It was a good year for the bees for most of 2008 with relatively mild temperatures and reasonable weather. Granted, our record breaking -8 degrees on April 21 was an unwelcomed surprise, and the June blizzard wasn’t much of a help except for providing much needed moisture, but the hives weathered all of it without a problem. Now I’m not so sure.
We’ve endured sub-zero temperatures for over a week with many, many nights dipping below -20F. A few days have cracked single digits, but for the most part, we’re the epitome of a big deepfreeze.
Grant stacked bales of straw along the west side of the hives to help buffer them against our gale force winds, but particularly with last week’s blizzard, there was virtually no way to adequately protect them. Any tiny crack – whether in the garden shed or the front of my truck – allowed snow to fill an area. I shudder to think how much found its way into the hives.
Honeybees live through the winter by clustering in the middle of the hive keeping the queen warm in the middle of thousands of tiny bodies. Grant placed a thermograph in a hive years ago (although not squarely in the middle), and one on the hive’s exterior to record the temperature variation. At times there is nearly a one-hundred degree difference. It can be -20 outside, and a healthy hive will stay well above 80-degrees inside. This is pretty remarkable considering these tiny creatures keep it warm through muscular contractions. Basically they’re shivering to produce heat.
But with temperatures this cold for this long, it can be tough for the girls to hold it together. (The drones were kicked out after the first hard freeze, by the way. There’s no room for slackers during the winter.) In winters past, we’ve insulated the hives with the rigid foam, but for so many seasons it’s almost caused more trouble than it was worth since the temperatures weren’t as extreme. Plus, ventilation issues and allowing the bees to venture outside of the hive during warm winter days is extremely important, and can be difficult if the hive is tightly sealed.
On sunny days some bees will fly outside to defecate since they are fastidious when it comes to cleanliness within the hive. Unfortunately, just because the sun is out doesn’t mean they’ll make it back without falling to the ground, particularly when the temps are still barely above freezing. (This is evident in the photo – there are many dead bees in front of the hives where they flew out and chilled.)
It’s obviously not prudent to peek into the hives now, but if a warm Chinook wind blows through the area (oh please, please, please!), and it might be worthwhile to check them to see if we need to combine hives to help them pull through the rest of the season. Only time will tell.