Weather in Chico, Washington
Shoots and Sprouts Rise in Ranks. Day 58 of spring. Read this microseason across nine climate regions →
- TodayMay 16Rain76%55°42°
- SundayMay 17Overcast—61°39°
- MondayMay 18Overcast—65°45°
- TuesdayMay 19Light Drizzle—65°45°
- WednesdayMay 20Overcast—68°42°
- ThursdayMay 21Mostly Clear—77°43°
- FridayMay 22Overcast—73°47°
- PM 2.5
- 2.1 μg/m³
- PM 10
- 2.5 μg/m³
- NO₂
- 2.9 μg/m³
- Ozone
- 76.0 μg/m³
- UV Index
- 1.6 Low
Flowers blooming in late autumn, a sure sign of a bad winter coming.
- Moonrise
- 11:52 AM
- Moonset
- 3:06 AM
- In sign
- ♉︎ Taurus
Shoots and Sprouts Rise in Ranks
Chico at a glance
- Today vs. normal: 14°F below the seasonal normal for this latitude
- Last frost: June 1 (climatological average for this latitude)
- Microseason: 28 of 72, May 16–20
- Planting window: Direct sow okra, melons, and southern peas. Thin carrot rows.
Right now in the garden
Cool-season window is open
As of May 16, the cool-season window is open or about to open. Direct-sow peas, lettuce, spinach, radishes, and brassicas now. Hold off on warm-season crops until 1–2 weeks after the last spring frost (around May).
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | — | — |
| May | lettuce, peas, spinach, radishes | lettuce, peas, radishes |
| June | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | tomatoes, peppers, beans, squash, fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | — | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
Chico's warmest month is August (~66°F mean) and its coldest is December (~40°F). Rainfall peaks in December (9.9 inches) and bottoms out in July (0.8 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 41° | 9.3″ | 14 |
| February | 42° | 5.8″ | 10 |
| March | 46° | 6.4″ | 12 |
| April | 50° | 3.9″ | 9 |
| May | 56° | 2.4″ | 6 |
| June | 61° | 1.6″ | 5 |
| July | 66° | 0.8″ | 2 |
| August | 66° | 1.1″ | 2 |
| September | 62° | 1.8″ | 5 |
| October | 53° | 5.1″ | 9 |
| November | 45° | 8.8″ | 13 |
| December | 40° | 9.9″ | 14 |
Regional context
Chico sits within a warm-summer Mediterranean climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Seattle, WA, Spokane, WA, Kennewick, WA, Bremerton, WA, Tacoma, WA.
Frequently asked
- When does it freeze in Chico?
- Chico's last spring frost typically falls around mid-May, and the first fall frost arrives around mid-October.
- What is the rainy season in Chico?
- December is the wettest month with about 9.9 inches of rain on average; the city receives roughly 57 inches annually.
- What is the warmest month in Chico?
- August is typically warmest, averaging about 66°F.
- What is the coldest month in Chico?
- December is typically coldest, averaging about 40°F.
- When can I start a vegetable garden in Chico?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-May); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Chico get?
- Chico averages about 102 rainy days per year.
- What hardiness zone is Chico?
- Chico's USDA hardiness zone is determined by its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Chico, Washington sits in a warm-summer Mediterranean climate zone. January means hover near 41°F while July averages 66°F — a 24°F seasonal swing.
Across the year, Chico receives about 57 inches of precipitation spread over roughly 102 rainy days.
The rhythm of the year is set by latitude (47.6°N), proximity to large water bodies, and elevation — all of which shape what grows here, when frost is likely, and what the weather story looks like day to day.