Chemainus Weather Records (CA001011500)

Record envelope, standing records and threshold days for Chemainus (CA001011500), British Columbia, Canada, with 106 years of record.

Key Facts for Chemainus

Chemainus (CA001011500) is a weather station in British Columbia, Canada at 48.93 latitude and -123.75 longitude, 75 m (246 ft) above sea level.
The station reports from 1919 to 2024, 106 years of record.
732 records set at Chemainus still stand.
Records are tracked for prcp, snow: an element needs 30 years of data to be eligible.
Chemainus set a daily record precipitation of 15.2 mm (0.6 in) on 7 September 1979.

About the Station

Location: British Columbia, Canada, 48.93 latitude, -123.75 longitude.
Elevation: 75 m (246 ft).
Period of record: 1919 to 2024, 106 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 Chemainus. 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 Chemainus, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	26.5 C (79.7 F)	4.0 C (39.2 F)	n/a	n/a
Jul	33.0 C (91.4 F)	5.0 C (41.0 F)	n/a	n/a
Aug	27.5 C (81.5 F)	9.0 C (48.2 F)	n/a	n/a
Sep	28.5 C (83.3 F)	5.0 C (41.0 F)	n/a	n/a
Oct	21.0 C (69.8 F)	1.0 C (33.8 F)	n/a	n/a
Nov	14.0 C (57.2 F)	-2.5 C (27.5 F)	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Which Years Hold Standing Records

732 standing records

732 records at Chemainus still stand. 1979 holds the most, with 732.

Wettest Day of Each Month

Jan: 95.8 mm (3.8 in)

The wettest day on record for each calendar month at Chemainus. The most was 95.8 mm (3.8 in) on 17 January 1941.

Record daily precipitation for each month at Chemainus
Month	Record daily precipitation (mm)	Date
Jan	95.8 mm (3.8 in)	17 January 1941
Feb	81.3 mm (3.2 in)	7 February 1945
Mar	79.0 mm (3.1 in)	19 March 1945
Apr	51.8 mm (2.0 in)	14 April 1937
May	61.5 mm (2.4 in)	28 May 1948
Jun	31.5 mm (1.2 in)	18 June 1929
Jul	39.1 mm (1.5 in)	16 July 1974
Aug	60.7 mm (2.4 in)	22 August 1975
Sep	65.0 mm (2.6 in)	21 September 1924
Oct	66.0 mm (2.6 in)	19 October 1956
Nov	72.4 mm (2.9 in)	2 November 1955
Dec	80.8 mm (3.2 in)	21 December 1967

Period of Record Coverage

1979 to 1979

1 years of record at Chemainus, 1979 to 1979. 1 years have data for under 90 percent of days and are left out of rankings: 1979.

Latest Records

Latest records at Chemainus
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
7 September 1979	Chemainus, CA	daily rain	15.2 mm (0.6 in)	1.2 mm (0.05 in)	20 years	13 of 100 (Routine)
4 September 1979	Chemainus, CA	daily rain	16.2 mm (0.6 in)	0.2 mm (0.01 in)	20 years	12 of 100 (Routine)
9 July 1979	Chemainus, CA	daily rain	6.8 mm (0.27 in)	2.5 mm (0.10 in)	4 years	12 of 100 (Routine)
30 June 1976	Chemainus, CA	daily rain	7.1 mm (0.28 in)	0.5 mm (0.02 in)	55 years	20 of 100 (Routine)
25 May 1976	Chemainus, CA	daily rain	10.9 mm (0.4 in)	1.2 mm (0.05 in)	3 years	7 of 100 (Routine)
23 March 1976	Chemainus, CA	daily rain	31.0 mm (1.2 in)	7.1 mm (0.28 in)	19 years	17 of 100 (Routine)
25 February 1976	Chemainus, CA	daily snowfall	8.4 cm (3.3 in)	8.4 cm (3.3 in)	56 years	29 of 100 (Routine)
26 January 1976	Chemainus, CA	daily rain	41.7 mm (1.6 in)	18.3 mm (0.7 in)	44 years	32 of 100 (Routine)
12 December 1975	Chemainus, CA	daily snowfall	13.0 cm (5.1 in)	4.1 cm (1.6 in)	13 years	14 of 100 (Routine)
3 December 1975	Chemainus, CA	daily rain	39.6 mm (1.6 in)	6.3 mm (0.25 in)	22 years	16 of 100 (Routine)
30 November 1975	Chemainus, CA	daily snowfall	1.8 cm (0.7 in)	1.8 cm (0.7 in)	56 years	20 of 100 (Routine)
29 November 1975	Chemainus, CA	daily snowfall	14.7 cm (5.8 in)	14.7 cm (5.8 in)	56 years	50 of 100 (Notable)
6 November 1975	Chemainus, CA	daily rain	39.9 mm (1.6 in)	4.1 mm (0.16 in)	44 years	21 of 100 (Routine)
16 October 1975	Chemainus, CA	daily rain	38.9 mm (1.5 in)	9.7 mm (0.38 in)	18 years	19 of 100 (Routine)
22 August 1975	Chemainus, CA	monthly rain	60.7 mm (2.4 in)	12.2 mm (0.5 in)	25 years	40 of 100 (Notable)
16 August 1975	Chemainus, CA	daily rain	8.9 mm (0.35 in)	4.3 mm (0.17 in)	2 years	11 of 100 (Routine)
7 August 1975	Chemainus, CA	daily rain	6.1 mm (0.24 in)	2.3 mm (0.09 in)	17 years	13 of 100 (Routine)
6 August 1975	Chemainus, CA	daily rain	5.8 mm (0.23 in)	1.2 mm (0.05 in)	17 years	11 of 100 (Routine)
26 June 1975	Chemainus, CA	daily rain	15.0 mm (0.6 in)	2.8 mm (0.11 in)	4 years	11 of 100 (Routine)
3 April 1975	Chemainus, CA	monthly snowfall	0.8 cm (0.3 in)	0.8 cm (0.3 in)	56 years	20 of 100 (Routine)

Extremes by Year

1919 to 1979

Yearly extremes at Chemainus: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	33.0 C (91.4 F)	1979	33.0 C (91.4 F)	1
Coldest night (TNn)	-2.5 C (27.5 F)	1979	-2.5 C (27.5 F)	1
Wettest day (Rx1day)	95.8 mm (3.8 in)	1941	55.4 mm (2.2 in)	59
Wettest five days (Rx5day)	237.4 mm (9.3 in)	1935	116.6 mm (4.6 in)	59
Longest dry spell (CDD)	79 days	1951	30 days	59

Hottest day (TXx)

The hottest day of the year at Chemainus, 1919 to 1979. The record is 33.0 C (91.4 F) in 1979, marked on the chart; the median year is 33.0 C (91.4 F).

Hottest day (TXx) at Chemainus by year
Year	Hottest day (TXx)
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1979	33.0 C (91.4 F)

Coldest night (TNn)

The coldest night of the year at Chemainus, 1919 to 1979. The record is -2.5 C (27.5 F) in 1979, marked on the chart; the median year is -2.5 C (27.5 F).

Coldest night (TNn) at Chemainus by year
Year	Coldest night (TNn)
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1979	-2.5 C (27.5 F)

Wettest day (Rx1day)

The wettest day of the year at Chemainus, 1919 to 1979. The record is 95.8 mm (3.8 in) in 1941, marked on the chart; the median year is 55.4 mm (2.2 in).

Wettest day (Rx1day) at Chemainus by year
Year	Wettest day (Rx1day)
1919	63.2 mm (2.5 in)
1920	46.0 mm (1.8 in)
1921	55.4 mm (2.2 in)
1922	43.2 mm (1.7 in)
1923	69.9 mm (2.8 in)
1924	68.1 mm (2.7 in)
1925	39.1 mm (1.5 in)
1926	55.4 mm (2.2 in)
1927	35.1 mm (1.4 in)
1928	35.3 mm (1.4 in)
1929	49.8 mm (2.0 in)
1930	47.0 mm (1.9 in)
1931	63.8 mm (2.5 in)
1932	48.3 mm (1.9 in)
1933	49.0 mm (1.9 in)
1934	57.4 mm (2.3 in)
1935	86.1 mm (3.4 in)
1936	60.2 mm (2.4 in)
1937	51.8 mm (2.0 in)
1938	38.9 mm (1.5 in)
1939	42.4 mm (1.7 in)
1940	40.9 mm (1.6 in)
1941	95.8 mm (3.8 in)
1942	38.1 mm (1.5 in)
1943	55.4 mm (2.2 in)
1944	51.1 mm (2.0 in)
1945	81.3 mm (3.2 in)
1946	40.9 mm (1.6 in)
1947	63.2 mm (2.5 in)
1948	71.4 mm (2.8 in)
1949	49.0 mm (1.9 in)
1950	67.3 mm (2.6 in)
1951	60.7 mm (2.4 in)
1952	36.8 mm (1.4 in)
1953	60.2 mm (2.4 in)
1954	71.9 mm (2.8 in)
1955	72.4 mm (2.9 in)
1956	66.0 mm (2.6 in)
1957	57.9 mm (2.3 in)
1958	64.3 mm (2.5 in)
1959	42.9 mm (1.7 in)
1960	68.6 mm (2.7 in)
1961	66.8 mm (2.6 in)
1962	52.6 mm (2.1 in)
1963	70.9 mm (2.8 in)
1964	56.6 mm (2.2 in)
1965	48.0 mm (1.9 in)
1966	54.4 mm (2.1 in)
1967	80.8 mm (3.2 in)
1968	82.6 mm (3.3 in)
1969	49.5 mm (1.9 in)
1970	48.8 mm (1.9 in)
1971	49.3 mm (1.9 in)
1972	78.2 mm (3.1 in)
1973	63.2 mm (2.5 in)
1974	57.2 mm (2.3 in)
1975	65.0 mm (2.6 in)
1976	41.7 mm (1.6 in)
1979	37.4 mm (1.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Chemainus, 1919 to 1979. The record is 237.4 mm (9.3 in) in 1935, marked on the chart; the median year is 116.6 mm (4.6 in).

Wettest five days (Rx5day) at Chemainus by year
Year	Wettest five days (Rx5day)
1919	140.5 mm (5.5 in)
1920	116.9 mm (4.6 in)
1921	168.7 mm (6.6 in)
1922	126.5 mm (5.0 in)
1923	122.4 mm (4.8 in)
1924	126.7 mm (5.0 in)
1925	94.3 mm (3.7 in)
1926	103.7 mm (4.1 in)
1927	114.1 mm (4.5 in)
1928	78.5 mm (3.1 in)
1929	114.3 mm (4.5 in)
1930	93.7 mm (3.7 in)
1931	133.6 mm (5.3 in)
1932	99.3 mm (3.9 in)
1933	90.6 mm (3.6 in)
1934	116.6 mm (4.6 in)
1935	237.4 mm (9.3 in)
1936	104.9 mm (4.1 in)
1937	129.0 mm (5.1 in)
1938	86.6 mm (3.4 in)
1939	128.8 mm (5.1 in)
1940	85.1 mm (3.4 in)
1941	103.4 mm (4.1 in)
1942	64.3 mm (2.5 in)
1943	92.2 mm (3.6 in)
1944	100.8 mm (4.0 in)
1945	118.4 mm (4.7 in)
1946	86.1 mm (3.4 in)
1947	135.9 mm (5.4 in)
1948	150.4 mm (5.9 in)
1949	106.7 mm (4.2 in)
1950	90.9 mm (3.6 in)
1951	119.7 mm (4.7 in)
1952	70.2 mm (2.8 in)
1953	115.0 mm (4.5 in)
1954	190.1 mm (7.5 in)
1955	123.2 mm (4.9 in)
1956	117.2 mm (4.6 in)
1957	134.9 mm (5.3 in)
1958	102.9 mm (4.1 in)
1959	115.8 mm (4.6 in)
1960	131.2 mm (5.2 in)
1961	133.4 mm (5.3 in)
1962	119.4 mm (4.7 in)
1963	142.7 mm (5.6 in)
1964	105.2 mm (4.1 in)
1965	87.9 mm (3.5 in)
1966	146.3 mm (5.8 in)
1967	135.2 mm (5.3 in)
1968	144.7 mm (5.7 in)
1969	118.9 mm (4.7 in)
1970	88.4 mm (3.5 in)
1971	98.1 mm (3.9 in)
1972	178.0 mm (7.0 in)
1973	142.5 mm (5.6 in)
1974	162.5 mm (6.4 in)
1975	114.0 mm (4.5 in)
1976	67.4 mm (2.7 in)
1979	89.8 mm (3.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Chemainus, 1919 to 1979. The record is 79 days in 1951, marked on the chart; the median year is 30 days.

Longest dry spell (CDD) at Chemainus by year
Year	Longest dry spell (CDD)
1919	25 days
1920	30 days
1921	18 days
1922	47 days
1923	42 days
1924	38 days
1925	30 days
1926	58 days
1927	30 days
1928	47 days
1929	23 days
1930	55 days
1931	43 days
1932	30 days
1933	31 days
1934	32 days
1935	24 days
1936	50 days
1937	43 days
1938	31 days
1939	39 days
1940	33 days
1941	27 days
1942	49 days
1943	33 days
1944	29 days
1945	34 days
1946	27 days
1947	24 days
1948	18 days
1949	19 days
1950	67 days
1951	79 days
1952	32 days
1953	24 days
1954	21 days
1955	23 days
1956	27 days
1957	19 days
1958	34 days
1959	27 days
1960	36 days
1961	38 days
1962	21 days
1963	22 days
1964	19 days
1965	27 days
1966	32 days
1967	42 days
1968	21 days
1969	27 days
1970	24 days
1971	20 days
1972	32 days
1973	21 days
1974	53 days
1975	32 days
1976	13 days
1979	36 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.

Rainfall Return Levels

53 years, 1919 to 1975

A day with at least 56.5 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 96.5 mm (3.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Chemainus: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	56.5 mm (2.2 in)
5 years	69.3 mm (2.7 in)
10 years	76.8 mm (3.0 in)
25 years	85.5 mm (3.4 in)
50 years	91.2 mm (3.6 in)
100 years	96.5 mm (3.8 in)	Longer than the 53 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, 53 years of values from 1919 to 1975.

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 1941; 86.1 mm (3.4 in) in 1935; 82.6 mm (3.3 in) in 1968.

Download the Data

Data for Chemainus standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Chemainus 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).