Klamath, California climate: Normal weather by month, frost dates and records
Klamath's normal year runs from 38°F December nights to 66°F July afternoons, with 78.9 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.3°C, December lows of 3°C, July highs of 19°C, 2,004 mm of precipitation a year.
- NOAA stationKlamath
- Station IDUSC00044577
- Location41.58°N 124.07°W
- Elevation28 ft (9 m)
- From the center1 miles
- Population (census place)816
On October 24, the normal high in Klamath is 62°F and the normal low 43°F, and the chance of measurable rain or snow is 29%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Klamath.
- Jan 55° 39°
- Feb 56° 39°
- Mar 57° 40°
- Apr 59° 43°
- May 61° 47°
- Jun 64° 47°
- Jul 66° 53°
- Aug 66° 51°
- Sep 67° 50°
- Oct 63° 45°
- Nov 58° 41°
- Dec 54° 38°
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 each month?
July is the warmest month, with normal highs of 66°F; December the coldest, with normal lows of 38°F. The most precipitation falls in December (15.25 in), the least in July (0.26 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 55°F | 39°F | 47.0°F | 13.38 | 18 | <1 | 5 | 9 h 30 min |
| February | 56°F | 39°F | 47.4°F | 10.67 | 17 | <1 | 5 | 10 h 40 min |
| March | 57°F | 40°F | 48.5°F | 10.65 | 16 | <1 | 3 | 11 h 50 min |
| April | 59°F | 43°F | 50.7°F | 6.64 | 16 | <1 | 2 | 13 h 20 min |
| May | 61°F | 47°F | 53.8°F | 3.59 | 10 | <1 | 1 | 14 h 30 min |
| June | 64°F | 47°F | 55.3°F | 1.78 | 5 | <1 | <1 | 15 h 10 min |
| July | 66°F | 53°F | 59.4°F | 0.26 | 2 | <1 | <1 | 15 h |
| August | 66°F | 51°F | 58.6°F | 0.33 | 2 | <1 | <1 | 13 h 50 min |
| September | 67°F | 50°F | 58.2°F | 1.26 | 3 | <1 | <1 | 12 h 30 min |
| October | 63°F | 45°F | 54.1°F | 4.99 | 7 | <1 | 1 | 11 h 10 min |
| November | 58°F | 41°F | 49.3°F | 10.09 | 16 | <1 | 4 | 9 h 50 min |
| December | 54°F | 38°F | 46.1°F | 15.25 | 18 | <1 | 6 | 9 h 10 min |
| Year (annual) | 61°F | 44°F | 52.4°F | 78.89 | 128 | <1 | 26 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 13°C | 4°C | 8.3°C | 340 mm |
| February | 13°C | 4°C | 8.6°C | 271 mm |
| March | 14°C | 5°C | 9.2°C | 271 mm |
| April | 15°C | 6°C | 10.4°C | 169 mm |
| May | 16°C | 8°C | 12.1°C | 91 mm |
| June | 18°C | 8°C | 12.9°C | 45 mm |
| July | 19°C | 12°C | 15.2°C | 7 mm |
| August | 19°C | 11°C | 14.8°C | 8 mm |
| September | 19°C | 10°C | 14.6°C | 32 mm |
| October | 17°C | 7°C | 12.3°C | 127 mm |
| November | 14°C | 5°C | 9.6°C | 256 mm |
| December | 12°C | 3°C | 7.8°C | 387 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00044577; 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?
Normal highs sit between 65°F and 85°F in July, 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 USC00044577.
When is the last frost in Klamath?
In Klamath, the last spring frost (32°F) comes after March 16 in half of years and after April 20 in one year in ten; the first autumn frost comes before November 20 in half of years and before October 30 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 161 year in 10 after April 20; 9 in 10 after February 8
- First autumn frost, half of years before
- November 201 year in 10 before October 30; 9 in 10 before December 18
NOAA puts the median frost-free season at 252 days, and the season without a hard freeze (28°F) at 319 days.
A hard freeze (28°F) comes after February 4 in half of springs and before December 11 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Klamath in zone 9b in ZIP code 95548.
Frost dates for every NOAA station in California · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00044577; 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 Klamath?
In a normal year in Klamath, a 90°F day is rare, 26 nights fall to 32°F or colder and 128 days bring measurable precipitation.
- Days at 90°F or more
- fewer than 1a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 26a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 128a normal year
The highest temperature in this station's record (since 1949) is 98°F, on October 10, 1991; the lowest is 16°F, on December 9, 1972.
The wettest calendar year on that record is 1983, with 124.37 in; the snowiest season is 1988–89, with 19.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00044577; records: ACIS (NOAA Regional Climate Centers), station USC00044577. Records use complete months only; a month missing more than three days is left out.
How sunny is Klamath?
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Klamath, 4.2 kWh per square metre a day. June is the sunniest month (80%) and December the cloudiest (62%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 65% | 1.8 |
| February | 67% | 2.6 |
| March | 69% | 3.8 |
| April | 73% | 5.2 |
| May | 77% | 6.2 |
| June | 80% | 6.9 |
| July | 80% | 6.6 |
| August | 76% | 5.5 |
| September | 78% | 4.6 |
| October | 74% | 3.2 |
| November | 68% | 2.0 |
| 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 need?
A normal year in Klamath brings 4,602 heating degree days, 14% fewer than the median U.S. place (5,373), and 7 cooling degree days, 99% 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 1,481 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 557 | 0 |
| February | 491 | 0 |
| March | 513 | 0 |
| April | 429 | 0 |
| May | 346 | 0 |
| June | 290 | 0 |
| July | 174 | 2 |
| August | 199 | 1 |
| September | 207 | 2 |
| October | 339 | 1 |
| November | 473 | 0 |
| December | 586 | 0 |
| Year (annual) | 4,602 | 7 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00044577. 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 Klamath's climate compare?
Klamath is warmer than 28 of the other 218 places with their own NOAA record in California, and wetter than 212. Across the 7,247 U.S. stations with normals, its annual mean of 52.4°F is warmer than 51%.
In the Köppen classification computed from these normals, Klamath 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.
Questions about Klamath's climate
What is the coldest month in Klamath?
December, with a normal high of 54°F and a normal low of 38°F. The warmest is July (66°F by day, 53°F at night).
Does it snow in Klamath?
Rarely: NOAA's normal is no measurable snow a year.
What is the rainiest month in Klamath?
December, with 15.25 in of precipitation in a normal year; the driest is July with 0.26 in.
What plant hardiness zone is Klamath in?
The USDA's 2023 map puts Klamath in zone 9b in ZIP code 95548.
How late can frost come in Klamath?
In half of years the last 32°F night comes after March 16; in one year in ten it comes after April 20. Waiting until April 20 leaves about a one-in-ten chance of a later frost.
Nearby and next
- California climateThe statewide normals and every place in the state
- Orick, CA16 miles from this station, 50.9°F a year
- Crescent City, CA16 miles from this station, 52.9°F a year
- Orleans, CA34 miles from this station, 57.8°F a year
- Brookings, OR34 miles from this station, 53.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made