Sunday, August 14, 2016

Victoria's advantage when the weather is unsettled

We're currently into a perfect stretch of warm, dry and sunny summer weather: take a look at the forecast for Victoria for the next week.



However, it seems like earlier in the summer the weather was a bit more unsettled than usual, especially in June and the first half of July.  While we might complain when the weather's not perfect in the summer, we should remember that compared with other locations in the region, Victoria's weather actually stands out the most when the weather pattern is a bit more unsettled.  When we have a strong ridge of high pressure giving us the sunny weather we're currently experiencing, other parts of the B.C. south coast are usually experiencing similar conditions.  It's when the weather's unsettled that Victoria's climate really shines.  Unsettled weather during the summer might mean a little more cloud and a chance of sprinkles in Victoria, while in other parts of the region they are getting much more cloud and rain.

Let's start by comparing the rainfall in Victoria and Vancouver this summer.  The chart below compares monthly rainfall from May up until today (August 14) at Victoria Gonzales and Vancouver Harbour (downtown).  You can see that Vancouver has clearly had a LOT more rain.

Summer 2016 Monthly Rainfall, Victoria vs. Vancouver

On average, Vancouver gets about three times as much rainfall from May to August than Victoria (240 mm vs. 80 mm).  This year, Vancouver has had five times as much rain as Victoria (224 mm vs 45 mm).

The chart below compares the total May-August 2016 rainfall (up to August 14) at Victoria Gonzales with several other  locations in the region.  Although the Victoria Airport usually gets about 35-40% more rain than Victoria Gonzales during the summer, this year it's been almost as dry.  However, Vancouver Airport (located in a relatively dry part of the Vancouver region) has had more than three times as much rain as Victoria, and as we've seen, Vancouver Harbour has seen five times as much rain.  Nanaimo, Comox, and Campbell River - which normally get about twice as much rain as Victoria during the summer - have received nearly three times as much rain as Victoria this summer. Finally, Seattle Airport - which normally gets about 60% more rain than Victoria during the summer - has received about double Victoria's rainfall this summer.

Total Rainfall, May to August 2016

So during this somewhat unsettled summer, other locations in the region have received even more rain relative to Victoria than they normally do.  We might grumble sometimes when we get a patch of unsettled weather in the summer instead of the endless sunny days that we expect, but we should keep in mind that when it's unsettled here in Victoria, it's probably still a lot better weather than other parts of the region.

While we're talking about the rainfall amounts this summer, I'd just like to comment on another case of it all being relative.  We've heard in the news that Southern Ontario is experiencing a severe drought this summer.  In Toronto, they have received just 45% of their normal rainfall since the beginning of May.  Sounds pretty dry, doesn't it?  The thing is, normal May-August rainfall in Toronto is 300 mm, so 45% of that is 135 mm - or about three times as much rain as Victoria has seen over the same period.  For Victoria, 135 mm of rain during May to August would be an unusually wet summer, and certainly wouldn't be considered a severe drought!  In fact, in 117 years of record-keeping at Victoria Gonzales, there have only been five summers where our rainfall totals have reached 135 mm.  As I said, it's all relative!

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