Climate and monthly weather forecast
Nashua, NH

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The arched Main Street Bridge crossing over the iconic Nashua River in New Hampshire
The arched Main Street Bridge crossing over the iconic Nashua River in New Hampshire

The climate of Nashua

The thriving city of Nashua finds itself comfortably positioned in New Hampshire, USA, subjected to a Humid continental climate, known under Köppen classification as Dfb, characterized by no dry season and warm summers. This particular classification signifies a significant variation in temperatures and precipitation throughout the year.

Examining the prevailing data, it becomes evident that the climate in Nashua exhibits a broad range of temperatures, reaching their zenith in July with approximately 82°F (27.8°C), while plummeting to the low twenties in January. Reinforcing this trend of temperature divergence is the relative humidity, consistently residing in mid-70s to low 80s percentages throughout the year.

Manifesting its Humid continental demeanor, the city witnesses rainfall distributed evenly throughout the year. The most substantial showers grace the city between June and November, with the heaviest precipitation occurring in the month of November, registering approximately 0.79" (20mm). A unique attribute of Nashua's weather pattern emerges in the form of snowfall, frequenting the city between the months of January and March, as well as in November and December. The heaviest snowfall is typically observed in January and December, both months recording over an inch of snow.

The Best Time to Visit Nashua

Given the variety of climatic conditions Nashua experiences, the best time to visit largely depends on the individual visitor's preferences and the activities they wish to pursue. For those who enjoy milder temperatures and wish to engage in outdoor recreational activities, May through September offers the most favorable weather, with temperatures progressively increasing from a comfortable 55.2°F (12.9°C) to 82°F (27.8°C), and dropping to a manageable 67.3°F (19.6°C) in September. During these months, the city gets around 8.5 hours to 10.4 hours of sunshine daily, providing ample daylight for exploration.

The Worst Time to Visit Nashua

Travelers wary of cold temperatures might find the frigid winter months, particularly January and February, less inviting. These months not only register the lowest temperatures, dipping below 20°F (-6.7°C), but also exhibit increased snowfall, often exceeding an inch. Furthermore, the daylight hours get significantly reduced, stretching only from 9.1 hours to 10.6 hours.

Spring Weather in Nashua

Spring signals a period of transition for Nashua, experiencing a gradual climb in temperatures from 41.5°F (5.3°C) in March to a pleasing 67.3°F (19.6°C) by May. Accompanying the ascending temperatures is a minor increase in the precipitation level, culminating to approximately 0.63" (16mm) by May. This period also brings in prolonged daylight hours, increasing from 12 hours to 14.7 hours, allowing residents and visitors more time to enjoy the blooming landscape.

Summer Weather in Nashua

Summer in Nashua brings about warm temperatures, hitting their peak in July and August, with an average of approximately 82°F (27.8°C) and 80.2°F (26.8°C) respectively. Interestingly, these months also record slightly increased precipitation levels, peaking around 0.71" (18mm). However, the increased rainfall does not dampen the sunny disposition of summer, as the sunshine duration still averages from 15.3 hours to 13.9 hours daily.

Autumn Weather in Nashua

Signaling a cooldown from the summer heat, autumn months in Nashua begin with relatively high temperatures of 72.5°F (22.5°C) in September, which then gradually decline to a chilly 47.3°F (8.5°C) in November. Consistent with the falling temperatures is the drop in the daylight duration, decreasing from 12.5 hours to less than 10 hours daily. Meanwhile, precipitation levels see a small surge, reaching a high of 0.79" (20mm) by November.

Winter Weather in Nashua

Winter months in Nashua are accompanied by chilly temperatures, with the city experiencing its coldest month in January with temperatures as low as 18°F (-7.8°C). The city also witnesses increased snowfall during these months, with January and December experiencing in excess of an inch. Despite the cold and snowy conditions, Nashua offers a flurry of winter activities, making it a charming, if chilly, winter destination.

Weather in January

January in Nashua, New Hampshire brings chilly weather with average high temperatures reaching 30.9°F (-0.6°C), while the mercury drops as low as 18°F (-7.8°C) during the evening hours. As Nashua moves deeper into winter, it experiences increasing snowfalls, transforming the city into a winter wonderland. Weather in January »

Weather in February

The weather in February in Nashua presents a continuation of the freezing winter temperature with a slight increase in the average high to 33.8°F (1°C) and the low at 18.9°F (-7.3°C). The city remains ensnared in the clutch of winter, yet the amount of sunshine begins to incrementally increase compared to January, hinting at the distant arrival of spring. Weather in February »

Weather in March

March in Nashua marks the transitionary phase from Winter to Spring, with the daytime temperature reaching up to 41.5°F (5.3°C) and the nighttime temperature dropping to 27°F (-2.8°C). The city begins to thaw as the ice and snow retreat, gradually replaced by increasing frequency of rainfall. Weather in March »

Weather in April

The shift to spring weather becomes more apparent in April, as Nashua experiences a significant jump in the average high temperature to 55.2°F (12.9°C) and a low of 37.6°F (3.1°C). As snowfall nearly ceases and is replaced by rainfall, the city's environment becomes increasingly vibrant with blooming flowers. Weather in April »

Weather in May

The arrival of May in Nashua signifies the advent of true spring weather, characterized by an average high temperature of 67.3°F (19.6°C) and an agreeable low of 47.5°F (8.6°C). Torrents of rain dissipate, taking a back seat to pleasant, sun-filled days. Weather in May »

Weather in June

Summertime is pronounced in Nashua during June with average high temperatures reaching a comfortable 75°F (23.9°C), while nights are cooler at 54.7°F (12.6°C). This is the month when the city witnesses a slight uptick in humidity, signaling the arrival of a classic New England summer. Weather in June »

Weather in July

As the peak of summer, July in Nashua experiences the hottest average high temperature of the year at 82°F (27.8°C) and a nighttime temperature of 61.5°F (16.4°C). Extended hours of daylight, coupled with reduced cloud cover, make for the sunniest days of the year. Weather in July »

Weather in August

August in Nashua carries the summer season further with high temperatures nearly matching those in July at 80.2°F (26.8°C), while the low dips slightly to 60.1°F (15.6°C). A peculiar aspect of August is the increasing cloud cover, lending a unique charm to the otherwise bright summer skies. Weather in August »

Weather in September

The autumn equinox in September signals the commencement of fall in Nashua, reflected by a considerable drop in the daytime temperature to 72.5°F (22.5°C) and the temperature at night to 53.8°F (12.1°C). With falling leaves painting the city's trees in shades of red, orange, and yellow, the cityscape of Nashua is nothing short of a picturesque scene. Weather in September »

Weather in October

October brings a further decline in temperature in Nashua, with the high averaging 59.5°F (15.3°C) and the low at 44.4°F (6.9°C). A prominent characteristic of this month is the increasingly short days, indicating the nearing winter. Weather in October »

Weather in November

With November comes the undeniable transition to winter in Nashua, noticeable by the sharp drop in temperatures, with the high reaching only 47.3°F (8.5°C) and the low plunging to 34°F (1.1°C). Autumn leaves give way to barren tree branches as the city prepares for the onset of winter. Weather in November »

Weather in December

Finally, December signifies the full swing of winter weather in Nashua, with an average high temperature of 36.5°F (2.5°C) and a low of 25.7°F (-3.5°C). In addition to the dip in temperatures, the amount of snowfall also experiences a notable increase. Weather in December »
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Frequently asked questions

What part of the year is the coldest in Nashua?

Nashua's coldest weather arrives in January, when temperatures average a high of 30.9°F (-0.6°C) and a low of 18°F (-7.8°C).

How much does it rain in Nashua?

Throughout the year, there are 91.2 rainfall days, and 7.24" (184mm) of precipitation is accumulated.

When does it snow in Nashua?

Months with snowfall are January through May, October through December.

How much does it snow in Nashua?

Throughout the year, in Nashua, New Hampshire, there are 25 snowfall days, and 5.91" (150mm) of snow is accumulated.

What is the month with the lowest UV index in Nashua?

The months with the lowest UV index in Nashua, New Hampshire, are January, February, November and December, with an average maximum UV index of 2.

What is the most humid month in Nashua?

With an average relative humidity of 82%, February is the most humid month.

What is the snowiest month in Nashua?

The months with the most snowfall in Nashua, New Hampshire, are February and December, with an average 1.26" (32mm) of accumulated snow.

What is the month with the least sunshine in Nashua?

The month with the least sunshine is February, with an average of 4.6h of sunshine.

When is Daylight Saving Time (DST) in Nashua?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.

What is the least humid month in Nashua?

April is the least humid month in Nashua, with an average relative humidity of 71%.

When it does not snow in Nashua?

In Nashua, New Hampshire, snow does not fall in June through September.

When are the longest days in Nashua?

June has the longest days of the year, with an average of 15h and 18min of daylight.

What is the month with the highest UV index in Nashua?

June through August, with an average maximum UV index of 6, are months with the highest UV index in Nashua.

What are the warmest months in Nashua?

July, characterized by an average high temperature of 82°F (27.8°C) and a low temperature of 61.5°F (16.4°C), is generally the warmest month in Nashua, New Hampshire.

What month has the most sunshine in Nashua?

With an average of 10.4h of sunshine, August has the most sunshine of the year in Nashua, New Hampshire.

What is the driest month in Nashua?

September is the month with the least rainfall. Rain falls for 7 days and accumulates 0.28" (7mm) of precipitation.

What is the rainiest month in Nashua?

The month with the most rainfall in Nashua is November, when the rain falls for 5.7 days and typically aggregates up to 0.79" (20mm) of precipitation.

What is the month with the shortest days in Nashua?

The month with the shortest days is December, with an average of 9h and 6min of daylight.

Average pressure
Nashua, NH

Average pressure - Nashua, NH

The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed
Nashua, NH

Average wind speed - Nashua, NH

The windiest month (with the highest average wind speed) is January (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

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Average rainfall
Nashua, NH

Average rainfall - Nashua, NH

The wettest month (with the highest rainfall) is November (0.79").
The driest month (with the least rainfall) is September (0.28").

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Average rainfall days
Nashua, NH

Average rainfall days - Nashua, NH

The month with the highest number of rainy days is June (10.4 days).
The month with the least rainy days is January (3.5 days).

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Average snowfall
Nashua, NH

Average snowfall - Nashua, NH

The months with the highest snowfall are February and December (1.26").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Nashua, NH

Average snowfall days - Nashua, NH

The month with the highest number of snowfall days is February (6.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Nashua, NH

Average daylight / Average sunshine - Nashua, NH

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

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Average sunshine days
Nashua, NH

Average sunshine days - Nashua, NH

The month with the most sunshine days is January (22.6 days).
The month with the least sunshine days is July (17.3 days).

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Average UV index
Nashua, NH

Average UV index - Nashua, NH

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average visibility
Nashua, NH

Average visibility - Nashua, NH

The months with the highest visibility are January, March, April, November and December (6mi).
The months with the lowest visibility are February, May, June, July, August, September and October (5mi).

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Nashua, New Hampshire, USA

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