Arnold, Nebraska climate: Normal weather by month, frost dates and records
Arnold's normal year runs from 13°F January nights to 85°F July afternoons, with 23.5 inches of precipitation and 31 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.8°C, January lows of −11°C, July highs of 29°C, 597 mm of precipitation a year.
- NOAA stationArnold (4 mi WNW)
- Station IDUSC00250355
- Location41.43°N 100.27°W
- Elevation2,877 ft (877 m)
- Population591
On October 8, the normal high in Arnold is 66°F and the normal low 39°F, and the chance of measurable rain or snow is 17%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Arnold.
- Jan 36° 13°
- Feb 38° 16°
- Mar 50° 24°
- Apr 59° 34°
- May 68° 46°
- Jun 79° 57°
- Jul 85° 62°
- Aug 82° 59°
- Sep 76° 49°
- Oct 62° 35°
- Nov 48° 23°
- Dec 37° 15°
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 Arnold each month?
July is the warmest month, with normal highs of 85°F; January the coldest, with normal lows of 13°F. The most precipitation falls in June (4.06 in), the least in January (0.35 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 36°F | 13°F | 24.1°F | 0.35 | 5.4 | 3 | <1 | 31 | 9 h 30 min |
| February | 38°F | 16°F | 26.9°F | 0.62 | 7.2 | 4 | <1 | 27 | 10 h 40 min |
| March | 50°F | 24°F | 37.1°F | 1.17 | 4.2 | 5 | <1 | 26 | 11 h 50 min |
| April | 59°F | 34°F | 46.2°F | 2.47 | 2.7 | 7 | <1 | 14 | 13 h 20 min |
| May | 68°F | 46°F | 56.8°F | 3.73 | 0.4 | 9 | 1 | 3 | 14 h 30 min |
| June | 79°F | 57°F | 67.9°F | 4.06 | 0.0 | 9 | 5 | <1 | 15 h 10 min |
| July | 85°F | 62°F | 73.4°F | 3.47 | 0.0 | 8 | 11 | <1 | 14 h 50 min |
| August | 82°F | 59°F | 70.6°F | 2.60 | 0.0 | 6 | 8 | <1 | 13 h 50 min |
| September | 76°F | 49°F | 62.1°F | 1.83 | 0.0 | 5 | 4 | 1 | 12 h 30 min |
| October | 62°F | 35°F | 48.5°F | 1.88 | 1.2 | 5 | <1 | 13 | 11 h 10 min |
| November | 48°F | 23°F | 35.4°F | 0.72 | 3.6 | 3 | <1 | 27 | 9 h 50 min |
| December | 37°F | 15°F | 25.7°F | 0.62 | 6.1 | 3 | <1 | 31 | 9 h 10 min |
| Year (annual) | 60°F | 36°F | 47.9°F | 23.52 | 30.8 | 66 | 29 | 171 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 2°C | −11°C | −4.4°C | 9 mm | 14 cm |
| February | 3°C | −9°C | −2.8°C | 16 mm | 18 cm |
| March | 10°C | −4°C | 2.8°C | 30 mm | 11 cm |
| April | 15°C | 1°C | 7.9°C | 63 mm | 7 cm |
| May | 20°C | 8°C | 13.8°C | 95 mm | 1 cm |
| June | 26°C | 14°C | 19.9°C | 103 mm | 0 cm |
| July | 29°C | 17°C | 23.0°C | 88 mm | 0 cm |
| August | 28°C | 15°C | 21.4°C | 66 mm | 0 cm |
| September | 24°C | 9°C | 16.7°C | 46 mm | 0 cm |
| October | 16°C | 2°C | 9.2°C | 48 mm | 3 cm |
| November | 9°C | −5°C | 1.9°C | 18 mm | 9 cm |
| December | 3°C | −10°C | −3.5°C | 16 mm | 15 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00250355; 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 Arnold?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, September has the fewest days with rain (5).
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 USC00250355.
When is the last frost in Arnold?
In Arnold, the last spring frost (32°F) comes after May 5 in half of years and after May 19 in one year in ten; the first autumn frost comes before October 3 in half of years and before September 21 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 51 year in 10 after May 19; 9 in 10 after April 23
- First autumn frost, half of years before
- October 31 year in 10 before September 21; 9 in 10 before October 15
NOAA puts the median frost-free season at 149 days, and the season without a hard freeze (28°F) at 169 days.
A hard freeze (28°F) comes after April 26 in half of springs and before October 13 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Arnold in zone 5a in ZIP code 69120, the nearest ZIP area.
Frost dates for every NOAA station in Nebraska · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00250355; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Arnold?
In a normal year in Arnold, 29 days a year reach 90°F (2 of them 100°F or more), 171 nights fall to 32°F or colder and 66 days bring measurable precipitation.
- Days at 90°F or more
- 29a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 171a normal year
- Days that stay below freezing
- 37high of 32°F or less
- Days with 0.01 inch of precipitation
- 66a normal year
- Days with 1 inch of snow or more
- 10a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00250355.
How sunny is Arnold?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Arnold, 4.5 kWh per square metre a day. July is the sunniest month (87%) and April the cloudiest (74%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 77% | 2.3 |
| February | 76% | 3.2 |
| March | 74% | 4.2 |
| April | 74% | 5.3 |
| May | 75% | 6.2 |
| June | 83% | 7.0 |
| July | 87% | 7.0 |
| August | 85% | 6.0 |
| September | 83% | 4.9 |
| October | 79% | 3.5 |
| November | 79% | 2.5 |
| December | 76% | 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 Arnold need?
A normal year in Arnold brings 6,881 heating degree days, 28% more than the median U.S. place (5,373), and 686 cooling degree days, 24% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,714 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,268 | 0 |
| February | 1,065 | 0 |
| March | 867 | 0 |
| April | 563 | 1 |
| May | 279 | 26 |
| June | 47 | 134 |
| July | 5 | 267 |
| August | 20 | 193 |
| September | 147 | 60 |
| October | 516 | 4 |
| November | 888 | 0 |
| December | 1,217 | 0 |
| Year (annual) | 6,881 | 686 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00250355. 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 Arnold been warmer than normal lately?
2024 averaged 53.1°F, 5.2°F above the 1991-2020 normal of 47.9°F.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2024 | 53.1°F | +5.2°F | 20.97 | 26.1 |
Source: observed years: ACIS, station USC00250355. A year counts only with all twelve months complete.
How does Arnold's climate compare?
Arnold is warmer than 21 of the other 136 places with their own NOAA record in Nebraska, and wetter than 38. Across the 7,247 U.S. stations with normals, its annual mean of 47.9°F is warmer than 31%.
In the Köppen classification computed from these normals, Arnold is Dwa: continental, dry-winter, hot summer. 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.
Questions about Arnold's climate
What is the coldest month in Arnold?
January, with a normal high of 36°F and a normal low of 13°F. The warmest is July (85°F by day, 62°F at night).
Does it snow in Arnold?
Yes: 31 inches in a normal year, falling on 13 days with 0.1 inch or more, the most in February (7.2 inches).
What is the rainiest month in Arnold?
June, with 4.06 in of precipitation in a normal year; the driest is January with 0.35 in.
What plant hardiness zone is Arnold in?
The USDA's 2023 map puts Arnold in zone 5a in ZIP code 69120, the nearest ZIP area.
How late can frost come in Arnold?
In half of years the last 32°F night comes after May 5; in one year in ten it comes after May 19. Waiting until May 19 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Nebraska climateThe statewide normals and every place in the state
- Callaway, NE16 miles from this station, 49.4°F a year
- Stapleton, NE17 miles from this station, 48.2°F a year
- Anselmo, NE22 miles from this station, 47.5°F a year
- Brady, NE29 miles from this station, 50.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made