Climate and monthly weather forecastAlton, NH
Climate and monthly weather forecast
The climate of Alton
Geographically situated in New Hampshire, USA, Alton experiences a range of climatic conditions classified as Humid continental, no dry season, warm summer (Dfb) under the Köppen climate classification system. This type of climate is characterized by significant variations in weather patterns and temperature.Throughout the year, Alton's temperature fluctuates from a low of 12.9°F (-10.6°C) in January to a high of 78.3°F (25.7°C) in July. Relative humidity also varies slightly but remains within the high range from 76% in April to 86% in January and February. High humidity is indicative of the town's prevalent moisture-laden air, influencing the general weather conditions.
Rainfall and snowfall exhibit intriguing patterns. Rainfall is most abundant in the shoulder months of April and October displaying 2.99" (76mm) and 3.19" (81mm), respectively. Snowfall hits its peak in February with snow accumulation reaching up to 9.84" (250mm). This snow is shared over an average of 12.4 days hinting at frequent snow showers during this period.
Daylight hours expand and shrink with the cycle of seasons, reaching their zenith at 15.4 hours in June and plunging to their nadir at 9 hours in December. Furthermore, wind speeds in Alton hover around 7.1mph (11.4km/h) in January and February and drop to about 4.7mph (7.6km/h) in July and August. On the other hand, pressure remains relatively stable throughout the year.
The best time to visit Alton
Considering the temperate conditions, pleasant sunshine, and meager rainfall, the prime time to pay a visit to Alton spans from June through September. During this period, temperatures are comfortably warm, fluctuating between 69.6°F (20.9°C) and 78.3°F (25.7°C). The warmer weather is accompanied by the longest sunlight durations, averaging between 13.9 hours to 15.4 hours, gracing the town with abundant sunshine.The worst time to visit Alton
On the flip side, the least appealing time to visit Alton is between January and February. During these months, temperatures plunge to freezing lows of 12.9°F (-10.6°C) to 14.4°F (-9.8°C) respectively. The snowy conditions coupled with the biting cold make this period less favorable for outdoor activity. It's also noteworthy to mention that these months experience the shortest daylight hours, peaking only at 9.4 hours and 10.5 hours respectively, which further limits outdoor exploration time.Spring weather in Alton
Spring in Alton comes with progressively warming temperatures and increased rainfall. From March to May, the temperatures rebound from lows of 22.5°F (-5.3°C) to highs of 63.9°F (17.7°C). Rainfall also peaks during these months with April witnessing the highest average rainfall of 2.99" (76mm), indicative of ample spring showers.Summer weather in Alton
Summer weather in Alton, which spans June through August, is characterized by warm temperatures, abundant sunshine, and relatively high humidity levels. Temperatures during this period range between 69.6°F (20.9°C) and 78.3°F (25.7°C), presenting warm and comfortable weather conditions.Autumn weather in Alton
Autumn in Alton experiences a gradual decrease in temperatures and a surge in rainfall. From September to November, temperatures drop from 69.6°F (20.9°C) to 43.3°F (6.3°C). Notably, October experiences the highest rainfall with an average of 3.19" (81mm), signifying the presence of substantial autumn showers.Winter weather in Alton
Winter in Alton boasts of a snowy wonderland with temperatures dipping below freezing and snowfall reaching its peak. December through February sees temperatures range between 12.9°F (-10.6°C) and 29.3°F (-1.5°C). Snowfall during these months fluctuates from 7.01" (178mm) in December to 9.84" (250mm) in February, producing a substantial amount of snow.Weather in January
January graces Alton, New Hampshire with a clear and crisp winter scenario. Snowfall typically reaches up to 7.36" (187mm) with an average high temperature of 26.1°F (-3.3°C), providing a real winter experience. With daylight at 9.4 hours per day, residents can expect a fair span of daylight despite the season. Weather in January »Weather in February
As deep winter takes hold in Alton, activity continues with a steady rhythm. With temperatures slightly higher than January, the extreme chill begins to ease. February holds its unique charm with a bit more snowfall, registering up to 9.84" (250mm). Weather in February »Weather in March
In Alton, when March arrives, the first hints of spring are in the air. Keeping with the transition from winter to spring, daytime temperatures begin to rise closer to the point of thawing. Compared to February, temperatures climb up, reaching a high average of 37.9°F (3.3°C), signaling the retreat of winter's icy grip. Weather in March »Weather in April
With the arrival of Spring, April in Alton offers a relief from the frosty winter months. The temperature rises notably from March’s averages, attesting to the enduring progress of Spring. This transformation bestows upon Alton a mindset of rebirth and growth, as reflected in the local flora. Weather in April »Weather in May
In May, the season of rejuvenation progresses, casting a warm glow over Alton. May’s weather builds upon April’s patterns, further increasing the temperature, but distinctively lowers the rainfall to 2.2" (56mm), marking the end of spring showers. Weather in May »Weather in June
June brings the onset of summer to Alton with warmer temperatures setting in. While this is a shift from the moderate climate of May, the weather remains pleasant for a majority of the daytime hours. Residents have ample daylight with 15.4 hours in a day, the highest for the year. Weather in June »Weather in July
July offers the quintessential summer experience in Alton. It gets warmer and peaks at an average high temperature of 78.3°F (25.7°C), making it the hottest month of the year. The increased heat is balanced by the serene beauty of Alton’s natural surroundings. Weather in July »Weather in August
The month of August in Alton introduces the fading moments of summer. As the temperatures subtly reduce from July's highs, the town experiences a gentle transition. August weather still retains the charm of outdoor convivialities with ample daylight and clear skies. Weather in August »Weather in September
With the arrival of September, Alton begins to embrace the fall season. The town witnesses a considerable drop in temperature from August and readies itself for colorful fall foliage. This change in weather results in milder average high temperatures of 69.6°F (20.9°C). Weather in September »Weather in October
October in Alton brings with it a distinct autumn chill. The temperature's further drop from September delineates its status as the gateway to winter. October’s rainy weather, with 3.19" (81mm) of rainfall, imparts a characteristic feature of the fall season. Weather in October »Weather in November
In November, Alton weather nudges noticeably towards winter, with temperatures dropping further from October. As the leaves fall and trees begin to bare, the town switches gears to winter mode. The second occurrence of snow begins, with up to 3.03" (77mm), despite the residual fall aura. Weather in November »Weather in December
December marks the return of winter with falling temperatures and increasing snowfall in Alton. A stark contrast from November's weather, December welcomes a high occurrence of snowfall up to 7.01" (178mm) and sees an average high temperature as low as 31.8°F (-0.1°C). Weather in December »Updated: Jun 22, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Alton experiences its average lowest temperatures in January, reaching a peak of 26.1°F (-3.3°C) and a minimum of 12.9°F (-10.6°C).
January and February, with an average relative humidity of 86%, are most humid months.
In Alton, New Hampshire, during the entire year, the rain falls for 152 days and collects up to 29.09" (739mm) of precipitation.
Months with snowfall are January through May, October through December.
In Alton, during the entire year, snow falls for 58.3 days and aggregates up to 38.98" (990mm) of snow.
The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2.
February is the month with the most snowfall. Snow falls for 12.4 days and accumulates 9.84" (250mm) of snow.
With an average of 4.5h of sunshine, February has the least sunshine of the year.
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.
April is the least humid month, with an average relative humidity of 76%.
In Alton, snow does not fall in June through September.
The month with the longest days is June, with an average of 15h and 24min of daylight.
June through August, with an average maximum UV index of 5, are months with the highest UV index.
July, having an average high-temperature of 78.3°F (25.7°C) and an average low-temperature of 57.6°F (14.2°C), is the warmest month.
With an average of 10.2h of sunshine, August has the most sunshine of the year.
The month with the least rainfall is September, when the rain falls for 10.8 days and typically collects 1.61" (41mm) of precipitation.
October is the month with the most rainfall. Rain falls for 14.4 days and accumulates 3.19" (81mm) of precipitation.
With an average of 9h and 0min of daylight, December has the shortest days of the year.
Average temperature
Alton, NH
The warmest month (with the highest average high temperature) is July (78.3°F).
The month with the lowest average high temperature is January (26.1°F).
The month with the highest average low temperature is July (57.6°F).
The coldest month (with the lowest average low temperature) is January (12.9°F).
Average pressure
Alton, NH
- Average pressure in January:
30"Hg - Average pressure in February:
29.98"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
29.99"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30"Hg - Average pressure in November:
30.06"Hg - Average pressure in December:
30.03"Hg
The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Alton, NH
- Average wind speed in January:
7.1mph - Average wind speed in February:
7.1mph - Average wind speed in March:
6.9mph - Average wind speed in April:
6.8mph - Average wind speed in May:
5.7mph - Average wind speed in June:
5.2mph
- Average wind speed in July:
4.7mph - Average wind speed in August:
4.7mph - Average wind speed in September:
4.8mph - Average wind speed in October:
5.8mph - Average wind speed in November:
6.1mph - Average wind speed in December:
6.6mph
The windiest months (with the highest average wind speed) are January and February (7.1mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).
Average humidity
Alton, NH
The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is April (76%).
Average rainfall
Alton, NH
- Average rainfall in January:
2.17" - Average rainfall in February:
2.13" - Average rainfall in March:
2.24" - Average rainfall in April:
2.99" - Average rainfall in May:
2.2" - Average rainfall in June:
2.64"
- Average rainfall in July:
2.09" - Average rainfall in August:
2.05" - Average rainfall in September:
1.61" - Average rainfall in October:
3.19" - Average rainfall in November:
2.87" - Average rainfall in December:
2.91"
The wettest month (with the highest rainfall) is October (3.19").
The driest month (with the least rainfall) is September (1.61").
Average rainfall days
Alton, NH
- Average rainfall days in January:
10 days - Average rainfall days in February:
8.3 days - Average rainfall days in March:
11.7 days - Average rainfall days in April:
15.8 days - Average rainfall days in May:
15.2 days - Average rainfall days in June:
15 days
- Average rainfall days in July:
15.4 days - Average rainfall days in August:
14.3 days - Average rainfall days in September:
10.8 days - Average rainfall days in October:
14.4 days - Average rainfall days in November:
10.7 days - Average rainfall days in December:
10.4 days
The month with the highest number of rainy days is April (15.8 days).
The month with the least rainy days is February (8.3 days).
Average snowfall
Alton, NH
- Average snowfall in January:
7.36" - Average snowfall in February:
9.84" - Average snowfall in March:
7.24" - Average snowfall in April:
3.7" - Average snowfall in May:
0.35" - Average snowfall in June:
0"
The month with the highest snowfall is February (9.84").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Alton, NH
- Average snowfall days in January:
13.2 days - Average snowfall days in February:
12.4 days - Average snowfall days in March:
11.6 days - Average snowfall days in April:
4.3 days - Average snowfall days in May:
0.3 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.4 days - Average snowfall days in November:
5.5 days - Average snowfall days in December:
10.6 days
The month with the highest number of snowfall days is January (13.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Alton, NH
- Average daylight in January:
9h and 24min - Average daylight in February:
10h and 30min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 30min - Average daylight in May:
14h and 42min - Average daylight in June:
15h and 24min
- Average daylight in July:
15h and 0min - Average daylight in August:
13h and 54min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 42min - Average daylight in December:
9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in January:
4h and 54min - Average sunshine in February:
4h and 30min - Average sunshine in March:
5h and 30min - Average sunshine in April:
7h and 36min - Average sunshine in May:
8h and 0min - Average sunshine in June:
8h and 42min
- Average sunshine in July:
9h and 48min - Average sunshine in August:
10h and 12min - Average sunshine in September:
8h and 12min - Average sunshine in October:
5h and 36min - Average sunshine in November:
5h and 24min - Average sunshine in December:
4h and 36min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days
Alton, NH
- Average sunshine days in January:
14.7 days - Average sunshine days in February:
12.6 days - Average sunshine days in March:
11.9 days - Average sunshine days in April:
11.4 days - Average sunshine days in May:
13.2 days - Average sunshine days in June:
13.2 days
- Average sunshine days in July:
13 days - Average sunshine days in August:
14.4 days - Average sunshine days in September:
16.9 days - Average sunshine days in October:
14.5 days - Average sunshine days in November:
16.3 days - Average sunshine days in December:
13.9 days
The month with the most sunshine days is September (16.9 days).
The month with the least sunshine days is April (11.4 days).
Average UV index
Alton, NH
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover
Alton, NH
The month with the most cloud cover is March (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility
Alton, NH
The months with the highest visibility are January, March, April, May, June, July, August, October, November and December (5mi).
The months with the lowest visibility are February and September (4mi).
