Record envelope, standing records and threshold days for Nanaimo A (CA001025370), British Columbia, Canada, with 70 years of record.
Key Facts for Nanaimo A
Nanaimo A (CA001025370) is a weather station in British Columbia, Canada at 49.05 latitude and -123.87 longitude, 28 m (92 ft) above sea level.
The station reports from 1947 to 2016, 70 years of record.
1,464 records set at Nanaimo A still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Nanaimo A tied a daily record low maximum temperature of 1.1 C (34.0 F) on 24 December 1983.
About the Station
Location: British Columbia, Canada, 49.05 latitude, -123.87 longitude.
Elevation: 28 m (92 ft).
Period of record: 1947 to 2016, 70 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 A. 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 A, 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)
-17.8 C (0.0 F)
n/a
n/a
Feb
18.3 C (64.9 F)
-16.7 C (1.9 F)
n/a
n/a
Mar
19.6 C (67.3 F)
-12.2 C (10.0 F)
n/a
n/a
Apr
25.6 C (78.1 F)
-5.0 C (23.0 F)
n/a
n/a
May
34.3 C (93.7 F)
-3.3 C (26.1 F)
n/a
n/a
Jun
34.4 C (93.9 F)
0.6 C (33.1 F)
n/a
n/a
Jul
36.1 C (97.0 F)
2.8 C (37.0 F)
n/a
n/a
Aug
36.7 C (98.1 F)
3.3 C (37.9 F)
n/a
n/a
Sep
32.2 C (90.0 F)
-1.1 C (30.0 F)
n/a
n/a
Oct
25.6 C (78.1 F)
-6.7 C (19.9 F)
n/a
n/a
Nov
19.4 C (66.9 F)
-16.1 C (3.0 F)
n/a
n/a
Dec
17.5 C (63.5 F)
-20.0 C (-4.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Nanaimo A still stand. 1955 holds the most, with 68.
Standing records at Nanaimo A by the year they were set
Year set
Standing records
1947
27
1948
39
1949
64
1950
63
1951
52
1952
50
1953
26
1954
53
1955
68
1956
50
1957
30
1958
64
1959
38
1960
42
1961
42
1962
50
1963
39
1964
34
1965
41
1966
21
1967
30
1968
33
1969
28
1970
22
1971
28
1972
47
1973
44
1974
33
1975
26
1976
33
1977
35
1978
32
1979
23
1980
42
1981
37
1982
32
1983
46
Wettest Day of Each Month
Oct: 91.7 mm (3.6 in)
The wettest day on record for each calendar month at Nanaimo A. The most was 91.7 mm (3.6 in) on 21 October 1963.
Record daily precipitation for each month at Nanaimo A
Month
Record daily precipitation (mm)
Date
Jan
70.6 mm (2.8 in)
18 January 1968
Feb
84.6 mm (3.3 in)
12 February 1975
Mar
46.2 mm (1.8 in)
8 March 1983
Apr
58.7 mm (2.3 in)
27 April 1962
May
30.2 mm (1.2 in)
27 May 1948
Jun
29.9 mm (1.2 in)
25 June 1980
Jul
23.6 mm (0.9 in)
23 July 1949
Aug
50.3 mm (2.0 in)
23 August 1975
Sep
47.2 mm (1.9 in)
29 September 1953
Oct
91.7 mm (3.6 in)
21 October 1963
Nov
84.1 mm (3.3 in)
2 November 1955
Dec
74.4 mm (2.9 in)
17 December 1979
Period of Record Coverage
1947 to 1983
Complete yearUnder 90 percent of days
37 years of record at Nanaimo A, 1947 to 1983. 2 years have data for under 90 percent of days and are left out of rankings: 1947, 1953.
Cooler than the station meanWarmer than the station mean
One stripe for each of 32 complete years at Nanaimo A, 1948 to 1983. Blue stripes are years cooler than the station's own mean of 9.2 C (48.6 F); red stripes are warmer. The coolest year was 1955, at 7.7 C (45.9 F), and the warmest was 1958, at 10.7 C (51.3 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Nanaimo A as warming stripes, 1948 to 1983
Year
Annual mean temperature
Difference from the station mean
1948
8.3 C
-0.87 C
1949
8.3 C
-0.89 C
1951
8.8 C
-0.46 C
1952
9.0 C
-0.20 C
1954
8.4 C
-0.78 C
1955
7.7 C
-1.48 C
1956
8.9 C
-0.33 C
1957
8.9 C
-0.28 C
1958
10.7 C
+1.51 C
1959
9.1 C
-0.13 C
1960
9.1 C
-0.11 C
1961
9.7 C
+0.53 C
1962
9.2 C
-0.06 C
1963
9.5 C
+0.28 C
1964
8.7 C
-0.56 C
1965
9.2 C
-0.01 C
1966
9.3 C
+0.12 C
1967
9.9 C
+0.70 C
1968
9.4 C
+0.14 C
1969
9.3 C
+0.05 C
1970
9.4 C
+0.18 C
1971
9.1 C
-0.08 C
1972
9.0 C
-0.17 C
1973
9.3 C
+0.07 C
1974
9.7 C
+0.52 C
1975
9.2 C
-0.06 C
1976
9.3 C
+0.07 C
1977
9.5 C
+0.24 C
1978
9.6 C
+0.34 C
1980
9.5 C
+0.28 C
1981
9.9 C
+0.70 C
1983
9.9 C
+0.72 C
The annual mean temperature here has risen by 0.3 C (0.1 to 0.5) per decade over 1948 to 1983. In Fahrenheit: 0.6 F (0.3 to 0.9) per decade. The slope is a straight line fitted to 32 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Nanaimo A
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.3 C (0.1 to 0.5) per decade
0.6 F (0.3 to 0.9) per decade
1948 to 1983
32
Rise
Mean daily maximum
0.19 C (-0.04 to 0.41) per decade
0.3 F (-0.1 to 0.7) per decade
1948 to 1983
32
Not clearly different from zero
Mean daily minimum
0.5 C (0.3 to 0.7) per decade
0.8 F (0.5 to 1.2) per decade
1948 to 1983
32
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
1947 to 1983
Yearly extremes at Nanaimo A: 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)
1960
32.7 C (90.9 F)
37
Coldest night (TNn)
-20.0 C (-4.0 F)
1968
-12.8 C (9.0 F)
37
Wettest day (Rx1day)
91.7 mm (3.6 in)
1963
51.1 mm (2.0 in)
37
Wettest five days (Rx5day)
178.6 mm (7.0 in)
1979
105.4 mm (4.1 in)
37
Longest dry spell (CDD)
47 days
1974
25 days
37
Hottest day (TXx)
The hottest day of the year at Nanaimo A, 1947 to 1983. The record is 36.7 C (98.1 F) in 1960, marked on the chart; the median year is 32.7 C (90.9 F).
Hottest day (TXx) at Nanaimo A by year
Year
Hottest day (TXx)
1947
30.6 C (87.1 F)
1948
30.6 C (87.1 F)
1949
30.6 C (87.1 F)
1950
31.1 C (88.0 F)
1951
34.4 C (93.9 F)
1952
34.4 C (93.9 F)
1953
31.7 C (89.1 F)
1954
27.2 C (81.0 F)
1955
31.7 C (89.1 F)
1956
33.9 C (93.0 F)
1957
29.4 C (84.9 F)
1958
35.0 C (95.0 F)
1959
34.4 C (93.9 F)
1960
36.7 C (98.1 F)
1961
35.6 C (96.1 F)
1962
31.1 C (88.0 F)
1963
31.7 C (89.1 F)
1964
29.4 C (84.9 F)
1965
36.1 C (97.0 F)
1966
33.9 C (93.0 F)
1967
33.9 C (93.0 F)
1968
32.2 C (90.0 F)
1969
34.4 C (93.9 F)
1970
32.2 C (90.0 F)
1971
35.0 C (95.0 F)
1972
34.4 C (93.9 F)
1973
32.2 C (90.0 F)
1974
33.9 C (93.0 F)
1975
32.2 C (90.0 F)
1976
28.3 C (82.9 F)
1977
34.5 C (94.1 F)
1978
35.4 C (95.7 F)
1979
32.7 C (90.9 F)
1980
31.0 C (87.8 F)
1981
35.9 C (96.6 F)
1982
32.6 C (90.7 F)
1983
34.3 C (93.7 F)
Coldest night (TNn)
The coldest night of the year at Nanaimo A, 1947 to 1983. The record is -20.0 C (-4.0 F) in 1968, marked on the chart; the median year is -12.8 C (9.0 F).
Coldest night (TNn) at Nanaimo A by year
Year
Coldest night (TNn)
1947
-4.4 C (24.1 F)
1948
-13.9 C (7.0 F)
1949
-13.9 C (7.0 F)
1950
-17.8 C (0.0 F)
1951
-14.4 C (6.1 F)
1952
-8.9 C (16.0 F)
1953
-5.0 C (23.0 F)
1954
-14.4 C (6.1 F)
1955
-16.1 C (3.0 F)
1956
-10.0 C (14.0 F)
1957
-16.7 C (1.9 F)
1958
-6.7 C (19.9 F)
1959
-13.9 C (7.0 F)
1960
-9.4 C (15.1 F)
1961
-8.3 C (17.1 F)
1962
-12.8 C (9.0 F)
1963
-12.8 C (9.0 F)
1964
-15.6 C (3.9 F)
1965
-8.3 C (17.1 F)
1966
-7.2 C (19.0 F)
1967
-5.0 C (23.0 F)
1968
-20.0 C (-4.0 F)
1969
-16.7 C (1.9 F)
1970
-11.1 C (12.0 F)
1971
-10.0 C (14.0 F)
1972
-16.1 C (3.0 F)
1973
-13.9 C (7.0 F)
1974
-11.1 C (12.0 F)
1975
-8.3 C (17.1 F)
1976
-7.2 C (19.0 F)
1977
-9.9 C (14.2 F)
1978
-15.9 C (3.4 F)
1979
-13.0 C (8.6 F)
1980
-13.3 C (8.1 F)
1981
-8.6 C (16.5 F)
1982
-10.1 C (13.8 F)
1983
-14.7 C (5.5 F)
Wettest day (Rx1day)
The wettest day of the year at Nanaimo A, 1947 to 1983. The record is 91.7 mm (3.6 in) in 1963, marked on the chart; the median year is 51.1 mm (2.0 in).
Wettest day (Rx1day) at Nanaimo A by year
Year
Wettest day (Rx1day)
1947
55.9 mm (2.2 in)
1948
55.1 mm (2.2 in)
1949
50.8 mm (2.0 in)
1950
50.0 mm (2.0 in)
1951
42.4 mm (1.7 in)
1952
43.7 mm (1.7 in)
1953
47.2 mm (1.9 in)
1954
60.5 mm (2.4 in)
1955
84.1 mm (3.3 in)
1956
68.3 mm (2.7 in)
1957
53.8 mm (2.1 in)
1958
49.5 mm (1.9 in)
1959
34.3 mm (1.4 in)
1960
66.0 mm (2.6 in)
1961
46.2 mm (1.8 in)
1962
58.7 mm (2.3 in)
1963
91.7 mm (3.6 in)
1964
42.9 mm (1.7 in)
1965
57.2 mm (2.3 in)
1966
45.7 mm (1.8 in)
1967
61.5 mm (2.4 in)
1968
70.6 mm (2.8 in)
1969
68.6 mm (2.7 in)
1970
66.0 mm (2.6 in)
1971
44.5 mm (1.8 in)
1972
52.3 mm (2.1 in)
1973
47.5 mm (1.9 in)
1974
51.1 mm (2.0 in)
1975
84.6 mm (3.3 in)
1976
28.4 mm (1.1 in)
1977
49.0 mm (1.9 in)
1978
40.2 mm (1.6 in)
1979
74.4 mm (2.9 in)
1980
49.8 mm (2.0 in)
1981
43.1 mm (1.7 in)
1982
38.4 mm (1.5 in)
1983
75.6 mm (3.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Nanaimo A, 1947 to 1983. The record is 178.6 mm (7.0 in) in 1979, marked on the chart; the median year is 105.4 mm (4.1 in).
Wettest five days (Rx5day) at Nanaimo A by year
Year
Wettest five days (Rx5day)
1947
75.9 mm (3.0 in)
1948
102.5 mm (4.0 in)
1949
107.5 mm (4.2 in)
1950
73.4 mm (2.9 in)
1951
105.2 mm (4.1 in)
1952
91.2 mm (3.6 in)
1953
105.6 mm (4.2 in)
1954
132.9 mm (5.2 in)
1955
150.4 mm (5.9 in)
1956
116.8 mm (4.6 in)
1957
118.7 mm (4.7 in)
1958
90.5 mm (3.6 in)
1959
75.7 mm (3.0 in)
1960
113.0 mm (4.4 in)
1961
102.3 mm (4.0 in)
1962
100.9 mm (4.0 in)
1963
147.6 mm (5.8 in)
1964
103.5 mm (4.1 in)
1965
129.4 mm (5.1 in)
1966
112.0 mm (4.4 in)
1967
125.6 mm (4.9 in)
1968
129.1 mm (5.1 in)
1969
136.4 mm (5.4 in)
1970
103.1 mm (4.1 in)
1971
97.5 mm (3.8 in)
1972
115.2 mm (4.5 in)
1973
129.8 mm (5.1 in)
1974
132.1 mm (5.2 in)
1975
104.6 mm (4.1 in)
1976
81.4 mm (3.2 in)
1977
85.2 mm (3.4 in)
1978
84.6 mm (3.3 in)
1979
178.6 mm (7.0 in)
1980
105.4 mm (4.1 in)
1981
102.9 mm (4.1 in)
1982
99.8 mm (3.9 in)
1983
152.9 mm (6.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Nanaimo A, 1947 to 1983. The record is 47 days in 1974, marked on the chart; the median year is 25 days.
Longest dry spell (CDD) at Nanaimo A by year
Year
Longest dry spell (CDD)
1947
26 days
1948
16 days
1949
22 days
1950
29 days
1951
37 days
1952
41 days
1953
17 days
1954
38 days
1955
24 days
1956
25 days
1957
19 days
1958
35 days
1959
36 days
1960
31 days
1961
38 days
1962
21 days
1963
25 days
1964
23 days
1965
24 days
1966
18 days
1967
42 days
1968
22 days
1969
32 days
1970
25 days
1971
20 days
1972
33 days
1973
21 days
1974
47 days
1975
33 days
1976
15 days
1977
35 days
1978
24 days
1979
32 days
1980
28 days
1981
25 days
1982
20 days
1983
32 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
32 years with a frost
Across 32 years with a frost, the median last spring frost at Nanaimo A falls on 3 May and the median first autumn frost on 16 October, which leaves a median of 167 days between them.
Fitted over all years, the growing season changes by +10.8 days per decade at this station.
Frost dates and growing season at Nanaimo A
Measure
Median, all years
Earliest period
Recent period (1951 to 1983)
Recent against earliest
Fitted trend
Last spring frost
3 May
n/a
3 May
n/a
-4.3 days per decade
First autumn frost
16 October
n/a
16 October
n/a
+6.5 days per decade
Growing days
167 days
n/a
168 days
n/a
+10.8 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
36 years, 1948 to 1983
A day with at least 52.8 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 103.5 mm (4.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Nanaimo A: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
52.8 mm (2.1 in)
5 years
66.3 mm (2.6 in)
10 years
75.3 mm (3.0 in)
25 years
86.6 mm (3.4 in)
50 years
95.1 mm (3.7 in)
Longer than the 36 years of record
100 years
103.5 mm (4.1 in)
Longer than the 36 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, 36 years of values from 1948 to 1983.
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: 91.7 mm (3.6 in) in 1963; 84.6 mm (3.3 in) in 1975; 84.1 mm (3.3 in) in 1955.
Download the Data
Data for Nanaimo A standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Nanaimo A 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.