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Contents
- The climate of Lewiston
- The best time to visit Lewiston
- The worst time to visit Lewiston
- Spring weather in Lewiston
- Summer weather in Lewiston
- Autumn weather in Lewiston
- Winter weather in Lewiston
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Lewiston
Lewiston, a city situated in Maine, USA, experiences a climate classified as Dfb according to the Köppen climate system. This climate type is commonly known as a humid continental climate, with no dry season and warm summers. The annual climatic patterns reveal a significant variation across all parameters, including temperature, rainfall, and snowfall.
Throughout the year, temperatures sharply diverge, ranging between a cold 13.3°F (-10.4°C) in January to a warm 77.5°F (25.3°C) in July. This temperature fluctuation conveys the distinctive nature of a humid continental climate. Precipitation remains relatively uniform throughout the year, with the smallest amount of 0.67" (17mm) in September and a peak of 1.69" (43mm) in October. The month-wise precipitation often determines the number of rainfall days, which reaches a maximum of 12.7 days in July.
Snowfall significantly impacts the climate from December to March, with the maximum recorded snowfall of 4.72" (120mm) in February. Conversely, no snow is observed from May to October, displaying the complete transition of seasons. Interestingly, Lewiston exhibits high humidity levels, maintaining an average of approximately 80% annually.
Contrary to constant humidity levels, sunshine hours change drastically from 4.6 hours in February to 10.1 hours in August. High sunlight exposure indicates a lesser degree of cloud cover. This observation aligns with the annual wind patterns, predominantly moderate with an average speed of around 6mph (9.7km/h), maintaining air circulation.
Throughout the year, temperatures sharply diverge, ranging between a cold 13.3°F (-10.4°C) in January to a warm 77.5°F (25.3°C) in July. This temperature fluctuation conveys the distinctive nature of a humid continental climate. Precipitation remains relatively uniform throughout the year, with the smallest amount of 0.67" (17mm) in September and a peak of 1.69" (43mm) in October. The month-wise precipitation often determines the number of rainfall days, which reaches a maximum of 12.7 days in July.
Snowfall significantly impacts the climate from December to March, with the maximum recorded snowfall of 4.72" (120mm) in February. Conversely, no snow is observed from May to October, displaying the complete transition of seasons. Interestingly, Lewiston exhibits high humidity levels, maintaining an average of approximately 80% annually.
Contrary to constant humidity levels, sunshine hours change drastically from 4.6 hours in February to 10.1 hours in August. High sunlight exposure indicates a lesser degree of cloud cover. This observation aligns with the annual wind patterns, predominantly moderate with an average speed of around 6mph (9.7km/h), maintaining air circulation.
The best time to visit Lewiston
For optimal exploratory experiences, considering local climate patterns, June to September makes for a favorable period to visit Lewiston. During these months, the average temperature ranges from 63.1°F (17.3°C) to 76.8°F (24.9°C), offering comfortable weather conditions for outdoor activities. Maximum daylight hours, particularly in June and July, facilitate sightseeing opportunities. The rainfall is moderate during this period, ensuring a pleasant yet vibrant atmosphere.
The worst time to visit Lewiston
Given the substantial decrease in temperature and precipitation, January and February might pose challenging weather conditions for visitors in Lewiston. These months record the lowest temperatures, with an average of 13.3°F (-10.4°C) to 14.4°F (-9.8°C), and high snowfall of up to 4.72" (120mm). The short daylight hours of about 9 to 10 hours accompanied by low sunshine hours can limit outdoor excursions and reduce visibility.
Spring weather in Lewiston
Springtime in Lewiston, spanning March to May, shows an encouraging increase in temperature, rising from 37.4°F (3°C) to 63.1°F (17.3°C). Correspondingly, daylight hours increase, promoting a more enjoyable outdoor environment. While April experiences the highest rainfall with an average of 1.42" (36mm), snowfall almost disappears by the end of spring, setting the scene for a more humbling and less harsh atmosphere.
Summer weather in Lewiston
Between June and August, Lewiston experiences a warm summer period. Average temperatures tend to hover around the balmy 70°F (21.1°C) to 77.5°F (25.3°C) range. Notably, daylight hours reach their annual peak, extending up to 15.5 hours in June. Likewise, sunshine hours peak during this time, catalyzing warmer weather conditions. Despite occasional rainfall, summer time in Lewiston offers a welcoming and appealing climate for visitors.
Autumn weather in Lewiston
Autumn in Lewiston, marked from September to November, presents a mild climate with receding temperatures. They reduce from 70°F (21.1°C) in September to 43.9°F (6.6°C) by November. Rainfall levels fluctuate during this season, reaching a high of 1.69" (43mm) in October. Even as daylight hours decrease, sunshine hours remain suitable for sightseeing and exploration.
Winter weather in Lewiston
Winter months in Lewiston, from December to February, are characterized by the coldest temperatures, ranging from 13.3°F (-10.4°C) to 29.1°F (-1.6°C). These months also see a significant increase in snowfall, peaking at 4.72" (120mm) in February. Despite these frosty conditions, the relative humidity remains high, around 83%. While winter in Lewiston brings a remarkable change in weather conditions, it also unfolds the city's unique winter charm.
Weather in January
January displays a signature Maine winter in Lewiston. The city endures chilly conditions with the highest temperature at 27°F (-2.8°C) and the lowest at 13.3°F (-10.4°C), coupled with substantial levels of snowfall. The cold weather is accompanied by a moderate breeze, with wind speeds clocking in around 7.3mph (11.7km/h) on average. Weather in January »
Weather in February
Transitioning from January to February, Lewiston witnesses slightly increased temperature ranges, though there remains a noticeable chill in the air. February is the month that displays the highest snowfall, recording 4.72" (120mm). Weather in February »
Weather in March
As March arrives, the winter chill starts to recede in Lewiston, moving the city toward a warmer spring. However, this month stands out with 8.3 days of rainfall, the highest compared to preceding months. Though wind speed tends to increase, the air pressure remains relatively stable. Weather in March »
Weather in April
With April coming in, Lewiston experiences a noticeable shift towards spring. There is a considerable decrease in snowfall as temperatures gradually begin to rise. On average, the city records about 10.8 days of rainfall, slightly higher from its earlier count in March. Weather in April »
Weather in May
May marks the advent of somewhat stable and pleasurable weather in Lewiston. The city achieves an average maximum temperature of 63.1°F (17.3°C), which is notably warmer compared to previous months. Humidity and cloud coverage continue to dictate the city's weather conditions without drastic changes in levels. Weather in May »
Weather in June
Summer arrives in Lewiston with the onset of June. The increase in temperature becomes more pronounced, offering warm and pleasant days. The city experiences longer daylight hours, contributing to the overall high temperature. Nevertheless, the weather remains bearable with the wind speed averaging around 5.7mph (9.2km/h). Weather in June »
Weather in July
July is the peak of summer in Lewiston, characterized by higher temperatures reaching up to 77.5°F (25.3°C), the highest of the year. The extended daylight hours, as well as the increase in relative humidity, contribute to a warmer climate. Weather in July »
Weather in August
While August continues Lewiston's summer stretch, it brings along a slight dip in maximum temperature from the July peak. The weather remains warm and agreeable, making it an ideal month for outdoor activities. Cloud coverage increases slightly more than that of July, providing a balance between sun and shade. Weather in August »
Weather in September
September in Lewiston brings the initial signs of fall as summer starts to retreat. A distinct drop in temperature becomes apparent, moving the weather towards cooler days. Despite the reduction in sunlight and temperature, September stands out with the lowest monthly rainfall, recording just 0.67" (17mm). Weather in September »
Weather in October
October sets the full-fledged arrival of fall in Lewiston. Temperatures continue their downward trend with chilly evenings making a comeback. However, the city experiences the highest rainfall count, marking around 1.69" (43mm) on average. Weather in October »
Weather in November
November witnesses a drastic shift in weather conditions leading towards the harsh Maine winter. The city undergoes significant cooling with temperatures decreasing steadily. As cooler weather settles, the first instances of snowfall are observed with an average of 1.26" (32mm). Weather in November »
Weather in December
In December, Lewiston braces for a full swing winter. Temperature drops further, making December one of the coldest months of the year. While snowfall increases, recording up to 3.66" (93mm), the overall dryness in the air amplifies the winter chill. Weather in December »
Updated: Aug 29, 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
What is the coldest time of year?
Lewiston's coldest weather arrives in January, when temperatures average a high of 27°F (-2.8°C) and a low of 13.3°F (-10.4°C).
How many days does it rain?
In Lewiston, during the entire year, the rain falls for 103.5 days and collects up to 14.96" (380mm) of precipitation.
When does it snow?
January through May, October through December are months with snowfall.
How much does it snow?
Throughout the year, there are 36.8 snowfall days, and 18.31" (465mm) of snow is accumulated.
What are the months with the lowest UV index?
The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2.
What is the most humid month?
February is the most humid month, with an average relative humidity of 84%.
What is the snowiest month?
February is the month with the most snowfall. Snow falls for 8.1 days and accumulates 4.72" (120mm) of snow.
What is the month with the least sunshine?
With an average of 4.6h of sunshine, February has the least sunshine of the year.
When is Daylight Saving Time (DST) in Lewiston?
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.
When it does not snow?
In Lewiston, snow does not fall in June through September.
When are the longest days?
June has the longest days of the year in Lewiston, with an average of 15h and 24min of daylight.
What time of the year is the hottest?
July is the warmest month, with the temperature often reaching an average high of 77.5°F (25.3°C) and an average low of 57.7°F (14.3°C).
When is the highest UV index?
The month with the highest UV index is July, with an average maximum UV index of 6.
What month has the most sunshine?
The month with the most sunshine in Lewiston is August, with an average of 10.1h of sunshine.
What is the driest month?
The month with the least rainfall is September, when the rain falls for 7.4 days and typically collects 0.67" (17mm) of precipitation.
What is the wettest month in Lewiston?
October is the month with the most rainfall. Rain falls for 9.3 days and accumulates 1.69" (43mm) of precipitation.
What is the least humid month?
With an average relative humidity of 76%, November is the least humid month.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 8h and 54min of daylight.
Average temperature
Lewiston, ME
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (27°F).
The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is January (13.3°F).
Average pressure
Lewiston, ME
- Average pressure in January:
29.98"Hg - Average pressure in February:
29.97"Hg - Average pressure in March:
30.02"Hg - Average pressure in April:
29.95"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:
30.04"Hg - Average pressure in October:
30"Hg - Average pressure in November:
30.05"Hg - Average pressure in December:
30.02"Hg
The month with the highest atmospheric pressure is November (30.05"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Lewiston, ME
- Average wind speed in January:
7.3mph - Average wind speed in February:
7.3mph - Average wind speed in March:
7.5mph - Average wind speed in April:
7.2mph - Average wind speed in May:
6.3mph - Average wind speed in June:
5.7mph
- Average wind speed in July:
5.1mph - Average wind speed in August:
4.9mph - Average wind speed in September:
5.4mph - Average wind speed in October:
6.5mph - Average wind speed in November:
6.6mph - Average wind speed in December:
7mph
The windiest month (with the highest average wind speed) is March (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity
Lewiston, ME
The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is November (76%).
Average rainfall
Lewiston, ME
- Average rainfall in January:
1.06" - Average rainfall in February:
1.06" - Average rainfall in March:
1.02" - Average rainfall in April:
1.42" - Average rainfall in May:
1.3" - Average rainfall in June:
1.57"
- Average rainfall in July:
1.1" - Average rainfall in August:
1.34" - Average rainfall in September:
0.67" - Average rainfall in October:
1.69" - Average rainfall in November:
1.34" - Average rainfall in December:
1.38"
The wettest month (with the highest rainfall) is October (1.69").
The driest month (with the least rainfall) is September (0.67").
Average rainfall days
Lewiston, ME
- Average rainfall days in January:
4.5 days - Average rainfall days in February:
4 days - Average rainfall days in March:
8.3 days - Average rainfall days in April:
10.8 days - Average rainfall days in May:
11.3 days - Average rainfall days in June:
11.3 days
- Average rainfall days in July:
12.7 days - Average rainfall days in August:
11.1 days - Average rainfall days in September:
7.4 days - Average rainfall days in October:
9.3 days - Average rainfall days in November:
6.9 days - Average rainfall days in December:
5.9 days
The month with the highest number of rainy days is July (12.7 days).
The month with the least rainy days is February (4 days).
Average snowfall
Lewiston, ME
- Average snowfall in January:
4.13" - Average snowfall in February:
4.72" - Average snowfall in March:
2.44" - Average snowfall in April:
1.65" - Average snowfall in May:
0.28" - Average snowfall in June:
0"
The month with the highest snowfall is February (4.72").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Lewiston, ME
- Average snowfall days in January:
8.7 days - Average snowfall days in February:
8.1 days - Average snowfall days in March:
7 days - Average snowfall days in April:
2.7 days - Average snowfall days in May:
0.1 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:
0.3 days - Average snowfall days in November:
2.8 days - Average snowfall days in December:
7.1 days
The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Lewiston, ME
- Average daylight in January:
9h and 2min - Average daylight in February:
10h and 3min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 3min - Average daylight in May:
14h and 5min - Average daylight in June:
15h and 2min
- Average daylight in July:
15h and 1min - Average daylight in August:
14h and 0min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 4min - Average daylight in December:
8h and 5min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in January:
5h and 1min - Average sunshine in February:
4h and 4min - Average sunshine in March:
5h and 4min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 0min - Average sunshine in June:
8h and 4min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
10h and 1min - Average sunshine in September:
8h and 3min - Average sunshine in October:
6h and 1min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days
Lewiston, ME
- Average sunshine days in January:
20.8 days - Average sunshine days in February:
18 days - Average sunshine days in March:
17 days - Average sunshine days in April:
16.4 days - Average sunshine days in May:
17.1 days - Average sunshine days in June:
16.3 days
- Average sunshine days in July:
16.2 days - Average sunshine days in August:
17.5 days - Average sunshine days in September:
20 days - Average sunshine days in October:
19.6 days - Average sunshine days in November:
19.6 days - Average sunshine days in December:
19 days
The month with the most sunshine days is January (20.8 days).
The month with the least sunshine days is July (16.2 days).
Average UV index
Lewiston, ME
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover
Lewiston, ME
The month with the most cloud cover is March (Cloud cover 51).
The months with the least cloud cover are August and September (Cloud cover 36).
Average visibility
Lewiston, ME
The months with the highest visibility are January, November and December (6mi).
The months with the lowest visibility are February, March, April, May, June, July, August, September and October (5mi).
Lewiston, Maine, USA
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