Calistoga / Napa Valley
United States · North America
Year-round range: 42°F to 92°F
May
Excellent conditions this month
Your monthly fit score
Comfort fit by month.
Climate details▼
Temperature
Average highs and lows.
May is warm and sunny — good for being outdoors.
Shaded band = typical daily swing (P10 of night lows to P90 of afternoon peaks) — spans wider than avg high/low lines because it captures day-to-day variation.
| = MayRainfall
Monthly rain and rain days.
May is one of the driest months — very little rain expected.
Sunshine
Average hours of bright sun per day.
May is one of the sunniest months — great for outdoor plans.
Clear sky
Clear-sky share is the inverse of average cloud cover (100% minus cloud cover). Band labels follow standard meteorological categories; distribution within each band varies by day.
Air comfort by month
Humidity and heat feel by month.
May stays comfortable — humidity stays low, though afternoons turn warm.
Time-of-day patterns
Typical hourly rhythm for May.
Temperature by hour
Temperature by hour and month
Typical temperature through the day across the year (1996-2025 normals, local time). Shaded cells are nighttime.
In May, afternoons reach about 76° and nights settle near 55°.
▶Full month-by-month data
| Month | High °F | Low °F | Rain days | Rain (in) | Sun h/day | Humidity |
|---|---|---|---|---|---|---|
| Jan | 60°F | 42°F | 14 | 4.7in | 4.7h | 74.85714285714285% |
| Feb | 62°F | 43°F | 14 | 4.8in | 5.5h | 71.71428571428571% |
| Mar | 65°F | 45°F | 12 | 3.9in | 6.5h | 69.14285714285714% |
| Apr | 71°F | 48°F | 6 | 1.7in | 8.6h | 61.42857142857142% |
| May | 79°F | 54°F | 3 | 0.8in | 10.7h | 53.57142857142857% |
| Jun | 87°F | 60°F | 1 | 0.2in | 13.6h | 46.28571428571428% |
| Jul | 92°F | 63°F | 0 | 0.0in | 13.9h | 45.71428571428571% |
| Aug | 92°F | 63°F | 0 | 0.0in | 13h | 47.285714285714285% |
| Sep | 88°F | 61°F | 0 | 0.2in | 11.8h | 48.71428571428571% |
| Oct | 79°F | 55°F | 4 | 1.4in | 9.2h | 52.14285714285714% |
| Nov | 66°F | 47°F | 9 | 2.9in | 6.2h | 66.57142857142857% |
| Dec | 59°F | 43°F | 10 | 6.4in | 4.8h | 76.57142857142857% |