His approach was made more challenging by the heavy mid-winter rain that had deepened the swamp.
The breeding season is long, lasting from mid-winter to late summer.
Mid-winter rain-on-snow events can result in rapid snow melt, and in some years the peak flow from tributary watersheds occurs during these events.
Even so, during mid-winter, light incidence is highly directional and casts deep shadows.
However, infestation by adults can occur at any time of the year when conditions are suitable, even in mid-winter.
The mid-winter calendar position means the rally is frequently snow-bound with the surface a mix of ice and ashpalt.
Observations in mid-winter show that the caterpillars forage on the coldest of nights and are able to locomote, albeit very slowly, at sub-zero temperatures.
Numbers of this species in a given location are greatest in mid-winter and lowest in mid-summer.
