Hardly any U.S. towns see fresher July days than Port Graham
Midwinter brings lows of about 21°. The wettest month is December; the driest is May. Garden planting can start around May 10; autumn frost returns near October 1.
A year in Port Graham at a glance
Each month’s typical high and low, and what it brings.
What stands out about Port Graham’s climate
Compared with towns across the U.S., with Port Graham’s place in Alaska beside it.
What a year in Port Graham feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 145 frost-free days a year
In half of years the last 32° night comes by May 10 and the first by October 1. Frost and day counts come from Seldovia Airport, 9 miles away.
The 2023 USDA map puts Port Graham’s center in zone 6b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −3°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
About 40 inches of rain a year
December is the wettest month and May the driest.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Port Graham
Nearly all of the work is heating: a normal year has almost no cooling days. Months averaging under 55°: every month but July.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Seldovia Airport.
Living with Port Graham’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
145 frost-free days in zone 6b. The last frost comes by May 10 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 1.
Of the yearly building losses FEMA expects in Port Graham from natural hazards, avalanches are the largest share (85%). Normals are averages; the hazards page covers the extremes.
Natural hazards →Port Graham and similar climates
TownRatings has no climate map of the towns around Port Graham yet.
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
How Port Graham compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Port Graham’s place among Alaska’s.
Port Graham weather by month
Highs, lows and precipitation from the nearest NOAA station. 1991–2020 normals.
| Month | High | Low | Rain + melt |
|---|---|---|---|
| January | 31° | 21° | 3.9" |
| February | 34° | 23° | 3.7" |
| March | 36° | 24° | 3.2" |
| April | 43° | 31° | 2.8" |
| May | 51° | 37° | 1.2" |
| June | 58° | 44° | 1.2" |
| July | 62° | 49° | 1.6" |
| August | 62° | 48° | 2.7" |
| September | 55° | 42° | 4.1" |
| October | 45° | 34° | 4.6" |
| November | 36° | 27° | 4.8" |
| December | 33° | 24° | 6.7" |
| Year | 45° | 34° | 40.4" |
Where Port Graham’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s 1991–2020 normals at the nearest station (NOAA’s grid doesn’t cover Alaska).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Seldovia Airport, 9 miles from the town’s center, 630 ft lower; no station nearby passes every check; this is the nearest one in the same valley, flagged above.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Port Graham’s climate
What is the weather like in Port Graham?
A typical July afternoon reaches 62°, a January night drops to 21°. Colder January nights than 55% of U.S. towns; cooler July afternoons than all but 7 U.S. towns.
How cold does it get in Port Graham in winter?
January nights average 21°. About 167 nights a year reach 32° or below and 1 reach 0° or below.
How hot does it get in Port Graham?
July, with a typical high of 62°. 90° days are rare: none in a normal year at Seldovia Airport.
When is the first and last frost in Port Graham?
In half of years the last spring frost (32°) comes by May 10 and the first fall frost by October 1, about 145 frost-free days, at Seldovia Airport.
What growing zone is Port Graham in?
Zone 6b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −3°.
What is the best time of year to visit Port Graham?
No month meets the simple rule we use (highs of 62–84° and lows of 40° or more). The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Neighbors talk weather
Gardens, snow, and the best days of the year in Port Graham.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.