Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Gravenhurst. 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 Gravenhurst, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
10.6 C (51.1 F)
-44.4 C (-47.9 F)
n/a
n/a
Feb
11.1 C (52.0 F)
-41.7 C (-43.1 F)
n/a
n/a
Mar
21.1 C (70.0 F)
-33.3 C (-27.9 F)
n/a
n/a
Apr
29.4 C (84.9 F)
-21.7 C (-7.1 F)
n/a
n/a
May
35.0 C (95.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jun
34.4 C (93.9 F)
-3.3 C (26.1 F)
n/a
n/a
Jul
36.7 C (98.1 F)
0.6 C (33.1 F)
n/a
n/a
Aug
35.6 C (96.1 F)
-0.6 C (30.9 F)
n/a
n/a
Sep
34.4 C (93.9 F)
-6.1 C (21.0 F)
n/a
n/a
Oct
28.9 C (84.0 F)
-10.6 C (12.9 F)
n/a
n/a
Nov
20.0 C (68.0 F)
-28.3 C (-18.9 F)
n/a
n/a
Dec
13.3 C (55.9 F)
-38.9 C (-38.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Gravenhurst still stand. 1879 holds the most, with 49.
Standing records at Gravenhurst by the year they were set
Year set
Standing records
1875
36
1876
47
1877
39
1878
32
1879
49
1880
39
1881
36
1882
25
1883
33
1884
42
1885
43
1886
34
1887
29
1888
35
1889
25
1890
39
1891
37
1892
23
1893
19
1894
43
1895
37
1896
39
1897
24
1898
31
1899
38
1900
42
1901
18
1902
29
1903
29
1904
28
1905
18
1906
37
1907
25
1908
18
1909
23
1910
24
1911
26
1912
42
1913
38
1914
37
1915
24
1916
13
1918
26
1919
33
1920
40
1921
20
All-Time Record Progression
8 new records
8 all-time records were set at Gravenhurst between 23 February 1907 and 1 February 1949. Each dot is a new record.
When Gravenhurst set new all-time records
Date
Kind
Detail
1907-02-23
Record low minimum temperature
Record low minimum temperature -41.7 C (-43.1 F)
1908-01-30
Record low minimum temperature
Record low minimum temperature -44.4 C (-47.9 F)
1910-02-12
Record daily snowfall
Record daily snowfall 38.1 cm (15.0 in)
1911-07-09
Record high maximum temperature
Record high maximum temperature 36.7 C (98.1 F)
1912-01-11
Record low maximum temperature
Record low maximum temperature -27.8 C (-18.0 F)
1914-01-13
Record low maximum temperature
Record low maximum temperature -28.3 C (-18.9 F)
1914-06-09
Record high minimum temperature
Record high minimum temperature 24.4 C (75.9 F)
1949-02-01
Record daily snowfall
Record daily snowfall 52.1 cm (20.5 in)
Wettest Day of Each Month
Sep: 118.4 mm (4.7 in)
The wettest day on record for each calendar month at Gravenhurst. The most was 118.4 mm (4.7 in) on 13 September 1878.
Record daily precipitation for each month at Gravenhurst
Month
Record daily precipitation (mm)
Date
Jan
36.6 mm (1.4 in)
1 January 1891
Feb
52.1 mm (2.1 in)
1 February 1949
Mar
32.8 mm (1.3 in)
21 March 1886
Apr
29.7 mm (1.2 in)
19 April 1909
May
67.3 mm (2.6 in)
30 May 1908
Jun
73.2 mm (2.9 in)
22 June 1907
Jul
66.0 mm (2.6 in)
5 July 1899
Aug
71.4 mm (2.8 in)
8 August 1892
Sep
118.4 mm (4.7 in)
13 September 1878
Oct
49.5 mm (1.9 in)
14 October 1893
Nov
46.5 mm (1.8 in)
9 November 1870
Dec
38.6 mm (1.5 in)
4 December 1887
Period of Record Coverage
1875 to 1921
Complete yearUnder 90 percent of days
46 years of record at Gravenhurst, 1875 to 1921. 3 years have data for under 90 percent of days and are left out of rankings: 1875, 1916, 1921.
Cooler than the station meanWarmer than the station mean
One stripe for each of 41 complete years at Gravenhurst, 1876 to 1920. Blue stripes are years cooler than the station's own mean of 5.2 C (41.4 F); red stripes are warmer. The coolest year was 1885, at 3.4 C (38.1 F), and the warmest was 1878, at 6.8 C (44.2 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Gravenhurst as warming stripes, 1876 to 1920
Year
Annual mean temperature
Difference from the station mean
1876
4.4 C
-0.82 C
1877
5.8 C
+0.63 C
1878
6.8 C
+1.56 C
1879
4.5 C
-0.74 C
1880
5.6 C
+0.38 C
1881
6.0 C
+0.75 C
1882
5.5 C
+0.31 C
1883
3.7 C
-1.48 C
1884
5.1 C
-0.11 C
1885
3.4 C
-1.81 C
1886
4.9 C
-0.35 C
1887
5.2 C
+0.04 C
1888
4.2 C
-1.01 C
1889
5.9 C
+0.67 C
1890
5.7 C
+0.47 C
1891
6.3 C
+1.09 C
1892
5.2 C
+0.03 C
1893
4.5 C
-0.75 C
1894
6.4 C
+1.21 C
1895
5.2 C
+0.04 C
1896
5.4 C
+0.19 C
1897
5.7 C
+0.51 C
1898
6.8 C
+1.55 C
1899
5.3 C
+0.07 C
1900
6.0 C
+0.82 C
1901
5.7 C
+0.52 C
1902
5.7 C
+0.48 C
1903
5.6 C
+0.42 C
1904
3.4 C
-1.76 C
1905
4.6 C
-0.60 C
1906
5.6 C
+0.39 C
1907
4.0 C
-1.21 C
1908
5.1 C
-0.12 C
1909
4.7 C
-0.50 C
1910
4.8 C
-0.41 C
1911
5.3 C
+0.05 C
1912
3.6 C
-1.64 C
1913
5.8 C
+0.55 C
1914
4.5 C
-0.73 C
1919
6.3 C
+1.09 C
1920
5.3 C
+0.09 C
The fitted trend in annual mean temperature here over 1876 to 1920 is -0.04 C (-0.26 to 0.19) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.5 to 0.3) per decade. The slope is a straight line fitted to 41 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Gravenhurst
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.04 C (-0.26 to 0.19) per decade
-0.1 F (-0.5 to 0.3) per decade
1876 to 1920
41
Not clearly different from zero
Mean daily maximum
0.1 C (-0.1 to 0.3) per decade
0.2 F (-0.2 to 0.6) per decade
1876 to 1920
41
Not clearly different from zero
Mean daily minimum
-0.2 C (-0.4 to 0.1) per decade
-0.3 F (-0.8 to 0.2) per decade
1876 to 1920
41
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
1870 to 1949
Yearly extremes at Gravenhurst: 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)
1911
33.3 C (91.9 F)
46
Coldest night (TNn)
-44.4 C (-47.9 F)
1908
-35.0 C (-31.0 F)
46
Wettest day (Rx1day)
118.4 mm (4.7 in)
1878
46.7 mm (1.8 in)
53
Wettest five days (Rx5day)
175.3 mm (6.9 in)
1878
69.7 mm (2.7 in)
53
Longest dry spell (CDD)
35 days
1881
16 days
53
Hottest day (TXx)
The hottest day of the year at Gravenhurst, 1870 to 1949. The record is 36.7 C (98.1 F) in 1911, marked on the chart; the median year is 33.3 C (91.9 F).
Hottest day (TXx) at Gravenhurst by year
Year
Hottest day (TXx)
1870
n/a
1871
n/a
1872
n/a
1873
n/a
1874
n/a
1875
31.1 C (88.0 F)
1876
33.3 C (91.9 F)
1877
32.8 C (91.0 F)
1878
33.9 C (93.0 F)
1879
31.7 C (89.1 F)
1880
31.7 C (89.1 F)
1881
35.0 C (95.0 F)
1882
32.8 C (91.0 F)
1883
30.6 C (87.1 F)
1884
33.3 C (91.9 F)
1885
30.6 C (87.1 F)
1886
32.8 C (91.0 F)
1887
33.9 C (93.0 F)
1888
34.4 C (93.9 F)
1889
32.8 C (91.0 F)
1890
33.3 C (91.9 F)
1891
33.9 C (93.0 F)
1892
35.0 C (95.0 F)
1893
32.2 C (90.0 F)
1894
34.4 C (93.9 F)
1895
33.3 C (91.9 F)
1896
32.2 C (90.0 F)
1897
36.1 C (97.0 F)
1898
34.4 C (93.9 F)
1899
35.0 C (95.0 F)
1900
33.3 C (91.9 F)
1901
35.0 C (95.0 F)
1902
29.4 C (84.9 F)
1903
33.3 C (91.9 F)
1904
31.1 C (88.0 F)
1905
30.6 C (87.1 F)
1906
32.2 C (90.0 F)
1907
31.7 C (89.1 F)
1908
32.8 C (91.0 F)
1909
30.6 C (87.1 F)
1910
31.7 C (89.1 F)
1911
36.7 C (98.1 F)
1912
33.3 C (91.9 F)
1913
33.9 C (93.0 F)
1914
35.0 C (95.0 F)
1915
30.6 C (87.1 F)
1916
20.6 C (69.1 F)
1918
35.6 C (96.1 F)
1919
34.4 C (93.9 F)
1920
32.2 C (90.0 F)
1921
35.0 C (95.0 F)
1948
n/a
1949
n/a
Coldest night (TNn)
The coldest night of the year at Gravenhurst, 1870 to 1949. The record is -44.4 C (-47.9 F) in 1908, marked on the chart; the median year is -35.0 C (-31.0 F).
Coldest night (TNn) at Gravenhurst by year
Year
Coldest night (TNn)
1870
n/a
1871
n/a
1872
n/a
1873
n/a
1874
n/a
1875
-35.6 C (-32.1 F)
1876
-32.8 C (-27.0 F)
1877
-32.8 C (-27.0 F)
1878
-28.9 C (-20.0 F)
1879
-34.4 C (-29.9 F)
1880
-26.1 C (-15.0 F)
1881
-35.0 C (-31.0 F)
1882
-35.6 C (-32.1 F)
1883
-34.4 C (-29.9 F)
1884
-38.9 C (-38.0 F)
1885
-35.6 C (-32.1 F)
1886
-37.8 C (-36.0 F)
1887
-35.0 C (-31.0 F)
1888
-33.9 C (-29.0 F)
1889
-34.4 C (-29.9 F)
1890
-28.3 C (-18.9 F)
1891
-30.6 C (-23.1 F)
1892
-34.4 C (-29.9 F)
1893
-34.4 C (-29.9 F)
1894
-35.6 C (-32.1 F)
1895
-35.6 C (-32.1 F)
1896
-37.8 C (-36.0 F)
1897
-33.3 C (-27.9 F)
1898
-35.0 C (-31.0 F)
1899
-38.9 C (-38.0 F)
1900
-38.3 C (-36.9 F)
1901
-33.3 C (-27.9 F)
1902
-28.3 C (-18.9 F)
1903
-31.1 C (-24.0 F)
1904
-36.7 C (-34.1 F)
1905
-36.1 C (-33.0 F)
1906
-35.6 C (-32.1 F)
1907
-41.7 C (-43.1 F)
1908
-44.4 C (-47.9 F)
1909
-30.0 C (-22.0 F)
1910
-36.1 C (-33.0 F)
1911
-32.8 C (-27.0 F)
1912
-44.4 C (-47.9 F)
1913
-38.3 C (-36.9 F)
1914
-41.1 C (-42.0 F)
1915
-36.7 C (-34.1 F)
1916
-35.0 C (-31.0 F)
1918
-36.7 C (-34.1 F)
1919
-34.4 C (-29.9 F)
1920
-36.7 C (-34.1 F)
1921
-34.4 C (-29.9 F)
1948
n/a
1949
n/a
Wettest day (Rx1day)
The wettest day of the year at Gravenhurst, 1870 to 1949. The record is 118.4 mm (4.7 in) in 1878, marked on the chart; the median year is 46.7 mm (1.8 in).
Wettest day (Rx1day) at Gravenhurst by year
Year
Wettest day (Rx1day)
1870
46.5 mm (1.8 in)
1871
34.8 mm (1.4 in)
1872
42.9 mm (1.7 in)
1873
48.3 mm (1.9 in)
1874
34.5 mm (1.4 in)
1875
68.3 mm (2.7 in)
1876
33.8 mm (1.3 in)
1877
39.1 mm (1.5 in)
1878
118.4 mm (4.7 in)
1879
43.2 mm (1.7 in)
1880
52.3 mm (2.1 in)
1881
48.5 mm (1.9 in)
1882
53.3 mm (2.1 in)
1883
49.5 mm (1.9 in)
1884
45.7 mm (1.8 in)
1885
53.1 mm (2.1 in)
1886
34.0 mm (1.3 in)
1887
50.8 mm (2.0 in)
1888
46.2 mm (1.8 in)
1889
38.1 mm (1.5 in)
1890
31.8 mm (1.3 in)
1891
40.1 mm (1.6 in)
1892
71.4 mm (2.8 in)
1893
49.5 mm (1.9 in)
1894
40.9 mm (1.6 in)
1895
54.9 mm (2.2 in)
1896
53.1 mm (2.1 in)
1897
50.8 mm (2.0 in)
1898
41.1 mm (1.6 in)
1899
66.0 mm (2.6 in)
1900
31.2 mm (1.2 in)
1901
53.8 mm (2.1 in)
1902
31.8 mm (1.3 in)
1903
27.7 mm (1.1 in)
1904
30.0 mm (1.2 in)
1905
42.9 mm (1.7 in)
1906
55.9 mm (2.2 in)
1907
73.2 mm (2.9 in)
1908
67.3 mm (2.6 in)
1909
36.3 mm (1.4 in)
1910
48.3 mm (1.9 in)
1911
54.4 mm (2.1 in)
1912
30.2 mm (1.2 in)
1913
38.1 mm (1.5 in)
1914
26.9 mm (1.1 in)
1915
50.3 mm (2.0 in)
1916
25.9 mm (1.0 in)
1918
46.7 mm (1.8 in)
1919
46.7 mm (1.8 in)
1920
69.9 mm (2.8 in)
1921
23.1 mm (0.9 in)
1948
48.8 mm (1.9 in)
1949
61.7 mm (2.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Gravenhurst, 1870 to 1949. The record is 175.3 mm (6.9 in) in 1878, marked on the chart; the median year is 69.7 mm (2.7 in).
Wettest five days (Rx5day) at Gravenhurst by year
Year
Wettest five days (Rx5day)
1870
53.3 mm (2.1 in)
1871
48.3 mm (1.9 in)
1872
51.0 mm (2.0 in)
1873
66.8 mm (2.6 in)
1874
72.6 mm (2.9 in)
1875
71.3 mm (2.8 in)
1876
72.4 mm (2.9 in)
1877
65.1 mm (2.6 in)
1878
175.3 mm (6.9 in)
1879
56.9 mm (2.2 in)
1880
76.2 mm (3.0 in)
1881
84.0 mm (3.3 in)
1882
57.1 mm (2.2 in)
1883
70.8 mm (2.8 in)
1884
64.1 mm (2.5 in)
1885
53.6 mm (2.1 in)
1886
64.2 mm (2.5 in)
1887
96.6 mm (3.8 in)
1888
66.8 mm (2.6 in)
1889
79.7 mm (3.1 in)
1890
42.0 mm (1.7 in)
1891
62.0 mm (2.4 in)
1892
131.5 mm (5.2 in)
1893
59.2 mm (2.3 in)
1894
77.5 mm (3.1 in)
1895
57.9 mm (2.3 in)
1896
116.3 mm (4.6 in)
1897
84.3 mm (3.3 in)
1898
56.6 mm (2.2 in)
1899
88.1 mm (3.5 in)
1900
69.7 mm (2.7 in)
1901
74.1 mm (2.9 in)
1902
60.2 mm (2.4 in)
1903
73.9 mm (2.9 in)
1904
46.5 mm (1.8 in)
1905
71.9 mm (2.8 in)
1906
91.9 mm (3.6 in)
1907
108.2 mm (4.3 in)
1908
86.6 mm (3.4 in)
1909
77.2 mm (3.0 in)
1910
57.5 mm (2.3 in)
1911
59.2 mm (2.3 in)
1912
49.8 mm (2.0 in)
1913
58.9 mm (2.3 in)
1914
53.8 mm (2.1 in)
1915
108.4 mm (4.3 in)
1916
50.3 mm (2.0 in)
1918
70.1 mm (2.8 in)
1919
82.6 mm (3.3 in)
1920
70.9 mm (2.8 in)
1921
30.5 mm (1.2 in)
1948
58.2 mm (2.3 in)
1949
81.0 mm (3.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Gravenhurst, 1870 to 1949. The record is 35 days in 1881, marked on the chart; the median year is 16 days.
Longest dry spell (CDD) at Gravenhurst by year
Year
Longest dry spell (CDD)
1870
12 days
1871
20 days
1872
18 days
1873
13 days
1874
24 days
1875
14 days
1876
14 days
1877
16 days
1878
13 days
1879
20 days
1880
15 days
1881
35 days
1882
12 days
1883
11 days
1884
21 days
1885
14 days
1886
18 days
1887
26 days
1888
33 days
1889
26 days
1890
14 days
1891
26 days
1892
15 days
1893
11 days
1894
12 days
1895
13 days
1896
12 days
1897
14 days
1898
15 days
1899
13 days
1900
15 days
1901
17 days
1902
15 days
1903
20 days
1904
23 days
1905
14 days
1906
16 days
1907
16 days
1908
29 days
1909
16 days
1910
25 days
1911
16 days
1912
17 days
1913
13 days
1914
17 days
1915
19 days
1916
13 days
1918
17 days
1919
17 days
1920
21 days
1921
14 days
1948
14 days
1949
24 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
41 years with a frost
Across 41 years with a frost, the median last spring frost at Gravenhurst falls on 21 May and the median first autumn frost on 28 September, which leaves a median of 128 days between them.
Fitted over all years, the growing season changes by -1.1 days per decade at this station.
Frost dates and growing season at Gravenhurst
Measure
Median, all years
Earliest period
Recent period (1887 to 1920)
Recent against earliest
Fitted trend
Last spring frost
21 May
n/a
20 May
n/a
-1.1 days per decade
First autumn frost
28 September
n/a
26 September
n/a
-2.2 days per decade
Growing days
128 days
n/a
129 days
n/a
-1.1 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
46 years, 1871 to 1920
A day with at least 45.5 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 98.5 mm (3.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Gravenhurst: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
45.5 mm (1.8 in)
5 years
58.8 mm (2.3 in)
10 years
67.9 mm (2.7 in)
25 years
79.9 mm (3.1 in)
50 years
89.1 mm (3.5 in)
Longer than the 46 years of record
100 years
98.5 mm (3.9 in)
Longer than the 46 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, 46 years of values from 1871 to 1920.
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: 118.4 mm (4.7 in) in 1878; 73.2 mm (2.9 in) in 1907; 71.4 mm (2.8 in) in 1892.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Gravenhurst standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Gravenhurst 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.