St. Catharines Snowfall Totals & Accumulation Averages





This page pulls together information on when, how much and how often St. Catharines, Ontario has snow.

There are data and descriptions here of how many days it snows and the total amount of snowfall that St. Catharines usually gets. There are also monthly and yearly counts of the days that St. Catharines normally has heavy snowstorms and deep snow accumulated on the ground. Plus there's information on when the city can expect its first and last snowfalls of the season.

All the numbers are long-term historical averages based on weather data gathered from 1981 to 2010 at the Niagara District Airport.

How Often it Snows in St. Catharines

This first table lists monthly and yearly totals for amount of snow and how many days it snows at least 0.2 centimetres (0.08 inches).

Average total snowfall and days with fresh snow in St. Catharines
Days   Inches Centi­metres
12.3 January 15.2 39
9.1 February 11.5 29
6.5 March 9.1 23
2.4 April 2.3 6
0.1 May 0.2 0
0.1 October 0.0 0
3.0 November 3.8 10
9.4 December 11.8 30
42.7 Year 54.0 137

When St. Catharines Has Its First & Last Snowfalls

The first snowfall of winter for St. Catharines often arrives in November, but can show up as early as October.

The season's last snowfall typically happens in March or April, although a late snow can land in May.

St. Catharines is normally free of snow every year from June to September.

How Many Snowstorms St. Catharines Gets

Most days of snowfall in St. Catharines leave less than five centimetres (2 inches) of fresh snow on the ground. For nine days a year on average, the amount of new snow totals at least five cm.

Big snowstorms of over ten cm a day normally occur three times a year. But major blizzards that dump 25 cm or more in one day are rare events that happen about twice a decade. Storms this severe are most likely to appear in January or February.

Number of days per month and year on average in St. Catharines with a total snowfall of at least 5, 10 or 20 centimetres
  5 cm
2.0 inches
10 cm
3.9 inches
25 cm
9.8 inches
January 2.8 0.8 0.1
February 2.0 0.7 0.1
March 1.4 0.6 0.1
April 0.3 0.1 0.0
May 0.1 0.0 0.0
November 0.6 0.3 0.0
December 2.0 0.7 0.0
Year 9.0 3.1 0.2

How Much Snow Normally Accumulates in St. Catharines

For about 56 days a year, St. Catharines has at least a centimetre of snow on the ground. In mid-winter the snowpack averages three to five cm deep.

Average total days per month and year in St. Catharines with snow depth of at least 1, 5, 10 or 20 cm on the ground
1 cm
0.4 inches
5 cm
2.0 inches
  10 cm
3.9 inches
20 cm
7.9 inches
18.7 13.2 January 6.2 1.7
14.5 8.1 February 4.4 1.0
8.6 4.8 March 2.6 0.5
1.2 0.3 April 0.2 0.1
0.1 0.1 May 0.0 0.0
2.1 1.0 November 0.4 0.1
11.0 5.7 December 1.8 0.2
56.1 33.1 Year 15.5 3.4
Reference

Environment Canada. Meteorological Service of Canada. Canadian Climate Normals. 1981-2010 Climate Normals & Averages.

Environment Canada. National Climate Data and Information Archive. Canadian Climate Normals or Averages 1971-2000.

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