We've talked before about how July temperatures in Edmonton fall in a fairly narrow band, and we saw that this year with a spread of about 15°C between the coldest and warmest days.
The coldest day last month was July 24 at 15.1°C. That was the second-coldest July 24 High ever recorded in Edmonton, with the all-time coldest being 13.3°C in 1953. For the sake of trivia, in the recorded history of temperatures in Edmonton there have only been 4 July days which didn't break 10°C: July 3 1884 at 7.8°C, July 8 1885 at 8.3°C, July 14 1913 at 9.4°C, and closer to home July 31 2002 at 9°C.
The warmest day this month was July 7th at 30.3°C, which was a recent record, but was still a few degrees below the all-time record of 32.2°C set in both 1894 and 1960.
This chart also highlights how many recent days have been above or below average, and in the last two months the highs have been pretty consistently above average. Looking at August and September we can see that the average Highs stay pretty level for the next month, before starting to dip right at the beginning of September.
Taking a closer look at the numbers, this July we had 4 days above 30°C and 17 above 25°C. That was the same as in 2015, but was quite a few more than we had last July.
Our average High temperature was 25.1°C which is on the warm side of things, but is below the very warm July's of 2006 and 2007, and is actually tied with July 1917 from a century ago.
Low Temperatures
For the Low temperatures we didn't set any all-time or recent records this month, and were split between above and below average.
These charts can be daunting, because there are just so many numbers. But the easiest thing is to just look at the colours - and for July Lows almost everything is the same 10-20°C orange. The lighter-orange shows the night below 10°C, and we had 4 of those last month. The darker-orange is the nights where temperatures stayed above 20°C, and the last time we recorded any of those was in 2007.
Precipitation
If I had needed to guess how much precipitation we had this July, I would have said that it was pretty low. And that guess is partly accurate, and partly not.
At the International Airport the amount of precipitation this July was right on the average with 90mm, but in the city Blatchford recorded barely half that amount at 49mm. Normally the International and Blatchford are pretty close, so I use the International since its data is better. But last month the gap was so large that it is definitely worth mentioning. Looking at the year so far, Blatchford has record 268mm of precipitation compared to 335mm at the International.
This chart also shows the International's 2016 precipitation as a comparison, and 2017 has had a drier summer after a wetter spring.
This chart shows the total, cumulative precipitation so far for 2017 at the International. With 335mm we're getting close to the 350mm-mark, and are sitting right around the 75th percentile.
August Temperatures
As we move into August we can expect that most of the daytime highs will still be above 20°C, and we'll get a week or two above 25°C. 30°C days are a little rare though, and about half of the time August won't have any.
For the Low temperatures it should be a lot of the same 10-20°C orange which we saw for July, but with a few more nights in the 5-10°C range, and every 5 years-or-so a night below 5°C.
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