Canadian Climate Normals 1981-2010 Station Data

Temperature and Precipitation Graph
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Normals 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.

NANAIMO A *
BRITISH COLUMBIA

* This station meets WMO standards for temperature and precipitation.

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Normals Station Data
(all elements)
Temperature
1981 to 2010 Canadian Climate Normals station data
Temperature
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Daily Average (°C)3.54.36.39.012.515.618.118.214.99.95.63.110.1A
Standard Deviation1.41.51.10.91.31.21.10.91.00.81.61.61.3A
Daily Maximum (°C)6.98.511.014.117.720.823.924.320.914.69.36.314.8A
Daily Minimum (°C)0.10.01.73.97.210.312.312.18.95.21.8-0.25.3A
Extreme Maximum (°C)15.618.321.726.134.334.536.136.733.229.319.418.2
Date (yyyy/dd)1968/ 201968/ 271994/ 281998/ 301983/ 291987/ 291965/ 301960/ 091988/ 031987/ 011949/ 022005/ 24
Extreme Minimum (°C)-17.8-16.7-12.2-5.0-4.40.62.83.3-1.1-6.7-16.1-20.0
Date (yyyy/dd)1950/ 311950/ 031951/ 101948/ 031949/ 161954/ 171954/ 031973/ 181947/ 171949/ 181955/ 141968/ 30
Precipitation
1981 to 2010 Canadian Climate Normals station data
Precipitation
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Rainfall (mm)167.8115.2106.967.254.243.425.428.435.8101.2186.5166.11098.2A
Snowfall (cm)21.010.96.20.20.10.00.00.00.01.210.718.468.7A
Precipitation (mm)187.9126.0113.067.454.343.425.428.435.8102.2197.2184.31165.4A
Average Snow Depth (cm)2100000000120C
Median Snow Depth (cm)1000000000000C
Snow Depth at Month-end (cm)1000000000351C
Extreme Daily Rainfall (mm)70.697.357.458.730.833.023.675.647.291.784.174.4
Date (yyyy/dd)1968/ 181991/ 011997/ 171962/ 271984/ 252006/ 081949/ 231991/ 291953/ 291963/ 211955/ 021979/ 17
Extreme Daily Snowfall (cm)38.673.733.04.61.00.00.00.00.020.032.947.8
Date (yyyy/dd)1971/ 131975/ 121991/ 011981/ 121996/ 081947/ 011947/ 071947/ 011947/ 011984/ 311984/ 011965/ 27
Extreme Daily Precipitation (mm)70.697.357.458.730.833.023.675.647.291.784.174.4
Date (yyyy/dd)1968/ 181991/ 011997/ 171962/ 271984/ 252006/ 081949/ 231991/ 291953/ 291963/ 211955/ 021979/ 17
Extreme Snow Depth (cm)74663310000004774
Date (yyyy/dd)1966/ 041975/ 121962/ 051981/ 121955/ 011955/ 011955/ 011955/ 011955/ 011955/ 011985/ 271996/ 30
Days with Maximum Temperature
1981 to 2010 Canadian Climate Normals station data
Days with Maximum Temperature
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
<= 0 °C0.780.150.0800000000.461.22.6A
> 0 °C30.228.130.93031303131303129.529.8362.6A
> 10 °C4.78.419.92730.93031313029.112.32.6256.7A
> 20 °C000.082.28.215.225.626.916.720096.9A
> 30 °C00000.191.32.82.10.280006.7A
> 35 °C0000000.080.0400000.12A
Days with Minimum Temperature
1981 to 2010 Canadian Climate Normals station data
Days with Minimum Temperature
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
> 0 °C15.914.620.526.630.8303131302920.214.2293.7A
<= 2 °C21.319.617.88.81.30000.206.216.122.8114.1A
<= 0 °C15.113.610.53.40.19000029.916.871.5A
< -2 °C87.93.10.35000000.424.48.632.7A
< -10 °C0.480.410.0400000000.350.521.8A
< -20 °C0000000000000A
< - 30 °C0000000000000A
Days with Rainfall
1981 to 2010 Canadian Climate Normals station data
Days with Rainfall
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
>= 0.2 mm1814.917.815.614.812.47.66.88.215.419.818.8170A
>= 5 mm9.26.36.34.43.831.81.82.16.210.59.564.9A
>= 10 mm5.74.13.41.71.40.920.560.5813.46.3635.1A
>= 25 mm1.80.810.580.150.040.0800.120.120.771.91.68A
Days With Snowfall
1981 to 2010 Canadian Climate Normals station data
Days With Snowfall
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
>= 0.2 cm3.12.310.040.0800000.081.23.211A
>= 5 cm1.40.780.420000000.080.501.14.3A
>= 10 cm0.700.330.190000000.080.380.762.4A
>= 25 cm0.110.040.0400000000.120.120.43A
Days with Precipitation
1981 to 2010 Canadian Climate Normals station data
Days with Precipitation
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
>= 0.2 mm19.71618.215.614.812.47.66.88.215.520.520.4175.6A
>= 5 mm10.676.74.43.831.81.82.16.31110.468.8A
>= 10 mm6.64.63.71.71.40.920.560.5813.56.66.837.9A
>= 25 mm1.90.930.650.150.040.0800.120.120.772.11.88.7A
Days with Snow Depth
1981 to 2010 Canadian Climate Normals station data
Days with Snow Depth
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
>= 1 cm5.91.60.180.040000000.783.111.6D
>= 5 cm4.61.20.1200000000.651.98.5D
>= 10 cm3.30.56000000000.521.35.6D
>= 20 cm10.06000000000.220.591.9D
Wind
1981 to 2010 Canadian Climate Normals station data
Wind
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Speed (km/h)5.34.77.50.00.00.00.00.00.00.00.00.00.0
Most Frequent DirectionSESESCALMCALMCALMCALMCALMCALMCALMCALMCALMCALM
Maximum Hourly Speed (km/h)514648483739464141525248
Date (yyyy/dd)1955/ 151999/ 021963/ 281996/ 231982/ 251978/ 181994/ 091985/ 111993/ 111995/ 031994/ 161956/ 09
Direction of Maximum Hourly SpeedSEWSSNNWNNNWNWWSW
Maximum Gust Speed (km/h)826471565169484255726464
Date (yyyy/dd)1964/ 191964/ 111963/ 111962/ 061963/ 061962/ 251962/ 161964/ 251964/ 251963/ 211961/ 011961/ 21
Direction of Maximum GustSWNWNSSWNWSWWSNWW
Degree Days
1981 to 2010 Canadian Climate Normals station data
Degree Days
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Above 24 °C000000.10.80.600001.5C
Above 18 °C00001.511.43232.6500082.5C
Above 15 °C0000.411.540.69810131.3100283.5C
Above 10 °C0.20.31.719.986.8166.9250254.1148.633.23.20.2965C
Above 5 °C19.922.555.3121.1232.2316.7405409.1297.9153.846.814.22094.4C
Above 0 °C118.1125.3196.9270387.2466.7560564.1447.9307171.3105.23719.6C
Below 0 °C9.34.60.600000004.410.229C
Below 5 °C66.142.9141.1000001.929.974.1229.9C
Below 10 °C201.3161.8115.449.99.60.2000.736.3136.3215.1926.5C
Below 15 °C356.2302.6268.7180.389.323.931.933.4159283.1369.92071.2C
Below 18 °C449.2387.2361.7270172.484.73026.697.1251.1373.1462.92965.9C
Bright Sunshine
1981 to 2010 Canadian Climate Normals station data
Bright Sunshine
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Total Hours56.888.6133.1179.0224.4226.1288.8280.0213.9131.967.050.81940.2D
Days with measurable18.320.625.426.628.828.029.929.728.524.418.816.5295.3D
% of possible daylight hours21.031.036.243.647.446.759.162.856.439.324.319.740.6D
Extreme Daily8.410.111.313.714.615.815.014.412.811.28.78.0
Date (yyyy/dd)1996/ 311995/ 281966/ 261989/ 291985/ 152000/ 162001/ 061996/ 221988/ 011999/ 211995/ 011988/ 16
Humidex
1981 to 2010 Canadian Climate Normals station data
Humidex
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Extreme Humidex16.017.821.326.237.036.440.842.935.729.520.220.1
Date (yyyy/dd)1968/ 201968/ 271994/ 281987/ 271983/ 291969/ 172009/ 291974/ 291988/ 031987/ 011975/ 031980/ 26
Days with Humidex >= 300.00.00.00.00.00.00.00.00.00.00.00.00.0
Days with Humidex >= 350.00.00.00.00.00.00.00.00.00.00.00.00.0
Days with Humidex >= 400.00.00.00.00.00.00.00.00.00.00.00.00.0
Wind Chill
1981 to 2010 Canadian Climate Normals station data
Wind Chill
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Extreme Wind Chill-22-18-14-7-7000-3-7-22-21
Date (yyyy/dd)1969/ 251989/ 011955/ 051954/ 141954/ 011954/ 011954/ 011954/ 011961/ 291956/ 281955/ 141964/ 16
Days with Wind Chill < -200.00.00.00.00.00.00.00.00.00.00.00.00.0
Days with Wind Chill < -300.00.00.00.00.00.00.00.00.00.00.00.00.0
Days with Wind Chill < -400.00.00.00.00.00.00.00.00.00.00.00.00.0
Humidity
1981 to 2010 Canadian Climate Normals station data
Humidity
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Average Vapour Pressure (kPa)0.90.80.70000000000
Average Relative Humidity - 0600LST (%)92.890.289.786.9827978.582.887.190.191.491.886.9A
Average Relative Humidity - 1500LST (%)81.571.165.559.657.85752.752.156.268.578.483.265.3A
Pressure
1981 to 2010 Canadian Climate Normals station data
Pressure
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Average Station Pressure (kPa)100.6101.1101.20000000000
Average Sea Level Pressure (kPa)101101.5101.60000000000
Visibility (hours with)
1981 to 2010 Canadian Climate Normals station data
Visibility (hours with)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
< 1 km0400000000000
1 to 9 km0151190000000000
> 9 km05177250000000000
Cloud Amount (hours with)
1981 to 2010 Canadian Climate Normals station data
Cloud Amount (hours with)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
0 to 2 tenths0131930000000000
3 to 7 tenths0901540000000000
8 to 10 tenths04514970000000000
Frost-Free
1981 to 2010 Canadian Climate Normals station data (Frost-Free)
Frost-Free
Date/Days Code
Average Date of Last Spring Frost Apr 14 C
Average Date of First Fall Frost Oct 26 C
Average Length of Frost-Free Period 194 Days C
1981 to 2010 Canadian Climate Normals station data (Frost-Free)
Frost-Free
Probability of last temperature in spring of 0 °C or lower on or after indicated dates10%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 dates10%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
Station / Element Metadata

Statistics listed below are provided as a guide to determine the validity of Normals and Extremes calculations. For example, a station with 30 years of record between 1981 and 2010 with no missing years would be a more reliable normal than a station with 15 years of record and 2 missing years. Less than 100% possible observations indicates that out of the total number of observations used, some records were missing.

NANAIMO A

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