Lebanon, Oregon climate: Normal weather by month, frost dates and records
Lebanon's normal year runs from 36°F December nights to 86°F August afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.7°C, December lows of 2°C, August highs of 30°C.
- NOAA stationLebanon
- Station IDUSC00354819
- Location44.53°N 122.90°W
- Elevation330 ft (101 m)
- Population19,950
On October 23, the normal high in Lebanon is 62°F and the normal low 44°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Lebanon.
- Jan 49° 37°
- Feb 53° 37°
- Mar 58° 39°
- Apr 62° 42°
- May 69° 47°
- Jun 76° 52°
- Jul 85° 55°
- Aug 86° 56°
- Sep 79° 51°
- Oct 65° 45°
- Nov 54° 40°
- Dec 47° 36°
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 Lebanon each month?
August is the warmest month, with normal highs of 86°F; December the coldest, with normal lows of 36°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 49°F | 37°F | 42.8°F | – | <1 | 10 | 9 h 10 min |
| February | 53°F | 37°F | 44.7°F | – | <1 | 8 | 10 h 30 min |
| March | 58°F | 39°F | 48.2°F | – | <1 | 4 | 11 h 50 min |
| April | 62°F | 42°F | 51.9°F | – | <1 | 1 | 13 h 30 min |
| May | 69°F | 47°F | 58.3°F | – | 1 | <1 | 14 h 50 min |
| June | 76°F | 52°F | 63.8°F | – | 2 | <1 | 15 h 30 min |
| July | 85°F | 55°F | 70.1°F | – | 11 | <1 | 15 h 20 min |
| August | 86°F | 56°F | 70.7°F | – | 12 | <1 | 14 h 10 min |
| September | 79°F | 51°F | 64.9°F | – | 5 | <1 | 12 h 40 min |
| October | 65°F | 45°F | 55.0°F | – | <1 | 1 | 11 h |
| November | 54°F | 40°F | 46.9°F | – | <1 | 4 | 9 h 40 min |
| December | 47°F | 36°F | 41.7°F | – | <1 | 11 | 8 h 50 min |
| Year (annual) | 65°F | 45°F | 54.9°F | – | 30 | 39 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | 9°C | 3°C | 6.0°C |
| February | 12°C | 3°C | 7.1°C |
| March | 14°C | 4°C | 9.0°C |
| April | 17°C | 5°C | 11.1°C |
| May | 21°C | 8°C | 14.6°C |
| June | 24°C | 11°C | 17.7°C |
| July | 29°C | 13°C | 21.2°C |
| August | 30°C | 13°C | 21.5°C |
| September | 26°C | 10°C | 18.3°C |
| October | 18°C | 7°C | 12.8°C |
| November | 12°C | 4°C | 8.3°C |
| December | 8°C | 2°C | 5.4°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Lacomb (11 miles away), gets 2 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00354819; 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 Lebanon?
Normal highs sit between 65°F and 85°F in May, June, July, September and October.
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 USC00354819.
When is the last frost in Lebanon?
In Lebanon, the last spring frost (32°F) comes after March 14 in half of years and after April 14 in one year in ten; the first autumn frost comes before November 18 in half of years and before October 27 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
- March 141 year in 10 after April 14; 9 in 10 after February 18
- First autumn frost, half of years before
- November 181 year in 10 before October 27; 9 in 10 before December 15
NOAA puts the median frost-free season at 248 days, and the season without a hard freeze (28°F) at 302 days.
A hard freeze (28°F) comes after February 15 in half of springs and before December 10 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Lebanon in zone 8b in ZIP code 97355, the nearest ZIP area.
Frost dates for every NOAA station in Oregon · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00354819; 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 Lebanon?
In a normal year in Lebanon, 30 days a year reach 90°F (5 of them 100°F or more) and 39 nights fall to 32°F or colder.
- Days at 90°F or more
- 30a normal year
- Days at 100°F or more
- 5a normal year
- Nights at 32°F or colder
- 39a normal year
- Days that stay below freezing
- 2high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00354819.
How sunny is Lebanon?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Lebanon, 3.9 kWh per square metre a day. July is the sunniest month (89%) and December the cloudiest (53%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 56% | 1.3 |
| February | 61% | 2.2 |
| March | 59% | 3.1 |
| April | 64% | 4.5 |
| May | 70% | 5.7 |
| June | 74% | 6.4 |
| July | 89% | 7.4 |
| August | 88% | 6.3 |
| September | 81% | 4.6 |
| October | 70% | 2.8 |
| November | 58% | 1.5 |
| December | 53% | 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 Lebanon need?
A normal year in Lebanon brings 4,149 heating degree days, 23% fewer than the median U.S. place (5,373), and 494 cooling degree days, 46% 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 2,778 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 688 | 0 |
| February | 568 | 0 |
| March | 519 | 0 |
| April | 394 | 1 |
| May | 219 | 13 |
| June | 89 | 53 |
| July | 12 | 170 |
| August | 10 | 185 |
| September | 72 | 69 |
| October | 313 | 3 |
| November | 543 | 0 |
| December | 721 | 0 |
| Year (annual) | 4,149 | 494 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00354819. 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.
How does Lebanon's climate compare?
Lebanon is warmer than 94 of the other 104 places with their own NOAA record in Oregon. Across the 7,247 U.S. stations with normals, its annual mean of 54.9°F is warmer than 60%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near Lebanon share this climate record?
7 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.
- Brownsville, OR1,859 people · 11 mi SW
- South Lebanon, OR1,044 people · 2 mi S
- Halsey, OR953 people · 15 mi SW
- Crabtree, OR717 people · 7 mi N
- Sodaville, OR373 people · 4 mi SE
- Waterloo, OR226 people · 5 mi SE
- Shedd, OR87 people · 12 mi SW
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 Lebanon's climate
What is the coldest month in Lebanon?
December, with a normal high of 47°F and a normal low of 36°F. The warmest is August (86°F by day, 56°F at night).
Does it snow in Lebanon?
Yes. NOAA publishes no 1991-2020 snowfall normal for Lebanon's NOAA station; the nearest record that keeps one, Lacomb (11 miles away), records 2 inches of snow in a normal year.
What plant hardiness zone is Lebanon in?
The USDA's 2023 map puts Lebanon in zone 8b in ZIP code 97355, the nearest ZIP area.
How late can frost come in Lebanon?
In half of years the last 32°F night comes after March 14; in one year in ten it comes after April 14. Waiting until April 14 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon climateThe statewide normals and every place in the state
- Lacomb, OR11 miles from this station, 51.4°F a year
- Foster Dam, OR14 miles from this station, 52.4°F a year
- Corvallis, OR16 miles from this station, 52.9°F a year
- Stayton, OR18 miles from this station, 52.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made