Climate Comfort Score
57/100
Moderate
2026 data Public-data reference. official source
Portland Intl Jetport, ME Climate
Temperature, precipitation, and comfort score from NOAA NCEI 1991-2020 normals →
30-year climate normals from 1 weather station (1991-2020).
Portland Intl Jetport, Maine has an average annual temperature of 48°F and a climate comfort score of 57/100 (Moderate). Annual precipitation totals 48.1", including 68.7" of snow. Based on NOAA 30-year normals (1991–2020).
Avg Temperature
48°F (9°C)
Avg High
56°F
Avg Low
39°F
Annual Precip
48.1"
Annual Snow
68.7"
Comfort Score
57/100
Moderate
Avg Annual Temperature
48°F
30-year mean (NOAA NCEI)
Annual Precipitation
48.1"
Plus 68.7" of snow
Comfort score vs national 100-point ceiling (Portland Intl Jetport) 57.0%
National median (≈55)
PlainClimate composite — temperature mildness, humidity, precipitation, extreme-weather frequency. Moderate for the Portland Intl Jetport area.
Warming context for Portland Intl Jetport
MethodologyHow the U.S. land temperature anomaly tracks against the global mean since 1900. The current NOAA 1991-2020 normal for Portland Intl Jetport captures average conditions across the spread shown — the most recent decade is warmer than the 30-year mean.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 32°F (0°C) | 16°F (-9°C) | 24°F (-4°C) | 3.5" | 18.6" | 29.3 | 0.0 |
| February | 35°F (2°C) | 17°F (-8°C) | 26°F (-3°C) | 3.5" | 16.6" | 26.1 | 0.0 |
| March | 42°F (6°C) | 26°F (-3°C) | 34°F (1°C) | 4.1" | 13.6" | 24.5 | 0.0 |
| April | 54°F (12°C) | 35°F (2°C) | 45°F (7°C) | 4.4" | 2.8" | 11.9 | 0.0 |
| May | 64°F (18°C) | 46°F (8°C) | 55°F (13°C) | 3.7" | 0.0" | 0.7 | 0.4 |
| June | 74°F (23°C) | 55°F (13°C) | 64°F (18°C) | 4.2" | 0.0" | 0.0 | 1.0 |
| July | 80°F (26°C) | 61°F (16°C) | 70°F (21°C) | 3.4" | 0.0" | 0.0 | 1.9 |
| August | 79°F (26°C) | 60°F (15°C) | 69°F (21°C) | 3.6" | 0.0" | 0.0 | 1.3 |
| September | 71°F (22°C) | 52°F (11°C) | 62°F (16°C) | 3.8" | 0.0" | 0.1 | 0.5 |
| October | 60°F (15°C) | 41°F (5°C) | 50°F (10°C) | 5.3" | 0.2" | 6.3 | 0.0 |
| November | 48°F (9°C) | 32°F (0°C) | 40°F (4°C) | 4.3" | 2.3" | 18.3 | 0.0 |
| December | 38°F (3°C) | 22°F (-5°C) | 30°F (-1°C) | 4.5" | 14.6" | 26.7 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 3.5"
Snow: 18.6"
11.2 days with precipitation
February 3.5"
Snow: 16.6"
10.2 days with precipitation
March 4.1"
Snow: 13.6"
11.3 days with precipitation
April 4.4"
Snow: 2.8"
11.1 days with precipitation
May 3.7"
12.5 days with precipitation
June 4.2"
11.7 days with precipitation
July 3.4"
10.8 days with precipitation
August 3.6"
9.4 days with precipitation
September 3.8"
9.3 days with precipitation
October 5.3"
Snow: 0.2"
10.9 days with precipitation
November 4.3"
Snow: 2.3"
10.7 days with precipitation
December 4.5"
Snow: 14.6"
12.3 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
October 15
50% probability date
Last Spring Freeze
April 26
50% probability date
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,795
Higher = more heating needed
Cooling Degree Days
447
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Humidity & Wind
Monthly averages from hourly observations
| Month | Humidity | Wind (mph) | Clear Sky % | Overcast % |
|---|---|---|---|---|
| January | 62% | 8.0 | -373% | -386% |
| February | 62% | 9.1 | 40% | 38% |
| March | 62% | 9.2 | 39% | 39% |
| April | 64% | 8.5 | -5398% | -5399% |
| May | 72% | 7.5 | -5819% | -5817% |
| June | 72% | 6.9 | -1213% | -1229% |
| July | 74% | 6.3 | -1630% | -1648% |
| August | 73% | 6.5 | -369% | -399% |
| September | 75% | 6.8 | 46% | 29% |
| October | 71% | 7.8 | -1632% | -1636% |
| November | 70% | 7.8 | -796% | -798% |
| December | 67% | 7.8 | 43% | 35% |
Related Data
PlainEnviro
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PlainAirData
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Climate Guides
Climate Insight: Portland Intl Jetport, ME
The NOAA 1991–2020 climate normals describe Portland Intl Jetport, Maine as a location with an annual average temperature of 48°F, ranging from a mean daily high of 56°F to a mean daily low of 39°F. July is typically the warmest month of the year, while January is the coldest. These thirty-year averages, computed from station USW00014764, smooth out year-to-year variability and give a baseline expectation for typical conditions in any given month.
Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Portland Intl Jetport receives roughly 48.1 inches of precipitation each year, with 68.7 inches typically falling as snow. Growing-season length varies with elevation and microclimate, with the last spring freeze near April 26 and the first fall freeze near October 15. For energy use, 6,795 heating degree days and 447 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Portland Intl Jetport scores 57/100 (Moderate), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Use the monthly tables above to plan around specific windows — shoulder seasons for mild highs and lows, peak summer for July-driven heat, or deep winter for January-driven cold. All figures here are thirty-year averages: any single year may run warmer, wetter, drier, or cooler than the normal, so treat them as planning guidance rather than forecasts.
Frequently Asked Questions
What is the average temperature in Portland Intl Jetport, ME? ▼
The average annual temperature in Portland Intl Jetport, Maine is 48°F. The warmest month averages 80°F (26°C) and the coldest averages 16°F (-9°C).
How much rain does Portland Intl Jetport get? ▼
Portland Intl Jetport receives 48.1 inches of precipitation annually, including 68.7 inches of snow. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Portland Intl Jetport? ▼
Portland Intl Jetport has a climate comfort score of 57/100 (Moderate). This score considers temperature mildness, humidity, precipitation, and extreme weather frequency.
When is the growing season in Portland Intl Jetport? ▼
Growing season data is not available for Portland Intl Jetport.
How much energy does heating and cooling require in Portland Intl Jetport? ▼
Portland Intl Jetport has 6,795 heating degree days and 447 cooling degree days annually. Higher heating degree days indicate greater winter energy demand, while higher cooling degree days indicate greater summer cooling needs.
Where does this Portland Intl Jetport climate data come from? ▼
All climate data comes from NOAA U.S. Climate Normals v1.0.1, covering the 30-year period from 1991 to 2020. Data is collected from weather station USW00014764. These 30-year averages are the standard reference for typical weather conditions.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USW00014764. For informational purposes only.
Read our methodology — how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
