Record envelope, standing records and threshold days for South Slocan (CA001147620), British Columbia, Canada, with 69 years of record.
Key Facts for South Slocan
South Slocan (CA001147620) is a weather station in British Columbia, Canada at 49.47 latitude and -117.52 longitude, 457 m (1,499 ft) above sea level.
The station reports from 1940 to 2008, 69 years of record.
1,464 records set at South Slocan still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
South Slocan set a daily record low minimum temperature of -25.5 C (-13.9 F) on 24 December 1983.
About the Station
Location: British Columbia, Canada, 49.47 latitude, -117.52 longitude.
Elevation: 457 m (1,499 ft).
Period of record: 1940 to 2008, 69 years.
Eligible elements: tmax, tmin, prcp, snow.
Daily Record Envelope and 2026
0 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at South Slocan. 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 South Slocan, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
9.4 C (48.9 F)
-31.7 C (-25.1 F)
n/a
n/a
Feb
12.2 C (54.0 F)
-30.6 C (-23.1 F)
n/a
n/a
Mar
20.0 C (68.0 F)
-22.2 C (-8.0 F)
n/a
n/a
Apr
30.0 C (86.0 F)
-7.8 C (18.0 F)
n/a
n/a
May
33.9 C (93.0 F)
-6.1 C (21.0 F)
n/a
n/a
Jun
35.6 C (96.1 F)
0.0 C (32.0 F)
n/a
n/a
Jul
40.0 C (104.0 F)
2.8 C (37.0 F)
n/a
n/a
Aug
39.4 C (102.9 F)
2.2 C (36.0 F)
n/a
n/a
Sep
36.1 C (97.0 F)
-4.4 C (24.1 F)
n/a
n/a
Oct
26.1 C (79.0 F)
-8.9 C (16.0 F)
n/a
n/a
Nov
17.2 C (63.0 F)
-20.6 C (-5.1 F)
n/a
n/a
Dec
11.7 C (53.1 F)
-35.0 C (-31.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at South Slocan still stand. 1941 holds the most, with 68.
Standing records at South Slocan by the year they were set
Year set
Standing records
1940
8
1941
68
1942
34
1943
43
1944
40
1945
40
1946
26
1947
39
1948
22
1949
51
1950
59
1951
33
1952
36
1953
33
1954
51
1955
57
1956
40
1957
33
1958
52
1959
21
1960
38
1961
39
1962
30
1963
25
1964
22
1965
36
1966
19
1967
32
1968
19
1969
20
1970
16
1971
36
1972
39
1973
24
1974
30
1975
26
1976
13
1977
30
1978
25
1979
31
1980
32
1981
31
1982
26
1983
39
All-Time Record Progression
2 new records
2 all-time records were set at South Slocan between 7 January 1982 and 29 June 1982. Each dot is a new record.
When South Slocan set new all-time records
Date
Kind
Detail
1982-01-07
Record daily snowfall
Record daily snowfall 45.0 cm (17.7 in)
1982-06-29
Record daily precipitation
Record daily precipitation 73.1 mm (2.9 in)
Wettest Day of Each Month
Jun: 73.1 mm (2.9 in)
The wettest day on record for each calendar month at South Slocan. The most was 73.1 mm (2.9 in) on 29 June 1982.
Record daily precipitation for each month at South Slocan
Month
Record daily precipitation (mm)
Date
Jan
45.0 mm (1.8 in)
7 January 1982
Feb
35.8 mm (1.4 in)
13 February 1982
Mar
27.4 mm (1.1 in)
29 March 1960
Apr
28.6 mm (1.1 in)
28 April 1980
May
31.8 mm (1.3 in)
29 May 1969
Jun
73.1 mm (2.9 in)
29 June 1982
Jul
35.3 mm (1.4 in)
12 July 1972
Aug
36.8 mm (1.4 in)
19 August 1956
Sep
56.4 mm (2.2 in)
4 September 1945
Oct
42.7 mm (1.7 in)
10 October 1940
Nov
36.6 mm (1.4 in)
18 November 1946
Dec
40.0 mm (1.6 in)
3 December 1980
Period of Record Coverage
1940 to 1983
Complete yearUnder 90 percent of days
44 years of record at South Slocan, 1940 to 1983. 2 years have data for under 90 percent of days and are left out of rankings: 1940, 1953.
Cooler than the station meanWarmer than the station mean
One stripe for each of 42 complete years at South Slocan, 1941 to 1983. Blue stripes are years cooler than the station's own mean of 7.8 C (46.0 F); red stripes are warmer. The coolest year was 1955, at 6.1 C (42.9 F), and the warmest was 1941, at 9.6 C (49.3 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at South Slocan as warming stripes, 1941 to 1983
Year
Annual mean temperature
Difference from the station mean
1941
9.6 C
+1.84 C
1942
8.6 C
+0.80 C
1943
7.6 C
-0.24 C
1944
8.7 C
+0.87 C
1945
8.4 C
+0.64 C
1946
8.2 C
+0.36 C
1947
8.6 C
+0.83 C
1948
7.3 C
-0.54 C
1949
7.4 C
-0.41 C
1950
7.3 C
-0.50 C
1951
7.6 C
-0.24 C
1952
8.6 C
+0.77 C
1954
7.8 C
+0.05 C
1955
6.1 C
-1.71 C
1956
7.4 C
-0.36 C
1957
7.4 C
-0.38 C
1958
9.4 C
+1.56 C
1959
7.0 C
-0.76 C
1960
6.9 C
-0.87 C
1961
8.2 C
+0.45 C
1962
7.7 C
-0.09 C
1963
8.4 C
+0.64 C
1964
6.8 C
-0.96 C
1965
7.6 C
-0.23 C
1966
8.0 C
+0.16 C
1967
8.5 C
+0.67 C
1968
7.4 C
-0.38 C
1969
7.7 C
-0.13 C
1970
7.7 C
-0.09 C
1971
7.1 C
-0.70 C
1972
6.8 C
-0.99 C
1973
8.0 C
+0.21 C
1974
8.1 C
+0.30 C
1975
7.0 C
-0.78 C
1976
7.6 C
-0.17 C
1977
7.7 C
-0.07 C
1978
7.4 C
-0.40 C
1979
7.7 C
-0.07 C
1980
8.0 C
+0.20 C
1981
8.4 C
+0.64 C
1982
7.4 C
-0.43 C
1983
8.2 C
+0.45 C
The fitted trend in annual mean temperature here over 1941 to 1983 is -0.13 C (-0.30 to 0.04) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.2 F (-0.5 to 0.1) per decade. The slope is a straight line fitted to 42 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at South Slocan
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.13 C (-0.30 to 0.04) per decade
-0.2 F (-0.5 to 0.1) per decade
1941 to 1983
42
Not clearly different from zero
Mean daily maximum
-0.18 C (-0.39 to 0.02) per decade
-0.33 F (-0.70 to 0.04) per decade
1941 to 1983
42
Not clearly different from zero
Mean daily minimum
-0.1 C (-0.3 to 0.1) per decade
-0.1 F (-0.5 to 0.2) per decade
1941 to 1983
42
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
1940 to 1983
Yearly extremes at South Slocan: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.0 C (104.0 F)
1941
36.7 C (98.1 F)
44
Coldest night (TNn)
-35.0 C (-31.0 F)
1968
-21.8 C (-7.3 F)
44
Wettest day (Rx1day)
73.1 mm (2.9 in)
1982
29.0 mm (1.1 in)
44
Wettest five days (Rx5day)
107.9 mm (4.2 in)
1982
60.5 mm (2.4 in)
44
Longest dry spell (CDD)
52 days
1958
22 days
44
Hottest day (TXx)
The hottest day of the year at South Slocan, 1940 to 1983. The record is 40.0 C (104.0 F) in 1941, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at South Slocan by year
Year
Hottest day (TXx)
1940
17.8 C (64.0 F)
1941
40.0 C (104.0 F)
1942
37.8 C (100.0 F)
1943
36.7 C (98.1 F)
1944
40.0 C (104.0 F)
1945
38.3 C (100.9 F)
1946
38.3 C (100.9 F)
1947
35.6 C (96.1 F)
1948
34.4 C (93.9 F)
1949
37.8 C (100.0 F)
1950
37.8 C (100.0 F)
1951
38.9 C (102.0 F)
1952
37.8 C (100.0 F)
1953
35.6 C (96.1 F)
1954
33.9 C (93.0 F)
1955
33.3 C (91.9 F)
1956
36.1 C (97.0 F)
1957
33.3 C (91.9 F)
1958
37.8 C (100.0 F)
1959
36.7 C (98.1 F)
1960
38.3 C (100.9 F)
1961
39.4 C (102.9 F)
1962
35.6 C (96.1 F)
1963
34.4 C (93.9 F)
1964
33.3 C (91.9 F)
1965
36.1 C (97.0 F)
1966
35.6 C (96.1 F)
1967
39.4 C (102.9 F)
1968
36.1 C (97.0 F)
1969
35.6 C (96.1 F)
1970
38.3 C (100.9 F)
1971
37.8 C (100.0 F)
1972
35.6 C (96.1 F)
1973
37.8 C (100.0 F)
1974
36.7 C (98.1 F)
1975
37.8 C (100.0 F)
1976
35.0 C (95.0 F)
1977
37.8 C (100.0 F)
1978
38.0 C (100.4 F)
1979
38.5 C (101.3 F)
1980
34.0 C (93.2 F)
1981
36.5 C (97.7 F)
1982
34.5 C (94.1 F)
1983
36.0 C (96.8 F)
Coldest night (TNn)
The coldest night of the year at South Slocan, 1940 to 1983. The record is -35.0 C (-31.0 F) in 1968, marked on the chart; the median year is -21.8 C (-7.3 F).
Coldest night (TNn) at South Slocan by year
Year
Coldest night (TNn)
1940
-12.8 C (9.0 F)
1941
-11.1 C (12.0 F)
1942
-19.4 C (-2.9 F)
1943
-28.9 C (-20.0 F)
1944
-17.2 C (1.0 F)
1945
-16.7 C (1.9 F)
1946
-17.8 C (0.0 F)
1947
-21.7 C (-7.1 F)
1948
-21.7 C (-7.1 F)
1949
-23.3 C (-9.9 F)
1950
-31.7 C (-25.1 F)
1951
-25.0 C (-13.0 F)
1952
-25.6 C (-14.1 F)
1953
-11.1 C (12.0 F)
1954
-26.7 C (-16.1 F)
1955
-22.2 C (-8.0 F)
1956
-23.3 C (-9.9 F)
1957
-25.6 C (-14.1 F)
1958
-16.7 C (1.9 F)
1959
-23.9 C (-11.0 F)
1960
-20.6 C (-5.1 F)
1961
-19.4 C (-2.9 F)
1962
-28.3 C (-18.9 F)
1963
-22.2 C (-8.0 F)
1964
-26.7 C (-16.1 F)
1965
-15.6 C (3.9 F)
1966
-20.0 C (-4.0 F)
1967
-17.8 C (0.0 F)
1968
-35.0 C (-31.0 F)
1969
-22.8 C (-9.0 F)
1970
-19.4 C (-2.9 F)
1971
-18.9 C (-2.0 F)
1972
-22.8 C (-9.0 F)
1973
-20.0 C (-4.0 F)
1974
-20.6 C (-5.1 F)
1975
-25.6 C (-14.1 F)
1976
-18.9 C (-2.0 F)
1977
-20.0 C (-4.0 F)
1978
-30.0 C (-22.0 F)
1979
-27.0 C (-16.6 F)
1980
-24.5 C (-12.1 F)
1981
-17.5 C (0.5 F)
1982
-22.0 C (-7.6 F)
1983
-26.0 C (-14.8 F)
Wettest day (Rx1day)
The wettest day of the year at South Slocan, 1940 to 1983. The record is 73.1 mm (2.9 in) in 1982, marked on the chart; the median year is 29.0 mm (1.1 in).
Wettest day (Rx1day) at South Slocan by year
Year
Wettest day (Rx1day)
1940
42.7 mm (1.7 in)
1941
22.9 mm (0.9 in)
1942
26.2 mm (1.0 in)
1943
43.2 mm (1.7 in)
1944
19.8 mm (0.8 in)
1945
56.4 mm (2.2 in)
1946
36.6 mm (1.4 in)
1947
27.4 mm (1.1 in)
1948
34.0 mm (1.3 in)
1949
38.4 mm (1.5 in)
1950
25.4 mm (1.0 in)
1951
31.0 mm (1.2 in)
1952
19.8 mm (0.8 in)
1953
24.1 mm (0.9 in)
1954
27.9 mm (1.1 in)
1955
27.4 mm (1.1 in)
1956
36.8 mm (1.4 in)
1957
31.2 mm (1.2 in)
1958
27.2 mm (1.1 in)
1959
36.1 mm (1.4 in)
1960
32.3 mm (1.3 in)
1961
27.2 mm (1.1 in)
1962
26.9 mm (1.1 in)
1963
24.9 mm (1.0 in)
1964
30.5 mm (1.2 in)
1965
43.2 mm (1.7 in)
1966
24.4 mm (1.0 in)
1967
34.8 mm (1.4 in)
1968
26.7 mm (1.1 in)
1969
31.8 mm (1.3 in)
1970
29.2 mm (1.1 in)
1971
30.7 mm (1.2 in)
1972
35.3 mm (1.4 in)
1973
32.0 mm (1.3 in)
1974
28.7 mm (1.1 in)
1975
31.8 mm (1.3 in)
1976
27.9 mm (1.1 in)
1977
28.4 mm (1.1 in)
1978
24.3 mm (1.0 in)
1979
26.0 mm (1.0 in)
1980
40.0 mm (1.6 in)
1981
24.0 mm (0.9 in)
1982
73.1 mm (2.9 in)
1983
25.0 mm (1.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at South Slocan, 1940 to 1983. The record is 107.9 mm (4.2 in) in 1982, marked on the chart; the median year is 60.5 mm (2.4 in).
Wettest five days (Rx5day) at South Slocan by year
Year
Wettest five days (Rx5day)
1940
53.6 mm (2.1 in)
1941
65.5 mm (2.6 in)
1942
55.2 mm (2.2 in)
1943
66.1 mm (2.6 in)
1944
41.7 mm (1.6 in)
1945
65.5 mm (2.6 in)
1946
66.8 mm (2.6 in)
1947
55.4 mm (2.2 in)
1948
55.5 mm (2.2 in)
1949
58.1 mm (2.3 in)
1950
60.9 mm (2.4 in)
1951
63.8 mm (2.5 in)
1952
55.7 mm (2.2 in)
1953
66.1 mm (2.6 in)
1954
59.8 mm (2.4 in)
1955
58.9 mm (2.3 in)
1956
53.7 mm (2.1 in)
1957
53.3 mm (2.1 in)
1958
52.1 mm (2.1 in)
1959
56.9 mm (2.2 in)
1960
69.9 mm (2.8 in)
1961
49.0 mm (1.9 in)
1962
80.0 mm (3.1 in)
1963
71.1 mm (2.8 in)
1964
77.2 mm (3.0 in)
1965
91.5 mm (3.6 in)
1966
62.5 mm (2.5 in)
1967
58.9 mm (2.3 in)
1968
54.4 mm (2.1 in)
1969
62.6 mm (2.5 in)
1970
60.0 mm (2.4 in)
1971
61.0 mm (2.4 in)
1972
85.7 mm (3.4 in)
1973
59.2 mm (2.3 in)
1974
83.0 mm (3.3 in)
1975
62.9 mm (2.5 in)
1976
47.0 mm (1.9 in)
1977
65.0 mm (2.6 in)
1978
47.4 mm (1.9 in)
1979
51.3 mm (2.0 in)
1980
68.0 mm (2.7 in)
1981
56.8 mm (2.2 in)
1982
107.9 mm (4.2 in)
1983
68.7 mm (2.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at South Slocan, 1940 to 1983. The record is 52 days in 1958, marked on the chart; the median year is 22 days.
Longest dry spell (CDD) at South Slocan by year
Year
Longest dry spell (CDD)
1940
10 days
1941
21 days
1942
18 days
1943
28 days
1944
27 days
1945
38 days
1946
22 days
1947
18 days
1948
29 days
1949
20 days
1950
30 days
1951
34 days
1952
41 days
1953
25 days
1954
24 days
1955
40 days
1956
30 days
1957
34 days
1958
52 days
1959
36 days
1960
29 days
1961
17 days
1962
17 days
1963
17 days
1964
22 days
1965
18 days
1966
21 days
1967
29 days
1968
21 days
1969
33 days
1970
25 days
1971
40 days
1972
17 days
1973
31 days
1974
38 days
1975
16 days
1976
19 days
1977
21 days
1978
16 days
1979
17 days
1980
14 days
1981
20 days
1982
12 days
1983
19 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
42 years with a frost
Across 42 years with a frost, the median last spring frost at South Slocan falls on 12 May and the median first autumn frost on 30 September, which leaves a median of 145 days between them.
Fitted over all years, the growing season changes by -0.1 days per decade at this station.
Frost dates and growing season at South Slocan
Measure
Median, all years
Earliest period
Recent period (1954 to 1983)
Recent against earliest
Fitted trend
Last spring frost
12 May
n/a
12 May
n/a
-1.4 days per decade
First autumn frost
30 September
n/a
1 October
n/a
-1.5 days per decade
Growing days
145 days
n/a
145 days
n/a
-0.1 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, 1941 to 1983
A day with at least 28.9 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 68.6 mm (2.7 in) of rain is expected about once in 100 years.
Rainfall return levels at South Slocan: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
28.9 mm (1.1 in)
5 years
35.9 mm (1.4 in)
10 years
41.7 mm (1.6 in)
25 years
50.8 mm (2.0 in)
50 years
59.0 mm (2.3 in)
Longer than the 43 years of record
100 years
68.6 mm (2.7 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 1941 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: 73.1 mm (2.9 in) in 1982; 56.4 mm (2.2 in) in 1945; 43.2 mm (1.7 in) in 1943.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of South Slocan, at 1955. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1955 ran 0.4 C (0.7 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at South Slocan, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1955
-0.4
-0.7
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 South Slocan standing records by year: CSV or JSON. Field meanings are on the data page.
Data for South Slocan 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.