Weather in Jasper, Oregon
Shoots and Sprouts Rise in Ranks. Day 58 of spring. Read this microseason across nine climate regions →
- TodayMay 16Light Snow32%58°48°
- SundayMay 17Heavy Drizzle33%63°43°
- MondayMay 18Overcast—69°43°
- TuesdayMay 19Overcast—69°40°
- WednesdayMay 20Overcast—69°39°
- ThursdayMay 21Partly Cloudy—78°44°
- FridayMay 22Partly Cloudy—77°46°
- PM 2.5
- 4.5 μg/m³
- PM 10
- 7.3 μg/m³
- NO₂
- 0.4 μg/m³
- Ozone
- 78.0 μg/m³
- UV Index
- 1.6 Low
Flowers blooming in late autumn, a sure sign of a bad winter coming.
- Moonrise
- 12:07 PM
- Moonset
- 2:53 AM
- In sign
- ♉︎ Taurus
Shoots and Sprouts Rise in Ranks
Jasper at a glance
- Today vs. normal: 10°F below the seasonal normal for this latitude
- Last frost: May 10 (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
Jasper's warmest month is August (~68°F mean) and its coldest is December (~41°F). Rainfall peaks in December (7.2 inches) and bottoms out in July (0.3 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 41° | 6.0″ | 12 |
| February | 43° | 4.7″ | 10 |
| March | 47° | 4.6″ | 11 |
| April | 51° | 3.3″ | 9 |
| May | 56° | 2.5″ | 7 |
| June | 61° | 1.2″ | 4 |
| July | 68° | 0.3″ | 1 |
| August | 68° | 0.4″ | 1 |
| September | 63° | 1.4″ | 3 |
| October | 53° | 3.2″ | 7 |
| November | 46° | 6.0″ | 12 |
| December | 41° | 7.2″ | 13 |
Frequently asked
- When does it freeze in Jasper?
- Jasper's last spring frost typically falls around mid-May, and the first fall frost arrives around mid-October.
- What is the rainy season in Jasper?
- December is the wettest month with about 7.2 inches of rain on average; the city receives roughly 41 inches annually.
- What is the warmest month in Jasper?
- August is typically warmest, averaging about 68°F.
- What is the coldest month in Jasper?
- December is typically coldest, averaging about 41°F.
- When can I start a vegetable garden in Jasper?
- 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 Jasper get?
- Jasper averages about 90 rainy days per year.
- What hardiness zone is Jasper?
- Jasper'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
Jasper, Oregon sits in a warm-summer Mediterranean climate zone. January means hover near 41°F while July averages 68°F — a 26°F seasonal swing.
Across the year, Jasper receives about 41 inches of precipitation spread over roughly 90 rainy days.
The rhythm of the year is set by latitude (44.0°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.