Dallas, Oregon climate: Normal weather by month, frost dates and records
Dallas's normal year runs from 35°F December nights to 83°F August afternoons, with 47.8 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.7°C, December lows of 2°C, August highs of 28°C, 1,214 mm of precipitation a year.
- NOAA stationDallas (2 mi NE)
- Station IDUSC00352112
- Location44.95°N 123.29°W
- Elevation290 ft (88 m)
- From the center2 miles
- Population17,911
On October 23, the normal high in Dallas is 61°F and the normal low 43°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Dallas.
- Jan 47° 35°
- Feb 51° 36°
- Mar 56° 38°
- Apr 61° 40°
- May 68° 45°
- Jun 73° 49°
- Jul 83° 52°
- Aug 83° 52°
- Sep 78° 49°
- Oct 65° 44°
- Nov 52° 38°
- Dec 46° 35°
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 Dallas each month?
August is the warmest month, with normal highs of 83°F; December the coldest, with normal lows of 35°F. The most precipitation falls in December (8.74 in), the least in July (0.31 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 47°F | 35°F | 40.9°F | 7.48 | – | <1 | 11 | 9 h 10 min |
| February | 51°F | 36°F | 43.1°F | 5.56 | – | <1 | 9 | 10 h 20 min |
| March | 56°F | 38°F | 46.7°F | 5.08 | – | <1 | 7 | 11 h 50 min |
| April | 61°F | 40°F | 50.4°F | 3.71 | – | <1 | 3 | 13 h 30 min |
| May | 68°F | 45°F | 56.7°F | 2.36 | – | <1 | <1 | 14 h 50 min |
| June | 73°F | 49°F | 61.0°F | 1.49 | – | 2 | <1 | 15 h 30 min |
| July | 83°F | 52°F | 67.3°F | 0.31 | – | 6 | <1 | 15 h 20 min |
| August | 83°F | 52°F | 67.6°F | 0.47 | – | 7 | <1 | 14 h 10 min |
| September | 78°F | 49°F | 63.4°F | 1.60 | – | 3 | <1 | 12 h 40 min |
| October | 65°F | 44°F | 54.2°F | 3.80 | – | <1 | 2 | 11 h |
| November | 52°F | 38°F | 45.3°F | 7.18 | – | <1 | 6 | 9 h 40 min |
| December | 46°F | 35°F | 40.1°F | 8.74 | – | <1 | 12 | 8 h 50 min |
| Year (annual) | 63°F | 43°F | 53.1°F | 47.78 | – | 17 | 49 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 8°C | 2°C | 4.9°C | 190 mm |
| February | 10°C | 2°C | 6.2°C | 141 mm |
| March | 13°C | 3°C | 8.2°C | 129 mm |
| April | 16°C | 5°C | 10.2°C | 94 mm |
| May | 20°C | 7°C | 13.7°C | 60 mm |
| June | 23°C | 9°C | 16.1°C | 38 mm |
| July | 28°C | 11°C | 19.6°C | 8 mm |
| August | 28°C | 11°C | 19.8°C | 12 mm |
| September | 25°C | 10°C | 17.4°C | 41 mm |
| October | 18°C | 7°C | 12.3°C | 97 mm |
| November | 11°C | 4°C | 7.4°C | 182 mm |
| December | 8°C | 2°C | 4.5°C | 222 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Falls City (11 miles away), gets 10 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00352112; 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 Dallas?
Normal highs sit between 65°F and 85°F in May, June, July, August and September.
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 USC00352112.
When is the last frost in Dallas?
In Dallas, the last spring frost (32°F) comes after April 16 in half of years and after May 5 in one year in ten; the first autumn frost comes before November 1 in half of years and before October 13 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
- April 161 year in 10 after May 5; 9 in 10 after March 21
- First autumn frost, half of years before
- November 11 year in 10 before October 13; 9 in 10 before November 22
NOAA puts the median frost-free season at 199 days, and the season without a hard freeze (28°F) at 258 days.
A hard freeze (28°F) comes after March 7 in half of springs and before November 20 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Dallas in zone 8b in ZIP code 97338, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Dallas's NOAA station is in zone 8b: the coldest night of a typical year reaches 18°F (28 complete years).
Frost dates for every NOAA station in Oregon · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00352112; 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 Dallas?
In a normal year in Dallas, 17 days a year reach 90°F (1 of them 100°F or more) and 49 nights fall to 32°F or colder.
- Days at 90°F or more
- 17a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 49a normal year
- Days that stay below freezing
- 2high of 32°F or less
The highest temperature in this station's record (since 1928) is 111°F, on June 28, 2021; the lowest is −11°F, on January 31, 1950.
The wettest calendar year on that record is 1937, with 69.62 in; the snowiest season is 1949–50, with 70.7 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00352112; records: ACIS (NOAA Regional Climate Centers), station USC00352112. Records use complete months only; a month missing more than three days is left out.
How sunny is Dallas?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Dallas, 3.9 kWh per square metre a day. July is the sunniest month (87%) and December the cloudiest (54%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 57% | 1.3 |
| February | 61% | 2.2 |
| March | 61% | 3.2 |
| April | 66% | 4.5 |
| May | 71% | 5.7 |
| June | 74% | 6.3 |
| July | 87% | 7.1 |
| August | 86% | 6.1 |
| September | 81% | 4.5 |
| October | 70% | 2.8 |
| November | 59% | 1.5 |
| December | 54% | 1.1 |
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 Dallas need?
A normal year in Dallas brings 4,633 heating degree days, 14% fewer than the median U.S. place (5,373), and 294 cooling degree days, 68% 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 2,317 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 747 | 0 |
| February | 613 | 0 |
| March | 567 | 0 |
| April | 437 | 1 |
| May | 266 | 9 |
| June | 146 | 26 |
| July | 30 | 101 |
| August | 27 | 108 |
| September | 96 | 47 |
| October | 339 | 3 |
| November | 593 | 0 |
| December | 770 | 0 |
| Year (annual) | 4,633 | 294 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00352112. 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 Dallas been warmer than normal lately?
2025 averaged 54.1°F, 1.0°F above the 1991-2020 normal of 53.1°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 53.7°F | +0.6°F | 48.46 |
| 2022 | 53.4°F | +0.3°F | – |
| 2023 | 53.8°F | +0.6°F | – |
| 2024 | 54.2°F | +1.1°F | – |
| 2025 | 54.1°F | +1.0°F | – |
Over 68 complete years from 1937 to 2025, the station's annual mean temperature rose at a fitted 2.5°F per century (+0.14°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00352112; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Dallas's climate compare?
Dallas is warmer than 71 of the other 104 places with their own NOAA record in Oregon, and wetter than 67. Across the 7,247 U.S. stations with normals, its annual mean of 53.1°F is warmer than 54%.
In the Köppen classification computed from these normals, Dallas is Csb: temperate, 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.
Which places near Dallas share this climate record?
4 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Monmouth, OR11,651 people · 7 mi SE
- Independence, OR10,295 people · 8 mi SE
- Sheridan, OR6,375 people · 12 mi NW
- Rickreall, OR0 people · 3 mi E
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Dallas's climate
What is the coldest month in Dallas?
December, with a normal high of 46°F and a normal low of 35°F. The warmest is August (83°F by day, 52°F at night).
Does it snow in Dallas?
Yes. NOAA publishes no 1991-2020 snowfall normal for Dallas's NOAA station; the nearest record that keeps one, Falls City (11 miles away), records 10 inches of snow in a normal year.
What is the rainiest month in Dallas?
December, with 8.74 in of precipitation in a normal year; the driest is July with 0.31 in.
What plant hardiness zone is Dallas in?
The USDA's 2023 map puts Dallas in zone 8b in ZIP code 97338, the nearest ZIP area. By the same method at Dallas's NOAA station, the coldest night of a typical year reaches 18°F (28 years, 1991-2020): zone 8b.
How late can frost come in Dallas?
In half of years the last 32°F night comes after April 16; in one year in ten it comes after May 5. Waiting until May 5 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon climateThe statewide normals and every place in the state
- Falls City, OR11 miles from this station, 50.9°F a year
- Laurel Mountain, OR14 miles from this station, 46.3°F a year
- Salem, OR14 miles from this station, 54.1°F a year
- McMinnville, OR19 miles from this station, 52.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made