Record envelope, standing records and threshold days for Grand Forks (CA001133270), British Columbia, Canada, with 68 years of record.
Key Facts for Grand Forks
Grand Forks (CA001133270) is a weather station in British Columbia, Canada at 49.03 latitude and -118.47 longitude, 532 m (1,745 ft) above sea level.
The station reports from 1941 to 2008, 68 years of record.
1,464 records set at Grand Forks still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Grand Forks set a daily record snowfall of 19.0 cm (7.5 in) on 29 December 1983.
About the Station
Location: British Columbia, Canada, 49.03 latitude, -118.47 longitude.
Elevation: 532 m (1,745 ft).
Period of record: 1941 to 2008, 68 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 Grand Forks. 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 Grand Forks, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
16.1 C (61.0 F)
-38.9 C (-38.0 F)
n/a
n/a
Feb
19.4 C (66.9 F)
-34.4 C (-29.9 F)
n/a
n/a
Mar
21.7 C (71.1 F)
-22.8 C (-9.0 F)
n/a
n/a
Apr
31.7 C (89.1 F)
-8.3 C (17.1 F)
n/a
n/a
May
36.1 C (97.0 F)
-8.3 C (17.1 F)
n/a
n/a
Jun
36.1 C (97.0 F)
-1.7 C (28.9 F)
n/a
n/a
Jul
42.2 C (108.0 F)
1.1 C (34.0 F)
n/a
n/a
Aug
39.4 C (102.9 F)
0.0 C (32.0 F)
n/a
n/a
Sep
36.7 C (98.1 F)
-6.1 C (21.0 F)
n/a
n/a
Oct
30.0 C (86.0 F)
-11.1 C (12.0 F)
n/a
n/a
Nov
18.9 C (66.0 F)
-23.3 C (-9.9 F)
n/a
n/a
Dec
17.2 C (63.0 F)
-37.8 C (-36.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Grand Forks still stand. 1955 holds the most, with 71.
Standing records at Grand Forks by the year they were set
Year set
Standing records
1941
40
1942
27
1943
43
1944
44
1945
29
1946
67
1947
35
1948
41
1949
53
1950
61
1951
33
1952
50
1953
45
1954
37
1955
71
1956
41
1957
36
1958
44
1959
23
1960
32
1961
40
1962
33
1963
25
1964
39
1965
22
1966
27
1967
28
1968
28
1969
16
1970
19
1971
24
1972
30
1973
16
1974
21
1975
29
1976
10
1977
22
1978
20
1979
39
1980
22
1981
31
1982
30
1983
41
All-Time Record Progression
1 new records
1 all-time records were set at Grand Forks between 7 July 1975 and 7 July 1975. Each dot is a new record.
When Grand Forks set new all-time records
Date
Kind
Detail
1975-07-07
Record daily precipitation
Record daily precipitation 47.8 mm (1.9 in)
Wettest Day of Each Month
Jul: 47.8 mm (1.9 in)
The wettest day on record for each calendar month at Grand Forks. The most was 47.8 mm (1.9 in) on 7 July 1975.
Record daily precipitation for each month at Grand Forks
Month
Record daily precipitation (mm)
Date
Jan
40.6 mm (1.6 in)
6 January 1962
Feb
25.4 mm (1.0 in)
26 February 1945
Mar
18.0 mm (0.7 in)
17 March 1950
Apr
21.8 mm (0.9 in)
30 April 1948
May
31.2 mm (1.2 in)
24 May 1944
Jun
41.4 mm (1.6 in)
10 June 1948
Jul
47.8 mm (1.9 in)
7 July 1975
Aug
38.4 mm (1.5 in)
21 August 1972
Sep
24.4 mm (1.0 in)
14 September 1959
Oct
27.4 mm (1.1 in)
1 October 1957
Nov
22.6 mm (0.9 in)
21 November 1974
Dec
30.5 mm (1.2 in)
21 December 1967
Period of Record Coverage
1941 to 1983
Complete yearUnder 90 percent of days
43 years of record at Grand Forks, 1941 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1943.
Cooler than the station meanWarmer than the station mean
One stripe for each of 40 complete years at Grand Forks, 1941 to 1983. Blue stripes are years cooler than the station's own mean of 7.3 C (45.1 F); red stripes are warmer. The coolest year was 1955, at 5.5 C (41.8 F), and the warmest was 1958, at 9.1 C (48.3 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Grand Forks as warming stripes, 1941 to 1983
Year
Annual mean temperature
Difference from the station mean
1941
9.0 C
+1.72 C
1942
7.8 C
+0.53 C
1946
7.4 C
+0.10 C
1947
7.5 C
+0.17 C
1948
5.9 C
-1.44 C
1949
6.2 C
-1.06 C
1950
6.2 C
-1.12 C
1951
6.5 C
-0.84 C
1952
7.0 C
-0.28 C
1953
7.1 C
-0.22 C
1954
6.8 C
-0.49 C
1955
5.5 C
-1.84 C
1956
7.0 C
-0.33 C
1957
6.8 C
-0.47 C
1958
9.1 C
+1.75 C
1959
6.8 C
-0.51 C
1960
7.0 C
-0.27 C
1961
8.0 C
+0.66 C
1962
7.4 C
+0.13 C
1963
8.1 C
+0.78 C
1964
6.7 C
-0.65 C
1965
7.6 C
+0.31 C
1966
8.3 C
+0.95 C
1967
8.5 C
+1.15 C
1968
7.2 C
-0.07 C
1969
7.3 C
+0.00 C
1970
7.5 C
+0.15 C
1971
7.0 C
-0.26 C
1972
6.6 C
-0.66 C
1973
8.0 C
+0.68 C
1974
8.0 C
+0.71 C
1975
6.9 C
-0.45 C
1976
7.1 C
-0.25 C
1977
7.1 C
-0.24 C
1978
7.0 C
-0.35 C
1979
7.7 C
+0.36 C
1980
7.8 C
+0.45 C
1981
8.2 C
+0.91 C
1982
6.9 C
-0.44 C
1983
7.9 C
+0.58 C
The fitted trend in annual mean temperature here over 1941 to 1983 is 0.1 C (-0.1 to 0.3) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.2 F (-0.2 to 0.6) per decade. The slope is a straight line fitted to 40 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Grand Forks
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.1 C (-0.1 to 0.3) per decade
0.2 F (-0.2 to 0.6) per decade
1941 to 1983
40
Not clearly different from zero
Mean daily maximum
-0.1 C (-0.4 to 0.1) per decade
-0.3 F (-0.7 to 0.2) per decade
1941 to 1983
40
Not clearly different from zero
Mean daily minimum
0.4 C (0.1 to 0.6) per decade
0.6 F (0.2 to 1.1) per decade
1941 to 1983
40
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
1941 to 1983
Yearly extremes at Grand Forks: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.2 C (108.0 F)
1941
37.2 C (99.0 F)
43
Coldest night (TNn)
-38.9 C (-38.0 F)
1962
-26.1 C (-15.0 F)
43
Wettest day (Rx1day)
47.8 mm (1.9 in)
1975
22.6 mm (0.9 in)
43
Wettest five days (Rx5day)
56.6 mm (2.2 in)
1978
39.8 mm (1.6 in)
43
Longest dry spell (CDD)
50 days
1958
29 days
43
Hottest day (TXx)
The hottest day of the year at Grand Forks, 1941 to 1983. The record is 42.2 C (108.0 F) in 1941, marked on the chart; the median year is 37.2 C (99.0 F).
Hottest day (TXx) at Grand Forks by year
Year
Hottest day (TXx)
1941
42.2 C (108.0 F)
1942
38.3 C (100.9 F)
1943
37.8 C (100.0 F)
1944
38.3 C (100.9 F)
1945
36.7 C (98.1 F)
1946
38.9 C (102.0 F)
1947
37.2 C (99.0 F)
1948
35.0 C (95.0 F)
1949
37.2 C (99.0 F)
1950
36.7 C (98.1 F)
1951
37.8 C (100.0 F)
1952
38.9 C (102.0 F)
1953
36.7 C (98.1 F)
1954
34.4 C (93.9 F)
1955
37.2 C (99.0 F)
1956
36.7 C (98.1 F)
1957
32.8 C (91.0 F)
1958
37.8 C (100.0 F)
1959
38.3 C (100.9 F)
1960
39.4 C (102.9 F)
1961
39.4 C (102.9 F)
1962
36.7 C (98.1 F)
1963
35.0 C (95.0 F)
1964
35.6 C (96.1 F)
1965
36.1 C (97.0 F)
1966
36.1 C (97.0 F)
1967
39.4 C (102.9 F)
1968
36.7 C (98.1 F)
1969
37.2 C (99.0 F)
1970
37.8 C (100.0 F)
1971
38.3 C (100.9 F)
1972
37.2 C (99.0 F)
1973
36.7 C (98.1 F)
1974
35.6 C (96.1 F)
1975
37.8 C (100.0 F)
1976
33.3 C (91.9 F)
1977
37.2 C (99.0 F)
1978
37.0 C (98.6 F)
1979
39.0 C (102.2 F)
1980
36.0 C (96.8 F)
1981
36.0 C (96.8 F)
1982
35.5 C (95.9 F)
1983
35.0 C (95.0 F)
Coldest night (TNn)
The coldest night of the year at Grand Forks, 1941 to 1983. The record is -38.9 C (-38.0 F) in 1962, marked on the chart; the median year is -26.1 C (-15.0 F).
Coldest night (TNn) at Grand Forks by year
Year
Coldest night (TNn)
1941
-15.6 C (3.9 F)
1942
-21.7 C (-7.1 F)
1943
-23.3 C (-9.9 F)
1944
-24.4 C (-11.9 F)
1945
-23.3 C (-9.9 F)
1946
-25.6 C (-14.1 F)
1947
-27.8 C (-18.0 F)
1948
-30.6 C (-23.1 F)
1949
-31.7 C (-25.1 F)
1950
-36.1 C (-33.0 F)
1951
-31.1 C (-24.0 F)
1952
-33.3 C (-27.9 F)
1953
-14.4 C (6.1 F)
1954
-34.4 C (-29.9 F)
1955
-28.3 C (-18.9 F)
1956
-29.4 C (-20.9 F)
1957
-36.1 C (-33.0 F)
1958
-22.2 C (-8.0 F)
1959
-27.8 C (-18.0 F)
1960
-28.9 C (-20.0 F)
1961
-23.9 C (-11.0 F)
1962
-38.9 C (-38.0 F)
1963
-23.3 C (-9.9 F)
1964
-29.4 C (-20.9 F)
1965
-15.6 C (3.9 F)
1966
-21.1 C (-6.0 F)
1967
-20.6 C (-5.1 F)
1968
-37.8 C (-36.0 F)
1969
-35.0 C (-31.0 F)
1970
-21.1 C (-6.0 F)
1971
-25.0 C (-13.0 F)
1972
-26.1 C (-15.0 F)
1973
-24.4 C (-11.9 F)
1974
-26.1 C (-15.0 F)
1975
-25.0 C (-13.0 F)
1976
-21.1 C (-6.0 F)
1977
-23.0 C (-9.4 F)
1978
-34.0 C (-29.2 F)
1979
-33.0 C (-27.4 F)
1980
-29.0 C (-20.2 F)
1981
-20.0 C (-4.0 F)
1982
-28.0 C (-18.4 F)
1983
-32.0 C (-25.6 F)
Wettest day (Rx1day)
The wettest day of the year at Grand Forks, 1941 to 1983. The record is 47.8 mm (1.9 in) in 1975, marked on the chart; the median year is 22.6 mm (0.9 in).
Wettest day (Rx1day) at Grand Forks by year
Year
Wettest day (Rx1day)
1941
21.1 mm (0.8 in)
1942
24.4 mm (1.0 in)
1943
13.0 mm (0.5 in)
1944
31.2 mm (1.2 in)
1945
25.4 mm (1.0 in)
1946
25.4 mm (1.0 in)
1947
21.6 mm (0.9 in)
1948
41.4 mm (1.6 in)
1949
23.6 mm (0.9 in)
1950
18.0 mm (0.7 in)
1951
25.4 mm (1.0 in)
1952
15.2 mm (0.6 in)
1953
19.6 mm (0.8 in)
1954
21.6 mm (0.9 in)
1955
14.5 mm (0.6 in)
1956
11.9 mm (0.5 in)
1957
27.4 mm (1.1 in)
1958
24.1 mm (0.9 in)
1959
24.4 mm (1.0 in)
1960
16.5 mm (0.6 in)
1961
37.1 mm (1.5 in)
1962
40.6 mm (1.6 in)
1963
22.4 mm (0.9 in)
1964
19.6 mm (0.8 in)
1965
22.4 mm (0.9 in)
1966
14.2 mm (0.6 in)
1967
30.5 mm (1.2 in)
1968
17.0 mm (0.7 in)
1969
22.9 mm (0.9 in)
1970
14.0 mm (0.6 in)
1971
26.7 mm (1.1 in)
1972
38.4 mm (1.5 in)
1973
20.6 mm (0.8 in)
1974
22.6 mm (0.9 in)
1975
47.8 mm (1.9 in)
1976
21.8 mm (0.9 in)
1977
15.5 mm (0.6 in)
1978
25.0 mm (1.0 in)
1979
21.2 mm (0.8 in)
1980
24.4 mm (1.0 in)
1981
28.4 mm (1.1 in)
1982
21.0 mm (0.8 in)
1983
29.0 mm (1.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Grand Forks, 1941 to 1983. The record is 56.6 mm (2.2 in) in 1978, marked on the chart; the median year is 39.8 mm (1.6 in).
Wettest five days (Rx5day) at Grand Forks by year
Year
Wettest five days (Rx5day)
1941
46.6 mm (1.8 in)
1942
47.6 mm (1.9 in)
1943
29.0 mm (1.1 in)
1944
38.6 mm (1.5 in)
1945
40.6 mm (1.6 in)
1946
42.7 mm (1.7 in)
1947
36.4 mm (1.4 in)
1948
53.6 mm (2.1 in)
1949
54.8 mm (2.2 in)
1950
37.0 mm (1.5 in)
1951
47.5 mm (1.9 in)
1952
28.1 mm (1.1 in)
1953
37.4 mm (1.5 in)
1954
48.0 mm (1.9 in)
1955
30.5 mm (1.2 in)
1956
30.0 mm (1.2 in)
1957
51.0 mm (2.0 in)
1958
42.6 mm (1.7 in)
1959
50.4 mm (2.0 in)
1960
52.0 mm (2.0 in)
1961
43.7 mm (1.7 in)
1962
45.4 mm (1.8 in)
1963
31.3 mm (1.2 in)
1964
45.7 mm (1.8 in)
1965
30.7 mm (1.2 in)
1966
31.0 mm (1.2 in)
1967
39.2 mm (1.5 in)
1968
42.5 mm (1.7 in)
1969
34.6 mm (1.4 in)
1970
31.8 mm (1.3 in)
1971
34.4 mm (1.4 in)
1972
48.1 mm (1.9 in)
1973
34.0 mm (1.3 in)
1974
35.3 mm (1.4 in)
1975
48.1 mm (1.9 in)
1976
39.0 mm (1.5 in)
1977
25.0 mm (1.0 in)
1978
56.6 mm (2.2 in)
1979
45.4 mm (1.8 in)
1980
48.0 mm (1.9 in)
1981
39.8 mm (1.6 in)
1982
39.5 mm (1.6 in)
1983
39.6 mm (1.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Grand Forks, 1941 to 1983. The record is 50 days in 1958, marked on the chart; the median year is 29 days.
Longest dry spell (CDD) at Grand Forks by year
Year
Longest dry spell (CDD)
1941
15 days
1942
31 days
1943
30 days
1944
29 days
1945
48 days
1946
30 days
1947
16 days
1948
23 days
1949
21 days
1950
31 days
1951
33 days
1952
49 days
1953
25 days
1954
24 days
1955
44 days
1956
29 days
1957
45 days
1958
50 days
1959
40 days
1960
30 days
1961
17 days
1962
19 days
1963
25 days
1964
22 days
1965
37 days
1966
23 days
1967
29 days
1968
15 days
1969
29 days
1970
31 days
1971
41 days
1972
24 days
1973
32 days
1974
46 days
1975
20 days
1976
20 days
1977
20 days
1978
23 days
1979
34 days
1980
22 days
1981
20 days
1982
17 days
1983
35 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
40 years with a frost
Across 40 years with a frost, the median last spring frost at Grand Forks falls on 13 May and the median first autumn frost on 20 September, which leaves a median of 134 days between them.
Fitted over all years, the growing season changes by +11.4 days per decade at this station.
Frost dates and growing season at Grand Forks
Measure
Median, all years
Earliest period
Recent period (1954 to 1983)
Recent against earliest
Fitted trend
Last spring frost
13 May
n/a
9 May
n/a
-7.9 days per decade
First autumn frost
20 September
n/a
20 September
n/a
+3.5 days per decade
Growing days
134 days
n/a
139 days
n/a
+11.4 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 22.5 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 49.8 mm (2.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Grand Forks: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
22.5 mm (0.9 in)
5 years
29.5 mm (1.2 in)
10 years
34.2 mm (1.3 in)
25 years
40.4 mm (1.6 in)
50 years
45.0 mm (1.8 in)
Longer than the 43 years of record
100 years
49.8 mm (2.0 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: 47.8 mm (1.9 in) in 1975; 41.4 mm (1.6 in) in 1948; 40.6 mm (1.6 in) in 1962.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Grand Forks standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Grand Forks 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.