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.

PORT COLBORNE *
ONTARIO

* 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)-3.7-2.90.87.013.218.721.921.317.411.05.5-0.49.2A
Standard Deviation2.82.21.51.31.71.31.21.21.21.21.32.60.9A
Daily Maximum (°C)-0.40.64.811.517.923.125.925.421.314.88.72.713.0A
Daily Minimum (°C)-6.9-6.5-3.22.48.514.417.817.213.47.32.2-3.45.3A
Extreme Maximum (°C)15.016.024.032.531.533.535.033.031.027.220.018.0
Date (yyyy/dd)2005/ 131981/ 221990/ 151990/ 282006/ 301995/ 202005/ 121988/ 022000/ 011971/ 031977/ 032001/ 05
Extreme Minimum (°C)-26.0-25.0-24.0-11.5-3.52.26.05.0-0.5-6.1-11.5-26.0
Date (yyyy/dd)1981/ 041979/ 181980/ 011982/ 071978/ 011972/ 112001/ 021982/ 281993/ 301965/ 291987/ 211980/ 25
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)32.526.946.671.989.178.982.282.598.089.795.253.2846.8A
Snowfall (cm)40.530.120.24.20.60.00.00.00.00.85.835.6137.7A
Precipitation (mm)73.157.066.876.189.778.982.282.598.090.4100.988.8984.6A
Extreme Daily Rainfall (mm)46.529.534.839.041.0108.774.0102.096.072.678.238.6
Date (yyyy/dd)1998/ 071976/ 211991/ 271996/ 122004/ 221968/ 252004/ 302005/ 302004/ 081995/ 051985/ 041986/ 02
Extreme Daily Snowfall (cm)40.633.527.016.810.20.00.00.00.013.039.130.5
Date (yyyy/dd)1966/ 221972/ 192004/ 161975/ 041989/ 061965/ 011964/ 011964/ 011964/ 012006/ 121969/ 192001/ 24
Extreme Daily Precipitation (mm)46.533.534.839.041.0108.774.0102.096.072.678.238.6
Date (yyyy/dd)1998/ 071972/ 191991/ 271996/ 122004/ 221968/ 252004/ 302005/ 302004/ 081995/ 051985/ 041986/ 02
Extreme Snow Depth (cm)351232170000020715
Date (yyyy/dd)1996/ 032002/ 271998/ 232005/ 041983/ 011983/ 011983/ 011983/ 011983/ 012006/ 132005/ 261995/ 20
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 °C15.7136.60.270000000.92945.5C
> 0 °C15.315.224.429.731303131303129.122319.7C
> 10 °C0.720.795.816.629.13031313025.5111.9213.3C
> 20 °C000.282.21022.530.429.718.23.200116.6C
> 30 °C0000.040.040.811.10.880.120003C
> 35 °C0000000000000C
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 °C3.73.17.72130.73031313029.4198244.6C
<= 2 °C29.827.627.714.81.70000.09516.226.7149.7C
<= 0 °C27.325.223.390.3500001.61123120.7C
< -2 °C22.120.216.22.6000000.164.416.582.1C
< -10 °C8.87.330.040000000.12423.2C
< -20 °C0.520.2000000000000.72C
< - 30 °C0000000000000C
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 mm6.25.38.713.213.311.210.610.311.813.413.99127.1A
>= 5 mm2.22.23.54.75.954.44.45.25.86.43.553.1A
>= 10 mm10.921.42.5332.92.93.23.23.21.728.7A
>= 25 mm0.080.040.080.230.580.600.730.810.880.480.480.285.3A
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 cm9.66.64.51.40.0800000.121.97.131.3A
>= 5 cm2.92.21.70.270.0800000.040.362.910.4A
>= 10 cm10.840.580.080.0400000.040.121.23.9A
>= 25 cm0.080.080.04000000000.040.24A
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 mm15.211.112.513.813.311.210.610.311.813.415.114.9153.2A
>= 5 mm5.24.45.24.95.954.44.45.25.876.663.9A
>= 10 mm2.11.822.5332.92.93.23.23.42.932.9A
>= 25 mm0.160.120.190.230.580.600.730.810.880.480.480.325.6A
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 cm220120.57000000.060.2920
>= 5 cm1706.50.14000000.060.2910
>= 10 cm9040.14000000.06000
>= 20 cm2020000000.06000
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 °C0000028.98.11.300020.3C
Above 18 °C0000.56.455.4122.9110.540.52.800339C
Above 15 °C0002.426.2121213198.493.713.90.20668.7C
Above 10 °C001.419.9113.3262.3367.8352.6223.671.711.10.91424.7C
Above 5 °C2.11.416.785.1254.2412.3522.8507.6372.2189.560.210.42434.3C
Above 0 °C23.821.974.4210.4408.9562.3677.8662.6522.2342.1169.657.43733.2C
Below 0 °C137108.151.42.50000005.669.9374.5C
Below 5 °C270.3228.6148.727.20.300002.546.2177.9901.6C
Below 10 °C423.2368.3288.411214.40.1001.539.6147.1323.51,718C
Below 15 °C578.2509.3442244.582.38.80.20.721.6136.8286.2477.52,788C
Below 18 °C671.2593.9535332.6155.533.23.25.958.3218.7376.1570.53553.9C
Frost-Free
1981 to 2010 Canadian Climate Normals station data (Frost-Free)
Frost-Free
Date/Days Code
Average Date of Last Spring Frost Apr 25 C
Average Date of First Fall Frost Oct 26 C
Average Length of Frost-Free Period 182 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 09May 03Apr 29Apr 28Apr 24Apr 22Apr 14
Probability of first temperature in fall of 0 °C or lower on or after indicated dates10%25%33%50%66%75%90%
DateOct 08Oct 16Oct 19Oct 24Oct 30Nov 04Nov 07
Probability of frost-free period equal to or less than indicated period (Days)10%25%33%50%66%75%90%
Days159165172183188191196

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.

PORT COLBORNE

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