Monday, September 2, 2019

August 2019 Summary

A hot August with average precipitation

In contrast to last year when the overall August temperature was almost 3 degrees above average, this year it was only 0.9 degree higher than average, putting it just into the above average range.  There was a definite shift part way through the month with the average temperature dropping a degree before and after the 21st, this shift can be clearly seen in the graphs.

About three quarters of the month’s precipitation came during 5 very wet days during the middle of the month, with the rest of the month being relatively dry.  The total of 89.4 mm was not enough above the average of 83.9 mm to put it outside of the average range for August.

The total precipitation we have seen so far in 2019 of 616.0 mm is still above the average of 596.0 mm for this time of year.

Summary for August 2019:
Maximum Temperature 29.8°C
Minimum Temperature 7.6°C
Average Daily High Temperature 25.9°C (Long term average 24.8°C)
Average Daily Low Temperature 13.5°C (Long term average 12.9°C)
Total Precipitation 89.4 mm (Long term average 83.9 mm)

(Long term averages based on 1981-2010 data for the Waterloo-Wellington Airport)

Saturday, August 3, 2019

July 2019 Summary

A very hot and dry July

Although it wasn’t the hottest month ever (as has been reported for the global temperature), locally it was still over 2 degrees higher than average making the hottest month since July of 2012.  It was also the first above average month we have seen this year, as well the 9 days over 30°C was well above the average of only 3.5 days.

July was very dry with only 39.8 mm of rain which is less than half the average of 98.6 mm.  It also wasn’t spread out very well with over half of the total coming on the 17th, leaving only a little bit more to be spread over the rest of the month.

This dry month brought the total precipitation for the year of 526.6 mm back down closer the average of 509.0 mm.

Summary for July 2019:
Maximum Temperature 33.3°C
Minimum Temperature 10.4°C
Average Daily High Temperature 28.7°C (Long term average 26.0°C)
Average Daily Low Temperature 15.8°C (Long term average 14.0°C)
Total Precipitation 39.8 mm (Long term average 98.6 mm)

(Long term averages based on 1981-2010 data for the Waterloo-Wellington Airport)

Monday, July 1, 2019

June 2019 Summary

A very average June for both temperature and precipitation

In contrast to the last few years when there were lots of June days at or above 30°C (8 in 2016, 3 in 2017, and 4 in 2018), there was only one day this past June when it just barely made it to 30°C.  Despite this, there were enough warm days to put the overall temperature at almost exactly at the average (well 0.04 degrees above, but let’s say that rounds off to 0.0).   The also marks the first month this year that was not at least a little bit below average.

There was also a pretty regular series of moderate storms that came through during the month to keep the precipitation within the average range, although the total precipitation of 73.6 mm was below the long term 1981-2010 average of 82.4 mm.

For the first half of the year, the total precipitation we have seen of 486.8 mm is not that far above what we would expect for the halfway mark of 416.1 mm.

Summary for June 2019:
Maximum Temperature 30.0°C
Minimum Temperature 4.4°C
Average Daily High Temperature 23.6°C (Long term average 23.6°C)
Average Daily Low Temperature 11.6°C (Long term average 11.5°C)
Total Precipitation 73.6 mm (Long term average 82.4 mm)

(Long term averages based on 1981-2010 data for the Waterloo-Wellington Airport)

Monday, June 3, 2019

May 2019 Summary

A cooler May (but still barely average) with lots of rain

Last year after a cold April, May came back extremely warm, this year not so much.  The first half of the month was about a full degree below average, but the second half was warm enough to put us at 0.7 degrees less than average overall for the month.  This was just warm enough to keep it within the average range.

Also, unlike last year when we had 3 days above 30°C, the highest temperature for May this year was only 27.5°C.  You have to go back 10 years to find a lower highest temperature of the month.

On the other end of the termometer, we didn’t have a temperature below zero during May, so that means the last one occurred on April 29.  This is on the early end of the range of Apr 26 to May 23 for the last below zero temperature we have seen in 20+ years of data at the UW Weather Station.

It was a wet month with a pretty good soaking every week or so that put the total of 103.4 mm well above the average of 82.3 mm.  With 4 wetter than average months in a row, it is not surprising that the total for the year is now 413.2 mm is now much higher than the 340.2 mm that we would expect for this time of the year.

Summary for May 2019:
Maximum Temperature 27.5°C
Minimum Temperature 0.5°C
Average Daily High Temperature 17.4°C (Long term average 18.5°C)
Average Daily Low Temperature 6.1°C (Long term average 6.4°C)
Total Precipitation 103.4 mm (Long term average 82.3 mm)

(Long term averages based on 1981-2010 data for the Waterloo-Wellington Airport)

Thursday, May 2, 2019

April 2019 Summary

An April that was colder and wetter than average, but maybe not unexpected

The few warm days were more than offset by many more cooler days putting the month at one degree below average overall.  But those averages are based on the 1981-2010 long term values and one of the shifts we have seen the past 10 years has been for much cooler spring months.

So if you were to compare this past April with just the last 5 years it would have been just average for temperature.  That’s why I said although the month was colder than the long term average maybe it wasn’t wholly unexpected when compared to the most recent years.

The precipitation was following the average until halfway through the month, but then we saw a lot of rain in the second half including 2 days with over 20 mm.  The final total was 117.2 mm which is much above the average of 74.5 mm.

It has also been a wet year so far with the total precipitation for the year now of 309.8 mm which is much more than the 264.4 mm we would expect at the end of April.

We didn’t get any measurable snow during April (there were times when it fell from the sky but didn’t stick on the ground).  Thus the total of 133.5 cm for the snowfall season was well below the average of 159.7 cm.

Summary for April 2019:
Maximum Temperature 19.6°C
Minimum Temperature -9.1°C
Average Daily High Temperature 9.9°C (Long term average 11.5°C)
Average Daily Low Temperature 0.5°C (Long term average 0.8°C)
Total Precipitation 117.2 mm (Long term average 74.5 mm)

(Long term averages based on 1981-2010 data for the Waterloo-Wellington Airport)