Lake Cowichan Weather Records (CA001014493)

Record envelope, standing records and threshold days for Lake Cowichan (CA001014493), British Columbia, Canada, with 71 years of record.

Key Facts for Lake Cowichan

Lake Cowichan (CA001014493) is a weather station in British Columbia, Canada at 48.82 latitude and -124.05 longitude, 180 m (591 ft) above sea level.
The station reports from 1924 to 1994, 71 years of record.
1,464 records set at Lake Cowichan still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: British Columbia, Canada, 48.82 latitude, -124.05 longitude.
Elevation: 180 m (591 ft).
Period of record: 1924 to 1994, 71 years.
Eligible elements: none yet.

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 Lake Cowichan. 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 Lake Cowichan, 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)	-16.7 C (1.9 F)	n/a	n/a
Feb	18.9 C (66.0 F)	-15.0 C (5.0 F)	n/a	n/a
Mar	22.8 C (73.0 F)	-10.0 C (14.0 F)	n/a	n/a
Apr	28.9 C (84.0 F)	-6.7 C (19.9 F)	n/a	n/a
May	31.1 C (88.0 F)	-1.7 C (28.9 F)	n/a	n/a
Jun	34.4 C (93.9 F)	0.6 C (33.1 F)	n/a	n/a
Jul	36.7 C (98.1 F)	2.2 C (36.0 F)	n/a	n/a
Aug	36.7 C (98.1 F)	4.4 C (39.9 F)	n/a	n/a
Sep	33.3 C (91.9 F)	-3.3 C (26.1 F)	n/a	n/a
Oct	27.2 C (81.0 F)	-10.6 C (12.9 F)	n/a	n/a
Nov	17.2 C (63.0 F)	-12.2 C (10.0 F)	n/a	n/a
Dec	13.9 C (57.0 F)	-14.4 C (6.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Lake Cowichan still stand. 1926 holds the most, with 119.

Standing records at Lake Cowichan by the year they were set
Year set	Standing records
1924	94
1925	65
1926	119
1927	81
1928	85
1929	68
1930	108
1931	78
1932	72
1933	65
1934	97
1935	112
1936	90
1937	82
1938	78
1939	86
1940	60
1941	24

Wettest Day of Each Month

Oct: 103.6 mm (4.1 in)

The wettest day on record for each calendar month at Lake Cowichan. The most was 103.6 mm (4.1 in) on 17 October 1940.

Record daily precipitation for each month at Lake Cowichan
Month	Record daily precipitation (mm)	Date
Jan	87.4 mm (3.4 in)	20 January 1935
Feb	89.2 mm (3.5 in)	26 February 1932
Mar	95.3 mm (3.8 in)	9 March 1966
Apr	64.8 mm (2.6 in)	12 April 1937
May	38.1 mm (1.5 in)	4 May 1926
Jun	38.1 mm (1.5 in)	18 June 1929
Jul	56.4 mm (2.2 in)	15 July 1934
Aug	30.0 mm (1.2 in)	17 August 1924
Sep	51.6 mm (2.0 in)	22 September 1924
Oct	103.6 mm (4.1 in)	17 October 1940
Nov	103.6 mm (4.1 in)	4 November 1934
Dec	72.1 mm (2.8 in)	19 December 1933

Period of Record Coverage

1924 to 1941

18 years of record at Lake Cowichan, 1924 to 1941. 1 years have data for under 90 percent of days and are left out of rankings: 1941.

Days with data per year at Lake Cowichan
Year	Days with data	Share of year	Complete
1924	366	100%	Yes
1925	365	100%	Yes
1926	365	100%	Yes
1927	365	100%	Yes
1928	366	100%	Yes
1929	365	100%	Yes
1930	365	100%	Yes
1931	365	100%	Yes
1932	366	100%	Yes
1933	365	100%	Yes
1934	365	100%	Yes
1935	364	100%	Yes
1936	366	100%	Yes
1937	365	100%	Yes
1938	365	100%	Yes
1939	365	100%	Yes
1940	366	100%	Yes
1941	120	33%	No

Latest Records

No records were set at this station in the latest data.

Climate Trend

17 complete years, 1924 to 1940

One stripe for each of 17 complete years at Lake Cowichan, 1924 to 1940. Blue stripes are years cooler than the station's own mean of 9.4 C (48.9 F); red stripes are warmer. The coolest year was 1933, at 8.4 C (47.1 F), and the warmest was 1926, at 10.5 C (50.9 F). The strongest colour marks a difference of 1.2 C (2.2 F).

Annual mean temperature at Lake Cowichan as warming stripes, 1924 to 1940
Year	Annual mean temperature	Difference from the station mean
1924	9.4 C	-0.04 C
1925	9.7 C	+0.31 C
1926	10.5 C	+1.12 C
1927	8.8 C	-0.59 C
1928	9.7 C	+0.27 C
1929	8.5 C	-0.85 C
1930	8.8 C	-0.61 C
1931	9.6 C	+0.17 C
1932	9.0 C	-0.43 C
1933	8.4 C	-0.99 C
1934	10.3 C	+0.90 C
1935	9.2 C	-0.18 C
1936	9.5 C	+0.12 C
1937	8.9 C	-0.45 C
1938	9.7 C	+0.30 C
1939	9.7 C	+0.29 C
1940	10.0 C	+0.61 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

1924 to 1967

Yearly extremes at Lake Cowichan: 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)	1938	33.3 C (91.9 F)	18
Coldest night (TNn)	-16.7 C (1.9 F)	1935	-11.4 C (11.5 F)	18
Wettest day (Rx1day)	103.6 mm (4.1 in)	1934	74.7 mm (2.9 in)	21
Wettest five days (Rx5day)	251.2 mm (9.9 in)	1935	192.1 mm (7.6 in)	21
Longest dry spell (CDD)	54 days	1930	27 days	21

Hottest day (TXx)

The hottest day of the year at Lake Cowichan, 1924 to 1967. The record is 36.7 C (98.1 F) in 1938, marked on the chart; the median year is 33.3 C (91.9 F).

Hottest day (TXx) at Lake Cowichan by year
Year	Hottest day (TXx)
1924	33.3 C (91.9 F)
1925	34.4 C (93.9 F)
1926	34.4 C (93.9 F)
1927	33.9 C (93.0 F)
1928	33.3 C (91.9 F)
1929	29.4 C (84.9 F)
1930	30.6 C (87.1 F)
1931	32.2 C (90.0 F)
1932	30.6 C (87.1 F)
1933	34.4 C (93.9 F)
1934	32.2 C (90.0 F)
1935	34.4 C (93.9 F)
1936	32.2 C (90.0 F)
1937	33.3 C (91.9 F)
1938	36.7 C (98.1 F)
1939	36.7 C (98.1 F)
1940	34.4 C (93.9 F)
1941	25.0 C (77.0 F)
1965	n/a
1966	n/a
1967	n/a

Coldest night (TNn)

The coldest night of the year at Lake Cowichan, 1924 to 1967. The record is -16.7 C (1.9 F) in 1935, marked on the chart; the median year is -11.4 C (11.5 F).

Coldest night (TNn) at Lake Cowichan by year
Year	Coldest night (TNn)
1924	-13.9 C (7.0 F)
1925	-5.0 C (23.0 F)
1926	-11.1 C (12.0 F)
1927	-14.4 C (6.1 F)
1928	-6.7 C (19.9 F)
1929	-15.0 C (5.0 F)
1930	-13.9 C (7.0 F)
1931	-5.6 C (21.9 F)
1932	-13.3 C (8.1 F)
1933	-15.0 C (5.0 F)
1934	-3.9 C (25.0 F)
1935	-16.7 C (1.9 F)
1936	-11.7 C (10.9 F)
1937	-14.4 C (6.1 F)
1938	-8.3 C (17.1 F)
1939	-7.2 C (19.0 F)
1940	-6.1 C (21.0 F)
1941	-6.1 C (21.0 F)
1965	n/a
1966	n/a
1967	n/a

Wettest day (Rx1day)

The wettest day of the year at Lake Cowichan, 1924 to 1967. The record is 103.6 mm (4.1 in) in 1934, marked on the chart; the median year is 74.7 mm (2.9 in).

Wettest day (Rx1day) at Lake Cowichan by year
Year	Wettest day (Rx1day)
1924	85.9 mm (3.4 in)
1925	74.4 mm (2.9 in)
1926	63.8 mm (2.5 in)
1927	54.6 mm (2.1 in)
1928	57.2 mm (2.3 in)
1929	75.2 mm (3.0 in)
1930	74.7 mm (2.9 in)
1931	73.7 mm (2.9 in)
1932	89.2 mm (3.5 in)
1933	85.1 mm (3.4 in)
1934	103.6 mm (4.1 in)
1935	87.4 mm (3.4 in)
1936	46.7 mm (1.8 in)
1937	75.2 mm (3.0 in)
1938	40.1 mm (1.6 in)
1939	83.3 mm (3.3 in)
1940	103.6 mm (4.1 in)
1941	64.8 mm (2.6 in)
1965	70.4 mm (2.8 in)
1966	95.3 mm (3.8 in)
1967	72.1 mm (2.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Lake Cowichan, 1924 to 1967. The record is 251.2 mm (9.9 in) in 1935, marked on the chart; the median year is 192.1 mm (7.6 in).

Wettest five days (Rx5day) at Lake Cowichan by year
Year	Wettest five days (Rx5day)
1924	223.8 mm (8.8 in)
1925	193.3 mm (7.6 in)
1926	192.1 mm (7.6 in)
1927	209.1 mm (8.2 in)
1928	159.5 mm (6.3 in)
1929	187.2 mm (7.4 in)
1930	185.4 mm (7.3 in)
1931	204.4 mm (8.0 in)
1932	202.3 mm (8.0 in)
1933	160.8 mm (6.3 in)
1934	208.0 mm (8.2 in)
1935	251.2 mm (9.9 in)
1936	100.3 mm (3.9 in)
1937	189.5 mm (7.5 in)
1938	107.4 mm (4.2 in)
1939	192.3 mm (7.6 in)
1940	161.3 mm (6.4 in)
1941	160.9 mm (6.3 in)
1965	167.2 mm (6.6 in)
1966	204.0 mm (8.0 in)
1967	211.8 mm (8.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at Lake Cowichan, 1924 to 1967. The record is 54 days in 1930, marked on the chart; the median year is 27 days.

Longest dry spell (CDD) at Lake Cowichan by year
Year	Longest dry spell (CDD)
1924	35 days
1925	30 days
1926	18 days
1927	25 days
1928	29 days
1929	41 days
1930	54 days
1931	27 days
1932	16 days
1933	24 days
1934	31 days
1935	24 days
1936	49 days
1937	42 days
1938	34 days
1939	39 days
1940	26 days
1941	16 days
1965	7 days
1966	10 days
1967	19 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.

Download the Data

Data for Lake Cowichan standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Lake Cowichan 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).