Only getting out to drive on beautiful, sunny days will only work against you if your test lands on a rainy, overcast day. The only true way to do this is get in those hours of practice driving, and trying to do so in a variety of weather conditions. Whether it's weather conditions, an ambulance coming down the road or any other situation that could happen, you should be mentally prepared to adapt and adjust accordingly. There are things you'll learn while driving that you just can't get from reading, so it's important to log plenty of time at the wheel. Like anything else, learning how to be a good driver takes lots of time behind the wheel practicing. The way each car's brake and gas pedals react can be different, so knowing how sensitive these are can help you avoid braking or accelerating too aggressively or too slowly. You'll want to know where the controls are for everything from the lights to the windshield wipers, so you aren't frantically searching if it starts raining.
The car you're using for your test should be familiar to you, and not one that you're sitting in for the first time.
