Wind direction is critical for a good or bad day in the saddle. Winds often flow up from the south and push west or east.
In Alberta - Chinook winds and Alberta weatherHaving the wind with you can mean an extra 10km. On the flip side, a strong headwind can mean a 10km day total. The common belief is that prevailing winds go West to East. But that is not true. Not on a bicycle. For example:
- Wind direction in the Rockies change day to day
- Chinook winds occur over the winter and die out around Calgary
- Prairies wind either blows up southwest or southeast (ref)
- The Great Lakes Region has wind going every which way (ref)
- Wind generally flows South-West down the St Lawrence River (ref)
- Maritime winds come up South-West (Boston's weather 2-3 days later)
Historical Canadian weather data, National Climate Data and Information Archive.
A online US wind map in real time that shows the crosswinds coming from across the border, Wind Map (very cool!).
Global wind patterns. Animated map showing the Westerlies moving north and east from the US to Canada, Global Wind.