Weather in Wheaton, Maryland
Roses open along the stoops. Day 59 of spring. Read this microseason across nine climate regions →
- TodayMay 16Overcast23%84°50°
- SundayMay 17Overcast23%87°63°
- MondayMay 18Light Showers—97°65°
- TuesdayMay 19Overcast—94°64°
- WednesdayMay 20Light Showers64%92°65°
- ThursdayMay 21Light Drizzle48%61°55°
- FridayMay 22Drizzle48%57°49°
- PM 2.5
- 9.7 μg/m³
- PM 10
- 10.0 μg/m³
- NO₂
- 9.8 μg/m³
- Ozone
- 84.0 μg/m³
- UV Index
- 0.0 Low
When the dew is on the grass, rain will never come to pass.
- Moonrise
- 9:59 AM
- Moonset
- 12:41 AM
- In sign
- ♊︎ Gemini
Roses open along the stoops
Wheaton at a glance
- Today vs. normal: 3°F below the seasonal normal for this latitude
- Last frost: April 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
Warm-season window is open
As of May 17, the last spring frost has passed for most years. Transplant tomatoes, peppers, eggplants, basil, and cucurbits (cucumbers, squash, melons) now. Direct-sow beans and corn into warm soil.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
Wheaton's warmest month is July (~80°F mean) and its coldest is January (~36°F). Rainfall peaks in July (4.6 inches) and bottoms out in February (2.8 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 36° | 3.0″ | 6 |
| February | 39° | 2.8″ | 5 |
| March | 46° | 4.0″ | 7 |
| April | 57° | 3.4″ | 7 |
| May | 67° | 4.3″ | 8 |
| June | 76° | 4.6″ | 8 |
| July | 80° | 4.6″ | 7 |
| August | 79° | 3.7″ | 7 |
| September | 72° | 4.1″ | 6 |
| October | 59° | 4.2″ | 5 |
| November | 49° | 3.2″ | 5 |
| December | 41° | 3.7″ | 7 |
Regional context
Wheaton sits within a warm-summer humid continental climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Baltimore, MD, Hagerstown, MD, Frederick, MD, Waldorf, MD, Columbia, MD.
Frequently asked
- When does it freeze in Wheaton?
- Wheaton's last spring frost typically falls around mid-April, and the first fall frost arrives around mid-November.
- What is the rainy season in Wheaton?
- July is the wettest month with about 4.6 inches of rain on average; the city receives roughly 46 inches annually.
- What is the warmest month in Wheaton?
- July is typically warmest, averaging about 80°F.
- What is the coldest month in Wheaton?
- January is typically coldest, averaging about 36°F.
- When can I start a vegetable garden in Wheaton?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-April); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Wheaton get?
- Wheaton averages about 79 rainy days per year.
- What hardiness zone is Wheaton?
- Wheaton'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
Wheaton, Maryland sits in a warm-summer humid continental climate zone. January means hover near 36°F while July averages 80°F — a 44°F seasonal swing.
Across the year, Wheaton receives about 46 inches of precipitation spread over roughly 79 rainy days.
The rhythm of the year is set by latitude (39.0°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.