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Roy has a hot-summer Mediterranean climate.
Mild, rainy winters and hot, dry summers — here's what that means in plain terms.
What this climate feels like
The four things a regular visitor actually wants to know:
Highs near 91°F in July. About 48 days a year above 90 °F.
Lows near 22°F in January. About 103 freezing nights a year.
About 21 in of rain a year, plus 50 in of snow. Snow falls through the winter months.
A roughly even mix of sun and cloud.
What "hot-summer Mediterranean" means
Climate scientists sort every place on Earth into about 30 climate types, based on how hot, cold, wet and dry it is across the year. Roy's type — hot-summer mediterranean — sits in the broad family of mild, temperate climates.
Researchers write climate types as a short letter code. Here is what each letter means:
Cities with the same climate as Roy
A hot-summer Mediterranean climate (Csa) — these recognizable cities share it. If you know one of them, you know roughly what to expect.
Roy sits near a climate boundary
This city sits right on the line between hot-summer mediterranean and the next type along. Different climate maps file it on different sides of that line; the lived weather doesn't change at the line — it's a naming boundary, not a wall.
Has Roy's climate type changed?
A climate type is a coarse bucket. It can hold steady for years while the weather inside it shifts — or tip into the next bucket.
What this climate means for you
Wine grapes, olives, citrus, figs and rosemary thrive. Summer-active gardens need drip irrigation; cool-season crops do well over winter.
Spring and autumn are the perfect window — warm, dry and clear without summer's heat. Summer is hot but rain-free.
Sunny summers, mild winters and an outdoor lifestyle. Wildfires are the dominant summer risk in many areas.
Where these numbers come from
The climate type and the month-by-month figures on this page are computed from Roy's measured 30-year climate normals (1991–2020) — the same official records behind Roy's main climate page, so the two always agree.
Long-range climate maps measure things slightly differently and can place a city in a neighbouring category. Where they differ, this page uses the measured station record as the climate today.
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Farmington 3 NW (NOAA GHCN station USC00422726), about 18 km from the city centre.