The weather you drive through does have an impact on moving bees. In the last three years, we've had three Las Niñas back to back, and now we're into an El Niño summer. Is that climate change? Is this just a natural progression? Is this a natural cyclical event that happens? It's not unlike things we experienced back in the early 1980s.
I've been beekeeping for over 40 years. We've never had two years that were exactly the same, as far as weather is concerned. However, the weather does affect how you're going to move your bees, when you're going to move your bees and when you're going to transport.
If I have a choice, I'll watch the weather before I look at moving. I watch for the cool, rainy days, or if it's going to be drizzling and whatnot. Hot, dry weather makes it a lot harder to move bees, and you just think that maybe we need to delay this a little bit.