Canadian Climate Normals 1981-2010 Station Data

The minimum number of years used to calculate these Normals is indicated by a code for each element. A "+" beside an extreme date indicates that this date is the first occurrence of the extreme value. Values and dates in bold indicate all-time extremes for the location.

Data used in the calculation of these Normals may be subject to further quality assurance checks. This may result in minor changes to some values presented here.

Metadata including Station Name, Province, Latitude, Longitude, Elevation, Climate ID, WMO ID, TC ID
NANAIMO A *
BRITISH COLUMBIA
Latitude: 49°03'16.000" N Longitude: 123°52'12.000" W Elevation: 28.00 m
Climate ID: 1025370 WMO ID: TC ID: YCD

* This station meets WMO standards for temperature and precipitation.

1981 to 2010 Canadian Climate Normals station data
 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Temperature:
Daily Average (°C)3.5 4.3 6.3 9 12.5 15.6 18.1 18.2 14.9 9.9 5.6 3.1 10.1 Legend AA
Standard Deviation1.4 1.5 1.1 0.9 1.3 1.2 1.1 0.9 1 0.8 1.6 1.6 1.3 Legend AA
Daily Maximum (°C)6.9 8.5 11 14.1 17.7 20.8 23.9 24.3 20.9 14.6 9.3 6.3 14.8 Legend AA
Daily Minimum (°C)0.1 0 1.7 3.9 7.2 10.3 12.3 12.1 8.9 5.2 1.8 -0.2 5.3 Legend AA
Extreme Maximum (°C)15.6 18.3 21.7 26.1 34.3 34.5 36.1 36.7 33.2 29.3 19.4 18.2   Legend
Date
(yyyy/dd)
1968/ 20 1968/ 27 1994/ 28 1998/ 30 1983/ 29 1987/ 29 1965/ 30 1960/ 09 1988/ 03 1987/ 01 1949/ 02 2005/ 24  
Extreme Minimum (°C)-17.8 -16.7 -12.2 -5 -4.4 0.6 2.8 3.3 -1.1 -6.7 -16.1 -20   Legend
Date
(yyyy/dd)
1950/ 31 1950/ 03 1951/ 10 1948/ 03 1949/ 16 1954/ 17 1954/ 03 1973/ 18 1947/ 17 1949/ 18 1955/ 14 1968/ 30  
Precipitation:
Rainfall (mm)167.8 115.2 106.9 67.2 54.2 43.4 25.4 28.4 35.8 101.2 186.5 166.1 1098.2 Legend AA
Snowfall (cm)21 10.9 6.2 0.2 0.1 0 0 0 0 1.2 10.7 18.4 68.7 Legend AA
Precipitation (mm)187.9 126 113 67.4 54.3 43.4 25.4 28.4 35.8 102.2 197.2 184.3 1165.4 Legend AA
Average Snow Depth (cm)2 1 0 0 0 0 0 0 0 0 1 2 0 Legend CC
Median Snow Depth (cm)1 0 0 0 0 0 0 0 0 0 0 0 0 Legend CC
Snow Depth at Month-end (cm)1 0 0 0 0 0 0 0 0 0 3 5 1 Legend CC
Extreme Daily Rainfall (mm)70.6 97.3 57.4 58.7 30.8 33 23.6 75.6 47.2 91.7 84.1 74.4   Legend
Date
(yyyy/dd)
1968/ 18 1991/ 01 1997/ 17 1962/ 27 1984/ 25 2006/ 08 1949/ 23 1991/ 29 1953/ 29 1963/ 21 1955/ 02 1979/ 17  
Extreme Daily Snowfall (cm)38.6 73.7 33 4.6 1 0 0 0 0 20 32.9 47.8   Legend
Date
(yyyy/dd)
1971/ 13 1975/ 12 1991/ 01 1981/ 12 1996/ 08 1947/ 01 1947/ 07 1947/ 01 1947/ 01 1984/ 31 1984/ 01 1965/ 27  
Extreme Daily Precipitation (mm)70.6 97.3 57.4 58.7 30.8 33 23.6 75.6 47.2 91.7 84.1 74.4   Legend
Date
(yyyy/dd)
1968/ 18 1991/ 01 1997/ 17 1962/ 27 1984/ 25 2006/ 08 1949/ 23 1991/ 29 1953/ 29 1963/ 21 1955/ 02 1979/ 17  
Extreme Snow Depth (cm)74 66 33 1 0 0 0 0 0 0 47 74   Legend
Date
(yyyy/dd)
1966/ 04 1975/ 12 1962/ 05 1981/ 12 1955/ 01 1955/ 01 1955/ 01 1955/ 01 1955/ 01 1955/ 01 1985/ 27 1996/ 30  
Days with Maximum Temperature:
<= 0 °C0.78 0.15 0.08 0 0 0 0 0 0 0 0.46 1.2 2.6 Legend AA
> 0 °C30.2 28.1 30.9 30 31 30 31 31 30 31 29.5 29.8 362.6 Legend AA
> 10 °C4.7 8.4 19.9 27 30.9 30 31 31 30 29.1 12.3 2.6 256.7 Legend AA
> 20 °C0 0 0.08 2.2 8.2 15.2 25.6 26.9 16.7 2 0 0 96.9 Legend AA
> 30 °C0 0 0 0 0.19 1.3 2.8 2.1 0.28 0 0 0 6.7 Legend AA
> 35 °C0 0 0 0 0 0 0.08 0.04 0 0 0 0 0.12 Legend AA
Days with Minimum Temperature:
> 0 °C15.9 14.6 20.5 26.6 30.8 30 31 31 30 29 20.2 14.2 293.7 Legend AA
<= 2 °C21.3 19.6 17.8 8.8 1.3 0 0 0 0.20 6.2 16.1 22.8 114.1 Legend AA
<= 0 °C15.1 13.6 10.5 3.4 0.19 0 0 0 0 2 9.9 16.8 71.5 Legend AA
< -2 °C8 7.9 3.1 0.35 0 0 0 0 0 0.42 4.4 8.6 32.7 Legend AA
< -10 °C0.48 0.41 0.04 0 0 0 0 0 0 0 0.35 0.52 1.8 Legend AA
< -20 °C0 0 0 0 0 0 0 0 0 0 0 0 0 Legend AA
< - 30 °C0 0 0 0 0 0 0 0 0 0 0 0 0 Legend AA
Days with Rainfall:
>= 0.2 mm18 14.9 17.8 15.6 14.8 12.4 7.6 6.8 8.2 15.4 19.8 18.8 170 Legend AA
>= 5 mm9.2 6.3 6.3 4.4 3.8 3 1.8 1.8 2.1 6.2 10.5 9.5 64.9 Legend AA
>= 10 mm5.7 4.1 3.4 1.7 1.4 0.92 0.56 0.58 1 3.4 6.3 6 35.1 Legend AA
>= 25 mm1.8 0.81 0.58 0.15 0.04 0.08 0 0.12 0.12 0.77 1.9 1.6 8 Legend AA
Days With Snowfall:
>= 0.2 cm3.1 2.3 1 0.04 0.08 0 0 0 0 0.08 1.2 3.2 11 Legend AA
>= 5 cm1.4 0.78 0.42 0 0 0 0 0 0 0.08 0.50 1.1 4.3 Legend AA
>= 10 cm0.70 0.33 0.19 0 0 0 0 0 0 0.08 0.38 0.76 2.4 Legend AA
>= 25 cm0.11 0.04 0.04 0 0 0 0 0 0 0 0.12 0.12 0.43 Legend AA
Days with Precipitation:
>= 0.2 mm19.7 16 18.2 15.6 14.8 12.4 7.6 6.8 8.2 15.5 20.5 20.4 175.6 Legend AA
>= 5 mm10.6 7 6.7 4.4 3.8 3 1.8 1.8 2.1 6.3 11 10.4 68.8 Legend AA
>= 10 mm6.6 4.6 3.7 1.7 1.4 0.92 0.56 0.58 1 3.5 6.6 6.8 37.9 Legend AA
>= 25 mm1.9 0.93 0.65 0.15 0.04 0.08 0 0.12 0.12 0.77 2.1 1.8 8.7 Legend AA
Days with Snow Depth:
>= 1 cm5.9 1.6 0.18 0.04 0 0 0 0 0 0 0.78 3.1 11.6 Legend DD
>= 5 cm4.6 1.2 0.12 0 0 0 0 0 0 0 0.65 1.9 8.5 Legend DD
>= 10 cm3.3 0.56 0 0 0 0 0 0 0 0 0.52 1.3 5.6 Legend DD
>= 20 cm1 0.06 0 0 0 0 0 0 0 0 0.22 0.59 1.9 Legend DD
Wind:
Speed (km/h)5.3 4.7 7.5 0 0 0 0 0 0 0 0 0 0 Legend
Most Frequent DirectionSE SE S CALM CALM CALM CALM CALM CALM CALM CALM CALM CALM Legend
Maximum Hourly Speed (km/h)51 46 48 48 37 39 46 41 41 52 52 48   Legend
Date
(yyyy/dd)
1955/ 15 1999/ 02 1963/ 28 1996/ 23 1982/ 25 1978/ 18 1994/ 09 1985/ 11 1993/ 11 1995/ 03 1994/ 16 1956/ 09  
Direction of Maximum Hourly SpeedSE W S S N NW N N NW NW W SW W Legend
Maximum Gust Speed (km/h)82 64 71 56 51 69 48 42 55 72 64 64   Legend
Date
(yyyy/dd)
1964/ 19 1964/ 11 1963/ 11 1962/ 06 1963/ 06 1962/ 25 1962/ 16 1964/ 25 1964/ 25 1963/ 21 1961/ 01 1961/ 21  
Direction of Maximum GustS W NW N S SW NW SW W S NW W S Legend
Degree Days:
Above 24 °C0 0 0 0 0 0.1 0.8 0.6 0 0 0 0 1.5 Legend CC
Above 18 °C0 0 0 0 1.5 11.4 32 32.6 5 0 0 0 82.5 Legend CC
Above 15 °C0 0 0 0.4 11.5 40.6 98 101 31.3 1 0 0 283.5 Legend CC
Above 10 °C0.2 0.3 1.7 19.9 86.8 166.9 250 254.1 148.6 33.2 3.2 0.2 965 Legend CC
Above 5 °C19.9 22.5 55.3 121.1 232.2 316.7 405 409.1 297.9 153.8 46.8 14.2 2094.4 Legend CC
Above 0 °C118.1 125.3 196.9 270 387.2 466.7 560 564.1 447.9 307 171.3 105.2 3719.6 Legend CC
Below 0 °C9.3 4.6 0.6 0 0 0 0 0 0 0 4.4 10.2 29 Legend CC
Below 5 °C66.1 42.9 14 1.1 0 0 0 0 0 1.9 29.9 74.1 229.9 Legend CC
Below 10 °C201.3 161.8 115.4 49.9 9.6 0.2 0 0 0.7 36.3 136.3 215.1 926.5 Legend CC
Below 15 °C356.2 302.6 268.7 180.3 89.3 23.9 3 1.9 33.4 159 283.1 369.9 2071.2 Legend CC
Below 18 °C449.2 387.2 361.7 270 172.4 84.7 30 26.6 97.1 251.1 373.1 462.9 2965.9 Legend CC
Bright Sunshine:
Total Hours56.8 88.6 133.1 179 224.4 226.1 288.8 280 213.9 131.9 67 50.8 1940.2 Legend DD
Days with measureable18.3 20.6 25.4 26.6 28.8 28 29.9 29.7 28.5 24.4 18.8 16.5 295.3 Legend DD
% of possible daylight hours21 31 36.2 43.6 47.4 46.7 59.1 62.8 56.4 39.3 24.3 19.7 40.6 Legend DD
Extreme Daily8.4 10.1 11.3 13.7 14.6 15.8 15 14.4 12.8 11.2 8.7 8   Legend
Date
(yyyy/dd)
1996/ 31 1995/ 28 1966/ 26 1989/ 29 1985/ 15 2000/ 16 2001/ 06 1996/ 22 1988/ 01 1999/ 21 1995/ 01 1988/ 16  
Humidex:
Extreme Humidex16 17.8 21.3 26.2 37 36.4 40.8 42.9 35.7 29.5 20.2 20.1   Legend
Date
(yyyy/dd)
1968/ 20 1968/ 27 1994/ 28 1987/ 27 1983/ 29 1969/ 17 2009/ 29 1974/ 29 1988/ 03 1987/ 01 1975/ 03 1980/ 26  
Days with Humidex >= 300 0 0 0 0 0 0 0 0 0 0 0 0 Legend
Days with Humidex >= 350 0 0 0 0 0 0 0 0 0 0 0 0 Legend
Days with Humidex >= 400 0 0 0 0 0 0 0 0 0 0 0 0 Legend
Wind Chill:
Extreme Wind Chill-22.4 -18.4 -14.1 -6.7 -6.7 0 0 0 -2.7 -6.7 -22 -21.2   Legend
Date
(yyyy/dd)
1969/ 25 1989/ 01 1955/ 05 1954/ 14 1954/ 01 1954/ 01 1954/ 01 1954/ 01 1961/ 29 1956/ 28 1955/ 14 1964/ 16  
Days with Wind Chill < -200 0 0 0 0 0 0 0 0 0 0 0 0 Legend
Days with Wind Chill < -300 0 0 0 0 0 0 0 0 0 0 0 0 Legend
Days with Wind Chill < -400 0 0 0 0 0 0 0 0 0 0 0 0 Legend
Humidity:
Average Vapour Pressure (kPa)0.9 0.8 0.7 0 0 0 0 0 0 0 0 0 0 Legend
Average Relative Humidity - 0600LST (%)92.8 90.2 89.7 86.9 82 79 78.5 82.8 87.1 90.1 91.4 91.8 86.9 Legend AA
Average Relative Humidity - 1500LST (%)81.5 71.1 65.5 59.6 57.8 57 52.7 52.1 56.2 68.5 78.4 83.2 65.3 Legend AA
Pressure:
Average Station Pressure (kPa)100.6 101.1 101.2 0 0 0 0 0 0 0 0 0 0 Legend
Average Sea Level Pressure (kPa)101 101.5 101.6 0 0 0 0 0 0 0 0 0 0 Legend
Visibility (hours with):
< 1 km0 4 0 0 0 0 0 0 0 0 0 0 0 Legend
1 to 9 km0 151 19 0 0 0 0 0 0 0 0 0 0 Legend
> 9 km0 517 725 0 0 0 0 0 0 0 0 0 0 Legend
Cloud Amount (hours with):
0 to 2 tenths0 131 93 0 0 0 0 0 0 0 0 0 0 Legend
3 to 7 tenths0 90 154 0 0 0 0 0 0 0 0 0 0 Legend
8 to 10 tenths0 451 497 0 0 0 0 0 0 0 0 0 0 Legend
1981 to 2010 Canadian Climate Normals station data (Frost-Free)
Frost-Free:Code
Average Date of Last Spring Frost April 14 LegendCC
Average Date of First Fall Frost October 26 LegendCC
Average Length of Frost-Free Period 194 Days LegendCC
Probability of last temperature in spring of 0 °C or lower on or after indicated dates 10% 25% 33% 50% 66% 75% 90%
DateMay 16May 07May 04Apr 26Apr 18Apr 14Apr 05
Probability of first temperature in fall of 0 °C or lower on or after indicated dates 10% 25% 33% 50% 66% 75% 90%
DateOct 01Oct 13Oct 15Oct 18Oct 24Oct 28Nov 02
Probability of frost-free period equal to or less than indicated period (Days) 10% 25% 33% 50% 66% 75% 90%
Days148160165173185194216
Legend
  • A = WMO "3 and 5 rule" (i.e. no more than 3 consecutive and no more than 5 total missing for either temperature or precipitation)
  • B = At least 25 years
  • C = At least 20 years
  • D = At least 15 years