Biking in the early spring is a messy business. Most of the roads are now free from ice and snow, but the bike-paths are all covered in remains of sand and gravel from the winter with the occasional patch of ice, snow, or a wet slurry. Even with reasonable fenders on the bike your back and legs are pretty much covered in mud after an hour.
Come spring/summer the plan is to put in some longer training rides to complement the running training. Maybe even some brevets on the new road-bike.
The temperature measurement circuit or transducer on the edge 800 seems to have a long-ish time-constant of about 15 minutes: