Frederickson, Washington Weather
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Frederickson weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——68°53°—
- FridayJun 5Light Rain47%0.08″57°48°-11°
- SaturdayJun 6Light Showers89%—54°45°-3°
- SundayJun 7Light Drizzle——65°42°+11°
- MondayJun 8Overcast57%—67°44°+2°
- TuesdayJun 9Overcast62%—76°46°+9°
- WednesdayJun 10Overcast34%—65°46°-11°
Ozone at AQI 36 — peak already passed at 1 PM under overcast skies. AQI flat over the last 6 hours (within ±4 points). Levels should ease through evening.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 36 — peak already passed at 1 PM under overcast skies. Levels should ease through evening.
- Present
- AQI 36
- UV peak
- 3.6 at earlier today
- Sky at peak
- overcast
- Projected peak
- AQI 36
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 7:07 AM
- Moonset
- 3:52 PM
- In sign
- ♒︎ Aquarius
Rufous Hummingbirds Arrive
Frederickson at a glance
- Today vs. normal: 67°F — typical for the season
- Last frost: May 29 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Frederickson
SPC has placed Frederickson in the General Thunderstorms category for severe thunderstorms tomorrow.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
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
Frederickson's warmest month is August (~65°F mean) and its coldest is December (~39°F). Rainfall peaks in November (7.1 inches) and bottoms out in August (0.9 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 40° | 6.1″ | 14 |
| February | 41° | 4.3″ | 10 |
| March | 44° | 4.8″ | 13 |
| April | 48° | 3.9″ | 11 |
| May | 54° | 3.0″ | 8 |
| June | 59° | 2.3″ | 6 |
| July | 64° | 0.9″ | 3 |
| August | 65° | 0.9″ | 2 |
| September | 59° | 1.8″ | 4 |
| October | 50° | 4.1″ | 9 |
| November | 43° | 7.1″ | 14 |
| December | 39° | 6.0″ | 14 |
Regional context
Frederickson's climate, per the NOAA NCEI 1991-2020 normals from the nearest reporting station, runs cold-winter and warm-summer. January means hover near 40°F while July climbs to 64°F — a 24°F seasonal swing typical of northern-tier latitudes. Annual precipitation totals about 45.1 inches spread across roughly 110 days with measurable rain or snow.
Precipitation peaks in the cool season: November averages 7.1 inches across 14.1 days with measurable rain, mostly from frontal systems and winter storms, while August bottoms out at 0.9 inches across just 2.2 rainy days during the drier warm-season stretch. The cool-season-wet pattern aligns Frederickson with places like Spanaway, WA, Summit View, WA and Elk Plain, WA — places where Pacific or frontal storm tracks deliver the year's moisture between November and March.
The frost-sensitive growing window opens around late-May, when overnight lows reliably clear freezing for cool-season crops like peas, lettuce, spinach, and radishes. Warm-season transplants — tomatoes, peppers, and basil — typically wait two weeks past that date to avoid late spring cold snaps. The window closes around early-October, when overnight lows resume dipping below freezing and frost-tender plants need protection or harvest. These dates represent 30-year central tendencies; actual year-to-year variation can shift either bookend by 7-14 days, and local microclimate features within Frederickson — cold-air drainage on calm clear nights, slope aspect, distance from any nearby lake or river — can push the practical frost window earlier or later than the regional average.
Similar climates: Spanaway, WA, Summit View, WA, Elk Plain, WA, Clover Creek, WA, South Hill, WA.
Frequently asked
- When does it freeze in Frederickson?
- Frederickson's last spring frost typically falls around mid-May, and the first fall frost arrives around mid-October.
- What is the rainy season in Frederickson?
- November is the wettest month with about 7.1 inches of rain on average; the city receives roughly 45 inches annually.
- What is the warmest month in Frederickson?
- August is typically warmest, averaging about 65°F.
- What is the coldest month in Frederickson?
- December is typically coldest, averaging about 39°F.
- When can I start a vegetable garden in Frederickson?
- 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 Frederickson get?
- Frederickson averages about 110 rainy days per year.
- What hardiness zone is Frederickson?
- Frederickson'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
Frederickson, Washington sits in a warm-summer Mediterranean climate zone. January means hover near 40°F while July averages 64°F — a 24°F seasonal swing.
Across the year, Frederickson receives about 45 inches of precipitation spread over roughly 110 rainy days.
The rhythm of the year is set by latitude (47.1°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.