Wet Octobers & Snow

Friday night Tom Tasselmyer pulled together some preliminary statistics on October rainfall and subsequent winter snowfall. The final October numbers are in now and here are some of the conclusions.

October 2009 ties with October 1995 as the 12th. wettest on record with 6.24 inches at the official recording station at BWI-Marshall Airport.

Records date back into the late 1800s and were recorded at various locations around the city. In that time, 13 Octobers had 6 or more inches of rain. The average seasonal snowfall following those Octobers is 25.6 inches.

The average snowfall following the 10 wettest Octobers is 19.2 inches. Six of those winters were above average snow seasons and four were below average. The average Baltimore snowfall for the most recent climatological period (1971-2000) is 18.2 inches.

The statistics highlighted above would suggest that excessively wet Octobers might be indicators of snowy winters. It will be interesting to see if statistics like these reveal anything about weather patterns.

The graphic below highlights a few of those wet and snowy statistics.


John Collins


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