Photo: Quintin Soloviev · CC BY 4.0Few U.S. towns have colder winter nights than Deltana
In July the day’s top temperature is typically 71°. Summers stay cool: July afternoons here are cooler than in almost every U.S. town. The year swings widely: the coldest month’s nights and the warmest month’s afternoons are 84° apart. Long walks are most pleasant from June to August, when afternoons reach 66–71°.
A year in Deltana at a glance
Each month’s typical high and low, and what it brings.
What stands out about Deltana’s climate
Compared with towns across the U.S., with Deltana’s place in Alaska beside it.
What a year in Deltana feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 75 frost-free days a year
In half of years the last 32° night comes by June 5 and the first by August 21. Frost dates and degree days from Delta Junction 20 Se, AK, 14 miles away.
The 2023 USDA map puts Deltana’s center in zone 3b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −34°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
About 42 inches of snow a winter
Snow, measured at Delta Junction 20 Se, AK, is heaviest from October through November, about 8 inches a month. Precipitation (rain plus melted snow) adds up to 12 inches a year; August is the wettest month and April the driest. Rain or snow falls on about 82 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Deltana
Nearly all of the work is heating: a normal year has almost no cooling days. Months averaging under 55° run from August through May.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Delta Junction 20 Se, AK.
Living with Deltana’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
75 frost-free days in zone 3b. The last frost comes by Jun 5 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Aug 21.
Months with highs of 62–84° and lows of 40° or more: June, July and August. 81 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Deltana from natural hazards, wildfire is the largest share (33%); heat waves, cold waves, winter storms and ice storms together are 20%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Deltana and its neighbors
Big Delta has the coldest January nights next door (-16°, 3° colder). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Deltana’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Deltana, AK | −13° | 71° | 12" | 42" |
| Thief River Falls, MN | −4° | 79° | 22" | 50" |
| Grand Forks, ND | −2° | 81° | 22" | 49" |
| Gunnison, CO | 0° | 82° | 12" | 50" |
| Superior, WI | 6° | 76° | 30" | 56" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
How Deltana compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Deltana’s place among Alaska’s.
Deltana weather by month
Highs, lows and precipitation from the nearest NOAA station; snow, wet days and snow on the ground from Delta Junction 20 Se, AK. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground |
|---|---|---|---|---|---|---|
| January | 5° | −13° | 0.4" | 6.3" | 4 | 29 |
| February | 15° | −8° | 0.3" | 5.1" | 4 | 25 |
| March | 26° | −4° | 0.3" | 4.4" | 3 | 26 |
| April | 46° | 17° | 0.3" | 2.4" | 3 | 13 |
| May | 61° | 32° | 0.9" | 0.5" | 7 | 0 |
| June | 70° | 43° | 2.2" | 0.0" | 11 | 0 |
| July | 71° | 46° | 2.2" | 0.0" | 14 | 0 |
| August | 66° | 40° | 2.3" | 0.0" | 13 | 0 |
| September | 55° | 30° | 1.2" | 1.0" | 9 | 0 |
| October | 34° | 15° | 0.8" | 8.0" | 6 | 9 |
| November | 14° | −2° | 0.6" | 7.7" | 6 | 24 |
| December | 8° | −9° | 0.5" | 6.8" | 5 | 26 |
| Year | 39° | 16° | 11.8" | 42.2" | 82 | 152 |
Where Deltana’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).
- Snow: Delta Junction 20 Se, AK.
- Frost dates, heating and cooling: Delta Junction 20 Se, AK, 14 miles away.
- 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 Deltana’s climate
What is the weather like in Deltana?
A typical July afternoon reaches 71°, a January night drops to −13°, and about 42 inches of snow falls in a normal winter. Colder January nights than all but 7 U.S. towns; cooler July afternoons than all but 103 U.S. towns.
How cold does it get in Deltana in winter?
January nights average −13°. About 253 nights a year reach 32° or below and 101 reach 0° or below.
How much snow does Deltana get?
About 42 inches in a normal winter at Delta Junction 20 Se, AK, heaviest from October through November, about 8 inches a month, with snow on the ground about 152 days a year.
How hot does it get in Deltana?
July, with a typical high of 71°. 90° days are rare: none in a normal year at Delta Junction 20 Se, AK.
When is the first and last frost in Deltana?
In half of years the last spring frost (32°) comes by June 5 and the first fall frost by August 21, about 75 frost-free days, at Delta Junction 20 Se, AK.
What growing zone is Deltana in?
Zone 3b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −34°.
What is the best time of year to visit Deltana?
By one simple rule (highs of 62–84° and lows of 40° or more), June, July and August. 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 Deltana.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.