Nanaimo Departure Bay Weather Records (CA001025C70)

Record envelope, standing records and threshold days for Nanaimo Departure Bay (CA001025C70), British Columbia, Canada, with 80 years of record.

Key Facts for Nanaimo Departure Bay

Nanaimo Departure Bay (CA001025C70) is a weather station in British Columbia, Canada at 49.22 latitude and -123.95 longitude, 8 m (26 ft) above sea level.
The station reports from 1913 to 1992, 80 years of record.
1,464 records set at Nanaimo Departure Bay still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Nanaimo Departure Bay tied a daily record low maximum temperature of 0.0 C (32.0 F) on 27 December 1983.

About the Station

Location: British Columbia, Canada, 49.22 latitude, -123.95 longitude.
Elevation: 8 m (26 ft).
Period of record: 1913 to 1992, 80 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 Nanaimo Departure Bay. 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 Nanaimo Departure Bay, 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)	-13.9 C (7.0 F)	n/a	n/a
Feb	17.8 C (64.0 F)	-11.7 C (10.9 F)	n/a	n/a
Mar	22.2 C (72.0 F)	-8.3 C (17.1 F)	n/a	n/a
Apr	27.8 C (82.0 F)	-6.7 C (19.9 F)	n/a	n/a
May	30.6 C (87.1 F)	-1.1 C (30.0 F)	n/a	n/a
Jun	33.9 C (93.0 F)	1.7 C (35.1 F)	n/a	n/a
Jul	38.3 C (100.9 F)	4.4 C (39.9 F)	n/a	n/a
Aug	36.1 C (97.0 F)	1.1 C (34.0 F)	n/a	n/a
Sep	30.6 C (87.1 F)	1.1 C (34.0 F)	n/a	n/a
Oct	26.7 C (80.1 F)	-4.4 C (24.1 F)	n/a	n/a
Nov	19.4 C (66.9 F)	-9.4 C (15.1 F)	n/a	n/a
Dec	16.0 C (60.8 F)	-14.0 C (6.8 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Nanaimo Departure Bay still stand. 1929 holds the most, with 93.

Standing records at Nanaimo Departure Bay by the year they were set
Year set	Standing records
1913	16
1914	18
1915	7
1916	34
1917	30
1918	29
1919	31
1920	25
1921	17
1922	32
1923	20
1924	19
1925	7
1928	4
1929	93
1930	38
1931	17
1932	20
1933	21
1934	35
1935	28
1936	17
1937	6
1938	10
1939	29
1940	27
1941	54
1942	20
1943	9
1944	18
1945	18
1946	12
1947	30
1948	17
1949	36
1950	23
1951	35
1952	34
1953	20
1954	16
1955	34
1956	18
1957	10
1958	17
1960	20
1961	14
1962	22
1963	15
1964	13
1965	22
1966	18
1967	7
1968	30
1969	19
1970	14
1971	15
1972	21
1973	14
1974	12
1975	21
1976	18
1977	18
1978	18
1979	13
1980	13
1981	26
1982	17
1983	13

All-Time Record Progression

5 new records

5 all-time records were set at Nanaimo Departure Bay between 14 January 1950 and 9 August 1981. Each dot is a new record.

When Nanaimo Departure Bay set new all-time records
Date	Kind	Detail
1950-01-14	Record low maximum temperature	Record low maximum temperature -7.8 C (18.0 F)
1950-01-14	Record low minimum temperature	Record low minimum temperature -13.9 C (7.0 F)
1968-12-28	Record low maximum temperature	Record low maximum temperature -11.1 C (12.0 F)
1978-12-31	Record low minimum temperature	Record low minimum temperature -14.0 C (6.8 F)
1981-08-09	Record high minimum temperature	Record high minimum temperature 26.0 C (78.8 F)

Wettest Day of Each Month

Dec: 92.2 mm (3.6 in)

The wettest day on record for each calendar month at Nanaimo Departure Bay. The most was 92.2 mm (3.6 in) on 28 December 1937.

Record daily precipitation for each month at Nanaimo Departure Bay
Month	Record daily precipitation (mm)	Date
Jan	91.4 mm (3.6 in)	20 January 1935
Feb	55.0 mm (2.2 in)	10 February 1983
Mar	45.2 mm (1.8 in)	11 March 1971
Apr	35.3 mm (1.4 in)	3 April 1969
May	32.5 mm (1.3 in)	27 May 1948
Jun	32.3 mm (1.3 in)	24 June 1971
Jul	37.1 mm (1.5 in)	30 July 1935
Aug	52.1 mm (2.1 in)	27 August 1920
Sep	54.6 mm (2.1 in)	29 September 1953
Oct	63.0 mm (2.5 in)	28 October 1921
Nov	60.7 mm (2.4 in)	17 November 1954
Dec	92.2 mm (3.6 in)	28 December 1937

Period of Record Coverage

1913 to 1983

69 years of record at Nanaimo Departure Bay, 1913 to 1983. 5 years have data for under 90 percent of days and are left out of rankings: 1926, 1928, 1943, 1958, 1983.

Days with data per year at Nanaimo Departure Bay
Year	Days with data	Share of year	Complete
1913	365	100%	Yes
1914	364	100%	Yes
1915	365	100%	Yes
1916	366	100%	Yes
1917	365	100%	Yes
1918	365	100%	Yes
1919	365	100%	Yes
1920	365	100%	Yes
1921	363	99%	Yes
1922	336	92%	Yes
1923	365	100%	Yes
1924	366	100%	Yes
1925	365	100%	Yes
1926	31	8%	No
1928	133	36%	No
1929	347	95%	Yes
1930	365	100%	Yes
1931	359	98%	Yes
1932	360	98%	Yes
1933	365	100%	Yes
1934	364	100%	Yes
1935	362	99%	Yes
1936	357	98%	Yes
1937	365	100%	Yes
1938	365	100%	Yes
1939	365	100%	Yes
1940	365	100%	Yes
1941	346	95%	Yes
1942	365	100%	Yes
1943	292	80%	No
1944	361	99%	Yes
1945	365	100%	Yes
1946	365	100%	Yes
1947	365	100%	Yes
1948	366	100%	Yes
1949	365	100%	Yes
1950	363	99%	Yes
1951	364	100%	Yes
1952	355	97%	Yes
1953	359	98%	Yes
1954	359	98%	Yes
1955	360	99%	Yes
1956	363	99%	Yes
1957	365	100%	Yes
1958	181	50%	No
1960	361	99%	Yes
1961	362	99%	Yes
1962	359	98%	Yes
1963	350	96%	Yes
1964	343	94%	Yes
1965	349	96%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	355	97%	Yes
1969	365	100%	Yes
1970	360	99%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	355	97%	Yes
1975	363	99%	Yes
1976	360	98%	Yes
1977	342	94%	Yes
1978	364	100%	Yes
1979	353	97%	Yes
1980	331	90%	Yes
1981	362	99%	Yes
1982	362	99%	Yes
1983	75	21%	No

Latest Records

Latest records at Nanaimo Departure Bay
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
27 December 1983	Nanaimo Departure Bay, CA	daily low max (Tie)	0.0 C (32.0 F)	tie	48 years	5 of 100 (Routine)
24 December 1983	Nanaimo Departure Bay, CA	daily low min	-12.0 C (10.4 F)	2.0 C (3.6 F)	58 years	29 of 100 (Routine)
23 December 1983	Nanaimo Departure Bay, CA	daily low min	-12.0 C (10.4 F)	3.1 C (5.6 F)	58 years	33 of 100 (Routine)
23 December 1983	Nanaimo Departure Bay, CA	daily low max	-2.5 C (27.5 F)	3.1 C (5.6 F)	18 years	22 of 100 (Routine)
22 December 1983	Nanaimo Departure Bay, CA	daily low max	-2.5 C (27.5 F)	2.5 C (4.5 F)	14 years	19 of 100 (Routine)
21 December 1983	Nanaimo Departure Bay, CA	daily low max	-2.5 C (27.5 F)	3.6 C (6.5 F)	61 years	36 of 100 (Notable)
20 December 1983	Nanaimo Departure Bay, CA	daily low min	-8.0 C (17.6 F)	1.3 C (2.3 F)	61 years	28 of 100 (Routine)
20 December 1983	Nanaimo Departure Bay, CA	daily low max	-4.5 C (23.9 F)	3.9 C (7.0 F)	16 years	23 of 100 (Routine)
23 February 1983	Nanaimo Departure Bay, CA	daily high min	9.0 C (48.2 F)	1.2 C (2.2 F)	24 years	17 of 100 (Routine)
19 February 1983	Nanaimo Departure Bay, CA	daily rain	37.4 mm (1.5 in)	21.9 mm (0.9 in)	65 years	52 of 100 (Notable)
13 February 1983	Nanaimo Departure Bay, CA	daily high max	12.0 C (53.6 F)	0.3 C (0.5 F)	25 years	14 of 100 (Routine)
12 February 1983	Nanaimo Departure Bay, CA	daily high min	8.5 C (47.3 F)	0.2 C (0.4 F)	41 years	19 of 100 (Routine)
10 February 1983	Nanaimo Departure Bay, CA	monthly rain	55.0 mm (2.2 in)	0.6 mm (0.02 in)	65 years	36 of 100 (Notable)
26 January 1983	Nanaimo Departure Bay, CA	daily high min	7.0 C (44.6 F)	0.9 C (1.6 F)	60 years	27 of 100 (Routine)
25 January 1983	Nanaimo Departure Bay, CA	daily high min	6.0 C (42.8 F)	0.4 C (0.7 F)	60 years	26 of 100 (Routine)
12 January 1983	Nanaimo Departure Bay, CA	daily high min	7.0 C (44.6 F)	0.3 C (0.5 F)	52 years	22 of 100 (Routine)
18 December 1982	Nanaimo Departure Bay, CA	daily rain	42.4 mm (1.7 in)	7.9 mm (0.31 in)	9 years	17 of 100 (Routine)
2 December 1982	Nanaimo Departure Bay, CA	daily rain	41.6 mm (1.6 in)	11.1 mm (0.4 in)	36 years	30 of 100 (Routine)
25 November 1982	Nanaimo Departure Bay, CA	daily low min	-3.0 C (26.6 F)	0.8 C (1.4 F)	25 years	16 of 100 (Routine)
24 November 1982	Nanaimo Departure Bay, CA	daily low min	-3.0 C (26.6 F)	0.2 C (0.4 F)	20 years	13 of 100 (Routine)

Climate Trend

58 complete years, 1914 to 1982

One stripe for each of 58 complete years at Nanaimo Departure Bay, 1914 to 1982. Blue stripes are years cooler than the station's own mean of 10.2 C (50.4 F); red stripes are warmer. The coolest year was 1916, at 8.3 C (47.0 F), and the warmest was 1940, at 12.0 C (53.6 F). The strongest colour marks a difference of 2.0 C (3.6 F).

Annual mean temperature at Nanaimo Departure Bay as warming stripes, 1914 to 1982
Year	Annual mean temperature	Difference from the station mean
1914	10.1 C	-0.15 C
1915	10.5 C	+0.27 C
1916	8.3 C	-1.90 C
1917	9.3 C	-0.93 C
1918	10.4 C	+0.17 C
1919	9.5 C	-0.73 C
1920	9.5 C	-0.70 C
1921	9.4 C	-0.82 C
1923	10.3 C	+0.08 C
1924	10.0 C	-0.17 C
1925	10.6 C	+0.36 C
1930	8.8 C	-1.37 C
1931	10.7 C	+0.45 C
1932	10.1 C	-0.15 C
1933	9.3 C	-0.92 C
1934	11.8 C	+1.58 C
1935	9.8 C	-0.39 C
1936	10.3 C	+0.08 C
1937	10.1 C	-0.16 C
1938	10.9 C	+0.64 C
1939	11.0 C	+0.75 C
1940	12.0 C	+1.79 C
1944	10.8 C	+0.58 C
1945	10.5 C	+0.30 C
1946	10.2 C	-0.04 C
1947	11.4 C	+1.20 C
1948	10.4 C	+0.20 C
1949	10.8 C	+0.56 C
1950	10.2 C	-0.06 C
1951	11.1 C	+0.90 C
1952	11.2 C	+0.97 C
1953	11.3 C	+1.11 C
1954	10.3 C	+0.09 C
1955	9.4 C	-0.81 C
1956	10.3 C	+0.13 C
1957	10.7 C	+0.48 C
1960	10.4 C	+0.21 C
1961	11.0 C	+0.74 C
1962	10.5 C	+0.27 C
1963	10.6 C	+0.34 C
1964	9.4 C	-0.81 C
1965	10.5 C	+0.25 C
1966	10.0 C	-0.25 C
1967	10.8 C	+0.55 C
1968	9.5 C	-0.70 C
1969	9.4 C	-0.78 C
1970	9.6 C	-0.63 C
1971	9.9 C	-0.35 C
1972	9.9 C	-0.30 C
1973	10.0 C	-0.25 C
1974	10.3 C	+0.08 C
1975	9.6 C	-0.57 C
1976	9.9 C	-0.31 C
1978	10.1 C	-0.09 C
1979	10.3 C	+0.07 C
1980	9.7 C	-0.51 C
1981	10.5 C	+0.32 C
1982	9.7 C	-0.49 C

The fitted trend in annual mean temperature here over 1914 to 1982 is 0.02 C (-0.07 to 0.11) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.03 F (-0.13 to 0.19) per decade. The slope is a straight line fitted to 58 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Nanaimo Departure Bay
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.02 C (-0.07 to 0.11) per decade	0.03 F (-0.13 to 0.19) per decade	1914 to 1982	58	Not clearly different from zero
Mean daily maximum	-0.09 C (-0.21 to 0.03) per decade	-0.2 F (-0.4 to 0.1) per decade	1914 to 1982	58	Not clearly different from zero
Mean daily minimum	0.12 C (0.04 to 0.21) per decade	0.2 F (0.1 to 0.4) per decade	1914 to 1982	58	Rise

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

1913 to 1983

Yearly extremes at Nanaimo Departure Bay: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	38.3 C (100.9 F)	1941	31.7 C (89.1 F)	69
Coldest night (TNn)	-14.0 C (6.8 F)	1978	-6.7 C (19.9 F)	69
Wettest day (Rx1day)	92.2 mm (3.6 in)	1937	40.6 mm (1.6 in)	69
Wettest five days (Rx5day)	152.9 mm (6.0 in)	1937	81.0 mm (3.2 in)	69
Longest dry spell (CDD)	57 days	1930	26 days	69

Hottest day (TXx)

The hottest day of the year at Nanaimo Departure Bay, 1913 to 1983. The record is 38.3 C (100.9 F) in 1941, marked on the chart; the median year is 31.7 C (89.1 F).

Hottest day (TXx) at Nanaimo Departure Bay by year
Year	Hottest day (TXx)
1913	32.2 C (90.0 F)
1914	30.0 C (86.0 F)
1915	35.0 C (95.0 F)
1916	31.7 C (89.1 F)
1917	30.0 C (86.0 F)
1918	31.1 C (88.0 F)
1919	30.0 C (86.0 F)
1920	32.2 C (90.0 F)
1921	30.0 C (86.0 F)
1922	31.7 C (89.1 F)
1923	31.7 C (89.1 F)
1924	33.3 C (91.9 F)
1925	31.1 C (88.0 F)
1926	8.9 C (48.0 F)
1928	30.0 C (86.0 F)
1929	29.4 C (84.9 F)
1930	30.0 C (86.0 F)
1931	31.7 C (89.1 F)
1932	33.3 C (91.9 F)
1933	33.3 C (91.9 F)
1934	31.1 C (88.0 F)
1935	35.6 C (96.1 F)
1936	28.9 C (84.0 F)
1937	32.8 C (91.0 F)
1938	33.3 C (91.9 F)
1939	36.1 C (97.0 F)
1940	32.2 C (90.0 F)
1941	38.3 C (100.9 F)
1942	33.9 C (93.0 F)
1943	30.0 C (86.0 F)
1944	35.6 C (96.1 F)
1945	32.2 C (90.0 F)
1946	30.0 C (86.0 F)
1947	30.6 C (87.1 F)
1948	30.6 C (87.1 F)
1949	31.1 C (88.0 F)
1950	31.7 C (89.1 F)
1951	36.1 C (97.0 F)
1952	34.4 C (93.9 F)
1953	32.2 C (90.0 F)
1954	27.2 C (81.0 F)
1955	30.0 C (86.0 F)
1956	33.9 C (93.0 F)
1957	30.0 C (86.0 F)
1958	31.1 C (88.0 F)
1960	32.8 C (91.0 F)
1961	34.4 C (93.9 F)
1962	29.4 C (84.9 F)
1963	29.4 C (84.9 F)
1964	26.7 C (80.1 F)
1965	35.0 C (95.0 F)
1966	31.7 C (89.1 F)
1967	32.2 C (90.0 F)
1968	31.1 C (88.0 F)
1969	33.9 C (93.0 F)
1970	32.8 C (91.0 F)
1971	33.3 C (91.9 F)
1972	32.2 C (90.0 F)
1973	30.0 C (86.0 F)
1974	32.8 C (91.0 F)
1975	31.1 C (88.0 F)
1976	26.7 C (80.1 F)
1977	32.8 C (91.0 F)
1978	34.5 C (94.1 F)
1979	32.5 C (90.5 F)
1980	30.0 C (86.0 F)
1981	35.0 C (95.0 F)
1982	33.0 C (91.4 F)
1983	12.0 C (53.6 F)

Coldest night (TNn)

The coldest night of the year at Nanaimo Departure Bay, 1913 to 1983. The record is -14.0 C (6.8 F) in 1978, marked on the chart; the median year is -6.7 C (19.9 F).

Coldest night (TNn) at Nanaimo Departure Bay by year
Year	Coldest night (TNn)
1913	-7.2 C (19.0 F)
1914	-5.6 C (21.9 F)
1915	-4.4 C (24.1 F)
1916	-11.7 C (10.9 F)
1917	-10.6 C (12.9 F)
1918	-6.7 C (19.9 F)
1919	-11.1 C (12.0 F)
1920	-6.1 C (21.0 F)
1921	-6.7 C (19.9 F)
1922	-8.9 C (16.0 F)
1923	-9.4 C (15.1 F)
1924	-10.0 C (14.0 F)
1925	-2.8 C (27.0 F)
1926	-1.1 C (30.0 F)
1928	0.0 C (32.0 F)
1929	-12.2 C (10.0 F)
1930	-12.2 C (10.0 F)
1931	-2.8 C (27.0 F)
1932	-7.8 C (18.0 F)
1933	-6.1 C (21.0 F)
1934	-1.7 C (28.9 F)
1935	-8.9 C (16.0 F)
1936	-8.9 C (16.0 F)
1937	-7.8 C (18.0 F)
1938	-1.7 C (28.9 F)
1939	-3.9 C (25.0 F)
1940	-1.7 C (28.9 F)
1941	-6.7 C (19.9 F)
1942	-6.7 C (19.9 F)
1943	-0.6 C (30.9 F)
1944	-5.0 C (23.0 F)
1945	-3.9 C (25.0 F)
1946	-2.8 C (27.0 F)
1947	-8.3 C (17.1 F)
1948	-6.1 C (21.0 F)
1949	-7.8 C (18.0 F)
1950	-13.9 C (7.0 F)
1951	-8.3 C (17.1 F)
1952	-4.4 C (24.1 F)
1953	-1.7 C (28.9 F)
1954	-6.7 C (19.9 F)
1955	-9.4 C (15.1 F)
1956	-8.3 C (17.1 F)
1957	-11.7 C (10.9 F)
1958	-0.6 C (30.9 F)
1960	-6.1 C (21.0 F)
1961	-3.9 C (25.0 F)
1962	-7.8 C (18.0 F)
1963	-8.3 C (17.1 F)
1964	-12.2 C (10.0 F)
1965	-3.9 C (25.0 F)
1966	-3.9 C (25.0 F)
1967	-2.8 C (27.0 F)
1968	-12.2 C (10.0 F)
1969	-13.3 C (8.1 F)
1970	-7.2 C (19.0 F)
1971	-7.2 C (19.0 F)
1972	-7.8 C (18.0 F)
1973	-11.1 C (12.0 F)
1974	-5.6 C (21.9 F)
1975	-3.9 C (25.0 F)
1976	-4.4 C (24.1 F)
1977	-6.7 C (19.9 F)
1978	-14.0 C (6.8 F)
1979	-10.0 C (14.0 F)
1980	-9.0 C (15.8 F)
1981	-6.0 C (21.2 F)
1982	-7.0 C (19.4 F)
1983	-12.0 C (10.4 F)

Wettest day (Rx1day)

The wettest day of the year at Nanaimo Departure Bay, 1913 to 1983. The record is 92.2 mm (3.6 in) in 1937, marked on the chart; the median year is 40.6 mm (1.6 in).

Wettest day (Rx1day) at Nanaimo Departure Bay by year
Year	Wettest day (Rx1day)
1913	36.1 mm (1.4 in)
1914	48.0 mm (1.9 in)
1915	30.2 mm (1.2 in)
1916	41.7 mm (1.6 in)
1917	31.2 mm (1.2 in)
1918	59.9 mm (2.4 in)
1919	34.8 mm (1.4 in)
1920	52.1 mm (2.1 in)
1921	63.0 mm (2.5 in)
1922	32.3 mm (1.3 in)
1923	56.1 mm (2.2 in)
1924	38.4 mm (1.5 in)
1925	38.4 mm (1.5 in)
1926	23.6 mm (0.9 in)
1928	18.3 mm (0.7 in)
1929	50.8 mm (2.0 in)
1930	40.6 mm (1.6 in)
1931	44.7 mm (1.8 in)
1932	35.8 mm (1.4 in)
1933	39.9 mm (1.6 in)
1934	40.1 mm (1.6 in)
1935	91.4 mm (3.6 in)
1936	35.1 mm (1.4 in)
1937	92.2 mm (3.6 in)
1938	24.9 mm (1.0 in)
1939	45.5 mm (1.8 in)
1940	43.4 mm (1.7 in)
1941	52.3 mm (2.1 in)
1942	19.1 mm (0.8 in)
1943	27.9 mm (1.1 in)
1944	54.6 mm (2.1 in)
1945	34.8 mm (1.4 in)
1946	29.5 mm (1.2 in)
1947	40.9 mm (1.6 in)
1948	48.8 mm (1.9 in)
1949	53.3 mm (2.1 in)
1950	45.7 mm (1.8 in)
1951	40.6 mm (1.6 in)
1952	34.8 mm (1.4 in)
1953	54.6 mm (2.1 in)
1954	60.7 mm (2.4 in)
1955	40.9 mm (1.6 in)
1956	40.4 mm (1.6 in)
1957	31.2 mm (1.2 in)
1958	67.1 mm (2.6 in)
1960	58.7 mm (2.3 in)
1961	38.6 mm (1.5 in)
1962	31.5 mm (1.2 in)
1963	33.8 mm (1.3 in)
1964	57.2 mm (2.3 in)
1965	44.5 mm (1.8 in)
1966	36.1 mm (1.4 in)
1967	56.4 mm (2.2 in)
1968	48.5 mm (1.9 in)
1969	53.1 mm (2.1 in)
1970	35.3 mm (1.4 in)
1971	45.2 mm (1.8 in)
1972	38.6 mm (1.5 in)
1973	36.3 mm (1.4 in)
1974	34.8 mm (1.4 in)
1975	45.5 mm (1.8 in)
1976	30.7 mm (1.2 in)
1977	28.4 mm (1.1 in)
1978	34.0 mm (1.3 in)
1979	39.8 mm (1.6 in)
1980	36.6 mm (1.4 in)
1981	47.0 mm (1.9 in)
1982	42.4 mm (1.7 in)
1983	55.0 mm (2.2 in)

Wettest five days (Rx5day)

The wettest five days of the year at Nanaimo Departure Bay, 1913 to 1983. The record is 152.9 mm (6.0 in) in 1937, marked on the chart; the median year is 81.0 mm (3.2 in).

Wettest five days (Rx5day) at Nanaimo Departure Bay by year
Year	Wettest five days (Rx5day)
1913	75.9 mm (3.0 in)
1914	114.1 mm (4.5 in)
1915	82.1 mm (3.2 in)
1916	99.0 mm (3.9 in)
1917	78.4 mm (3.1 in)
1918	97.8 mm (3.9 in)
1919	84.7 mm (3.3 in)
1920	77.0 mm (3.0 in)
1921	127.2 mm (5.0 in)
1922	81.4 mm (3.2 in)
1923	100.0 mm (3.9 in)
1924	72.4 mm (2.9 in)
1925	78.0 mm (3.1 in)
1926	29.9 mm (1.2 in)
1928	40.1 mm (1.6 in)
1929	81.7 mm (3.2 in)
1930	77.5 mm (3.1 in)
1931	80.3 mm (3.2 in)
1932	65.6 mm (2.6 in)
1933	94.2 mm (3.7 in)
1934	81.0 mm (3.2 in)
1935	113.5 mm (4.5 in)
1936	56.7 mm (2.2 in)
1937	152.9 mm (6.0 in)
1938	108.2 mm (4.3 in)
1939	102.4 mm (4.0 in)
1940	59.5 mm (2.3 in)
1941	81.5 mm (3.2 in)
1942	51.0 mm (2.0 in)
1943	53.3 mm (2.1 in)
1944	77.7 mm (3.1 in)
1945	90.2 mm (3.6 in)
1946	73.7 mm (2.9 in)
1947	83.6 mm (3.3 in)
1948	86.2 mm (3.4 in)
1949	105.7 mm (4.2 in)
1950	74.4 mm (2.9 in)
1951	94.5 mm (3.7 in)
1952	75.5 mm (3.0 in)
1953	90.6 mm (3.6 in)
1954	130.0 mm (5.1 in)
1955	86.3 mm (3.4 in)
1956	95.2 mm (3.7 in)
1957	70.2 mm (2.8 in)
1958	100.5 mm (4.0 in)
1960	96.1 mm (3.8 in)
1961	57.8 mm (2.3 in)
1962	54.4 mm (2.1 in)
1963	68.9 mm (2.7 in)
1964	68.6 mm (2.7 in)
1965	71.9 mm (2.8 in)
1966	60.8 mm (2.4 in)
1967	73.4 mm (2.9 in)
1968	54.9 mm (2.2 in)
1969	83.7 mm (3.3 in)
1970	60.7 mm (2.4 in)
1971	74.1 mm (2.9 in)
1972	103.2 mm (4.1 in)
1973	95.3 mm (3.8 in)
1974	90.7 mm (3.6 in)
1975	78.6 mm (3.1 in)
1976	42.3 mm (1.7 in)
1977	68.5 mm (2.7 in)
1978	47.1 mm (1.9 in)
1979	66.4 mm (2.6 in)
1980	87.1 mm (3.4 in)
1981	82.9 mm (3.3 in)
1982	114.1 mm (4.5 in)
1983	92.6 mm (3.6 in)

Longest dry spell (CDD)

The longest dry spell of the year at Nanaimo Departure Bay, 1913 to 1983. The record is 57 days in 1930, marked on the chart; the median year is 26 days.

Longest dry spell (CDD) at Nanaimo Departure Bay by year
Year	Longest dry spell (CDD)
1913	32 days
1914	27 days
1915	26 days
1916	27 days
1917	22 days
1918	38 days
1919	25 days
1920	30 days
1921	19 days
1922	44 days
1923	41 days
1924	33 days
1925	29 days
1926	11 days
1928	12 days
1929	42 days
1930	57 days
1931	43 days
1932	28 days
1933	25 days
1934	30 days
1935	26 days
1936	46 days
1937	26 days
1938	34 days
1939	39 days
1940	32 days
1941	25 days
1942	41 days
1943	31 days
1944	25 days
1945	30 days
1946	25 days
1947	22 days
1948	16 days
1949	17 days
1950	30 days
1951	26 days
1952	41 days
1953	21 days
1954	22 days
1955	23 days
1956	35 days
1957	19 days
1958	21 days
1960	31 days
1961	25 days
1962	26 days
1963	24 days
1964	20 days
1965	27 days
1966	19 days
1967	42 days
1968	21 days
1969	23 days
1970	25 days
1971	20 days
1972	29 days
1973	22 days
1974	48 days
1975	34 days
1976	13 days
1977	35 days
1978	17 days
1979	33 days
1980	15 days
1981	22 days
1982	19 days
1983	7 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

58 years with a frost

Across 58 years with a frost, the median last spring frost at Nanaimo Departure Bay falls on 5 April and the median first autumn frost on 11 November, which leaves a median of 216 days between them.

Fitted over all years, the growing season changes by +1.0 days per decade at this station.

Frost dates and growing season at Nanaimo Departure Bay
Measure	Median, all years	Earliest period	Recent period (1950 to 1982)	Recent against earliest	Fitted trend
Last spring frost	5 April	n/a	7 April	n/a	-0.6 days per decade
First autumn frost	11 November	n/a	11 November	n/a	+0.4 days per decade
Growing days	216 days	n/a	216 days	n/a	+1.0 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

55 years, 1913 to 1982

A day with at least 39.9 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 88.7 mm (3.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Nanaimo Departure Bay: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	39.9 mm (1.6 in)
5 years	51.0 mm (2.0 in)
10 years	59.0 mm (2.3 in)
25 years	70.1 mm (2.8 in)
50 years	79.1 mm (3.1 in)
100 years	88.7 mm (3.5 in)	Longer than the 55 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, 55 years of values from 1913 to 1982.

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: 92.2 mm (3.6 in) in 1937; 91.4 mm (3.6 in) in 1935; 63.0 mm (2.5 in) in 1921.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Download the Data

Data for Nanaimo Departure Bay standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Nanaimo Departure Bay 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.

Data as of 2026-10-14. Last revised 14 October 2026 (2026-10-14).