...for three or more days the daytime temperatures are above freezing and nights stay above 25F.
If it's dry, too, then it's perfect pruning weather.
Frozen ground will support your weight without damage to the soil. Not worried about that? You must not have any planted around trees as in the photo, unlike most of us!
48 hours of moderate temperature is enough for stub wood suddenly exposed to the air to harden against cell damage.
Maples, birches and beeches that tend to ooze sap when pruned may remain dry. Although this "bleeding" is not a problem for the tree it does upset gardeners and gunk up pruning tools.
A deciduous tree's structure is apparent when it's leafless. It's easy to decide what to cut.
While you're out, you can cut back any shrubs you planned to prune before budbreak.
*Thus shrub pruning during a thaw is problematic when the ground is covered in deep snow. We don't relish the extra work of clearing the snow around the shrub base, yet we want to cut shrubs to the ground. We do not want an ever-increasing clutter of stem bases to work with, but clean new stems from the ground level.
Because it is important to avoid wet tools and wet wood, we end up clearing snow as one operation, then putting on dry gloves and sometimes changing clothing, too.
...in these articles already posted on GardenAtoZ.org:
Thaw a Chance to Prune (Japanese maple)
We could remove more canes. We'll wait in this case until after the shrub blooms. Its crop of new canes are not yet blooming age so we keep a few of the older canes for the sake of more flowers.
Return to pruning hit list.
Shrubs are more resilient than most gardeners imagine.
Here is an account of a 45 year old honeysuckle that had not been pruned in many years. It had to be cut hard because it was blocking motorists' view of children approaching along the shoulder of the road.
It was not easy to cut out dozens of canes, some 2" in diameter and all crowded. We would rather have worked in winter and sweated less. But September was when the neighbors moved away who were half the reason this property line shrub had become a monster. With no new owner yet, we had no need to consult.