Here is an excerpt from the NU Webcam (now called FirstLight) on egg viability that may be relevant to our nest this year, keeping in mind that they are talking about a Massachusetts nest:
"During incubation, the adults must keep the eggs warm and dry as exposure to rain and snow can chill and kill the developing embryos. Late snowstorms have resulted in the failure of many Massachusetts eagle nesting attempts, most notably the April Fools blizzard of 1997 which dumped up to 20 inches of heavy wet snow across the western half of the state. That year, four pairs of eagles nesting along the Connecticut River, including the pair under Eagle Cam, all failed to produce chicks. The snow that built up on the nests melted and collapsed around the eggs and the adults were unable to keep the egg cup warm and dry."
Hopefully our eggs here have not been impacted in a similar way.