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
Record highRecord low2026 daily maximum2026 daily minimum
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
Year with most
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
Complete yearUnder 90 percent of days
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.
Cooler than the station meanWarmer than the station mean
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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.