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- Updated Glossary, including Speed of Maximum Gust, and Total Hourly Precipitation

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- Addition of station inventory lists for 1981-2010, 1971-2000, and 1961-1990 Normals.

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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.

TRENTON A *
ONTARIO
Current Station Operator: DND

* 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)-6.8-5.7-0.76.612.718.020.719.715.38.63.0-3.37.3A
Standard Deviation3.22.42.11.61.61.31.21.21.31.31.42.80.8A
Daily Maximum (°C)-2.0-0.74.211.918.423.626.325.320.913.87.41.012.5A
Daily Minimum (°C)-11.6-10.6-5.71.27.012.315.214.09.73.5-1.4-7.62.2A
Extreme Maximum (°C)15.113.525.429.633.435.638.936.135.027.022.816.2
Date (yyyy/dd)2008/ 081981/ 221998/ 311990/ 282010/ 261964/ 301936/ 091948/ 261953/ 022002/ 011961/ 031982/ 03
Extreme Minimum (°C)-35.1-32.2-28.9-14.4-6.11.15.63.3-4.6-8.3-19.4-31.8
Date (yyyy/dd)1994/ 161943/ 151938/ 041972/ 071966/ 071945/ 011936/ 021935/ 311978/ 261936/ 271949/ 271993/ 27
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)34.229.241.172.279.478.369.072.290.183.386.950.4786.3A
Snowfall (cm)44.834.623.85.60.00.00.00.00.00.310.436.5156.0A
Precipitation (mm)68.156.562.377.379.478.369.072.290.183.695.579.0911.4A
Average Snow Depth (cm)8940000000042A
Median Snow Depth (cm)7830000000032A
Snow Depth at Month-end (cm)10700000000062A
Extreme Daily Rainfall (mm)45.038.658.251.271.180.878.872.0107.264.559.397.0
Date (yyyy/dd)1978/ 261983/ 021980/ 211984/ 051943/ 111984/ 182002/ 261977/ 162004/ 091955/ 141985/ 041941/ 24
Extreme Daily Snowfall (cm)31.036.435.618.35.00.00.00.00.05.132.334.4
Date (yyyy/dd)1981/ 091984/ 281947/ 021975/ 031977/ 081935/ 011935/ 011935/ 011935/ 011969/ 221956/ 252009/ 09
Extreme Daily Precipitation (mm)54.238.658.251.271.180.878.872.0107.264.559.397.0
Date (yyyy/dd)1978/ 261983/ 021980/ 211984/ 051943/ 111984/ 182002/ 261977/ 162004/ 091955/ 141985/ 041941/ 24
Extreme Snow Depth (cm)574641203000053459
Date (yyyy/dd)1978/ 221971/ 181971/ 211975/ 051963/ 011955/ 011955/ 011955/ 011955/ 011969/ 221956/ 271977/ 22
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 °C17.514.66.80.430.00.00.00.00.00.01.512.152.9A
> 0 °C13.613.624.229.631.030.031.031.030.031.028.518.9312.3A
> 10 °C0.550.335.018.530.230.031.031.029.824.68.91.3211.2A
> 20 °C0.00.00.202.511.124.030.329.817.72.90.00.0118.3A
> 30 °C0.00.00.00.00.231.64.02.00.230.00.00.08.0A
> 35 °C0.00.00.00.00.00.00.030.030.00.00.00.00.06A
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 °C1.91.75.018.230.030.031.031.029.623.611.63.6217.2A
<= 2 °C30.427.928.917.63.50.070.00.01.312.723.429.7175.6A
<= 0 °C29.126.626.011.80.970.00.00.00.437.418.427.4148.0A
< -2 °C26.824.321.36.70.130.00.00.00.073.313.423.7119.8A
< -10 °C17.415.17.00.230.00.00.00.00.00.00.9710.751.3A
< -20 °C5.32.40.700.00.00.00.00.00.00.00.01.59.9A
< - 30 °C0.380.00.00.00.00.00.00.00.00.00.00.070.45A
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 mm5.75.38.011.312.311.810.111.211.313.212.37.9120.4A
>= 5 mm2.21.72.64.55.14.63.74.14.75.35.13.246.8A
>= 10 mm1.10.831.32.52.62.62.22.33.02.52.81.625.4A
>= 25 mm0.240.230.200.400.600.590.530.600.970.400.670.285.7A
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 cm12.610.07.02.10.030.00.00.00.00.233.710.546.2A
>= 5 cm2.92.41.60.330.00.00.00.00.00.00.702.210.2A
>= 10 cm1.20.770.600.100.00.00.00.00.00.00.171.13.9A
>= 25 cm0.070.070.030.00.00.00.00.00.00.00.00.070.24A
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 mm15.912.912.612.312.311.810.111.211.313.314.515.2153.4A
>= 5 mm4.53.94.24.85.14.63.74.14.75.35.75.155.6A
>= 10 mm1.81.51.82.72.62.62.22.33.02.53.12.528.6A
>= 25 mm0.340.300.230.400.600.590.530.600.970.400.700.386.0A
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 cm22.621.614.11.30.00.00.00.00.00.03.016.078.5A
>= 5 cm17.016.29.10.570.00.00.00.00.00.00.9710.154.0A
>= 10 cm11.111.35.50.300.00.00.00.00.00.00.435.233.8A
>= 20 cm2.94.01.80.00.00.00.00.00.00.00.01.610.3A
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)15.214.314.415.013.011.711.410.311.112.513.914.613.1A
Most Frequent DirectionWWWSWSWSWSWSWSWSWWWSWA
Maximum Hourly Speed (km/h)8974105766472646364748069
Date (yyyy/dd)1978/ 261968/ 171964/ 051977/ 051962/ 061957/ 291969/ 051967/ 041958/ 301993/ 041992/ 131960/ 09
Direction of Maximum Hourly SpeedSWSWSWSWWSWSWSWSWSSWSW
Maximum Gust Speed (km/h)153113145128106119127103116106145154
Date (yyyy/dd)1959/ 051956/ 251964/ 051979/ 061964/ 091965/ 281967/ 241958/ 311958/ 301967/ 181956/ 211958/ 22
Direction of Maximum GustNWWSWSWSWSWSWSWSWNWSWSW
Days with Winds >= 52 km/h1.91.41.11.50.70.20.20.50.70.91.71.912.7A
Days with Winds >= 63 km/h0.40.30.30.50.00.10.00.10.10.20.30.22.6A
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 °C00000.11.46.63.50.400012.1A
Above 18 °C0000.36.34291.770.617.40.500228.9A
Above 15 °C0002.323.1100.5178.3149.152.33.600509.2A
Above 10 °C00117.6100.6239.8333302.3164.333.12.80.11194.5A
Above 5 °C1.20.611.278.6239.4389.6488457.3309.6123.328.23.82130.8A
Above 0 °C13.913.158.7201.1394.2539.6643612.3459.4267.8109.728.93341.8A
Below 0 °C225.6173.181.64.4000000.120.3130.7635.8A
Below 5 °C367.9301.7189.131.90.20000.210.688.9260.71,251A
Below 10 °C521.7442.3333.8120.816.30.1004.975.4213.44122140.8A
Below 15 °C676.7583.5487.9255.693.910.90.21.842.9200.9360.6566.93281.7A
Below 18 °C769.7668.2580.8343.6170.142.46.616.398290.9450.6659.94097.1A
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 Humidex17.414.127.932.542.343.544.449.343.535.026.418.5
Date (yyyy/dd)1995/ 151981/ 221998/ 311990/ 251962/ 171994/ 181999/ 051955/ 011953/ 022007/ 081961/ 031982/ 04
Days with Humidex >= 300.00.00.00.21.38.417.115.04.20.20.00.046.5A
Days with Humidex >= 350.00.00.00.00.22.35.94.60.80.00.00.013.9A
Days with Humidex >= 400.00.00.00.00.00.11.00.50.00.00.00.01.6A
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 (°C)-45-44-36-22-8000-6-12-29-42
Date (yyyy/dd)1981/ 041976/ 022003/ 031954/ 031963/ 011953/ 011953/ 011953/ 011991/ 301969/ 231958/ 301980/ 25
Days with Wind Chill < -2012.18.53.20.10.00.00.00.00.00.00.15.729.6A
Days with Wind Chill < -303.20.90.10.00.00.00.00.00.00.00.00.54.8A
Days with Wind Chill < -400.30.00.00.00.00.00.00.00.00.00.00.00.3A
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)0.30.40.50.71.11.51.81.81.40.90.60.41A
Average Relative Humidity - 0600LST (%)79.17978.678.881.684.485.99090.886.983.381.583.3A
Average Relative Humidity - 1500LST (%)71.668.76356.85759.659.160.56363.969.172.663.7A
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)100.6100.7100.6100.4100.4100.3100.4100.6100.7100.7100.6100.6100.6A
Average Sea Level Pressure (kPa)101.7101.8101.7101.5101.5101.4101.4101.6101.7101.7101.7101.7101.6A
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 km14.414.611.54.53.33.61.53.54.810.98.212.393.2C
1 to 9 km131.8106.192.36063.872.479.288.986.473.291.7122.91068.5C
> 9 km597.7556.3640.3655.5677644.1663.3651.6628.8659.9620.1608.87603.3C
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 tenths158162.5226.9190196.6197.6219239235.6196.9136.11462,304C
3 to 7 tenths101.6106115.9135.9163180.9221.4205.1164.4149.1113.2107.11763.6C
8 to 10 tenths484.4408.4401.3394.1384.4341.6303.7299.9320398470.7490.94697.4C
Frost-Free
1981 to 2010 Canadian Climate Normals station data
Frost-Free
Date/Days Code
Average Date of Last Spring Frost May 01 A
Average Date of First Fall Frost Oct 08 A
Average Length of Frost-Free Period 158 Days A
1981 to 2010 Canadian Climate Normals station data
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 17May 09May 08May 04Apr 28Apr 26Apr 18
Probability of first temperature in fall of 0 °C or lower on or before indicated dates10%25%33%50%66%75%90%
DateSep 25Sep 29Oct 04Oct 07Oct 11Oct 13Oct 20
Probability of frost-free period equal to or less than indicated period (Days)10%25%33%50%66%75%90%
Days137147150157161166173

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.

TRENTON A

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