Orillia Weather Records (CA006115810)

Record envelope, standing records and threshold days for Orillia (CA006115810), Ontario, Canada, with 91 years of record.

Key Facts for Orillia

Orillia (CA006115810) is a weather station in Ontario, Canada at 44.62 latitude and -79.40 longitude, 224 m (735 ft) above sea level.
The station reports from 1871 to 1961, 91 years of record.
1,464 records set at Orillia still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Orillia set a daily record snowfall of 27.9 cm (11.0 in) on 30 December 1961.

About the Station

Location: Ontario, Canada, 44.62 latitude, -79.40 longitude.
Elevation: 224 m (735 ft).
Period of record: 1871 to 1961, 91 years.
Eligible elements: tmax, tmin, prcp, snow.

Daily Record Envelope and 2026

0 days at or beyond a record

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

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

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.

Days with data per year at Orillia
Year	Days with data	Share of year	Complete
1892	153	42%	No
1893	340	93%	Yes
1894	364	100%	Yes
1895	365	100%	Yes
1896	366	100%	Yes
1897	323	88%	No
1898	362	99%	Yes
1899	345	95%	Yes
1900	357	98%	Yes
1901	365	100%	Yes
1902	336	92%	Yes
1903	102	28%	No
1904	361	99%	Yes
1905	180	49%	No
1906	364	100%	Yes
1907	360	99%	Yes
1908	345	94%	Yes
1909	344	94%	Yes
1910	247	68%	No
1911	341	93%	Yes
1912	352	96%	Yes
1913	329	90%	Yes
1914	343	94%	Yes
1915	334	92%	Yes
1916	353	96%	Yes
1917	364	100%	Yes
1918	365	100%	Yes
1919	152	42%	No
1920	31	8%	No
1925	26	7%	No
1926	365	100%	Yes
1927	364	100%	Yes
1929	365	100%	Yes
1930	365	100%	Yes
1931	365	100%	Yes
1932	366	100%	Yes
1933	320	88%	No
1934	365	100%	Yes
1935	365	100%	Yes
1936	366	100%	Yes
1937	365	100%	Yes
1938	364	100%	Yes
1939	365	100%	Yes
1940	366	100%	Yes
1941	365	100%	Yes
1942	365	100%	Yes
1943	365	100%	Yes
1944	365	100%	Yes
1945	365	100%	Yes
1946	358	98%	Yes
1947	290	79%	No
1948	306	84%	No
1949	365	100%	Yes
1950	365	100%	Yes
1951	365	100%	Yes
1952	366	100%	Yes
1953	364	100%	Yes
1954	334	92%	Yes
1955	275	75%	No
1956	365	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	364	100%	Yes
1960	366	100%	Yes
1961	365	100%	Yes

Latest Records

Latest records at Orillia
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 December 1961	Orillia, CA	daily snowfall	27.9 cm (11.0 in)	6.3 cm (2.5 in)	66 years	40 of 100 (Notable)
30 December 1961	Orillia, CA	daily rain	27.9 mm (1.1 in)	6.3 mm (0.25 in)	66 years	39 of 100 (Notable)
7 December 1961	Orillia, CA	daily snowfall (Tie)	22.9 cm (9.0 in)	tie	62 years	6 of 100 (Routine)
4 December 1961	Orillia, CA	daily high max (Tie)	11.7 C (53.1 F)	tie	44 years	5 of 100 (Routine)
23 November 1961	Orillia, CA	daily rain	25.4 mm (1.0 in)	3.8 mm (0.15 in)	69 years	34 of 100 (Routine)
13 November 1961	Orillia, CA	daily high min	6.1 C (43.0 F)	1.1 C (2.0 F)	32 years	17 of 100 (Routine)
3 November 1961	Orillia, CA	daily high max	21.1 C (70.0 F)	0.5 C (0.9 F)	24 years	14 of 100 (Routine)
15 October 1961	Orillia, CA	daily low max	2.8 C (37.0 F)	0.5 C (0.9 F)	67 years	27 of 100 (Routine)
11 September 1961	Orillia, CA	daily high min	22.2 C (72.0 F)	1.1 C (2.0 F)	55 years	25 of 100 (Routine)
4 September 1961	Orillia, CA	daily high min	21.1 C (70.0 F)	0.5 C (0.9 F)	8 years	10 of 100 (Routine)
2 September 1961	Orillia, CA	daily rain	47.5 mm (1.9 in)	24.6 mm (1.0 in)	55 years	52 of 100 (Notable)
1 September 1961	Orillia, CA	daily rain	37.1 mm (1.5 in)	16.5 mm (0.6 in)	60 years	45 of 100 (Notable)
28 August 1961	Orillia, CA	daily rain	29.7 mm (1.2 in)	10.4 mm (0.4 in)	24 years	24 of 100 (Routine)
24 August 1961	Orillia, CA	daily high min (Tie)	18.9 C (66.0 F)	tie	7 years	2 of 100 (Routine)
13 August 1961	Orillia, CA	daily low max	17.8 C (64.0 F)	0.5 C (0.9 F)	61 years	26 of 100 (Routine)
6 July 1961	Orillia, CA	daily rain	29.2 mm (1.1 in)	12.9 mm (0.5 in)	27 years	29 of 100 (Routine)
5 July 1961	Orillia, CA	daily low min	6.1 C (43.0 F)	2.2 C (4.0 F)	62 years	31 of 100 (Routine)
4 July 1961	Orillia, CA	daily low max	17.8 C (64.0 F)	0.5 C (0.9 F)	34 years	18 of 100 (Routine)
21 June 1961	Orillia, CA	daily low min	4.4 C (39.9 F)	0.6 C (1.1 F)	44 years	21 of 100 (Routine)
30 May 1961	Orillia, CA	daily low min	0.0 C (32.0 F)	0.6 C (1.1 F)	16 years	12 of 100 (Routine)

Climate Trend

44 complete years, 1894 to 1961

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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-17. Last revised 17 October 2026 (2026-10-17).