Cottam Weather Records (CA006131910)

Record envelope, standing records and threshold days for Cottam (CA006131910), Ontario, Canada, with 45 years of record.

Key Facts for Cottam

Cottam (CA006131910) is a weather station in Ontario, Canada at 42.12 latitude and -82.75 longitude, 185 m (607 ft) above sea level.
The station reports from 1882 to 1926, 45 years of record.
1,464 records set at Cottam still stand.
Records are tracked for prcp, snow: an element needs 30 years of data to be eligible.
Cottam set a daily record precipitation of 27.9 mm (1.1 in) on 14 November 1921.

About the Station

Location: Ontario, Canada, 42.12 latitude, -82.75 longitude.
Elevation: 185 m (607 ft).
Period of record: 1882 to 1926, 45 years.
Eligible elements: 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 Cottam. 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 Cottam, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	16.7 C (62.1 F)	-28.9 C (-20.0 F)	n/a	n/a
Feb	13.9 C (57.0 F)	-31.7 C (-25.1 F)	n/a	n/a
Mar	26.7 C (80.1 F)	-22.2 C (-8.0 F)	n/a	n/a
Apr	28.9 C (84.0 F)	-12.2 C (10.0 F)	n/a	n/a
May	35.0 C (95.0 F)	-7.8 C (18.0 F)	n/a	n/a
Jun	35.6 C (96.1 F)	-1.1 C (30.0 F)	n/a	n/a
Jul	37.8 C (100.0 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	36.1 C (97.0 F)	-3.3 C (26.1 F)	n/a	n/a
Oct	35.0 C (95.0 F)	-12.2 C (10.0 F)	n/a	n/a
Nov	23.3 C (73.9 F)	-15.0 C (5.0 F)	n/a	n/a
Dec	15.6 C (60.1 F)	-27.2 C (-17.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Cottam still stand. 1918 holds the most, with 116.

Wettest Day of Each Month

Jul: 93.0 mm (3.7 in)

The wettest day on record for each calendar month at Cottam. The most was 93.0 mm (3.7 in) on 28 July 1909.

Record daily precipitation for each month at Cottam
Month	Record daily precipitation (mm)	Date
Jan	61.2 mm (2.4 in)	5 January 1917
Feb	46.2 mm (1.8 in)	15 February 1908
Mar	77.5 mm (3.1 in)	26 March 1913
Apr	57.2 mm (2.3 in)	30 April 1909
May	81.5 mm (3.2 in)	31 May 1900
Jun	88.1 mm (3.5 in)	21 June 1896
Jul	93.0 mm (3.7 in)	28 July 1909
Aug	76.2 mm (3.0 in)	13 August 1908
Sep	71.1 mm (2.8 in)	16 September 1888
Oct	67.3 mm (2.6 in)	4 October 1893
Nov	57.2 mm (2.3 in)	23 November 1909
Dec	50.8 mm (2.0 in)	6 December 1906

Period of Record Coverage

1906 to 1926

18 years of record at Cottam, 1906 to 1926. 4 years have data for under 90 percent of days and are left out of rankings: 1906, 1915, 1922, 1926.

Days with data per year at Cottam
Year	Days with data	Share of year	Complete
1906	274	75%	No
1907	365	100%	Yes
1908	366	100%	Yes
1909	365	100%	Yes
1910	364	100%	Yes
1911	365	100%	Yes
1912	366	100%	Yes
1913	365	100%	Yes
1914	365	100%	Yes
1915	303	83%	No
1916	363	99%	Yes
1917	363	99%	Yes
1918	363	99%	Yes
1919	363	99%	Yes
1920	362	99%	Yes
1921	334	92%	Yes
1922	58	16%	No
1926	30	8%	No

Latest Records

Latest records at Cottam
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
14 November 1921	Cottam, CA	daily rain	27.9 mm (1.1 in)	15.2 mm (0.6 in)	11 years	23 of 100 (Routine)
3 November 1921	Cottam, CA	daily snowfall	2.5 cm (1.0 in)	1.7 cm (0.7 in)	11 years	11 of 100 (Routine)
10 September 1921	Cottam, CA	daily rain	37.6 mm (1.5 in)	6.6 mm (0.26 in)	0 years	9 of 100 (Routine)
17 August 1921	Cottam, CA	daily rain	47.0 mm (1.9 in)	19.8 mm (0.8 in)	33 years	34 of 100 (Routine)
2 August 1921	Cottam, CA	daily rain	22.4 mm (0.9 in)	2.8 mm (0.11 in)	35 years	16 of 100 (Routine)
9 July 1921	Cottam, CA	daily rain	7.6 mm (0.30 in)	0.5 mm (0.02 in)	24 years	11 of 100 (Routine)
12 June 1921	Cottam, CA	daily rain	18.0 mm (0.7 in)	10.1 mm (0.4 in)	19 years	18 of 100 (Routine)
27 May 1921	Cottam, CA	daily rain	47.5 mm (1.9 in)	13.2 mm (0.5 in)	8 years	19 of 100 (Routine)
26 December 1920	Cottam, CA	daily snowfall	15.2 cm (6.0 in)	5.0 cm (2.0 in)	24 years	22 of 100 (Routine)
22 December 1920	Cottam, CA	daily rain	25.4 mm (1.0 in)	9.7 mm (0.38 in)	30 years	24 of 100 (Routine)
4 December 1920	Cottam, CA	daily rain	19.8 mm (0.8 in)	10.9 mm (0.4 in)	4 years	17 of 100 (Routine)
25 October 1920	Cottam, CA	daily rain	61.0 mm (2.4 in)	25.4 mm (1.0 in)	7 years	32 of 100 (Routine)
27 September 1920	Cottam, CA	daily rain	13.2 mm (0.5 in)	2.3 mm (0.09 in)	23 years	12 of 100 (Routine)
10 September 1920	Cottam, CA	daily rain	31.0 mm (1.2 in)	22.6 mm (0.9 in)	13 years	26 of 100 (Routine)
9 August 1920	Cottam, CA	daily rain	4.1 mm (0.16 in)	1.6 mm (0.06 in)	34 years	14 of 100 (Routine)
5 July 1920	Cottam, CA	daily rain	21.6 mm (0.9 in)	10.9 mm (0.4 in)	17 years	16 of 100 (Routine)
17 June 1920	Cottam, CA	daily rain	33.0 mm (1.3 in)	5.6 mm (0.22 in)	28 years	16 of 100 (Routine)
22 April 1920	Cottam, CA	daily rain	24.1 mm (0.9 in)	4.3 mm (0.17 in)	21 years	14 of 100 (Routine)
11 April 1920	Cottam, CA	daily snowfall	5.1 cm (2.0 in)	5.1 cm (2.0 in)	36 years	24 of 100 (Routine)
4 April 1920	Cottam, CA	daily rain	29.0 mm (1.1 in)	7.7 mm (0.30 in)	27 years	19 of 100 (Routine)

Climate Trend

12 complete years, 1907 to 1919

One stripe for each of 12 complete years at Cottam, 1907 to 1919. Blue stripes are years cooler than the station's own mean of 7.9 C (46.3 F); red stripes are warmer. The coolest year was 1907, at 6.9 C (44.4 F), and the warmest was 1919, at 9.3 C (48.7 F). The strongest colour marks a difference of 1.4 C (2.5 F).

Annual mean temperature at Cottam as warming stripes, 1907 to 1919
Year	Annual mean temperature	Difference from the station mean
1907	6.9 C	-1.06 C
1908	8.4 C	+0.44 C
1909	8.2 C	+0.29 C
1910	7.8 C	-0.13 C
1911	8.6 C	+0.69 C
1912	7.2 C	-0.77 C
1913	8.4 C	+0.48 C
1914	7.4 C	-0.59 C
1916	7.8 C	-0.19 C
1917	7.0 C	-0.96 C
1918	8.4 C	+0.50 C
1919	9.3 C	+1.32 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

1882 to 1926

Yearly extremes at Cottam: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	37.8 C (100.0 F)	1911	35.0 C (95.0 F)	18
Coldest night (TNn)	-31.7 C (-25.1 F)	1912	-23.9 C (-11.0 F)	17
Wettest day (Rx1day)	93.0 mm (3.7 in)	1909	50.2 mm (2.0 in)	40
Wettest five days (Rx5day)	119.0 mm (4.7 in)	1892	71.9 mm (2.8 in)	40
Longest dry spell (CDD)	42 days	1894	20 days	40

Hottest day (TXx)

The hottest day of the year at Cottam, 1882 to 1926. The record is 37.8 C (100.0 F) in 1911, marked on the chart; the median year is 35.0 C (95.0 F).

Hottest day (TXx) at Cottam by year
Year	Hottest day (TXx)
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	n/a
1893	n/a
1894	n/a
1895	n/a
1896	n/a
1897	n/a
1898	n/a
1899	n/a
1900	n/a
1901	n/a
1902	n/a
1903	n/a
1904	n/a
1905	n/a
1906	34.4 C (93.9 F)
1907	31.1 C (88.0 F)
1908	35.0 C (95.0 F)
1909	34.4 C (93.9 F)
1910	35.0 C (95.0 F)
1911	37.8 C (100.0 F)
1912	36.1 C (97.0 F)
1913	36.1 C (97.0 F)
1914	35.0 C (95.0 F)
1915	31.1 C (88.0 F)
1916	36.7 C (98.1 F)
1917	35.6 C (96.1 F)
1918	37.8 C (100.0 F)
1919	35.0 C (95.0 F)
1920	35.0 C (95.0 F)
1921	36.1 C (97.0 F)
1922	12.2 C (54.0 F)
1926	15.6 C (60.1 F)

Coldest night (TNn)

The coldest night of the year at Cottam, 1882 to 1926. The record is -31.7 C (-25.1 F) in 1912, marked on the chart; the median year is -23.9 C (-11.0 F).

Coldest night (TNn) at Cottam by year
Year	Coldest night (TNn)
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	n/a
1893	n/a
1894	n/a
1895	n/a
1896	n/a
1897	n/a
1898	n/a
1899	n/a
1900	n/a
1901	n/a
1902	n/a
1903	n/a
1904	n/a
1905	n/a
1906	-15.0 C (5.0 F)
1907	-26.1 C (-15.0 F)
1908	-25.6 C (-14.1 F)
1909	-25.0 C (-13.0 F)
1910	-21.1 C (-6.0 F)
1911	-19.4 C (-2.9 F)
1912	-31.7 C (-25.1 F)
1913	-23.3 C (-9.9 F)
1914	-27.2 C (-17.0 F)
1915	-28.9 C (-20.0 F)
1916	-23.9 C (-11.0 F)
1917	-27.8 C (-18.0 F)
1918	-30.0 C (-22.0 F)
1919	-19.4 C (-2.9 F)
1920	-22.8 C (-9.0 F)
1921	-17.8 C (0.0 F)
1922	-22.2 C (-8.0 F)
1926	n/a

Wettest day (Rx1day)

The wettest day of the year at Cottam, 1882 to 1926. The record is 93.0 mm (3.7 in) in 1909, marked on the chart; the median year is 50.2 mm (2.0 in).

Wettest day (Rx1day) at Cottam by year
Year	Wettest day (Rx1day)
1882	26.9 mm (1.1 in)
1883	30.7 mm (1.2 in)
1884	56.6 mm (2.2 in)
1885	38.9 mm (1.5 in)
1886	86.4 mm (3.4 in)
1887	39.1 mm (1.5 in)
1888	71.1 mm (2.8 in)
1889	57.4 mm (2.3 in)
1890	56.9 mm (2.2 in)
1891	34.3 mm (1.4 in)
1892	48.3 mm (1.9 in)
1893	67.3 mm (2.6 in)
1894	44.5 mm (1.8 in)
1895	38.6 mm (1.5 in)
1896	88.1 mm (3.5 in)
1897	40.6 mm (1.6 in)
1898	32.3 mm (1.3 in)
1899	30.0 mm (1.2 in)
1900	81.5 mm (3.2 in)
1901	31.0 mm (1.2 in)
1902	57.7 mm (2.3 in)
1903	41.4 mm (1.6 in)
1904	36.8 mm (1.4 in)
1905	66.5 mm (2.6 in)
1906	50.8 mm (2.0 in)
1907	59.2 mm (2.3 in)
1908	76.2 mm (3.0 in)
1909	93.0 mm (3.7 in)
1910	45.0 mm (1.8 in)
1911	41.9 mm (1.6 in)
1912	82.6 mm (3.3 in)
1913	77.5 mm (3.1 in)
1914	50.8 mm (2.0 in)
1915	49.5 mm (1.9 in)
1916	49.5 mm (1.9 in)
1917	64.8 mm (2.6 in)
1918	62.0 mm (2.4 in)
1919	41.9 mm (1.6 in)
1920	61.0 mm (2.4 in)
1921	47.5 mm (1.9 in)
1922	n/a
1926	n/a

Wettest five days (Rx5day)

The wettest five days of the year at Cottam, 1882 to 1926. The record is 119.0 mm (4.7 in) in 1892, marked on the chart; the median year is 71.9 mm (2.8 in).

Wettest five days (Rx5day) at Cottam by year
Year	Wettest five days (Rx5day)
1882	72.7 mm (2.9 in)
1883	65.2 mm (2.6 in)
1884	85.8 mm (3.4 in)
1885	63.5 mm (2.5 in)
1886	99.4 mm (3.9 in)
1887	83.4 mm (3.3 in)
1888	80.0 mm (3.1 in)
1889	98.8 mm (3.9 in)
1890	68.8 mm (2.7 in)
1891	65.1 mm (2.6 in)
1892	119.0 mm (4.7 in)
1893	69.3 mm (2.7 in)
1894	65.1 mm (2.6 in)
1895	59.9 mm (2.4 in)
1896	96.2 mm (3.8 in)
1897	54.6 mm (2.1 in)
1898	56.9 mm (2.2 in)
1899	55.7 mm (2.2 in)
1900	101.3 mm (4.0 in)
1901	69.4 mm (2.7 in)
1902	112.9 mm (4.4 in)
1903	62.1 mm (2.4 in)
1904	69.2 mm (2.7 in)
1905	75.6 mm (3.0 in)
1906	68.6 mm (2.7 in)
1907	75.9 mm (3.0 in)
1908	101.6 mm (4.0 in)
1909	95.8 mm (3.8 in)
1910	71.1 mm (2.8 in)
1911	87.6 mm (3.4 in)
1912	86.4 mm (3.4 in)
1913	113.1 mm (4.5 in)
1914	91.4 mm (3.6 in)
1915	70.6 mm (2.8 in)
1916	100.3 mm (3.9 in)
1917	82.6 mm (3.3 in)
1918	62.0 mm (2.4 in)
1919	63.0 mm (2.5 in)
1920	61.0 mm (2.4 in)
1921	62.7 mm (2.5 in)
1922	n/a
1926	n/a

Longest dry spell (CDD)

The longest dry spell of the year at Cottam, 1882 to 1926. The record is 42 days in 1894, marked on the chart; the median year is 20 days.

Longest dry spell (CDD) at Cottam by year
Year	Longest dry spell (CDD)
1882	16 days
1883	11 days
1884	19 days
1885	19 days
1886	17 days
1887	19 days
1888	26 days
1889	20 days
1890	13 days
1891	34 days
1892	15 days
1893	16 days
1894	42 days
1895	17 days
1896	16 days
1897	19 days
1898	15 days
1899	19 days
1900	29 days
1901	20 days
1902	14 days
1903	20 days
1904	22 days
1905	24 days
1906	23 days
1907	17 days
1908	40 days
1909	15 days
1910	20 days
1911	12 days
1912	23 days
1913	15 days
1914	22 days
1915	22 days
1916	35 days
1917	21 days
1918	33 days
1919	24 days
1920	23 days
1921	21 days
1922	n/a
1926	n/a

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.

Rainfall Return Levels

35 years, 1883 to 1917

A day with at least 51.9 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 112.9 mm (4.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Cottam: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	51.9 mm (2.0 in)
5 years	69.1 mm (2.7 in)
10 years	80.1 mm (3.2 in)
25 years	93.6 mm (3.7 in)
50 years	103.4 mm (4.1 in)	Longer than the 35 years of record
100 years	112.9 mm (4.4 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 1883 to 1917.

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: 93.0 mm (3.7 in) in 1909; 88.1 mm (3.5 in) in 1896; 86.4 mm (3.4 in) in 1886.

Download the Data

Data for Cottam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Cottam 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-16. Last revised 16 October 2026 (2026-10-16).