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Notices:

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Canadian Climate Normals 1971-2000

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.

NOTE!! 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.

ST CATHARINES A *
ONTARIO
Latitude: 43°12'00.000" N Longitude: 79°10'00.000" W Elevation: 97.80 m
Climate ID: 6137287 WMO ID: 71262 TC ID: YSN
Normals from to  
January-June January-December+Year July-December
Temperature:Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Daily Average (°C)-4.1 -3.6 1.1 7.2 13.6 18.8 21.8 20.8 16.6 10.3 4.6 -1.1 8.8 A
Standard Deviation2.6 2.6 2 1.4 1.7 1.3 1.2 1.1 1.1 1.5 1.5 2.5 1.1 A
Daily Maximum (°C)-0.5 0.3 5.4 12.2 19.4 24.3 27.1 25.9 21.5 14.9 8.3 2.4 13.4 A
Daily Minimum (°C)-7.7 -7.4 -3.2 2.1 7.8 13.3 16.4 15.7 11.6 5.6 0.9 -4.5 4.2 A
Extreme Maximum (°C)18.5 19.4 26.7 30.3 32.4 35 37.4 35.6 33.3 28.9 22.2 21.9    
Date (yyyy/dd)1995/14 1997/21 1998/31 1990/25 1987/29 1995/19 1988/07 1973/28 1973/04 1971/02 1977/03 1982/03  
Extreme Minimum (°C)-23.8 -25.7 -21.1 -9.1 -1.7 1.7 8 2.6 0.4 -5 -10.6 -22.5    
Date (yyyy/dd)1994/19 1979/18 1993/12 1982/07 1974/02 1972/11 1984/08 1982/29 1991/29 1975/31 1976/30 1980/25  
Precipitation:
Rainfall (mm)28.8 26.1 46.6 70.2 74.6 82.6 73.6 72.1 91.5 68.5 66.2 44.9 745.7 A
Snowfall (cm)38.7 28.8 20.5 7.2 0.3 0 0 0 0 0.1 9.1 31.9 136.6 A
Precipitation (mm)63.1 51.9 67.9 77.8 74.9 82.5 73.6 72.1 91.5 68.5 75.5 74.2 873.6 A
Average Snow Depth (cm)5 4 2 0 0 0 0 0 0 0 0 2 1 A
Median Snow Depth (cm)4 3 1 0 0 0 0 0 0 0 0 1 1 A
Snow Depth at Month-end (cm)3 4 0 0 0 0 0 0 0 0 0 3 1 A
Extreme Daily Rainfall (mm)39.8 40.4 35.8 49.3 44.2 65.2 66 51.4 67 51 48 34.4    
Date (yyyy/dd)1995/20 1990/22 1985/31 1976/25 1986/19 1981/22 1971/13 1987/09 1979/14 1995/05 1973/15 1990/29  
Extreme Daily Snowfall (cm)30 46.8 26 20.4 8 0 0 0 0 1.4 19 20    
Date (yyyy/dd)1996/03 1984/28 1999/06 1994/06 1989/07 1971/22 1971/01 1971/01 1971/01 1993/31 1997/14 1977/05  
Extreme Daily Precipitation (mm)39.8 40.4 42.4 49.3 44.2 65.2 66 51.4 67 51 48 34.4    
Date (yyyy/dd)1995/20 1990/22 1973/17 1976/25 1986/19 1981/22 1971/13 1987/09 1979/14 1995/05 1973/15 1990/29  
Extreme Snow Depth (cm)63 50 45 21 5 0 1 0 0 0 24 23    
Date (yyyy/dd)1999/16 1984/29 1984/01 1979/10 1989/07 1971/22 1992/31 1971/01 1971/01 1971/01 1989/18 1992/11  
Days with Maximum Temperature:
<= 0 °C16.8 14.1 6.5 0.48 0 0 0 0 0 0 1.3 9.8 49 A
> 0 °C14.3 14.2 24.5 29.5 31 30 31 31 30 31 28.7 21.2 316.3 A
> 10 °C1.3 1.6 6.7 18 29.6 30 31 31 30 25.3 10.3 2.6 217.3 A
> 20 °C0 0 0.83 3.1 13.3 25 30.3 29.7 18.2 5.3 0.67 0.07 126.5 A
> 30 °C0 0 0 0.03 0.61 2.5 6.6 3.3 0.67 0 0 0 13.7 A
> 35 °C0 0 0 0 0 0 0.27 0.07 0 0 0 0 0.34 A
Days with Minimum Temperature:
> 0 °C2.8 3.1 7.8 20.1 30.8 30 31 31 30 28 15.9 5.6 236.1 A
<= 2 °C30 27.1 27.2 15.9 2.1 0.03 0 0 0.30 6.6 19.3 28.5 157.2 A
<= 0 °C28.2 25.2 23.2 9.9 0.25 0 0 0 0 3 14.1 25.4 129.2 A
< -2 °C24.6 22.1 18 4 0 0 0 0 0 0.73 7.1 19.7 96.2 A
< -10 °C11.4 9.6 3.1 0 0 0 0 0 0 0 0.07 4.7 28.8 A
< -20 °C0.57 0.21 0.03 0 0 0 0 0 0 0 0 0.07 0.88 A
< - 30 °C0 0 0 0 0 0 0 0 0 0 0 0 0 A
Days with Rainfall:
>= 0.2 mm5.6 5.2 8.9 12 11.5 10.8 9.2 9.8 10.9 11.9 11.4 8.1 115.4 A
>= 5 mm1.9 1.5 3 4.8 4.8 4.9 4.2 4.1 5.4 4.5 4.4 3.1 46.6 A
>= 10 mm0.76 0.79 1.4 2.6 2.7 3 2.4 2.3 3 2.4 2 1.5 24.9 A
>= 25 mm0.14 0.07 0.17 0.38 0.39 0.62 0.63 0.63 0.80 0.30 0.37 0.17 4.7 A
Days With Snowfall:
>= 0.2 cm12.6 10.1 6.3 2.5 0.04 0 0 0 0 0.13 3.2 9.8 44.6 A
>= 5 cm2.6 1.7 1.2 0.41 0.04 0 0 0 0 0 0.53 2.1 8.6 A
>= 10 cm0.72 0.55 0.48 0.17 0 0 0 0 0 0 0.20 0.70 2.8 A
>= 25 cm0.07 0.03 0.03 0 0 0 0 0 0 0 0 0 0.13 A
Days with Precipitation:
>= 0.2 mm16.6 14 13.5 13.6 11.5 10.8 9.2 9.8 10.9 12 13.8 15.4 151 A
>= 5 mm4.1 2.9 4.5 5.2 4.8 4.9 4.2 4.1 5.4 4.5 5.1 5 54.7 A
>= 10 mm1.3 1.3 2 2.8 2.7 3 2.4 2.3 3 2.4 2.3 2.2 27.8 A
>= 25 mm0.24 0.14 0.31 0.45 0.43 0.62 0.63 0.63 0.80 0.30 0.37 0.30 5.2 A
Days with Snow Depth:
>= 1 cm18.3 15.9 7.4 1.3 0.04 0 0.03 0 0 0 1.9 11 56 A
>= 5 cm12.5 8.6 4 0.38 0.04 0 0 0 0 0 0.83 6 32.3 A
>= 10 cm5.7 3.4 1.8 0.21 0 0 0 0 0 0 0.24 2 13.3 A
>= 20 cm1.3 0.69 0.36 0.07 0 0 0 0 0 0 0.03 0.11 2.5 A
Wind:
Speed (km/h)21.1 19.2 18.5 17.3 14.5 13.9 13.2 12.4 13.6 15.4 18.2 19 16.4 C
Most Frequent DirectionSW SW SW SW SW SW SW SW SW SW SW SW SW C
Maximum Hourly Speed (km/h)89 63 74 74 65 65 63 59 53 63 70 70    
Date (yyyy/dd)1978/26 1985/12 1982/31 1982/03 1997/01 1990/03 1977/01 1990/28 1976/10 1983/28 1988/10 1977/01  
Maximum Gust Speed (km/h)137 87 111 137 96 115 107 102 133 94 111 106    
Date (yyyy/dd)1978/26 1985/12 1991/28 1982/03 1990/10 1978/12 1991/05 1995/01 1980/02 1981/18 1988/10 1971/15  
Direction of Maximum GustS E SW SW SW SW S W W SW SW SW S  
Days with Winds >= 52 km/h3.1 1.5 2 1.1 0.8 0.4 0.2 0.2 0.3 0.8 0.9 1.4 12.6 D
Days with Winds >= 63 km/h0.7 0.2 0.4 0.4 0.2 0.1 0.1 0.1 0.1 0.1 0.3 0.3 2.7 D
Degree Days:
Above 24 °C0 0 0 0 0.3 3.8 14.5 7.3 1.9 0 0 0 27.7 A
Above 18 °C0 0 0.2 1.3 15.5 60.1 121.4 97 33.1 2.2 0 0 330.7 A
Above 15 °C0 0 0.9 4.6 39 124.2 210.8 181.4 77.5 10.2 0.8 0 649.5 A
Above 10 °C0.5 0.1 5.8 24.7 126 264.4 365.6 335.3 199.9 59.2 10.6 1.3 1393.4 A
Above 5 °C3.5 3.7 25.5 92.1 267.2 414.3 520.6 490.3 347.7 168.8 49.7 9.6 2392.9 A
Above 0 °C23.5 26.3 84.9 217.5 422 564.3 675.6 645.3 497.7 318.7 147 47.6 3670.2 A
Below 0 °C154.5 126.7 50.8 3.2 0 0 0 0 0 0 8.6 80.2 424 A
Below 5 °C289.6 245.5 146.4 27.7 0.2 0 0 0 0 5.1 61.3 197.2 973 A
Below 10 °C441.5 383.3 281.7 110.3 14 0.1 0 0 2.2 50.6 172.2 343.9 1799.9 A
Below 15 °C596.1 524.6 431.9 240.3 82 9.9 0.2 1.1 29.8 156.6 312.4 497.6 2882.3 A
Below 18 °C689.1 609.4 524.1 326.9 151.5 35.8 3.8 9.7 75.4 241.5 401.6 590.6 3659.4 A
Humidex:
Extreme Humidex20.8 20.2 29.3 34.5 40.5 44.5 46.1 45.9 42 33.8 27.1 25    
Date (yyyy/dd)1995/14 1997/21 1998/30 1990/25 1987/30 1994/16 1995/14 1995/15 1991/15 2002/04 1971/02 1982/03  
Wind Chill:
Extreme Wind Chill-42 -34.6 -25.9 -19.7 -5.8 2.6 6.9 2.1 -1.3 -8.3 -18.9 -28    
Date (yyyy/dd)1982/17 1976/02 1984/08 1982/07 1978/01 1980/10 2001/02 1982/29 1974/23 1974/19 1987/21 1983/30  


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Date Modified: 2013-02-04

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