Klamath Falls, Oregon climate: Normal weather by month, frost dates and records
Klamath Falls's normal year runs from 21°F December nights to 86°F July afternoons, with 11.1 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.4°C, December lows of −6°C, July highs of 30°C, 283 mm of precipitation a year.
- NOAA stationKlamath Falls International Airport
- Station IDUSW00094236
- Location42.15°N 121.72°W
- Elevation4,084 ft (1,245 m)
- Population22,174
On October 22, the normal high in Klamath Falls is 61°F and the normal low 29°F, and the chance of measurable rain or snow is 21%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Klamath Falls.
- Jan 42° 22°
- Feb 46° 24°
- Mar 52° 27°
- Apr 58° 29°
- May 67° 36°
- Jun 76° 41°
- Jul 86° 48°
- Aug 85° 47°
- Sep 78° 39°
- Oct 64° 31°
- Nov 49° 25°
- Dec 40° 21°
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 Klamath Falls each month?
July is the warmest month, with normal highs of 86°F; December the coldest, with normal lows of 21°F. The most precipitation falls in December (1.80 in), the least in July (0.22 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 42°F | 22°F | 31.5°F | 1.51 | 11 | <1 | 28 | 9 h 30 min |
| February | 46°F | 24°F | 34.9°F | 1.12 | 9 | <1 | 25 | 10 h 30 min |
| March | 52°F | 27°F | 39.4°F | 1.03 | 11 | <1 | 25 | 11 h 50 min |
| April | 58°F | 29°F | 43.5°F | 1.06 | 9 | <1 | 21 | 13 h 20 min |
| May | 67°F | 36°F | 51.7°F | 1.04 | 8 | <1 | 9 | 14 h 30 min |
| June | 76°F | 41°F | 58.8°F | 0.66 | 5 | 2 | 2 | 15 h 10 min |
| July | 86°F | 48°F | 67.1°F | 0.22 | 2 | 9 | <1 | 15 h |
| August | 85°F | 47°F | 65.6°F | 0.28 | 2 | 6 | <1 | 14 h |
| September | 78°F | 39°F | 58.2°F | 0.30 | 3 | 1 | 3 | 12 h 30 min |
| October | 64°F | 31°F | 47.4°F | 0.74 | 6 | <1 | 19 | 11 h 10 min |
| November | 49°F | 25°F | 37.0°F | 1.38 | 10 | <1 | 24 | 9 h 50 min |
| December | 40°F | 21°F | 30.4°F | 1.80 | 12 | <1 | 28 | 9 h 10 min |
| Year (annual) | 62°F | 32°F | 47.1°F | 11.14 | 88 | 18 | 184 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 5°C | −6°C | −0.3°C | 38 mm |
| February | 8°C | −5°C | 1.6°C | 28 mm |
| March | 11°C | −3°C | 4.1°C | 26 mm |
| April | 14°C | −2°C | 6.4°C | 27 mm |
| May | 20°C | 2°C | 10.9°C | 26 mm |
| June | 25°C | 5°C | 14.9°C | 17 mm |
| July | 30°C | 9°C | 19.5°C | 6 mm |
| August | 29°C | 8°C | 18.7°C | 7 mm |
| September | 25°C | 4°C | 14.6°C | 8 mm |
| October | 18°C | −1°C | 8.6°C | 19 mm |
| November | 10°C | −4°C | 2.8°C | 35 mm |
| December | 5°C | −6°C | −0.9°C | 46 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Keno (10 miles away), gets 52 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00094236; 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 Klamath Falls?
Normal highs sit between 65°F and 85°F in May, June, August and September. Of those, August has the fewest days with rain (2).
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 USW00094236.
When is the last frost in Klamath Falls?
In Klamath Falls, the last spring frost (32°F) comes after June 9 in half of years and after June 26 in one year in ten; the first autumn frost comes before September 18 in half of years and before September 4 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
- June 91 year in 10 after June 26; 9 in 10 after May 22
- First autumn frost, half of years before
- September 181 year in 10 before September 4; 9 in 10 before October 1
NOAA puts the median frost-free season at 99 days, and the season without a hard freeze (28°F) at 132 days.
A hard freeze (28°F) comes after May 21 in half of springs and before October 2 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Klamath Falls in zone 6b in ZIP code 97634, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Klamath Falls's NOAA station is in zone 6b: the coldest night of a typical year reaches −2°F (23 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 USW00094236; 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 Klamath Falls?
In a normal year in Klamath Falls, 18 days a year reach 90°F, 184 nights fall to 32°F or colder and 88 days bring measurable precipitation.
- Days at 90°F or more
- 18a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 184a normal year
- Days that stay below freezing
- 12high of 32°F or less
- Days with 0.01 inch of precipitation
- 88a normal year
The highest temperature in Klamath Falls's official record (kept by the National Weather Service since 1897) is 104°F, on August 7, 1972; the lowest is −20°F, on December 8, 2013.
The wettest calendar year on that record is 1996, with 21.05 in; the snowiest season is 1955–56, with 100.6 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USW00094236; records: ACIS (NOAA Regional Climate Centers), NWS threaded record LMTthr. Records use complete months only; a month missing more than three days is left out.
How humid and windy is Klamath Falls, and how clear are its skies?
The summer (June-August) dew point averages 44°F. The muggiest month is July, with an average dew point of 46°F; the driest air comes in December (24°F). March is the windiest month (8.0 mph on average), and August has the most clear or nearly clear hours (80%).
| Month | Dew point | Humidity | Afternoon humidity | Wind | Clear or few clouds | Overcast |
|---|---|---|---|---|---|---|
| January | 26°F | 76% | 57% | 6.3 mph | 41% | 28% |
| February | 26°F | 71% | 49% | 7.4 mph | 39% | 27% |
| March | 29°F | 64% | 40% | 8.0 mph | 42% | 22% |
| April | 32°F | 57% | 32% | 7.7 mph | 51% | 16% |
| May | 40°F | 57% | 31% | 7.1 mph | 52% | 13% |
| June | 44°F | 51% | 24% | 6.4 mph | 74% | 4% |
| July | 46°F | 50% | 21% | 5.5 mph | 80% | 2% |
| August | 42°F | 51% | 22% | 5.4 mph | 80% | 2% |
| September | 36°F | 55% | 26% | 5.2 mph | 70% | 5% |
| October | 31°F | 68% | 42% | 5.5 mph | 51% | 19% |
| November | 26°F | 79% | 62% | 5.9 mph | 41% | 28% |
| December | 24°F | 81% | 66% | 6.0 mph | 37% | 32% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094236. Monthly averages of all hours; afternoon humidity at 3 p.m. local standard time; sky as the share of hours NOAA's observations rate clear or few clouds (a dash where NOAA publishes no sky value).
How sunny is Klamath Falls?
Over a year 82% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Klamath Falls, 4.7 kWh per square metre a day. July is the sunniest month (94%) and December the cloudiest (62%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 67% | 1.9 |
| February | 70% | 2.8 |
| March | 71% | 4.0 |
| April | 75% | 5.5 |
| May | 80% | 6.8 |
| June | 88% | 7.8 |
| July | 94% | 8.0 |
| August | 93% | 7.0 |
| September | 90% | 5.5 |
| October | 82% | 3.6 |
| November | 70% | 2.1 |
| December | 62% | 1.5 |
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 Klamath Falls need?
A normal year in Klamath Falls brings 6,710 heating degree days, 25% more than the median U.S. place (5,373), and 217 cooling degree days, 76% 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 1,747 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,039 | 0 |
| February | 843 | 0 |
| March | 794 | 0 |
| April | 647 | 0 |
| May | 415 | 3 |
| June | 207 | 21 |
| July | 41 | 104 |
| August | 54 | 74 |
| September | 216 | 14 |
| October | 544 | 0 |
| November | 840 | 0 |
| December | 1,071 | 0 |
| Year (annual) | 6,710 | 217 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00094236. 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 Klamath Falls been warmer than normal lately?
2025 averaged 48.8°F, 1.6°F above the 1991-2020 normal of 47.1°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 48.1°F | +1.0°F | 7.05 |
| 2022 | 47.0°F | −0.1°F | 8.64 |
| 2023 | 47.3°F | +0.2°F | 9.12 |
| 2024 | 48.7°F | +1.6°F | 13.59 |
| 2025 | 48.8°F | +1.6°F | 14.40 |
Source: observed years: ACIS, station USW00094236. A year counts only with all twelve months complete.
How does Klamath Falls's climate compare?
Klamath Falls is warmer than 13 of the other 104 places with their own NOAA record in Oregon, and wetter than 13. Across the 7,247 U.S. stations with normals, its annual mean of 47.1°F is warmer than 28%.
In the Köppen classification computed from these normals, Klamath Falls 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.
Which places near Klamath Falls 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.
- Altamont, OR19,844 people · 4 mi N
- Running Y Ranch, OR841 people · 12 mi NW
- Falcon Heights, OR758 people · 2 mi SW
- Sprague River, OR0 people · 24 mi NE
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 Klamath Falls's climate
What is the coldest month in Klamath Falls?
December, with a normal high of 40°F and a normal low of 21°F. The warmest is July (86°F by day, 48°F at night).
Does it snow in Klamath Falls?
Yes. NOAA publishes no 1991-2020 snowfall normal for Klamath Falls's NOAA station; the nearest record that keeps one, Keno (10 miles away), records 52 inches of snow in a normal year.
What is the rainiest month in Klamath Falls?
December, with 1.80 in of precipitation in a normal year; the driest is July with 0.22 in.
What plant hardiness zone is Klamath Falls in?
The USDA's 2023 map puts Klamath Falls in zone 6b in ZIP code 97634, the nearest ZIP area. By the same method at Klamath Falls's NOAA station, the coldest night of a typical year reaches −2°F (23 years, 1991-2020): zone 6b.
How late can frost come in Klamath Falls?
In half of years the last 32°F night comes after June 9; in one year in ten it comes after June 26. Waiting until June 26 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Klamath Falls in OctoberThis month day by day, its records and recent years
- Oregon climateThe statewide normals and every place in the state
- Keno, OR10 miles from this station, 47.5°F a year
- Tulelake, CA18 miles from this station, 47.4°F a year
- Gerber Dam, OR30 miles from this station, 46.6°F a year
- Lava Beds Nat Mon, CA33 miles from this station, 48.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made