Climate Comfort Score
39/100
Below Average
NOAA 1991–2020 normals 27°F annual avg 2 stations
Delta, AK Climate
Pulled from NOAA NCEI 1991–2020 normals →: average temperature, precipitation, and comfort score
- 27°F
- Avg annual temp
- 39/100
- Comfort score
- 13.4"
- Annual precip
- 79d
- Growing season
30-year climate normals from 2 weather stations (1991-2020).
The climate verdict for Delta
Delta, Alaska averages 27°F a year and scores 39/100 on the comfort index - below average, milder than 4% of U.S. cities.
- 27°F
- average temperature, NOAA 1991-2020 normal
- 39/100
- comfort score, milder than 4% of U.S. cities
- 13.4"
- annual precipitation · 45" snow
- 79 days
- growing season, frost-free days
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
27°F (-3°C)
Avg High
39°F
Avg Low
16°F
Annual Precip
13.4"
Annual Snow
45.0"
Comfort Score
39/100
Below Average
Avg Annual Temperature
27°F
30-year mean (NOAA NCEI)
Annual Precipitation
13.4"
Plus 45.0" of snow
Comfort score vs national 100-point ceiling (Delta) 39.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Below Average for the Delta area.
How Delta compares to every U.S. city
Delta's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
39 Top 96% higher than 4% of 6,915 US cities
Each bar is a band; taller bars hold more US cities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Warming context for Delta
MethodologyZooming out from Delta's own normal, the chart below shows how the U.S. land temperature anomaly has tracked the global mean since 1900 - the most recent decade sits warmer than the 30-year mean shown here.
- 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 | 3°F (-16°C) | -13°F (-25°C) | -5°F (-21°C) | 0.5" | 6.1" | 30.9 | 0.0 |
| February | 14°F (-10°C) | -7°F (-22°C) | 3°F (-16°C) | 0.3" | 4.6" | 27.9 | 0.0 |
| March | 27°F (-3°C) | -1°F (-19°C) | 13°F (-11°C) | 0.3" | 4.0" | 31.0 | 0.0 |
| April | 47°F (8°C) | 19°F (-7°C) | 33°F (0°C) | 0.2" | 3.1" | 28.7 | 0.0 |
| May | 62°F (17°C) | 32°F (0°C) | 47°F (8°C) | 0.9" | 1.7" | 16.5 | 0.0 |
| June | 71°F (22°C) | 44°F (6°C) | 57°F (14°C) | 3.0" | 0.1" | 2.0 | 0.2 |
| July | 72°F (22°C) | 47°F (8°C) | 60°F (15°C) | 3.0" | 0.0" | 0.4 | 0.2 |
| August | 66°F (19°C) | 42°F (6°C) | 54°F (12°C) | 2.1" | 0.0" | 4.3 | 0.1 |
| September | 54°F (12°C) | 31°F (-1°C) | 42°F (6°C) | 1.1" | 2.3" | 18.7 | 0.0 |
| October | 33°F (0°C) | 15°F (-9°C) | 24°F (-4°C) | 0.7" | 7.3" | 28.7 | 0.0 |
| November | 12°F (-11°C) | -4°F (-20°C) | 4°F (-16°C) | 0.6" | 7.8" | 29.9 | 0.0 |
| December | 6°F (-14°C) | -10°F (-24°C) | -2°F (-19°C) | 0.6" | 8.0" | 31.0 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 0.5"
Snow: 6.1"
7.3 days with precipitation
February 0.3"
Snow: 4.6"
5.2 days with precipitation
March 0.3"
Snow: 4.0"
4.6 days with precipitation
April 0.2"
Snow: 3.1"
3.5 days with precipitation
May 0.9"
Snow: 1.7"
8.4 days with precipitation
June 3.0"
Snow: 0.1"
12.3 days with precipitation
July 3.0"
15.3 days with precipitation
August 2.1"
14.5 days with precipitation
September 1.1"
Snow: 2.3"
10.1 days with precipitation
October 0.7"
Snow: 7.3"
8.4 days with precipitation
November 0.6"
Snow: 7.8"
8.6 days with precipitation
December 0.6"
Snow: 8.0"
7.9 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
August 22
50% probability date
Last Spring Freeze
June 4
50% probability date
Growing Season
79 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
13,685
Higher = more heating needed
Cooling Degree Days
20
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Delta's climate means for you
Delta runs 27°F a year - peaking in July, coldest in January.
- Gardeners get about 79 frost-free days, with the last spring freeze near June 4 - plan the planting calendar around it, not the regional average.
- Energy bills track 13,685 heating and 20 cooling degree days a year, higher means the furnace or AC runs more.
- Comparing places to live? Line this city up against nearby cities and the national rankings. See rankings
These are 30-year NOAA normals (1991–2020) - the typical year, not a forecast for any specific season.
Climate Guides
Climate Insight: Delta, AK
In Delta, Alaska, the NOAA 1991–2020 climate normals put the annual average temperature at 27°F, ranging from a mean daily high of 39°F to a mean daily low of 16°F. July is typically the warmest month of the year, while January is the coldest. As thirty-year averages computed from 2 weather stations, these numbers smooth out year-to-year noise into a working baseline for a typical month.
Beyond temperature, Delta averages 13.4 inches of precipitation annually, with 45.0 inches typically falling as snow - a real factor for anyone planning to live, garden, or travel here. The frost-free season averages 79 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near June 4 and the first fall freeze near August 22. Turning to energy use, 13,685 heating degree days and 20 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Delta scores 39/100 (Below Average), 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 Delta, AK? ▼
The average annual temperature in Delta, Alaska is 27°F. The warmest month averages 72°F (22°C) and the coldest averages -13°F (-25°C).
How much rain does Delta get? ▼
Delta receives 13.4 inches of precipitation annually, including 45.0 inches of snow. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Delta? ▼
Delta has a climate comfort score of 39/100 (Below Average), milder than 4% of U.S. cities in the PlainClimate database.
When is the growing season in Delta? ▼
Delta has approximately 79 frost-free days per year, with the last spring freeze around June 4 and the first fall freeze around August 22.
How much energy does heating and cooling require in Delta? ▼
Delta has 13,685 heating degree days and 20 cooling degree days annually, a heating-dominated climate. See our <a href="/guides/reading-weather-data/" class="underline hover:text-brand-600">guide to reading weather data</a> for what these figures mean.
Where does this Delta climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from 2 weather stations near Delta.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00502350. 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
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. This page draws directly on NOAA 1991-2020 U.S. Climate Normals data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.