Climateby Month

Lewiston, ME climate by month

NOAA 1991-2020 normals · 218 ft elevation

Summers in Lewiston are mild; winters are very cold and snowy. Highs peak at 79°F in July and fall to 29°F in January. Wet days are spread through the year, from about 10 to 14 a month. Normal snowfall is about 78 in a year. The most comfortable time to visit is May, June and September.

Warmest month
79°F
July normal high
Coldest month
8°F
January normal low
Wet days a year
140
49.7 in of precipitation
Snow a year
77.5 in
normal snowfall

How warm is Lewiston?

Normal highs range from 29°F in January to 79°F in July.

0°20°40°60°80° January: normal high 29°F (-2°C), low 8°F (-13°C) 29° 8° February: normal high 33°F (1°C), low 9°F (-13°C) March: normal high 41°F (5°C), low 19°F (-7°C) April: normal high 54°F (12°C), low 30°F (-1°C) May: normal high 65°F (18°C), low 40°F (4°C) June: normal high 74°F (23°C), low 50°F (10°C) July: normal high 79°F (26°C), low 56°F (13°C) 79° 56° August: normal high 78°F (26°C), low 54°F (12°C) September: normal high 70°F (21°C), low 47°F (8°C) October: normal high 58°F (14°C), low 36°F (2°C) November: normal high 46°F (8°C), low 27°F (-3°C) December: normal high 35°F (2°C), low 16°F (-9°C) JFMAMJJASOND

Bars run from the normal low to the normal high for each month.

How rainy is Lewiston?

June has the most wet days (about 14); the year brings about 50 in of precipitation.

January: 11 wet days February: 10 wet days March: 11 wet days April: 12 wet days May: 13 wet days June: 14 wet days 14 July: 12 wet days August: 11 wet days September: 10 wet days 10 October: 12 wet days November: 11 wet days December: 13 wet days JFMAMJJASOND

Wet day: at least 0.01 in of rain or melted snow, counted from daily records 1991-2020.

How much does it snow?

Normal snowfall is 77.5 in a year, most of it in January.

January: 20.8 in of snow 20.8 February: 19.4 in of snow March: 13.8 in of snow April: 3.7 in of snow May: 0.0 in of snow 0.0 June: 0.0 in of snow July: 0.0 in of snow August: 0.0 in of snow September: 0.0 in of snow October: 0.3 in of snow November: 3.3 in of snow December: 16.2 in of snow JFMAMJJASOND

How humid is Lewiston?

Muggy days peak in July, at about 6 days.

January: 0 muggy days 0 February: 0 muggy days March: 0 muggy days April: 0 muggy days May: 0 muggy days June: 2 muggy days July: 6 muggy days 6 August: 5 muggy days September: 1 muggy days October: 0 muggy days November: 0 muggy days December: 0 muggy days JFMAMJJASOND

Muggy day: daily mean dew point of 65°F or higher, from hourly observations 1991-2020 at Augusta State Airport, 26 mi NE of the city center (the nearest airport with complete hourly records).

How much daylight?

Daylight ranges from about 8.9 hours in December to 15.4 hours in June.

January: 9.3 hours of daylight February: 10.5 hours of daylight March: 11.9 hours of daylight April: 13.5 hours of daylight May: 14.8 hours of daylight June: 15.4 hours of daylight 15.4 July: 15.1 hours of daylight August: 14.0 hours of daylight September: 12.5 hours of daylight October: 11.0 hours of daylight November: 9.7 hours of daylight December: 8.9 hours of daylight 8.9 JFMAMJJASOND
See all numbers
Monthly climate normals and day counts for Lewiston, 1991-2020
MonthHighLowPrecip.Wet daysSnowMuggy daysDaylight
January 29°F8°F 3.6 in11 20.8 in 0 9.3 h
February 33°F9°F 3.4 in10 19.4 in 0 10.5 h
March 41°F19°F 4.1 in11 13.8 in 0 11.9 h
April 54°F30°F 4.5 in12 3.7 in 0 13.5 h
May 65°F40°F 3.6 in13 0.0 in 0 14.8 h
June 74°F50°F 4.6 in14 0.0 in 2 15.4 h
July 79°F56°F 3.8 in12 0.0 in 6 15.1 h
August 78°F54°F 3.6 in11 0.0 in 5 14.0 h
September 70°F47°F 4.2 in10 0.0 in 1 12.5 h
October 58°F36°F 5.4 in12 0.3 in 0 11.0 h
November 46°F27°F 4.5 in11 3.3 in 0 9.7 h
December 35°F16°F 4.5 in13 16.2 in 0 8.9 h

High and low: NOAA 1991-2020 normal daily high and low. Wet days: at least 0.01 in of rain or melted snow. Muggy days: daily mean dew point 65°F or higher.

Best months to visit Lewiston

By our comfort score, the best months are May, June and September.

Comfort score by month (0-100) and its parts, in days per month
MonthScoreComfortableNotable rainHot or cold
Jan 230727
Feb 280622
Mar 391714
Apr 54482
May 711480
Jun 731581
Jul 661072
Aug 671261
Sep 711760
Oct 53780
Nov 36178
Dec 240822

Score = 40 × share of comfortable days + 25 × share of days without notable rain + 20 × share of days neither hot (90°F+) nor cold (high 40°F or below) + 15 × daylight. How the score works.

Frost dates in Lewiston

The last spring frost typically comes around Apr 25, and the first fall frost around Oct 19, leaving 177 frost-free days in a typical year.

Frost and freeze dates for Lewiston
Typical date1 year in 10
Last spring frost (32°F)Apr 25after May 6
First fall frost (32°F)Oct 19before Oct 5
Last hard freeze (28°F)Apr 11after Apr 24
First hard freeze (28°F)Nov 1before Oct 17
Frost-free season177 daysunder 159 days

"Typical" is the date with a 50% chance of a later spring frost (or earlier fall frost). Planting after the "1 year in 10" spring date gives a 90% chance of no further frost. The Old Farmer's Almanac publishes 30% dates, which fall between our typical and 1-in-10 dates.

Station: Lewiston (USC00174566), NOAA 1991-2020 freeze probabilities. Frost dates for every city in Maine.

Hottest and coldest readings, 1991-2020

The highest reading was 97°F (July 18, 1999); the lowest was -27°F (January 16, 2009).

From the temperature station's daily records with NOAA quality flags removed. Not an all-time record.

Near Lewiston

Similar climates elsewhere

Where the numbers come from

  • Temperature, rain, snowfall and snow depth: Durham (USC00172048), 9.1 mi SE of the city center, 140 ft (78 ft lower than the city). NOAA normals and daily records, 1991-2020.
  • Frost dates: Lewiston (USC00174566), 0.1 mi WSW of the city center, 180 ft . NOAA normals and daily records, 1991-2020.
  • Humidity and wind by hour: Augusta State Airport (USW00014605), 26 mi NE of the city center, 350 ft (132 ft higher than the city). NOAA normals and daily records, 1991-2020.
  • Daily humidity and wind: Augusta State Airport (726185-14605), 26 mi NE of the city center, 349 ft (131 ft higher than the city). Hourly observations, 1991-2020.
  • Not available for this location: cloud cover (no station close enough or similar enough in elevation).

Distances from the city center (USGS). Methodology · Report an error