Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Orillia. 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 Orillia, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
15.6 C (60.1 F)
-36.1 C (-33.0 F)
n/a
n/a
Feb
10.6 C (51.1 F)
-35.6 C (-32.1 F)
n/a
n/a
Mar
25.6 C (78.1 F)
-32.8 C (-27.0 F)
n/a
n/a
Apr
29.4 C (84.9 F)
-21.1 C (-6.0 F)
n/a
n/a
May
33.3 C (91.9 F)
-5.6 C (21.9 F)
n/a
n/a
Jun
36.7 C (98.1 F)
0.0 C (32.0 F)
n/a
n/a
Jul
40.0 C (104.0 F)
2.2 C (36.0 F)
n/a
n/a
Aug
37.8 C (100.0 F)
1.7 C (35.1 F)
n/a
n/a
Sep
34.4 C (93.9 F)
-4.4 C (24.1 F)
n/a
n/a
Oct
28.9 C (84.0 F)
-10.0 C (14.0 F)
n/a
n/a
Nov
25.0 C (77.0 F)
-22.8 C (-9.0 F)
n/a
n/a
Dec
20.0 C (68.0 F)
-36.1 C (-33.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Orillia still stand. 1895 holds the most, with 66.
Standing records at Orillia by the year they were set
Year set
Standing records
1892
9
1893
21
1894
49
1895
66
1896
43
1897
23
1898
30
1899
22
1900
34
1901
12
1902
18
1903
7
1904
25
1905
6
1906
33
1907
13
1908
21
1909
22
1910
12
1911
31
1912
13
1913
31
1914
38
1915
20
1916
41
1917
22
1918
25
1919
5
1920
5
1925
1
1926
29
1927
16
1929
23
1930
28
1931
18
1932
24
1933
28
1934
36
1935
20
1936
39
1937
10
1938
22
1939
12
1940
19
1941
23
1942
14
1943
24
1944
7
1945
38
1946
31
1947
25
1948
22
1949
35
1950
28
1951
22
1952
11
1953
15
1954
18
1955
13
1956
30
1957
19
1958
15
1959
24
1960
9
1961
19
All-Time Record Progression
3 new records
3 all-time records were set at Orillia between 31 August 1941 and 6 August 1955. Each dot is a new record.
When Orillia set new all-time records
Date
Kind
Detail
1941-08-31
Record daily precipitation
Record daily precipitation 89.9 mm (3.5 in)
1944-07-19
Record daily precipitation
Record daily precipitation 95.8 mm (3.8 in)
1955-08-06
Record daily precipitation
Record daily precipitation 147.3 mm (5.8 in)
Wettest Day of Each Month
Aug: 147.3 mm (5.8 in)
The wettest day on record for each calendar month at Orillia. The most was 147.3 mm (5.8 in) on 6 August 1955.
Record daily precipitation for each month at Orillia
Month
Record daily precipitation (mm)
Date
Jan
38.1 mm (1.5 in)
21 January 1940
Feb
37.6 mm (1.5 in)
5 February 1889
Mar
52.1 mm (2.1 in)
5 March 1954
Apr
36.6 mm (1.4 in)
25 April 1951
May
41.9 mm (1.6 in)
20 May 1952
Jun
86.1 mm (3.4 in)
23 June 1944
Jul
95.8 mm (3.8 in)
19 July 1944
Aug
147.3 mm (5.8 in)
6 August 1955
Sep
66.5 mm (2.6 in)
12 September 1878
Oct
61.0 mm (2.4 in)
15 October 1954
Nov
53.6 mm (2.1 in)
13 November 1871
Dec
73.7 mm (2.9 in)
24 December 1878
Period of Record Coverage
1892 to 1961
Complete yearUnder 90 percent of days
65 years of record at Orillia, 1892 to 1961. 12 years have data for under 90 percent of days and are left out of rankings: 1892, 1897, 1903, 1905, 1910, 1919, 1920, 1925 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 44 complete years at Orillia, 1894 to 1961. Blue stripes are years cooler than the station's own mean of 5.7 C (42.3 F); red stripes are warmer. The coolest year was 1904, at 3.6 C (38.6 F), and the warmest was 1949, at 7.1 C (44.8 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Orillia as warming stripes, 1894 to 1961
Year
Annual mean temperature
Difference from the station mean
1894
6.1 C
+0.40 C
1895
4.8 C
-0.91 C
1896
5.2 C
-0.52 C
1898
6.4 C
+0.66 C
1900
6.2 C
+0.44 C
1901
5.4 C
-0.32 C
1904
3.6 C
-2.08 C
1906
6.7 C
+1.01 C
1907
5.4 C
-0.37 C
1908
6.8 C
+1.10 C
1909
6.4 C
+0.65 C
1912
5.3 C
-0.46 C
1917
4.5 C
-1.24 C
1918
5.9 C
+0.20 C
1926
4.0 C
-1.74 C
1927
5.9 C
+0.17 C
1929
4.8 C
-0.88 C
1930
5.7 C
+0.02 C
1931
7.0 C
+1.27 C
1932
6.1 C
+0.38 C
1934
4.6 C
-1.14 C
1935
5.1 C
-0.67 C
1936
5.1 C
-0.63 C
1937
6.7 C
+1.02 C
1938
6.8 C
+1.07 C
1939
5.6 C
-0.17 C
1940
4.5 C
-1.23 C
1941
6.2 C
+0.46 C
1942
5.9 C
+0.19 C
1943
4.5 C
-1.20 C
1944
5.9 C
+0.14 C
1945
5.4 C
-0.34 C
1946
6.5 C
+0.76 C
1949
7.1 C
+1.37 C
1950
5.3 C
-0.43 C
1951
5.7 C
-0.02 C
1952
6.5 C
+0.73 C
1953
7.1 C
+1.35 C
1956
5.2 C
-0.50 C
1957
6.1 C
+0.33 C
1958
5.6 C
-0.08 C
1959
6.0 C
+0.26 C
1960
6.0 C
+0.23 C
1961
6.2 C
+0.52 C
The fitted trend in annual mean temperature here over 1894 to 1961 is 0.1 C (-0.1 to 0.2) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.3) per decade. The slope is a straight line fitted to 44 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Orillia
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.1 C (-0.1 to 0.2) per decade
0.1 F (-0.1 to 0.3) per decade
1894 to 1961
44
Not clearly different from zero
Mean daily maximum
0.1 C (-0.1 to 0.2) per decade
0.1 F (-0.1 to 0.4) per decade
1894 to 1961
44
Not clearly different from zero
Mean daily minimum
0.1 C (-0.1 to 0.2) per decade
0.1 F (-0.1 to 0.3) per decade
1894 to 1961
44
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
1871 to 1961
Yearly extremes at Orillia: 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)
1911
32.8 C (91.0 F)
65
Coldest night (TNn)
-36.1 C (-33.0 F)
1914
-31.1 C (-24.0 F)
65
Wettest day (Rx1day)
147.3 mm (5.8 in)
1955
40.1 mm (1.6 in)
85
Wettest five days (Rx5day)
161.3 mm (6.4 in)
1955
63.8 mm (2.5 in)
85
Longest dry spell (CDD)
41 days
1907
16 days
85
Hottest day (TXx)
The hottest day of the year at Orillia, 1871 to 1961. The record is 40.0 C (104.0 F) in 1911, marked on the chart; the median year is 32.8 C (91.0 F).
Hottest day (TXx) at Orillia by year
Year
Hottest day (TXx)
1871
n/a
1872
n/a
1873
n/a
1874
n/a
1875
n/a
1876
n/a
1877
n/a
1878
n/a
1879
n/a
1880
n/a
1881
n/a
1882
n/a
1883
n/a
1884
n/a
1885
n/a
1886
n/a
1887
n/a
1888
n/a
1889
n/a
1890
n/a
1891
n/a
1892
31.1 C (88.0 F)
1893
32.2 C (90.0 F)
1894
33.3 C (91.9 F)
1895
31.7 C (89.1 F)
1896
32.8 C (91.0 F)
1897
32.8 C (91.0 F)
1898
32.8 C (91.0 F)
1899
31.7 C (89.1 F)
1900
33.3 C (91.9 F)
1901
34.4 C (93.9 F)
1902
31.1 C (88.0 F)
1903
22.2 C (72.0 F)
1904
31.1 C (88.0 F)
1905
28.9 C (84.0 F)
1906
31.1 C (88.0 F)
1907
33.3 C (91.9 F)
1908
33.3 C (91.9 F)
1909
32.2 C (90.0 F)
1910
34.4 C (93.9 F)
1911
40.0 C (104.0 F)
1912
35.0 C (95.0 F)
1913
36.7 C (98.1 F)
1914
35.6 C (96.1 F)
1915
32.2 C (90.0 F)
1916
38.3 C (100.9 F)
1917
36.1 C (97.0 F)
1918
37.8 C (100.0 F)
1919
32.8 C (91.0 F)
1920
1.1 C (34.0 F)
1925
7.8 C (46.0 F)
1926
31.1 C (88.0 F)
1927
31.7 C (89.1 F)
1929
34.4 C (93.9 F)
1930
31.7 C (89.1 F)
1931
35.6 C (96.1 F)
1932
32.8 C (91.0 F)
1933
33.9 C (93.0 F)
1934
32.8 C (91.0 F)
1935
34.4 C (93.9 F)
1936
37.2 C (99.0 F)
1937
33.3 C (91.9 F)
1938
33.3 C (91.9 F)
1939
33.9 C (93.0 F)
1940
32.2 C (90.0 F)
1941
35.0 C (95.0 F)
1942
32.2 C (90.0 F)
1943
33.3 C (91.9 F)
1944
34.4 C (93.9 F)
1945
30.0 C (86.0 F)
1946
33.9 C (93.0 F)
1947
32.2 C (90.0 F)
1948
34.4 C (93.9 F)
1949
33.9 C (93.0 F)
1950
30.0 C (86.0 F)
1951
30.0 C (86.0 F)
1952
32.2 C (90.0 F)
1953
34.4 C (93.9 F)
1954
28.9 C (84.0 F)
1955
34.4 C (93.9 F)
1956
31.1 C (88.0 F)
1957
31.7 C (89.1 F)
1958
29.4 C (84.9 F)
1959
33.9 C (93.0 F)
1960
30.0 C (86.0 F)
1961
32.2 C (90.0 F)
Coldest night (TNn)
The coldest night of the year at Orillia, 1871 to 1961. The record is -36.1 C (-33.0 F) in 1914, marked on the chart; the median year is -31.1 C (-24.0 F).
Coldest night (TNn) at Orillia by year
Year
Coldest night (TNn)
1871
n/a
1872
n/a
1873
n/a
1874
n/a
1875
n/a
1876
n/a
1877
n/a
1878
n/a
1879
n/a
1880
n/a
1881
n/a
1882
n/a
1883
n/a
1884
n/a
1885
n/a
1886
n/a
1887
n/a
1888
n/a
1889
n/a
1890
n/a
1891
n/a
1892
-28.9 C (-20.0 F)
1893
-35.6 C (-32.1 F)
1894
-31.1 C (-24.0 F)
1895
-33.9 C (-29.0 F)
1896
-35.6 C (-32.1 F)
1897
-28.9 C (-20.0 F)
1898
-33.9 C (-29.0 F)
1899
-33.3 C (-27.9 F)
1900
-35.6 C (-32.1 F)
1901
-29.4 C (-20.9 F)
1902
-27.2 C (-17.0 F)
1903
-33.3 C (-27.9 F)
1904
-35.6 C (-32.1 F)
1905
-28.3 C (-18.9 F)
1906
-31.1 C (-24.0 F)
1907
-30.0 C (-22.0 F)
1908
-32.8 C (-27.0 F)
1909
-26.1 C (-15.0 F)
1910
-28.9 C (-20.0 F)
1911
-27.2 C (-17.0 F)
1912
-35.6 C (-32.1 F)
1913
-30.0 C (-22.0 F)
1914
-36.1 C (-33.0 F)
1915
-23.3 C (-9.9 F)
1916
-29.4 C (-20.9 F)
1917
-34.4 C (-29.9 F)
1918
-33.9 C (-29.0 F)
1919
-27.8 C (-18.0 F)
1920
-31.1 C (-24.0 F)
1925
-31.1 C (-24.0 F)
1926
-31.7 C (-25.1 F)
1927
-32.8 C (-27.0 F)
1929
-27.8 C (-18.0 F)
1930
-33.3 C (-27.9 F)
1931
-27.8 C (-18.0 F)
1932
-29.4 C (-20.9 F)
1933
-36.1 C (-33.0 F)
1934
-35.0 C (-31.0 F)
1935
-32.8 C (-27.0 F)
1936
-30.0 C (-22.0 F)
1937
-21.1 C (-6.0 F)
1938
-28.9 C (-20.0 F)
1939
-31.1 C (-24.0 F)
1940
-32.8 C (-27.0 F)
1941
-27.8 C (-18.0 F)
1942
-35.6 C (-32.1 F)
1943
-34.4 C (-29.9 F)
1944
-26.7 C (-16.1 F)
1945
-32.2 C (-26.0 F)
1946
-31.1 C (-24.0 F)
1947
-29.4 C (-20.9 F)
1948
-31.7 C (-25.1 F)
1949
-24.4 C (-11.9 F)
1950
-32.2 C (-26.0 F)
1951
-33.9 C (-29.0 F)
1952
-32.8 C (-27.0 F)
1953
-27.8 C (-18.0 F)
1954
-30.0 C (-22.0 F)
1955
-30.0 C (-22.0 F)
1956
-26.1 C (-15.0 F)
1957
-32.8 C (-27.0 F)
1958
-32.8 C (-27.0 F)
1959
-32.8 C (-27.0 F)
1960
-31.7 C (-25.1 F)
1961
-31.1 C (-24.0 F)
Wettest day (Rx1day)
The wettest day of the year at Orillia, 1871 to 1961. The record is 147.3 mm (5.8 in) in 1955, marked on the chart; the median year is 40.1 mm (1.6 in).
Wettest day (Rx1day) at Orillia by year
Year
Wettest day (Rx1day)
1871
53.6 mm (2.1 in)
1872
47.8 mm (1.9 in)
1873
27.9 mm (1.1 in)
1874
37.6 mm (1.5 in)
1875
33.3 mm (1.3 in)
1876
37.3 mm (1.5 in)
1877
41.4 mm (1.6 in)
1878
73.7 mm (2.9 in)
1879
62.5 mm (2.5 in)
1880
43.7 mm (1.7 in)
1881
22.6 mm (0.9 in)
1882
26.7 mm (1.1 in)
1883
38.4 mm (1.5 in)
1884
46.0 mm (1.8 in)
1885
41.1 mm (1.6 in)
1886
33.8 mm (1.3 in)
1887
30.7 mm (1.2 in)
1888
53.1 mm (2.1 in)
1889
37.6 mm (1.5 in)
1890
52.3 mm (2.1 in)
1891
33.3 mm (1.3 in)
1892
40.1 mm (1.6 in)
1893
36.1 mm (1.4 in)
1894
37.3 mm (1.5 in)
1895
38.6 mm (1.5 in)
1896
53.8 mm (2.1 in)
1897
60.5 mm (2.4 in)
1898
28.2 mm (1.1 in)
1899
34.0 mm (1.3 in)
1900
21.1 mm (0.8 in)
1901
39.6 mm (1.6 in)
1902
51.8 mm (2.0 in)
1903
30.5 mm (1.2 in)
1904
30.7 mm (1.2 in)
1905
23.4 mm (0.9 in)
1906
58.7 mm (2.3 in)
1907
30.7 mm (1.2 in)
1908
52.8 mm (2.1 in)
1909
46.2 mm (1.8 in)
1910
32.3 mm (1.3 in)
1911
37.1 mm (1.5 in)
1912
45.2 mm (1.8 in)
1913
29.5 mm (1.2 in)
1914
43.9 mm (1.7 in)
1915
20.3 mm (0.8 in)
1916
27.4 mm (1.1 in)
1917
66.5 mm (2.6 in)
1918
59.7 mm (2.4 in)
1919
20.3 mm (0.8 in)
1920
n/a
1925
25.4 mm (1.0 in)
1926
40.1 mm (1.6 in)
1927
55.9 mm (2.2 in)
1929
38.1 mm (1.5 in)
1930
38.4 mm (1.5 in)
1931
30.0 mm (1.2 in)
1932
61.2 mm (2.4 in)
1933
36.8 mm (1.4 in)
1934
47.0 mm (1.9 in)
1935
28.2 mm (1.1 in)
1936
40.4 mm (1.6 in)
1937
41.1 mm (1.6 in)
1938
60.7 mm (2.4 in)
1939
41.4 mm (1.6 in)
1940
47.0 mm (1.9 in)
1941
89.9 mm (3.5 in)
1942
50.8 mm (2.0 in)
1943
30.7 mm (1.2 in)
1944
95.8 mm (3.8 in)
1945
33.8 mm (1.3 in)
1946
31.8 mm (1.3 in)
1947
41.7 mm (1.6 in)
1948
41.7 mm (1.6 in)
1949
30.0 mm (1.2 in)
1950
39.4 mm (1.6 in)
1951
53.3 mm (2.1 in)
1952
41.9 mm (1.6 in)
1953
47.2 mm (1.9 in)
1954
61.0 mm (2.4 in)
1955
147.3 mm (5.8 in)
1956
34.3 mm (1.4 in)
1957
48.3 mm (1.9 in)
1958
35.1 mm (1.4 in)
1959
49.5 mm (1.9 in)
1960
33.5 mm (1.3 in)
1961
47.5 mm (1.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Orillia, 1871 to 1961. The record is 161.3 mm (6.4 in) in 1955, marked on the chart; the median year is 63.8 mm (2.5 in).
Wettest five days (Rx5day) at Orillia by year
Year
Wettest five days (Rx5day)
1871
65.0 mm (2.6 in)
1872
60.4 mm (2.4 in)
1873
50.5 mm (2.0 in)
1874
44.7 mm (1.8 in)
1875
59.7 mm (2.4 in)
1876
63.6 mm (2.5 in)
1877
52.1 mm (2.1 in)
1878
148.0 mm (5.8 in)
1879
66.3 mm (2.6 in)
1880
76.5 mm (3.0 in)
1881
33.3 mm (1.3 in)
1882
51.6 mm (2.0 in)
1883
53.6 mm (2.1 in)
1884
69.1 mm (2.7 in)
1885
47.2 mm (1.9 in)
1886
60.4 mm (2.4 in)
1887
49.7 mm (2.0 in)
1888
74.2 mm (2.9 in)
1889
59.2 mm (2.3 in)
1890
72.7 mm (2.9 in)
1891
68.5 mm (2.7 in)
1892
65.3 mm (2.6 in)
1893
67.5 mm (2.7 in)
1894
94.6 mm (3.7 in)
1895
48.2 mm (1.9 in)
1896
74.9 mm (2.9 in)
1897
103.5 mm (4.1 in)
1898
60.6 mm (2.4 in)
1899
69.7 mm (2.7 in)
1900
52.6 mm (2.1 in)
1901
100.1 mm (3.9 in)
1902
88.6 mm (3.5 in)
1903
78.2 mm (3.1 in)
1904
46.4 mm (1.8 in)
1905
58.4 mm (2.3 in)
1906
63.2 mm (2.5 in)
1907
57.1 mm (2.2 in)
1908
53.3 mm (2.1 in)
1909
89.9 mm (3.5 in)
1910
48.3 mm (1.9 in)
1911
58.9 mm (2.3 in)
1912
62.2 mm (2.4 in)
1913
58.9 mm (2.3 in)
1914
74.4 mm (2.9 in)
1915
38.1 mm (1.5 in)
1916
60.7 mm (2.4 in)
1917
73.6 mm (2.9 in)
1918
65.3 mm (2.6 in)
1919
35.5 mm (1.4 in)
1920
n/a
1925
45.8 mm (1.8 in)
1926
72.9 mm (2.9 in)
1927
68.6 mm (2.7 in)
1929
71.8 mm (2.8 in)
1930
46.7 mm (1.8 in)
1931
55.7 mm (2.2 in)
1932
78.4 mm (3.1 in)
1933
53.8 mm (2.1 in)
1934
71.3 mm (2.8 in)
1935
70.4 mm (2.8 in)
1936
57.0 mm (2.2 in)
1937
65.0 mm (2.6 in)
1938
133.1 mm (5.2 in)
1939
70.9 mm (2.8 in)
1940
95.5 mm (3.8 in)
1941
102.9 mm (4.1 in)
1942
79.7 mm (3.1 in)
1943
54.4 mm (2.1 in)
1944
98.6 mm (3.9 in)
1945
58.6 mm (2.3 in)
1946
63.8 mm (2.5 in)
1947
69.7 mm (2.7 in)
1948
57.7 mm (2.3 in)
1949
38.6 mm (1.5 in)
1950
49.0 mm (1.9 in)
1951
62.7 mm (2.5 in)
1952
70.1 mm (2.8 in)
1953
53.6 mm (2.1 in)
1954
115.9 mm (4.6 in)
1955
161.3 mm (6.4 in)
1956
63.3 mm (2.5 in)
1957
94.3 mm (3.7 in)
1958
56.6 mm (2.2 in)
1959
69.6 mm (2.7 in)
1960
122.2 mm (4.8 in)
1961
85.6 mm (3.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Orillia, 1871 to 1961. The record is 41 days in 1907, marked on the chart; the median year is 16 days.
Longest dry spell (CDD) at Orillia by year
Year
Longest dry spell (CDD)
1871
20 days
1872
13 days
1873
13 days
1874
18 days
1875
26 days
1876
15 days
1877
21 days
1878
14 days
1879
16 days
1880
14 days
1881
34 days
1882
17 days
1883
10 days
1884
16 days
1885
20 days
1886
18 days
1887
31 days
1888
23 days
1889
17 days
1890
11 days
1891
15 days
1892
20 days
1893
10 days
1894
17 days
1895
16 days
1896
11 days
1897
10 days
1898
15 days
1899
12 days
1900
12 days
1901
17 days
1902
16 days
1903
11 days
1904
24 days
1905
32 days
1906
25 days
1907
41 days
1908
26 days
1909
16 days
1910
36 days
1911
15 days
1912
23 days
1913
15 days
1914
17 days
1915
13 days
1916
21 days
1917
17 days
1918
12 days
1919
23 days
1920
n/a
1925
4 days
1926
11 days
1927
14 days
1929
18 days
1930
12 days
1931
12 days
1932
17 days
1933
9 days
1934
11 days
1935
17 days
1936
24 days
1937
13 days
1938
12 days
1939
20 days
1940
16 days
1941
26 days
1942
17 days
1943
19 days
1944
16 days
1945
14 days
1946
18 days
1947
20 days
1948
11 days
1949
24 days
1950
15 days
1951
15 days
1952
14 days
1953
17 days
1954
12 days
1955
14 days
1956
18 days
1957
21 days
1958
19 days
1959
10 days
1960
11 days
1961
14 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
44 years with a frost
Across 44 years with a frost, the median last spring frost at Orillia falls on 17 May and the median first autumn frost on 1 October, which leaves a median of 140 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 Orillia
Measure
Median, all years
Earliest period
Recent period (1926 to 1961)
Recent against earliest
Fitted trend
Last spring frost
17 May
n/a
17 May
n/a
+0.4 days per decade
First autumn frost
1 October
n/a
1 October
n/a
-0.7 days per decade
Growing days
140 days
n/a
139 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
68 years, 1873 to 1961
A day with at least 40.4 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 90.7 mm (3.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Orillia: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
40.4 mm (1.6 in)
5 years
52.1 mm (2.1 in)
10 years
60.6 mm (2.4 in)
25 years
72.0 mm (2.8 in)
50 years
81.1 mm (3.2 in)
100 years
90.7 mm (3.6 in)
Longer than the 68 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, 68 years of values from 1873 to 1961.
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: 95.8 mm (3.8 in) in 1944; 89.9 mm (3.5 in) in 1941; 73.7 mm (2.9 in) in 1878.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Orillia, at 1929 and 1957. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1929 ran 0.4 C (0.8 F) lower than in the years before (possible change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1957 ran 0.4 C (0.7 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Orillia, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1929
-0.4
-0.8
possible
5
1957
+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 Orillia standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Orillia 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.