Nanaimo Weather Records (CA001025340)

Record envelope, standing records and threshold days for Nanaimo (CA001025340), British Columbia, Canada, with 77 years of record.

Key Facts for Nanaimo

Nanaimo (CA001025340) is a weather station in British Columbia, Canada at 49.18 latitude and -123.97 longitude, 70 m (230 ft) above sea level.
The station reports from 1892 to 1968, 77 years of record.
1,464 records set at Nanaimo still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Nanaimo set a daily record precipitation of 9.9 mm (0.39 in) on 19 May 1968.

About the Station

Location: British Columbia, Canada, 49.18 latitude, -123.97 longitude.
Elevation: 70 m (230 ft).
Period of record: 1892 to 1968, 77 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. 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, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	16.1 C (61.0 F)	-18.3 C (-0.9 F)	n/a	n/a
Feb	18.3 C (64.9 F)	-17.2 C (1.0 F)	n/a	n/a
Mar	21.7 C (71.1 F)	-11.1 C (12.0 F)	n/a	n/a
Apr	27.8 C (82.0 F)	-3.9 C (25.0 F)	n/a	n/a
May	31.7 C (89.1 F)	-2.8 C (27.0 F)	n/a	n/a
Jun	33.3 C (91.9 F)	0.6 C (33.1 F)	n/a	n/a
Jul	40.6 C (105.1 F)	4.4 C (39.9 F)	n/a	n/a
Aug	35.6 C (96.1 F)	3.3 C (37.9 F)	n/a	n/a
Sep	30.6 C (87.1 F)	-1.1 C (30.0 F)	n/a	n/a
Oct	25.0 C (77.0 F)	-6.7 C (19.9 F)	n/a	n/a
Nov	17.8 C (64.0 F)	-11.7 C (10.9 F)	n/a	n/a
Dec	15.0 C (59.0 F)	-12.2 C (10.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Nanaimo still stand. 1909 holds the most, with 44.

Standing records at Nanaimo by the year they were set
Year set	Standing records
1892	22
1893	32
1901	30
1902	27
1903	26
1904	28
1905	33
1906	31
1907	16
1908	28
1909	44
1910	15
1911	20
1912	14
1913	21
1914	17
1915	19
1916	18
1917	23
1918	25
1919	36
1920	21
1921	10
1922	26
1923	18
1924	27
1925	13
1926	29
1927	16
1928	13
1929	17
1930	16
1931	20
1932	21
1933	12
1934	24
1935	34
1936	30
1937	11
1938	13
1939	19
1940	11
1941	25
1942	24
1943	26
1944	22
1945	19
1946	17
1947	20
1948	21
1949	24
1950	25
1951	22
1952	24
1953	5
1954	14
1955	35
1956	17
1957	7
1958	37
1959	7
1960	13
1961	16
1962	19
1963	21
1964	10
1965	30
1966	16
1967	12
1968	10

All-Time Record Progression

3 new records

3 all-time records were set at Nanaimo between 14 July 1941 and 16 July 1941. Each dot is a new record.

When Nanaimo set new all-time records
Date	Kind	Detail
1941-07-14	Record high maximum temperature	Record high maximum temperature 35.6 C (96.1 F)
1941-07-15	Record high maximum temperature	Record high maximum temperature 37.8 C (100.0 F)
1941-07-16	Record high maximum temperature	Record high maximum temperature 40.6 C (105.1 F)

Wettest Day of Each Month

Feb: 76.2 mm (3.0 in)

The wettest day on record for each calendar month at Nanaimo. The most was 76.2 mm (3.0 in) on 14 February 1923.

Record daily precipitation for each month at Nanaimo
Month	Record daily precipitation (mm)	Date
Jan	71.6 mm (2.8 in)	20 January 1935
Feb	76.2 mm (3.0 in)	14 February 1923
Mar	43.4 mm (1.7 in)	29 March 1959
Apr	35.6 mm (1.4 in)	12 April 1937
May	43.2 mm (1.7 in)	20 May 1912
Jun	31.8 mm (1.3 in)	22 June 1955
Jul	31.8 mm (1.3 in)	30 July 1935
Aug	51.3 mm (2.0 in)	27 August 1920
Sep	47.0 mm (1.9 in)	7 September 1905
Oct	69.6 mm (2.7 in)	28 October 1921
Nov	69.9 mm (2.8 in)	28 November 1909
Dec	65.0 mm (2.6 in)	3 December 1918

Period of Record Coverage

1892 to 1968

70 years of record at Nanaimo, 1892 to 1968. 6 years have data for under 90 percent of days and are left out of rankings: 1893, 1901, 1913, 1963, 1964, 1968.

Days with data per year at Nanaimo
Year	Days with data	Share of year	Complete
1892	333	91%	Yes
1893	208	57%	No
1901	306	84%	No
1902	365	100%	Yes
1903	365	100%	Yes
1904	365	100%	Yes
1905	359	98%	Yes
1906	364	100%	Yes
1907	364	100%	Yes
1908	364	99%	Yes
1909	364	100%	Yes
1910	363	99%	Yes
1911	339	93%	Yes
1912	343	94%	Yes
1913	294	81%	No
1914	365	100%	Yes
1915	361	99%	Yes
1916	360	98%	Yes
1917	363	99%	Yes
1918	364	100%	Yes
1919	361	99%	Yes
1920	366	100%	Yes
1921	365	100%	Yes
1922	365	100%	Yes
1923	365	100%	Yes
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	365	100%	Yes
1936	366	100%	Yes
1937	365	100%	Yes
1938	365	100%	Yes
1939	365	100%	Yes
1940	366	100%	Yes
1941	365	100%	Yes
1942	365	100%	Yes
1943	365	100%	Yes
1944	366	100%	Yes
1945	365	100%	Yes
1946	365	100%	Yes
1947	365	100%	Yes
1948	366	100%	Yes
1949	365	100%	Yes
1950	365	100%	Yes
1951	365	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	365	100%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	300	82%	No
1964	254	69%	No
1965	359	98%	Yes
1966	331	91%	Yes
1967	365	100%	Yes
1968	152	42%	No

Latest Records

Latest records at Nanaimo
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
19 May 1968	Nanaimo, CA	daily rain	9.9 mm (0.39 in)	1.0 mm (0.04 in)	16 years	13 of 100 (Routine)
10 May 1968	Nanaimo, CA	daily high max	25.6 C (78.1 F)	1.7 C (3.1 F)	22 years	17 of 100 (Routine)
9 May 1968	Nanaimo, CA	daily high max	24.4 C (75.9 F)	0.5 C (0.9 F)	62 years	26 of 100 (Routine)
21 April 1968	Nanaimo, CA	daily low min	-2.8 C (27.0 F)	1.7 C (3.1 F)	17 years	17 of 100 (Routine)
16 April 1968	Nanaimo, CA	daily low min	-1.7 C (28.9 F)	0.6 C (1.1 F)	67 years	29 of 100 (Routine)
15 April 1968	Nanaimo, CA	daily low min (Tie)	-1.1 C (30.0 F)	tie	60 years	6 of 100 (Routine)
11 April 1968	Nanaimo, CA	daily low min (Tie)	-2.2 C (28.0 F)	tie	65 years	6 of 100 (Routine)
28 February 1968	Nanaimo, CA	daily high max	16.7 C (62.1 F)	2.3 C (4.1 F)	8 years	16 of 100 (Routine)
27 February 1968	Nanaimo, CA	monthly high max (Tie)	18.3 C (64.9 F)	tie	0 years	4 of 100 (Routine)
26 February 1968	Nanaimo, CA	monthly high max	18.3 C (64.9 F)	2.2 C (4.0 F)	52 years	39 of 100 (Notable)
25 February 1968	Nanaimo, CA	daily high max	15.0 C (59.0 F)	1.1 C (2.0 F)	36 years	20 of 100 (Routine)
23 January 1968	Nanaimo, CA	daily high max	11.1 C (52.0 F)	0.5 C (0.9 F)	74 years	30 of 100 (Routine)
18 January 1968	Nanaimo, CA	daily rain	37.1 mm (1.5 in)	5.3 mm (0.21 in)	42 years	25 of 100 (Routine)
17 January 1968	Nanaimo, CA	daily rain	47.8 mm (1.9 in)	13.0 mm (0.5 in)	49 years	35 of 100 (Notable)
13 January 1968	Nanaimo, CA	daily high max	12.2 C (54.0 F)	1.1 C (2.0 F)	48 years	24 of 100 (Routine)
11 January 1968	Nanaimo, CA	daily rain	45.7 mm (1.8 in)	22.1 mm (0.9 in)	33 years	42 of 100 (Notable)
7 January 1968	Nanaimo, CA	daily rain	34.8 mm (1.4 in)	13.0 mm (0.5 in)	64 years	40 of 100 (Notable)
30 November 1967	Nanaimo, CA	daily low min	-2.2 C (28.0 F)	0.5 C (0.9 F)	20 years	14 of 100 (Routine)
5 November 1967	Nanaimo, CA	daily low min	-2.8 C (27.0 F)	0.6 C (1.1 F)	57 years	25 of 100 (Routine)
3 November 1967	Nanaimo, CA	daily low min	-3.9 C (25.0 F)	0.6 C (1.1 F)	32 years	17 of 100 (Routine)

Climate Trend

60 complete years, 1902 to 1967

One stripe for each of 60 complete years at Nanaimo, 1902 to 1967. Blue stripes are years cooler than the station's own mean of 10.0 C (49.9 F); red stripes are warmer. The coolest year was 1955, at 8.3 C (46.9 F), and the warmest was 1958, at 11.6 C (52.9 F). The strongest colour marks a difference of 1.7 C (3.1 F).

Annual mean temperature at Nanaimo as warming stripes, 1902 to 1967
Year	Annual mean temperature	Difference from the station mean
1902	9.4 C	-0.56 C
1903	9.0 C	-0.99 C
1904	9.6 C	-0.33 C
1905	9.6 C	-0.32 C
1906	10.0 C	0.00 C
1907	9.4 C	-0.55 C
1908	9.5 C	-0.51 C
1909	8.3 C	-1.64 C
1910	9.2 C	-0.75 C
1914	10.3 C	+0.31 C
1915	10.7 C	+0.78 C
1916	8.8 C	-1.15 C
1917	9.8 C	-0.12 C
1918	10.6 C	+0.64 C
1919	9.6 C	-0.36 C
1920	9.8 C	-0.13 C
1921	9.5 C	-0.44 C
1922	9.5 C	-0.48 C
1923	10.3 C	+0.35 C
1924	10.2 C	+0.24 C
1925	10.9 C	+0.91 C
1926	11.3 C	+1.31 C
1927	9.9 C	-0.05 C
1928	10.8 C	+0.80 C
1929	9.8 C	-0.19 C
1930	9.9 C	-0.06 C
1931	10.7 C	+0.72 C
1932	10.0 C	+0.08 C
1933	10.0 C	+0.03 C
1934	11.4 C	+1.47 C
1935	10.2 C	+0.27 C
1936	10.5 C	+0.54 C
1937	10.2 C	+0.22 C
1938	10.4 C	+0.47 C
1939	10.6 C	+0.60 C
1940	11.1 C	+1.14 C
1941	10.9 C	+0.98 C
1942	10.4 C	+0.43 C
1943	9.6 C	-0.37 C
1944	10.2 C	+0.23 C
1945	9.9 C	-0.02 C
1946	9.6 C	-0.36 C
1947	10.0 C	+0.07 C
1948	9.2 C	-0.77 C
1949	9.3 C	-0.66 C
1950	8.9 C	-1.07 C
1951	9.8 C	-0.15 C
1952	10.0 C	+0.04 C
1953	10.2 C	+0.21 C
1954	9.3 C	-0.69 C
1955	8.3 C	-1.69 C
1956	9.3 C	-0.65 C
1957	9.7 C	-0.30 C
1958	11.6 C	+1.64 C
1959	10.0 C	+0.02 C
1960	10.0 C	+0.01 C
1961	10.7 C	+0.71 C
1962	10.0 C	+0.07 C
1965	10.0 C	+0.03 C
1967	10.0 C	+0.08 C

The fitted trend in annual mean temperature here over 1902 to 1967 is 0.06 C (-0.04 to 0.15) 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 60 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Nanaimo
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.06 C (-0.04 to 0.15) per decade	0.1 F (-0.1 to 0.3) per decade	1902 to 1967	60	Not clearly different from zero
Mean daily maximum	0.2 C (0.1 to 0.3) per decade	0.3 F (0.1 to 0.5) per decade	1902 to 1967	60	Rise
Mean daily minimum	-0.1 C (-0.2 to 0.1) per decade	-0.1 F (-0.3 to 0.1) per decade	1902 to 1967	60	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

1892 to 1968

Yearly extremes at Nanaimo: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.6 C (105.1 F)	1941	31.7 C (89.1 F)	70
Coldest night (TNn)	-18.3 C (-0.9 F)	1893	-9.4 C (15.1 F)	70
Wettest day (Rx1day)	76.2 mm (3.0 in)	1923	43.6 mm (1.7 in)	70
Wettest five days (Rx5day)	185.3 mm (7.3 in)	1935	91.2 mm (3.6 in)	70
Longest dry spell (CDD)	58 days	1926	29 days	70

Hottest day (TXx)

The hottest day of the year at Nanaimo, 1892 to 1968. The record is 40.6 C (105.1 F) in 1941, marked on the chart; the median year is 31.7 C (89.1 F).

Hottest day (TXx) at Nanaimo by year
Year	Hottest day (TXx)
1892	32.8 C (91.0 F)
1893	30.0 C (86.0 F)
1901	31.7 C (89.1 F)
1902	32.2 C (90.0 F)
1903	30.6 C (87.1 F)
1904	31.1 C (88.0 F)
1905	30.6 C (87.1 F)
1906	33.3 C (91.9 F)
1907	32.8 C (91.0 F)
1908	34.4 C (93.9 F)
1909	27.8 C (82.0 F)
1910	31.1 C (88.0 F)
1911	33.9 C (93.0 F)
1912	30.0 C (86.0 F)
1913	31.7 C (89.1 F)
1914	29.4 C (84.9 F)
1915	33.9 C (93.0 F)
1916	31.7 C (89.1 F)
1917	30.0 C (86.0 F)
1918	32.8 C (91.0 F)
1919	28.3 C (82.9 F)
1920	32.8 C (91.0 F)
1921	31.1 C (88.0 F)
1922	31.7 C (89.1 F)
1923	30.6 C (87.1 F)
1924	30.6 C (87.1 F)
1925	33.3 C (91.9 F)
1926	32.2 C (90.0 F)
1927	33.3 C (91.9 F)
1928	31.7 C (89.1 F)
1929	28.9 C (84.0 F)
1930	30.0 C (86.0 F)
1931	32.2 C (90.0 F)
1932	30.6 C (87.1 F)
1933	32.2 C (90.0 F)
1934	31.1 C (88.0 F)
1935	32.8 C (91.0 F)
1936	28.9 C (84.0 F)
1937	29.4 C (84.9 F)
1938	33.9 C (93.0 F)
1939	33.9 C (93.0 F)
1940	32.2 C (90.0 F)
1941	40.6 C (105.1 F)
1942	33.9 C (93.0 F)
1943	30.6 C (87.1 F)
1944	32.2 C (90.0 F)
1945	32.2 C (90.0 F)
1946	31.7 C (89.1 F)
1947	31.7 C (89.1 F)
1948	31.7 C (89.1 F)
1949	29.4 C (84.9 F)
1950	31.1 C (88.0 F)
1951	32.2 C (90.0 F)
1952	34.4 C (93.9 F)
1953	30.0 C (86.0 F)
1954	27.2 C (81.0 F)
1955	30.0 C (86.0 F)
1956	32.8 C (91.0 F)
1957	28.3 C (82.9 F)
1958	33.3 C (91.9 F)
1959	32.8 C (91.0 F)
1960	32.2 C (90.0 F)
1961	35.0 C (95.0 F)
1962	30.0 C (86.0 F)
1963	31.7 C (89.1 F)
1964	27.8 C (82.0 F)
1965	35.6 C (96.1 F)
1966	32.2 C (90.0 F)
1967	33.3 C (91.9 F)
1968	25.6 C (78.1 F)

Coldest night (TNn)

The coldest night of the year at Nanaimo, 1892 to 1968. The record is -18.3 C (-0.9 F) in 1893, marked on the chart; the median year is -9.4 C (15.1 F).

Coldest night (TNn) at Nanaimo by year
Year	Coldest night (TNn)
1892	-8.3 C (17.1 F)
1893	-18.3 C (-0.9 F)
1901	-4.4 C (24.1 F)
1902	-13.9 C (7.0 F)
1903	-7.8 C (18.0 F)
1904	-6.1 C (21.0 F)
1905	-10.6 C (12.9 F)
1906	-8.3 C (17.1 F)
1907	-17.2 C (1.0 F)
1908	-11.7 C (10.9 F)
1909	-14.4 C (6.1 F)
1910	-9.4 C (15.1 F)
1911	-10.6 C (12.9 F)
1912	-7.2 C (19.0 F)
1913	-11.7 C (10.9 F)
1914	-5.0 C (23.0 F)
1915	-5.0 C (23.0 F)
1916	-11.1 C (12.0 F)
1917	-9.4 C (15.1 F)
1918	-7.8 C (18.0 F)
1919	-11.7 C (10.9 F)
1920	-7.2 C (19.0 F)
1921	-10.6 C (12.9 F)
1922	-10.6 C (12.9 F)
1923	-11.1 C (12.0 F)
1924	-10.0 C (14.0 F)
1925	-3.3 C (26.1 F)
1926	-7.8 C (18.0 F)
1927	-11.1 C (12.0 F)
1928	-5.0 C (23.0 F)
1929	-11.1 C (12.0 F)
1930	-11.1 C (12.0 F)
1931	-3.3 C (26.1 F)
1932	-9.4 C (15.1 F)
1933	-9.4 C (15.1 F)
1934	-2.2 C (28.0 F)
1935	-14.4 C (6.1 F)
1936	-11.7 C (10.9 F)
1937	-11.1 C (12.0 F)
1938	-4.4 C (24.1 F)
1939	-6.7 C (19.9 F)
1940	-4.4 C (24.1 F)
1941	-9.4 C (15.1 F)
1942	-10.6 C (12.9 F)
1943	-14.4 C (6.1 F)
1944	-7.2 C (19.0 F)
1945	-6.7 C (19.9 F)
1946	-5.6 C (21.9 F)
1947	-10.6 C (12.9 F)
1948	-9.4 C (15.1 F)
1949	-10.6 C (12.9 F)
1950	-16.1 C (3.0 F)
1951	-10.6 C (12.9 F)
1952	-5.0 C (23.0 F)
1953	-2.2 C (28.0 F)
1954	-10.0 C (14.0 F)
1955	-11.7 C (10.9 F)
1956	-10.6 C (12.9 F)
1957	-16.1 C (3.0 F)
1958	-5.6 C (21.9 F)
1959	-9.4 C (15.1 F)
1960	-7.2 C (19.0 F)
1961	-5.0 C (23.0 F)
1962	-9.4 C (15.1 F)
1963	-10.0 C (14.0 F)
1964	-12.2 C (10.0 F)
1965	-6.7 C (19.9 F)
1966	-7.8 C (18.0 F)
1967	-6.7 C (19.9 F)
1968	-7.8 C (18.0 F)

Wettest day (Rx1day)

The wettest day of the year at Nanaimo, 1892 to 1968. The record is 76.2 mm (3.0 in) in 1923, marked on the chart; the median year is 43.6 mm (1.7 in).

Wettest day (Rx1day) at Nanaimo by year
Year	Wettest day (Rx1day)
1892	53.1 mm (2.1 in)
1893	34.5 mm (1.4 in)
1901	31.8 mm (1.3 in)
1902	53.3 mm (2.1 in)
1903	37.3 mm (1.5 in)
1904	47.2 mm (1.9 in)
1905	47.0 mm (1.9 in)
1906	37.6 mm (1.5 in)
1907	47.5 mm (1.9 in)
1908	48.5 mm (1.9 in)
1909	69.9 mm (2.8 in)
1910	38.6 mm (1.5 in)
1911	54.6 mm (2.1 in)
1912	43.2 mm (1.7 in)
1913	34.3 mm (1.4 in)
1914	46.7 mm (1.8 in)
1915	34.3 mm (1.4 in)
1916	30.0 mm (1.2 in)
1917	33.0 mm (1.3 in)
1918	65.0 mm (2.6 in)
1919	35.8 mm (1.4 in)
1920	51.3 mm (2.0 in)
1921	69.6 mm (2.7 in)
1922	29.7 mm (1.2 in)
1923	76.2 mm (3.0 in)
1924	43.9 mm (1.7 in)
1925	31.8 mm (1.3 in)
1926	46.7 mm (1.8 in)
1927	29.0 mm (1.1 in)
1928	27.7 mm (1.1 in)
1929	33.5 mm (1.3 in)
1930	44.2 mm (1.7 in)
1931	48.0 mm (1.9 in)
1932	37.3 mm (1.5 in)
1933	36.6 mm (1.4 in)
1934	43.2 mm (1.7 in)
1935	71.6 mm (2.8 in)
1936	38.4 mm (1.5 in)
1937	40.9 mm (1.6 in)
1938	55.9 mm (2.2 in)
1939	47.5 mm (1.9 in)
1940	45.0 mm (1.8 in)
1941	36.3 mm (1.4 in)
1942	25.4 mm (1.0 in)
1943	33.8 mm (1.3 in)
1944	61.2 mm (2.4 in)
1945	37.1 mm (1.5 in)
1946	30.0 mm (1.2 in)
1947	55.1 mm (2.2 in)
1948	54.9 mm (2.2 in)
1949	58.9 mm (2.3 in)
1950	54.4 mm (2.1 in)
1951	48.5 mm (1.9 in)
1952	41.4 mm (1.6 in)
1953	41.1 mm (1.6 in)
1954	52.3 mm (2.1 in)
1955	68.6 mm (2.7 in)
1956	47.5 mm (1.9 in)
1957	44.2 mm (1.7 in)
1958	58.4 mm (2.3 in)
1959	43.4 mm (1.7 in)
1960	66.0 mm (2.6 in)
1961	38.9 mm (1.5 in)
1962	43.7 mm (1.7 in)
1963	31.8 mm (1.3 in)
1964	20.8 mm (0.8 in)
1965	40.6 mm (1.6 in)
1966	36.8 mm (1.4 in)
1967	33.5 mm (1.3 in)
1968	47.8 mm (1.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Nanaimo, 1892 to 1968. The record is 185.3 mm (7.3 in) in 1935, marked on the chart; the median year is 91.2 mm (3.6 in).

Wettest five days (Rx5day) at Nanaimo by year
Year	Wettest five days (Rx5day)
1892	68.3 mm (2.7 in)
1893	71.1 mm (2.8 in)
1901	74.2 mm (2.9 in)
1902	85.0 mm (3.3 in)
1903	86.8 mm (3.4 in)
1904	83.0 mm (3.3 in)
1905	86.3 mm (3.4 in)
1906	105.9 mm (4.2 in)
1907	90.2 mm (3.6 in)
1908	115.3 mm (4.5 in)
1909	122.3 mm (4.8 in)
1910	94.4 mm (3.7 in)
1911	92.2 mm (3.6 in)
1912	62.3 mm (2.5 in)
1913	78.1 mm (3.1 in)
1914	112.5 mm (4.4 in)
1915	79.2 mm (3.1 in)
1916	75.1 mm (3.0 in)
1917	83.8 mm (3.3 in)
1918	90.4 mm (3.6 in)
1919	91.0 mm (3.6 in)
1920	76.1 mm (3.0 in)
1921	130.9 mm (5.2 in)
1922	85.8 mm (3.4 in)
1923	98.3 mm (3.9 in)
1924	63.5 mm (2.5 in)
1925	69.8 mm (2.7 in)
1926	79.7 mm (3.1 in)
1927	97.3 mm (3.8 in)
1928	69.6 mm (2.7 in)
1929	95.0 mm (3.7 in)
1930	71.3 mm (2.8 in)
1931	88.7 mm (3.5 in)
1932	79.1 mm (3.1 in)
1933	93.7 mm (3.7 in)
1934	86.7 mm (3.4 in)
1935	185.3 mm (7.3 in)
1936	69.8 mm (2.7 in)
1937	124.5 mm (4.9 in)
1938	120.9 mm (4.8 in)
1939	151.9 mm (6.0 in)
1940	72.2 mm (2.8 in)
1941	88.4 mm (3.5 in)
1942	67.1 mm (2.6 in)
1943	57.9 mm (2.3 in)
1944	95.2 mm (3.7 in)
1945	97.9 mm (3.9 in)
1946	84.9 mm (3.3 in)
1947	105.4 mm (4.1 in)
1948	111.3 mm (4.4 in)
1949	120.6 mm (4.7 in)
1950	92.2 mm (3.6 in)
1951	114.5 mm (4.5 in)
1952	83.1 mm (3.3 in)
1953	102.3 mm (4.0 in)
1954	154.3 mm (6.1 in)
1955	124.5 mm (4.9 in)
1956	119.0 mm (4.7 in)
1957	108.2 mm (4.3 in)
1958	112.0 mm (4.4 in)
1959	93.5 mm (3.7 in)
1960	111.2 mm (4.4 in)
1961	98.3 mm (3.9 in)
1962	84.0 mm (3.3 in)
1963	107.0 mm (4.2 in)
1964	34.0 mm (1.3 in)
1965	92.8 mm (3.7 in)
1966	91.4 mm (3.6 in)
1967	82.1 mm (3.2 in)
1968	118.6 mm (4.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Nanaimo, 1892 to 1968. The record is 58 days in 1926, marked on the chart; the median year is 29 days.

Longest dry spell (CDD) at Nanaimo by year
Year	Longest dry spell (CDD)
1892	21 days
1893	18 days
1901	40 days
1902	20 days
1903	23 days
1904	30 days
1905	16 days
1906	32 days
1907	29 days
1908	42 days
1909	22 days
1910	42 days
1911	28 days
1912	21 days
1913	32 days
1914	29 days
1915	26 days
1916	46 days
1917	44 days
1918	38 days
1919	32 days
1920	29 days
1921	21 days
1922	44 days
1923	43 days
1924	34 days
1925	39 days
1926	58 days
1927	30 days
1928	39 days
1929	29 days
1930	40 days
1931	43 days
1932	28 days
1933	24 days
1934	31 days
1935	26 days
1936	36 days
1937	29 days
1938	34 days
1939	38 days
1940	32 days
1941	22 days
1942	39 days
1943	24 days
1944	30 days
1945	26 days
1946	25 days
1947	17 days
1948	16 days
1949	18 days
1950	29 days
1951	27 days
1952	41 days
1953	18 days
1954	28 days
1955	23 days
1956	27 days
1957	20 days
1958	34 days
1959	35 days
1960	31 days
1961	38 days
1962	27 days
1963	11 days
1964	12 days
1965	27 days
1966	17 days
1967	42 days
1968	17 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

60 years with a frost

Across 60 years with a frost, the median last spring frost at Nanaimo falls on 15 April and the median first autumn frost on 3 November, which leaves a median of 202 days between them.

In 1935 to 1967 the median growing season was 194 days. That is 19 days fewer than in 1902 to 1934.

Fitted over all years, the growing season changes by -2.4 days per decade at this station.

Frost dates and growing season at Nanaimo
Measure	Median, all years	Earliest period (1902 to 1934)	Recent period (1935 to 1967)	Recent against earliest	Fitted trend
Last spring frost	15 April	11 April	17 April	6 days later	+0.5 days per decade
First autumn frost	3 November	10 November	25 October	16 days earlier	-1.9 days per decade
Growing days	202 days	213 days	194 days	19 days fewer	-2.4 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

62 years, 1892 to 1965

A day with at least 44.4 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 81.4 mm (3.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Nanaimo: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	44.4 mm (1.7 in)
5 years	55.4 mm (2.2 in)
10 years	62.2 mm (2.4 in)
25 years	70.3 mm (2.8 in)
50 years	76.0 mm (3.0 in)
100 years	81.4 mm (3.2 in)	Longer than the 62 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, 62 years of values from 1892 to 1965.

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: 76.2 mm (3.0 in) in 1923; 71.6 mm (2.8 in) in 1935; 69.9 mm (2.8 in) in 1909.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Nanaimo, at 1938. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1938 ran 0.3 C (0.6 F) lower than in the years before (likely change).

Suspected changes in the annual mean temperature at Nanaimo, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1938	-0.3	-0.6	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 Nanaimo standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Nanaimo 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).