Alliance, Nebraska climate: Normal weather by month, frost dates and records
Alliance's normal year runs from 9°F December nights to 89°F July afternoons, with 14.9 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.9°C, December lows of −13°C, July highs of 31°C, 378 mm of precipitation a year.
- NOAA stationAlliance Municipal Airport
- Station IDUSW00024044
- Location42.06°N 102.80°W
- Elevation3,924 ft (1,196 m)
- From the center5 miles
- Population8,071
On October 23, the normal high in Alliance is 59°F and the normal low 26°F, and the chance of measurable rain or snow is 18%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Alliance.
- Jan 38° 10°
- Feb 41° 12°
- Mar 51° 22°
- Apr 59° 28°
- May 69° 39°
- Jun 81° 49°
- Jul 89° 56°
- Aug 87° 54°
- Sep 77° 43°
- Oct 62° 29°
- Nov 49° 18°
- Dec 38° 9°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Alliance each month?
July is the warmest month, with normal highs of 89°F; December the coldest, with normal lows of 9°F. The most precipitation falls in June (2.90 in), the least in January (0.20 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 38°F | 10°F | 24.1°F | 0.20 | 3 | <1 | 31 | 9 h 30 min |
| February | 41°F | 12°F | 26.3°F | 0.28 | 4 | <1 | 28 | 10 h 30 min |
| March | 51°F | 22°F | 36.4°F | 0.60 | 5 | <1 | 28 | 11 h 50 min |
| April | 59°F | 28°F | 43.6°F | 1.72 | 8 | <1 | 20 | 13 h 20 min |
| May | 69°F | 39°F | 53.6°F | 2.65 | 12 | 1 | 7 | 14 h 30 min |
| June | 81°F | 49°F | 65.0°F | 2.90 | 11 | 7 | <1 | 15 h 10 min |
| July | 89°F | 56°F | 72.2°F | 2.40 | 9 | 17 | <1 | 15 h |
| August | 87°F | 54°F | 70.1°F | 1.49 | 8 | 14 | <1 | 14 h |
| September | 77°F | 43°F | 60.1°F | 1.26 | 7 | 5 | 3 | 12 h 30 min |
| October | 62°F | 29°F | 45.5°F | 0.91 | 6 | <1 | 19 | 11 h 10 min |
| November | 49°F | 18°F | 33.4°F | 0.24 | 3 | <1 | 29 | 9 h 50 min |
| December | 38°F | 9°F | 23.7°F | 0.23 | 3 | <1 | 31 | 9 h 10 min |
| Year (annual) | 62°F | 31°F | 46.2°F | 14.88 | 79 | 43 | 196 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 3°C | −12°C | −4.4°C | 5 mm |
| February | 5°C | −11°C | −3.2°C | 7 mm |
| March | 11°C | −6°C | 2.4°C | 15 mm |
| April | 15°C | −2°C | 6.4°C | 44 mm |
| May | 20°C | 4°C | 12.0°C | 67 mm |
| June | 27°C | 10°C | 18.3°C | 74 mm |
| July | 31°C | 13°C | 22.3°C | 61 mm |
| August | 30°C | 12°C | 21.2°C | 38 mm |
| September | 25°C | 6°C | 15.6°C | 32 mm |
| October | 17°C | −2°C | 7.5°C | 23 mm |
| November | 10°C | −8°C | 0.8°C | 6 mm |
| December | 4°C | −13°C | −4.6°C | 6 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Hemingford (23 miles away), gets 45 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00024044; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Alliance?
Normal highs sit between 65°F and 85°F in May, June and September. Of those, September has the fewest days with rain (7).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00024044.
When is the last frost in Alliance?
In Alliance, the last spring frost (32°F) comes after May 22 in half of years and after June 5 in one year in ten; the first autumn frost comes before September 22 in half of years and before September 7 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- May 221 year in 10 after June 5; 9 in 10 after May 10
- First autumn frost, half of years before
- September 221 year in 10 before September 7; 9 in 10 before October 4
NOAA puts the median frost-free season at 122 days, and the season without a hard freeze (28°F) at 140 days.
A hard freeze (28°F) comes after May 12 in half of springs and before October 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Alliance in zone 5a in ZIP code 69301, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Alliance's NOAA station is in zone 4b: the coldest night of a typical year reaches −23°F (22 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Nebraska · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00024044; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Alliance?
In a normal year in Alliance, 43 days a year reach 90°F (5 of them 100°F or more), 196 nights fall to 32°F or colder and 79 days bring measurable precipitation.
- Days at 90°F or more
- 43a normal year
- Days at 100°F or more
- 5a normal year
- Nights at 32°F or colder
- 196a normal year
- Days that stay below freezing
- 35high of 32°F or less
- Days with 0.01 inch of precipitation
- 79a normal year
The highest temperature in this station's record (since 1996) is 109°F, on July 16, 2006; the lowest is −36°F, on February 18, 2006.
The wettest calendar year on that record is 2015, with 22.32 in.
Source: NOAA NCEI 1991-2020 annual normals, station USW00024044; records: ACIS (NOAA Regional Climate Centers), station USW00024044. Records use complete months only; a month missing more than three days is left out.
How sunny is Alliance?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Alliance, 4.5 kWh per square metre a day. July is the sunniest month (88%) and April the cloudiest (72%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 76% | 2.1 |
| February | 74% | 3.0 |
| March | 74% | 4.2 |
| April | 72% | 5.3 |
| May | 75% | 6.2 |
| June | 84% | 7.2 |
| July | 88% | 7.2 |
| August | 86% | 6.2 |
| September | 84% | 5.0 |
| October | 78% | 3.4 |
| November | 78% | 2.4 |
| December | 75% | 1.9 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Alliance need?
A normal year in Alliance brings 7,395 heating degree days, 38% more than the median U.S. place (5,373), and 561 cooling degree days, 38% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,371 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,268 | 0 |
| February | 1,082 | 0 |
| March | 887 | 0 |
| April | 644 | 0 |
| May | 363 | 9 |
| June | 90 | 90 |
| July | 11 | 234 |
| August | 26 | 184 |
| September | 191 | 44 |
| October | 605 | 1 |
| November | 948 | 0 |
| December | 1,282 | 0 |
| Year (annual) | 7,395 | 561 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00024044. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Alliance been warmer than normal lately?
2025 averaged 48.4°F, 2.2°F above the 1991-2020 normal of 46.2°F. 2 of the 3 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 47.9°F | +1.7°F | 12.88 |
| 2022 | 46.2°F | at normal | 12.75 |
| 2025 | 48.4°F | +2.2°F | 13.89 |
Source: observed years: ACIS, station USW00024044. A year counts only with all twelve months complete.
How does Alliance's climate compare?
Alliance is warmer than 2 of the other 136 places with their own NOAA record in Nebraska, and wetter than 0. Across the 7,247 U.S. stations with normals, its annual mean of 46.2°F is warmer than 24%.
In the Köppen classification computed from these normals, Alliance is BSk: cold semi-arid steppe. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
What do Alliance's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Alliance. This page uses Alliance Municipal Airport; the other differs by site and elevation:
| Station | From the center | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Alliance (1 mi WNW) USC00250130 | 1 mi NW | 3,994 ft | 47.8°F | 14°F | 87°F | – | – | May 11 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Alliance's climate
What is the coldest month in Alliance?
December, with a normal high of 38°F and a normal low of 9°F. The warmest is July (89°F by day, 56°F at night).
Does it snow in Alliance?
Yes. NOAA publishes no 1991-2020 snowfall normal for Alliance's NOAA station; the nearest record that keeps one, Hemingford (23 miles away), records 45 inches of snow in a normal year.
What is the rainiest month in Alliance?
June, with 2.90 in of precipitation in a normal year; the driest is January with 0.20 in.
What plant hardiness zone is Alliance in?
The USDA's 2023 map puts Alliance in zone 5a in ZIP code 69301, the nearest ZIP area. By the same method at Alliance's NOAA station, the coldest night of a typical year reaches −23°F (22 years, 1991-2020): zone 4b.
How late can frost come in Alliance?
In half of years the last 32°F night comes after May 22; in one year in ten it comes after June 5. Waiting until June 5 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Nebraska climateThe statewide normals and every place in the state
- Hemingford, NE23 miles from this station, 48.1°F a year
- Ellsworth (2 mi W), NE25 miles from this station, 47.9°F a year
- Crescent Lake National Wildlife Refuge, NE28 miles from this station, 47.6°F a year
- Bridgeport, NE31 miles from this station, 50.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made