HolyLand rainfall isn't something that just happens. Chazal, our sages tell us that G-d gives us the rain according to our deeds, our behavior according to mitzvah observance. The past few years have been cursed with drought. This year the rain began "on time," when we add the prayer for rain a couple of weeks after Succot.
We can see that it's a real winter by looking at the morning sky.
The past few years have been terribly dry with first heavy rains months later than we need. That's the reason for the tragic, deadly forest fire in the Carmel, northern Israel, last year.
If there had been sufficient rain, the forest wouldn't have had burnt so quickly and thoroughly.
When it's raining, we must call it a beautiful day, because we do need every drop of water G-d is willing to give us. The sun is always shining, even if it's hiding behind the clouds.
Let it rain!