Arguably the best time to visit Napa Valley is between November and mid-May.

The fall harvest gives visitors a special inside look at the wine-making process.

Summer is great for long, warm days and an incredibly stacked calendar of concerts and family-friendly festivals.

Yellow mustard flowers between grape vines in Napa Valley, California, USA

Getty Images

And winter is quietest, with deals in abundance.

The sun is shining, the flowers are blooming, and the vines are waking up after winter.

Daytime temperatures typically range from 67 to 76 degrees, and the winter rains die down.

Winter Vineyard with a Hot Air Balloon

Getty Images

Crush season, which lasts from mid-August through October, is also a lovely time to visit the valley.

That’s why the best rule of thumb for a Napa trip during any month is to pack layers.

For those in the know, it’s a favorite time to be in the valley.

Napa Valley wine country Vineyard in the early evening in sunny weather

Getty Images

The region is also rife with wildflowers from late March through June.

For the best experience, plan ahead.

Although some tasting rooms take walk-ins, most wineries only accept visitors by appointment.

greet-glass of Napa Valley Sauvignon Blanc) paired with a picnic basket of treats, including cheese and salami made with MartiniÕs Napa Valley Cabernet, duck rillette, truffle popcorn and a wild mushroom and truffle pizza, in Martini Park, at Louis M. Martini Winery

Jay L. Clendenin / Los Angeles Times via Getty Images

Having a reservation helps to make your experience more personalized and enriching.

The area accumulates roughly 27 inches of rain each year, most of which falls from December to March.

The region also experiences landslides when heavy rains cause the soil to become dangerously oversaturated.