Sunday, May 2, 2010

April 2010 Summary

Warmest April in 55 years and finally an average month for precipitation

Just like March, it was another warm month, this one was 3.4 degrees above average, making it the warmest April since 1955 and tied for the forth warmest in the 90+ years of record keeping in the area. As well, the last time we had two consecutive months that were more than 3 degrees above average were the months of January and February of 2002.

We had 24 warmer than average days, 11 that were more than 5 degrees above average and only 3 days that were more than 5 degrees below average. I was also never able to find an April in the area when the lowest temperature was only -2.3 °C or put another way in every other April it always got colder than -2.3 °C.

For the first time this year we had an average month for precipitation with 67.6 mm coming down compared to an average of 76.9 mm. Of course 51.6 mm of this came during a 3 day period early in the month, so the rest of the month was dry.

It has been a dry start to the year with only about two thirds of the typical amount falling during the first four months of the year. In the past 45 years this is the second least amount of precipitation we have had at this point in the year (we had a little less in 2003).

I could have done this last month, but I think it is now safe to call an end to the 09/10 snowfall season. We only had 78 cm during the month which is less than half of the average amount (159.5 cm) and a lot less than what we saw during the two previous winters – 257.7 cm in 07/08 and 235 cm in 08/09.


Summary for April 2010:
Maximum Temperature 26.3 °C
Minimum Temperature -2.3 °C
Average Daily High Temperature 15.7 °C (Long term average 11.4 °C)
Average Daily Low Temperature 3.0 °C (Long term average 0.6 °C)
Total Precipitation 67.6 mm (Long term average 76.9 mm)

(Long term averages based on 1971-2000 data for the Waterloo Wellington Airport)



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4 comments:

Anonymous said...

Interesting note about April from what I saw - the majority of the below-average temperature days came on the weekends. Might have not been appreciated by everyone since the weekdays were a lot better than the weekends in April.

Kuhny said...

And the comments above seem to be applying into May. While the first weekend at least was warm, the next weekend (May 8/9) may be much colder than normal (and wet) again.

Unknown said...

May 8th, 2010. Chance of snow tonight. What is latest we have had snow in Waterloo Region?

Frank said...

Again it really depends on how you classify "having snow".

There was definitely some frozen precipitation falling at some points today. But of course none of it stuck on the ground. We will have to see if there is any on the ground tomorrow morning.

The last time we had a "trace" of snow in May was back in 1996 while in 1989 there was 1.4 cm recorded at the Waterloo-Wellington Airport.