East Merrimack, New Hampshire Weather
Fireflies rise from the lawn. Day 76 of spring. Read this microseason across nine climate regions →
East Merrimack weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Clear——85°50°—
- ThursdayJun 4Overcast——86°58°+1°
- FridayJun 5Overcast——84°60°-2°
- SaturdayJun 6Light Showers31%0.04″86°64°+2°
- SundayJun 7Light Showers74%0.17″67°52°-19°
- MondayJun 8Overcast30%—78°49°+11°
- TuesdayJun 9Overcast——83°53°+5°
Ozone at AQI 44 — peak already passed at 1 PM under clear 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 44 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 44
- UV peak
- 3.1 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 44
PM × Wind × Precip
PM2.5 at 6.4 µg/m³ (AQI 36) with a 0.88 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.88
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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).
The higher the clouds, the finer the weather.
- Moonrise
- 2:47 AM
- Moonset
- 11:30 AM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
East Merrimack at a glance
- Today vs. normal: 12°F above the seasonal normal for this latitude
- Last frost: May 3 (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 3, 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.
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
East Merrimack's warmest month is July (~73°F mean) and its coldest is January (~24°F). Rainfall peaks in October (4.7 inches) and bottoms out in January (3.0 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 24° | 3.0″ | 10 |
| February | 27° | 3.1″ | 10 |
| March | 35° | 4.1″ | 14 |
| April | 47° | 3.9″ | 13 |
| May | 58° | 3.6″ | 12 |
| June | 67° | 4.2″ | 14 |
| July | 73° | 3.6″ | 12 |
| August | 71° | 3.7″ | 12 |
| September | 64° | 4.2″ | 14 |
| October | 51° | 4.7″ | 16 |
| November | 40° | 3.7″ | 12 |
| December | 30° | 4.5″ | 15 |
Regional context
East Merrimack 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: Nashua, NH, Manchester, NH, Portsmouth, NH, Dover, NH, Concord, NH.
Frequently asked
- When does it freeze in East Merrimack?
- East Merrimack's last spring frost typically falls around mid-May, and the first fall frost arrives around mid-October.
- What is the rainy season in East Merrimack?
- October is the wettest month with about 4.7 inches of rain on average; the city receives roughly 46 inches annually.
- What is the warmest month in East Merrimack?
- July is typically warmest, averaging about 73°F.
- What is the coldest month in East Merrimack?
- January is typically coldest, averaging about 24°F.
- When can I start a vegetable garden in East Merrimack?
- 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 East Merrimack get?
- East Merrimack averages about 154 rainy days per year.
- What hardiness zone is East Merrimack?
- East Merrimack'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
East Merrimack, New Hampshire sits in a warm-summer humid continental climate zone. January means hover near 24°F while July averages 73°F — a 49°F seasonal swing.
Across the year, East Merrimack receives about 46 inches of precipitation spread over roughly 154 rainy days.
The rhythm of the year is set by latitude (42.9°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.