Halfway, Oregon climate: Normal weather by month, frost dates and records
Halfway's normal year runs from 19°F January nights to 90°F July afternoons, with 21.3 inches of precipitation and 62 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.8°C, January lows of −7°C, July highs of 32°C, 540 mm of precipitation a year.
- NOAA stationHalfway
- Station IDUSC00353604
- Location44.88°N 117.11°W
- Elevation2,653 ft (809 m)
- Population358
On October 23, the normal high in Halfway is 58°F and the normal low 32°F, and the chance of measurable rain or snow is 25%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Halfway.
- Jan 32° 19°
- Feb 39° 22°
- Mar 51° 30°
- Apr 62° 34°
- May 71° 41°
- Jun 79° 47°
- Jul 90° 52°
- Aug 89° 50°
- Sep 79° 42°
- Oct 63° 33°
- Nov 45° 27°
- Dec 33° 20°
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 Halfway each month?
July is the warmest month, with normal highs of 90°F; January the coldest, with normal lows of 19°F. The most precipitation falls in December (3.78 in), the least in August (0.32 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 32°F | 19°F | 25.4°F | 3.57 | 22.8 | 13 | <1 | 30 | 9 h 10 min |
| February | 39°F | 22°F | 30.4°F | 2.08 | 9.3 | 10 | <1 | 26 | 10 h 20 min |
| March | 51°F | 30°F | 40.6°F | 1.85 | 2.0 | 10 | <1 | 23 | 11 h 50 min |
| April | 62°F | 34°F | 47.9°F | 1.55 | 0.3 | 10 | <1 | 16 | 13 h 30 min |
| May | 71°F | 41°F | 56.1°F | 1.78 | 0.0 | 9 | 1 | 7 | 14 h 50 min |
| June | 79°F | 47°F | 62.8°F | 1.31 | 0.0 | 7 | 4 | 1 | 15 h 30 min |
| July | 90°F | 52°F | 70.8°F | 0.48 | 0.0 | 3 | 20 | <1 | 15 h 20 min |
| August | 89°F | 50°F | 69.3°F | 0.32 | 0.0 | 3 | 18 | <1 | 14 h 10 min |
| September | 79°F | 42°F | 60.5°F | 0.68 | 0.0 | 4 | 4 | 5 | 12 h 40 min |
| October | 63°F | 33°F | 48.0°F | 1.31 | 0.0 | 6 | <1 | 17 | 11 h |
| November | 45°F | 27°F | 36.1°F | 2.56 | 6.3 | 11 | <1 | 24 | 9 h 40 min |
| December | 33°F | 20°F | 26.6°F | 3.78 | 21.6 | 13 | <1 | 30 | 8 h 50 min |
| Year (annual) | 61°F | 35°F | 47.9°F | 21.27 | 62.3 | 99 | 47 | 179 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 0°C | −7°C | −3.7°C | 91 mm | 58 cm |
| February | 4°C | −5°C | −0.9°C | 53 mm | 24 cm |
| March | 11°C | −1°C | 4.8°C | 47 mm | 5 cm |
| April | 16°C | 1°C | 8.8°C | 39 mm | 1 cm |
| May | 22°C | 5°C | 13.4°C | 45 mm | 0 cm |
| June | 26°C | 8°C | 17.1°C | 33 mm | 0 cm |
| July | 32°C | 11°C | 21.6°C | 12 mm | 0 cm |
| August | 31°C | 10°C | 20.7°C | 8 mm | 0 cm |
| September | 26°C | 6°C | 15.8°C | 17 mm | 0 cm |
| October | 17°C | 1°C | 8.9°C | 33 mm | 0 cm |
| November | 7°C | −3°C | 2.3°C | 65 mm | 16 cm |
| December | 1°C | −6°C | −3.0°C | 96 mm | 55 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00353604; 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 Halfway?
Normal highs sit between 65°F and 85°F in May, June and September. Of those, September has the fewest days with rain (4).
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 USC00353604.
When is the last frost in Halfway?
In Halfway, the last spring frost (32°F) comes after May 15 in half of years and after June 2 in one year in ten; the first autumn frost comes before September 24 in half of years and before September 9 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 151 year in 10 after June 2; 9 in 10 after May 2
- First autumn frost, half of years before
- September 241 year in 10 before September 9; 9 in 10 before October 6
NOAA puts the median frost-free season at 130 days, and the season without a hard freeze (28°F) at 155 days.
A hard freeze (28°F) comes after May 2 in half of springs and before October 5 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Halfway in zone 6b in ZIP code 97870, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Halfway's NOAA station is in zone 6a: the coldest night of a typical year reaches −10°F (28 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 Oregon · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00353604; 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 Halfway?
In a normal year in Halfway, 47 days a year reach 90°F (4 of them 100°F or more), 179 nights fall to 32°F or colder and 99 days bring measurable precipitation.
- Days at 90°F or more
- 47a normal year
- Days at 100°F or more
- 4a normal year
- Nights at 32°F or colder
- 179a normal year
- Days that stay below freezing
- 30high of 32°F or less
- Days with 0.01 inch of precipitation
- 99a normal year
- Days with 1 inch of snow or more
- 17a normal year
The highest temperature in this station's record (since 1936) is 110°F, on July 12, 1990; the lowest is −34°F, on January 25, 1949.
The wettest calendar year on that record is 1998, with 30.54 in; the snowiest season is 1938–39, with 160.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00353604; records: ACIS (NOAA Regional Climate Centers), station USC00353604. Records use complete months only; a month missing more than three days is left out.
How sunny is Halfway?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Halfway, 4.4 kWh per square metre a day. July is the sunniest month (92%) and December the cloudiest (58%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 61% | 1.5 |
| February | 68% | 2.5 |
| March | 70% | 3.8 |
| April | 77% | 5.5 |
| May | 79% | 6.5 |
| June | 83% | 7.3 |
| July | 92% | 7.7 |
| August | 91% | 6.6 |
| September | 87% | 5.0 |
| October | 80% | 3.3 |
| November | 68% | 1.9 |
| December | 58% | 1.2 |
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 Halfway need?
A normal year in Halfway brings 6,656 heating degree days, 24% more than the median U.S. place (5,373), and 450 cooling degree days, 50% 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 2,282 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,226 | 0 |
| February | 969 | 0 |
| March | 755 | 0 |
| April | 512 | 0 |
| May | 283 | 7 |
| June | 117 | 51 |
| July | 19 | 201 |
| August | 27 | 159 |
| September | 167 | 31 |
| October | 527 | 0 |
| November | 866 | 0 |
| December | 1,189 | 0 |
| Year (annual) | 6,656 | 450 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00353604. 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 Halfway been warmer than normal lately?
2025 averaged 50.8°F, 2.9°F above the 1991-2020 normal of 47.9°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 49.1°F | +1.2°F | 17.72 | 70.9 |
| 2022 | 46.3°F | −1.6°F | 17.92 | 54.5 |
| 2023 | 48.5°F | +0.6°F | 18.14 | 21.4 |
| 2024 | 50.3°F | +2.4°F | 25.08 | 30.5 |
| 2025 | 50.8°F | +2.9°F | 19.71 | 47.7 |
Over 66 complete years from 1937 to 2025, the station's annual mean temperature rose at a fitted 1.7°F per century (+0.09°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00353604; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Halfway's climate compare?
Halfway is warmer than 20 of the other 104 places with their own NOAA record in Oregon, and wetter than 41. 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, Halfway is Dsb: continental, dry-summer, warm 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 Halfway's climate
What is the coldest month in Halfway?
January, with a normal high of 32°F and a normal low of 19°F. The warmest is July (90°F by day, 52°F at night).
Does it snow in Halfway?
Yes: 62 inches in a normal year, falling on 21 days with 0.1 inch or more, the most in January (22.8 inches).
What is the rainiest month in Halfway?
December, with 3.78 in of precipitation in a normal year; the driest is August with 0.32 in.
What plant hardiness zone is Halfway in?
The USDA's 2023 map puts Halfway in zone 6b in ZIP code 97870, the nearest ZIP area. By the same method at Halfway's NOAA station, the coldest night of a typical year reaches −10°F (28 years, 1991-2020): zone 6a.
How late can frost come in Halfway?
In half of years the last 32°F night comes after May 15; in one year in ten it comes after June 2. Waiting until June 2 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon climateThe statewide normals and every place in the state
- Richland, OR8 miles from this station, 49.5°F a year
- Brownlee Dam, ID11 miles from this station, 55.0°F a year
- Cambridge, ID30 miles from this station, 48.3°F a year
- Joseph, OR33 miles from this station, 44.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made