 mm (2.4 in)
1953
53.1 mm (2.1 in)
1954
89.9 mm (3.5 in)
1955
117.9 mm (4.6 in)
1956
35.6 mm (1.4 in)
1957
35.6 mm (1.4 in)
1958
66.5 mm (2.6 in)
1959
45.7 mm (1.8 in)
1960
45.7 mm (1.8 in)
1961
36.6 mm (1.4 in)
1962
47.8 mm (1.9 in)
1963
43.9 mm (1.7 in)
1964
40.6 mm (1.6 in)
1965
49.0 mm (1.9 in)
1966
76.2 mm (3.0 in)
1967
36.1 mm (1.4 in)
1968
38.1 mm (1.5 in)
1969
35.1 mm (1.4 in)
1970
46.2 mm (1.8 in)
1971
29.7 mm (1.2 in)
1972
26.2 mm (1.0 in)
1973
48.3 mm (1.9 in)
1974
41.9 mm (1.6 in)
1975
24.9 mm (1.0 in)
1976
28.4 mm (1.1 in)
1977
50.0 mm (2.0 in)
1978
30.0 mm (1.2 in)
1979
69.6 mm (2.7 in)
1980
63.0 mm (2.5 in)
1981
144.0 mm (5.7 in)
1982
31.6 mm (1.2 in)
1983
49.6 mm (2.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Mont Louis, 1933 to 1983. The record is 244.6 mm (9.6 in) in 1981, marked on the chart; the median year is 67.7 mm (2.7 in).
Wettest five days (Rx5day) at Mont Louis by year
Year
Wettest five days (Rx5day)
1933
41.1 mm (1.6 in)
1934
50.2 mm (2.0 in)
1935
63.5 mm (2.5 in)
1936
55.4 mm (2.2 in)
1937
85.2 mm (3.4 in)
1938
41.7 mm (1.6 in)
1939
78.7 mm (3.1 in)
1940
91.5 mm (3.6 in)
1941
104.7 mm (4.1 in)
1942
56.2 mm (2.2 in)
1943
138.7 mm (5.5 in)
1944
51.1 mm (2.0 in)
1945
99.0 mm (3.9 in)
1946
39.3 mm (1.5 in)
1947
71.6 mm (2.8 in)
1948
110.3 mm (4.3 in)
1950
35.5 mm (1.4 in)
1951
76.2 mm (3.0 in)
1952
63.2 mm (2.5 in)
1953
55.1 mm (2.2 in)
1954
67.6 mm (2.7 in)
1955
126.3 mm (5.0 in)
1956
40.9 mm (1.6 in)
1957
46.0 mm (1.8 in)
1958
67.8 mm (2.7 in)
1959
62.2 mm (2.4 in)
1960
132.1 mm (5.2 in)
1961
101.4 mm (4.0 in)
1962
60.7 mm (2.4 in)
1963
71.1 mm (2.8 in)
1964
63.5 mm (2.5 in)
1965
69.8 mm (2.7 in)
1966
152.4 mm (6.0 in)
1967
61.2 mm (2.4 in)
1968
73.7 mm (2.9 in)
1969
72.2 mm (2.8 in)
1970
48.5 mm (1.9 in)
1971
52.4 mm (2.1 in)
1972
61.7 mm (2.4 in)
1973
75.7 mm (3.0 in)
1974
57.1 mm (2.2 in)
1975
42.4 mm (1.7 in)
1976
75.1 mm (3.0 in)
1977
89.7 mm (3.5 in)
1978
51.0 mm (2.0 in)
1979
75.2 mm (3.0 in)
1980
97.7 mm (3.8 in)
1981
244.6 mm (9.6 in)
1982
63.9 mm (2.5 in)
1983
82.6 mm (3.3 in)
Longest dry spell (CDD)
The longest dry spell of the year at Mont Louis, 1933 to 1983. The record is 26 days in 1958, marked on the chart; the median year is 16 days.
Longest dry spell (CDD) at Mont Louis by year
Year
Longest dry spell (CDD)
1933
12 days
1934
19 days
1935
21 days
1936
21 days
1937
18 days
1938
25 days
1939
21 days
1940
20 days
1941
17 days
1942
21 days
1943
21 days
1944
16 days
1945
15 days
1946
19 days
1947
20 days
1948
25 days
1950
5 days
1951
17 days
1952
17 days
1953
8 days
1954
12 days
1955
13 days
1956
22 days
1957
20 days
1958
26 days
1959
15 days
1960
21 days
1961
17 days
1962
10 days
1963
21 days
1964
13 days
1965
19 days
1966
14 days
1967
10 days
1968
12 days
1969
15 days
1970
10 days
1971
16 days
1972
11 days
1973
11 days
1974
14 days
1975
11 days
1976
14 days
1977
16 days
1978
19 days
1979
13 days
1980
16 days
1981
14 days
1982
12 days
1983
10 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
29 years with a frost
Across 29 years with a frost, the median last spring frost at Mont Louis falls on 24 May and the median first autumn frost on 24 September, which leaves a median of 125 days between them.
Fitted over all years, the growing season changes by +0.3 days per decade at this station.
Frost dates and growing season at Mont Louis
Measure
Median, all years
Earliest period
Recent period (1941 to 1983)
Recent against earliest
Fitted trend
Last spring frost
24 May
n/a
24 May
n/a
-1.8 days per decade
First autumn frost
24 September
n/a
24 September
n/a
-1.5 days per decade
Growing days
125 days
n/a
125 days
n/a
+0.3 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
33 years, 1934 to 1983
A day with at least 44.0 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 159.3 mm (6.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Mont Louis: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
44.0 mm (1.7 in)
5 years
64.6 mm (2.5 in)
10 years
81.6 mm (3.2 in)
25 years
107.9 mm (4.2 in)
50 years
131.6 mm (5.2 in)
Longer than the 33 years of record
100 years
159.3 mm (6.3 in)
Longer than the 33 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, 33 years of values from 1934 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: 144.0 mm (5.7 in) in 1981; 117.9 mm (4.6 in) in 1955; 76.2 mm (3.0 in) in 1966.
Download the Data
Data for Mont Louis standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Mont Louis 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.