With its variable weather, reptiles take the opportunity to sunbath and get up to operating temperature whenever they can in April. This month is when you can get a good look at snakes in the middle of the day, as they will be reluctant to move from their sunny patch. They won't be out in the open though -- more likely in a little spot of sunlight surrounded by long grass or hidden from view in some other way.
A sunbathing Western Whip Snake in our orchard -- you have to be quiet and lucky to get to see one.
The month will still feel cool, with average maximum temperatures not hitting 20° and average hours of sunlight still under 200, but the trend is upwards.