Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Granby. 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 Granby, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
14.4 C (57.9 F)
-37.0 C (-34.6 F)
n/a
n/a
Feb
16.5 C (61.7 F)
-35.0 C (-31.0 F)
n/a
n/a
Mar
23.9 C (75.0 F)
-31.1 C (-24.0 F)
n/a
n/a
Apr
28.3 C (82.9 F)
-17.2 C (1.0 F)
n/a
n/a
May
31.1 C (88.0 F)
-5.0 C (23.0 F)
n/a
n/a
Jun
34.4 C (93.9 F)
1.5 C (34.7 F)
n/a
n/a
Jul
36.1 C (97.0 F)
1.7 C (35.1 F)
n/a
n/a
Aug
35.6 C (96.1 F)
2.8 C (37.0 F)
n/a
n/a
Sep
32.2 C (90.0 F)
-3.0 C (26.6 F)
n/a
n/a
Oct
28.9 C (84.0 F)
-8.9 C (16.0 F)
n/a
n/a
Nov
23.9 C (75.0 F)
-18.9 C (-2.0 F)
n/a
n/a
Dec
17.2 C (63.0 F)
-33.0 C (-27.4 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Granby still stand. 1979 holds the most, with 88.
Standing records at Granby by the year they were set
Year set
Standing records
1948
39
1949
86
1950
63
1951
50
1952
20
1953
62
1954
39
1955
47
1963
28
1964
60
1965
39
1966
48
1967
43
1968
58
1969
40
1970
43
1971
41
1972
37
1973
49
1974
48
1975
47
1976
68
1977
53
1978
45
1979
88
1980
48
1981
68
1982
66
1983
41
Wettest Day of Each Month
Aug: 117.3 mm (4.6 in)
The wettest day on record for each calendar month at Granby. The most was 117.3 mm (4.6 in) on 7 August 1972.
Record daily precipitation for each month at Granby
Month
Record daily precipitation (mm)
Date
Jan
43.2 mm (1.7 in)
26 January 1965
Feb
43.7 mm (1.7 in)
19 February 1972
Mar
47.8 mm (1.9 in)
26 March 1978
Apr
40.4 mm (1.6 in)
17 April 1982
May
63.5 mm (2.5 in)
15 May 1960
Jun
63.8 mm (2.5 in)
19 June 1978
Jul
80.8 mm (3.2 in)
7 July 1976
Aug
117.3 mm (4.6 in)
7 August 1972
Sep
62.2 mm (2.4 in)
2 September 1975
Oct
61.0 mm (2.4 in)
27 October 1981
Nov
36.4 mm (1.4 in)
11 November 1983
Dec
48.8 mm (1.9 in)
12 December 1983
Period of Record Coverage
1948 to 1983
Complete yearUnder 90 percent of days
29 years of record at Granby, 1948 to 1983. 3 years have data for under 90 percent of days and are left out of rankings: 1948, 1963, 1965.
Cooler than the station meanWarmer than the station mean
One stripe for each of 21 complete years at Granby, 1949 to 1983. Blue stripes are years cooler than the station's own mean of 6.0 C (42.9 F); red stripes are warmer. The coolest year was 1972, at 5.0 C (41.0 F), and the warmest was 1953, at 7.7 C (45.9 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Granby as warming stripes, 1949 to 1983
Year
Annual mean temperature
Difference from the station mean
1949
7.7 C
+1.62 C
1950
6.3 C
+0.22 C
1951
6.4 C
+0.40 C
1953
7.7 C
+1.68 C
1964
6.0 C
-0.04 C
1968
5.5 C
-0.58 C
1969
5.9 C
-0.12 C
1970
5.5 C
-0.54 C
1971
5.8 C
-0.24 C
1972
5.0 C
-1.04 C
1973
6.7 C
+0.67 C
1974
5.6 C
-0.45 C
1975
6.8 C
+0.74 C
1976
5.1 C
-0.92 C
1977
6.1 C
+0.10 C
1978
5.0 C
-1.03 C
1979
6.4 C
+0.37 C
1980
5.2 C
-0.87 C
1981
6.4 C
+0.32 C
1982
5.7 C
-0.34 C
1983
6.1 C
+0.08 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
1948 to 1983
Yearly extremes at Granby: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.1 C (97.0 F)
1949
31.7 C (89.1 F)
29
Coldest night (TNn)
-37.0 C (-34.6 F)
1981
-30.0 C (-22.0 F)
29
Wettest day (Rx1day)
117.3 mm (4.6 in)
1972
47.4 mm (1.9 in)
36
Wettest five days (Rx5day)
143.5 mm (5.6 in)
1972
76.6 mm (3.0 in)
36
Longest dry spell (CDD)
21 days
1953
12 days
36
Hottest day (TXx)
The hottest day of the year at Granby, 1948 to 1983. The record is 36.1 C (97.0 F) in 1949, marked on the chart; the median year is 31.7 C (89.1 F).
Hottest day (TXx) at Granby by year
Year
Hottest day (TXx)
1948
35.6 C (96.1 F)
1949
36.1 C (97.0 F)
1950
31.7 C (89.1 F)
1951
30.6 C (87.1 F)
1952
33.9 C (93.0 F)
1953
35.0 C (95.0 F)
1954
31.1 C (88.0 F)
1955
34.4 C (93.9 F)
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
n/a
1961
n/a
1962
n/a
1963
25.0 C (77.0 F)
1964
33.9 C (93.0 F)
1965
31.7 C (89.1 F)
1966
32.2 C (90.0 F)
1967
32.8 C (91.0 F)
1968
31.7 C (89.1 F)
1969
31.1 C (88.0 F)
1970
31.7 C (89.1 F)
1971
32.2 C (90.0 F)
1972
30.6 C (87.1 F)
1973
31.7 C (89.1 F)
1974
29.4 C (84.9 F)
1975
34.4 C (93.9 F)
1976
32.8 C (91.0 F)
1977
31.7 C (89.1 F)
1978
31.1 C (88.0 F)
1979
31.7 C (89.1 F)
1980
30.5 C (86.9 F)
1981
31.5 C (88.7 F)
1982
32.5 C (90.5 F)
1983
34.0 C (93.2 F)
Coldest night (TNn)
The coldest night of the year at Granby, 1948 to 1983. The record is -37.0 C (-34.6 F) in 1981, marked on the chart; the median year is -30.0 C (-22.0 F).
Coldest night (TNn) at Granby by year
Year
Coldest night (TNn)
1948
-25.0 C (-13.0 F)
1949
-21.1 C (-6.0 F)
1950
-31.1 C (-24.0 F)
1951
-30.6 C (-23.1 F)
1952
-28.9 C (-20.0 F)
1953
-30.0 C (-22.0 F)
1954
-31.7 C (-25.1 F)
1955
-29.4 C (-20.9 F)
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
n/a
1961
n/a
1962
n/a
1963
-25.0 C (-13.0 F)
1964
-23.9 C (-11.0 F)
1965
-33.3 C (-27.9 F)
1966
-28.3 C (-18.9 F)
1967
-30.0 C (-22.0 F)
1968
-34.4 C (-29.9 F)
1969
-22.8 C (-9.0 F)
1970
-27.8 C (-18.0 F)
1971
-30.0 C (-22.0 F)
1972
-30.0 C (-22.0 F)
1973
-30.0 C (-22.0 F)
1974
-29.4 C (-20.9 F)
1975
-29.4 C (-20.9 F)
1976
-31.7 C (-25.1 F)
1977
-27.2 C (-17.0 F)
1978
-31.7 C (-25.1 F)
1979
-35.0 C (-31.0 F)
1980
-33.0 C (-27.4 F)
1981
-37.0 C (-34.6 F)
1982
-31.0 C (-23.8 F)
1983
-28.5 C (-19.3 F)
Wettest day (Rx1day)
The wettest day of the year at Granby, 1948 to 1983. The record is 117.3 mm (4.6 in) in 1972, marked on the chart; the median year is 47.4 mm (1.9 in).
Wettest day (Rx1day) at Granby by year
Year
Wettest day (Rx1day)
1948
25.4 mm (1.0 in)
1949
44.5 mm (1.8 in)
1950
35.1 mm (1.4 in)
1951
39.1 mm (1.5 in)
1952
47.0 mm (1.9 in)
1953
59.7 mm (2.4 in)
1954
54.1 mm (2.1 in)
1955
45.2 mm (1.8 in)
1956
34.5 mm (1.4 in)
1957
37.3 mm (1.5 in)
1958
67.1 mm (2.6 in)
1959
46.5 mm (1.8 in)
1960
63.5 mm (2.5 in)
1961
51.1 mm (2.0 in)
1962
43.2 mm (1.7 in)
1963
47.8 mm (1.9 in)
1964
43.9 mm (1.7 in)
1965
48.3 mm (1.9 in)
1966
33.0 mm (1.3 in)
1967
46.0 mm (1.8 in)
1968
35.8 mm (1.4 in)
1969
51.3 mm (2.0 in)
1970
66.3 mm (2.6 in)
1971
51.6 mm (2.0 in)
1972
117.3 mm (4.6 in)
1973
35.8 mm (1.4 in)
1974
39.6 mm (1.6 in)
1975
62.2 mm (2.4 in)
1976
80.8 mm (3.2 in)
1977
43.4 mm (1.7 in)
1978
63.8 mm (2.5 in)
1979
46.7 mm (1.8 in)
1980
53.9 mm (2.1 in)
1981
72.0 mm (2.8 in)
1982
76.4 mm (3.0 in)
1983
48.8 mm (1.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Granby, 1948 to 1983. The record is 143.5 mm (5.6 in) in 1972, marked on the chart; the median year is 76.6 mm (3.0 in).
Wettest five days (Rx5day) at Granby by year
Year
Wettest five days (Rx5day)
1948
35.5 mm (1.4 in)
1949
77.0 mm (3.0 in)
1950
51.4 mm (2.0 in)
1951
72.1 mm (2.8 in)
1952
68.1 mm (2.7 in)
1953
81.8 mm (3.2 in)
1954
68.1 mm (2.7 in)
1955
76.2 mm (3.0 in)
1956
58.6 mm (2.3 in)
1957
58.4 mm (2.3 in)
1958
86.7 mm (3.4 in)
1959
79.0 mm (3.1 in)
1960
73.9 mm (2.9 in)
1961
78.5 mm (3.1 in)
1962
64.9 mm (2.6 in)
1963
75.3 mm (3.0 in)
1964
70.6 mm (2.8 in)
1965
95.0 mm (3.7 in)
1966
53.8 mm (2.1 in)
1967
60.2 mm (2.4 in)
1968
56.7 mm (2.2 in)
1969
86.9 mm (3.4 in)
1970
73.4 mm (2.9 in)
1971
72.6 mm (2.9 in)
1972
143.5 mm (5.6 in)
1973
71.9 mm (2.8 in)
1974
83.0 mm (3.3 in)
1975
81.5 mm (3.2 in)
1976
85.7 mm (3.4 in)
1977
79.7 mm (3.1 in)
1978
106.0 mm (4.2 in)
1979
83.6 mm (3.3 in)
1980
105.4 mm (4.1 in)
1981
103.2 mm (4.1 in)
1982
81.6 mm (3.2 in)
1983
110.6 mm (4.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Granby, 1948 to 1983. The record is 21 days in 1953, marked on the chart; the median year is 12 days.
Longest dry spell (CDD) at Granby by year
Year
Longest dry spell (CDD)
1948
13 days
1949
11 days
1950
13 days
1951
15 days
1952
11 days
1953
21 days
1954
13 days
1955
10 days
1956
13 days
1957
16 days
1958
12 days
1959
11 days
1960
12 days
1961
16 days
1962
11 days
1963
19 days
1964
15 days
1965
19 days
1966
13 days
1967
17 days
1968
15 days
1969
10 days
1970
12 days
1971
12 days
1972
13 days
1973
13 days
1974
12 days
1975
12 days
1976
11 days
1977
12 days
1978
11 days
1979
12 days
1980
11 days
1981
8 days
1982
14 days
1983
12 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
21 years with a frost
Across 21 years with a frost, the median last spring frost at Granby falls on 7 May and the median first autumn frost on 3 October, which leaves a median of 151 days between them.
Frost dates and growing season at Granby
Measure
Median, all years
Earliest period
Recent period (1949 to 1983)
Recent against earliest
Fitted trend
Last spring frost
7 May
n/a
7 May
n/a
n/a
First autumn frost
3 October
n/a
3 October
n/a
n/a
Growing days
151 days
n/a
151 days
n/a
n/a
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
35 years, 1949 to 1983
A day with at least 48.2 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 116.5 mm (4.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Granby: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
48.2 mm (1.9 in)
5 years
61.8 mm (2.4 in)
10 years
72.4 mm (2.9 in)
25 years
88.0 mm (3.5 in)
50 years
101.4 mm (4.0 in)
Longer than the 35 years of record
100 years
116.5 mm (4.6 in)
Longer than the 35 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, 35 years of values from 1949 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: 117.3 mm (4.6 in) in 1972; 80.8 mm (3.2 in) in 1976; 76.4 mm (3.0 in) in 1982.
Download the Data
Data for Granby standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Granby 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.