Canadian Climate Normals 1971-2000 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
ST THOMAS WPCP
ONTARIO
Latitude: 42°46'06.006" N Longitude: 81°12'18.042" W Elevation: 209.10 m
Climate ID: 6137362 WMO ID: TC ID:
1971 to 2000 Canadian Climate Normals station data
 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Temperature:
Daily Average (°C)-4.8 -3.7 1 7.4 13.8 18.6 21 20.2 16.1 10 4.1 -1.8 8.5 LegendCC
Standard Deviation2.7 2.6 1.9 1.4 2.1 1.3 1.1 1.3 0.8 1.5 1.4 3 1 LegendCC
Daily Maximum (°C)-0.9 0.6 5.6 12.9 19.9 24.5 26.8 25.8 21.5 15.1 7.8 1.7 13.4 LegendCC
Daily Minimum (°C)-8.6 -7.9 -3.7 2 7.8 12.6 15.2 14.6 10.7 4.9 0.3 -5.3 3.5 LegendCC
Extreme Maximum (°C)14.5 18.5 24.5 29.5 32.5 38 37 34.5 32.5 26 21.5 18.5   Legend
Extreme Minimum (°C)-31 -30 -23.5 -16 -3 1 6 0 -2 -7 -13.5 -27.5   Legend
Precipitation:
Rainfall (mm)36.8 37.2 51.5 81.4 83.2 101.8 86.4 87.7 96.8 83.2 89.4 61.3 896.7 LegendCC
Snowfall (cm)38.1 27 16.9 3.5 0 0 0 0 0 0.3 6.9 27.3 120 LegendCC
Precipitation (mm)74.9 64.2 68.4 85 83.2 101.8 86.4 87.7 96.8 83.5 96.3 88.5 1016.6 LegendCC
Extreme Daily Rainfall (mm)43.5 40.4 32 55.8 65.4 77.4 50 57 89.6 72 52.2 34.4   Legend
Extreme Daily Snowfall (cm)25 24 21.5 12 0 0 0 0 0 2.5 16.4 28   Legend
Extreme Daily Precipitation (mm)43.5 40.4 32 55.8 65.4 77.4 50 57 89.6 72 52.2 34.4   Legend
Extreme Snow Depth (cm)48 27 19 4 0 0 0 0 0 0 9 27   Legend
Days with Maximum Temperature:
<= 0 °C16.2 13 5.5 0.30 0 0 0 0 0 0 1.5 11 47.4 LegendDD
> 0 °C14.8 15.3 25.5 29.7 31 30 31 31 30 31 28.5 20 317.9 LegendDD
> 10 °C0.58 1.1 7.1 20.5 30.2 30 31 31 30 26 9.4 1.9 218.5 LegendDD
> 20 °C0 0 0.65 3.2 14 25.6 30.6 29.5 18.4 4.4 0.10 0 126.5 LegendDD
> 30 °C0 0 0 0 0.20 1.8 3.5 1.7 0.14 0 0 0 7.3 LegendDD
> 35 °C0 0 0 0 0 0.05 0.19 0 0 0 0 0 0.24 LegendDD
Days with Minimum Temperature:
> 0 °C2.8 2.9 7.4 18.4 29.1 30 31 31 29.7 25.9 13.9 5.1 227.1 LegendDD
<= 2 °C30.3 27.4 27 16.4 4.5 0.20 0 0.10 1.1 10 20.7 29 166.6 LegendDD
<= 0 °C28.2 25.3 23.7 11.6 2 0 0 0.05 0.30 5.1 16.1 25.9 138.2 LegendDD
< -2 °C24.1 20.9 17.6 5 0.05 0 0 0 0 1.3 8.5 19.2 96.6 LegendDD
< -10 °C11.6 9.8 3.7 0.15 0 0 0 0 0 0 0.43 7.1 32.7 LegendDD
< -20 °C2.2 1.6 0.35 0 0 0 0 0 0 0 0 0.62 4.7 LegendDD
< - 30 °C0.10 0 0 0 0 0 0 0 0 0 0 0 0.10 LegendDD
Days with Rainfall:
>= 0.2 mm6.1 6 9.7 14.9 13.1 11.6 12.8 11.4 14 14.1 13.6 8.8 135.9 LegendCC
>= 5 mm2.4 2.3 3.5 5.4 4.8 5.4 5.1 4.8 5.2 4.9 5.7 3.6 53 LegendCC
>= 10 mm1.1 1.1 1.8 2.4 2.7 3.2 2.9 3 3.2 2.8 3.1 2.1 29.1 LegendCC
>= 25 mm0.30 0.25 0.30 0.40 0.57 1.1 0.67 0.71 0.76 0.52 0.67 0.48 6.7 LegendCC
Days With Snowfall:
>= 0.2 cm9.6 7.3 4.1 1.3 0 0 0 0 0 0.19 2.5 7.3 32.2 LegendCC
>= 5 cm2.6 1.9 1.3 0.25 0 0 0 0 0 0 0.38 2.1 8.5 LegendCC
>= 10 cm0.95 0.80 0.55 0.05 0 0 0 0 0 0 0.10 0.57 3 LegendCC
>= 25 cm0.05 0 0 0 0 0 0 0 0 0 0 0.05 0.10 LegendCC
Days with Precipitation:
>= 0.2 mm14.8 11.9 12.4 15.9 13.1 11.6 12.8 11.4 14 14.1 15.5 14.6 162 LegendCC
>= 5 mm5 4.2 5 5.7 4.8 5.4 5.1 4.8 5.2 5 6 5.9 61.8 LegendCC
>= 10 mm2.1 2.1 2.4 2.5 2.7 3.2 2.9 3 3.2 2.8 3.2 2.6 32.6 LegendCC
>= 25 mm0.35 0.30 0.30 0.40 0.57 1.1 0.67 0.71 0.76 0.52 0.67 0.52 6.9 LegendCC
Degree Days:
Above 24 °C0 0 0 0 0 2.3 6.8 3.3 0.5 0 0 0 12.9 LegendDD
Above 18 °C0 0 0 1 12.4 54 100.1 80.8 26.3 0.8 0 0 275.4 LegendDD
Above 15 °C0 0 0.6 4.7 39.9 117.4 186.9 162.3 69 7.4 0.2 0.1 588.3 LegendDD
Above 10 °C0 0.1 5.5 27 131.7 256.9 341.9 315.5 187.6 51.1 6.7 0.9 1324.9 LegendDD
Above 5 °C1.8 2.1 24.2 98.5 273.9 406.6 496.9 470.5 334.4 159.5 40.3 7.3 2316.1 LegendDD
Above 0 °C18.9 22.4 83.5 226.5 428.7 556.6 651.9 625.5 484.4 310 132.3 40.3 3580.9 LegendDD
Below 0 °C160 125.9 53 3.2 0 0 0 0 0 0 10.2 95.4 447.7 LegendDD
Below 5 °C297.9 246.7 148.8 25.3 0.2 0 0 0 0 4.5 68.2 217.5 1009 LegendDD
Below 10 °C451 385.8 285 103.7 12.9 0.3 0 0 3.3 51.1 184.6 366.1 1843.8 LegendDD
Below 15 °C606 526.9 435.1 231.4 76.2 10.8 0.1 1.7 34.6 162.3 328.1 520.2 2933.4 LegendDD
Below 18 °C699 611.6 527.5 317.7 141.6 37.4 6.3 13.2 82 248.8 417.9 613.1 3716.2 LegendDD
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