Summer Lake (1 mi S), Oregon climate: Climate normals at a NOAA weather station
Summer Lake (1 mi S)'s normal year runs from 21°F December nights to 90°F July afternoons, with 13.1 inches of precipitation and 7 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.3°C, December lows of −6°C, July highs of 32°C, 332 mm of precipitation a year.
- NOAA stationSummer Lake (1 mi S)
- Station IDUSC00358173
- Location42.96°N 120.79°W
- Elevation4,192 ft (1,278 m)
On October 23, the normal high in Summer Lake (1 mi S) is 63°F and the normal low 30°F, and the chance of measurable rain or snow is 26%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Summer Lake (1 mi S).
- Jan 44° 22°
- Feb 48° 23°
- Mar 54° 27°
- Apr 60° 31°
- May 70° 37°
- Jun 79° 43°
- Jul 90° 49°
- Aug 89° 47°
- Sep 81° 40°
- Oct 66° 32°
- Nov 51° 26°
- Dec 43° 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 at Summer Lake (1 mi S) each month?
July is the warmest month, with normal highs of 90°F; December the coldest, with normal lows of 21°F. The most precipitation falls in December (1.85 in), the least in July (0.38 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 44°F | 22°F | 32.9°F | 1.58 | 2.0 | 13 | <1 | 25 | 9 h 20 min |
| February | 48°F | 23°F | 35.4°F | 1.20 | 1.6 | 11 | <1 | 22 | 10 h 30 min |
| March | 54°F | 27°F | 40.5°F | 1.20 | 0.5 | 12 | <1 | 21 | 11 h 50 min |
| April | 60°F | 31°F | 45.5°F | 1.18 | 0.0 | 13 | <1 | 14 | 13 h 20 min |
| May | 70°F | 37°F | 53.7°F | 1.41 | 0.0 | 11 | 1 | 4 | 14 h 40 min |
| June | 79°F | 43°F | 61.1°F | 0.82 | 0.0 | 7 | 4 | 1 | 15 h 20 min |
| July | 90°F | 49°F | 69.4°F | 0.38 | 0.0 | 4 | 18 | <1 | 15 h |
| August | 89°F | 47°F | 67.8°F | 0.42 | 0.0 | 3 | 15 | <1 | 14 h |
| September | 81°F | 40°F | 60.2°F | 0.60 | 0.0 | 4 | 5 | 2 | 12 h 30 min |
| October | 66°F | 32°F | 48.9°F | 0.94 | 0.0 | 7 | <1 | 13 | 11 h 10 min |
| November | 51°F | 26°F | 38.3°F | 1.48 | 0.8 | 11 | <1 | 21 | 9 h 50 min |
| December | 43°F | 21°F | 31.7°F | 1.85 | 2.5 | 13 | <1 | 26 | 9 h |
| Year (annual) | 65°F | 33°F | 48.8°F | 13.06 | 7.4 | 107 | 43 | 147 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 7°C | −6°C | 0.5°C | 40 mm | 5 cm |
| February | 9°C | −5°C | 1.9°C | 30 mm | 4 cm |
| March | 12°C | −3°C | 4.7°C | 30 mm | 1 cm |
| April | 16°C | −1°C | 7.5°C | 30 mm | 0 cm |
| May | 21°C | 3°C | 12.1°C | 36 mm | 0 cm |
| June | 26°C | 6°C | 16.2°C | 21 mm | 0 cm |
| July | 32°C | 9°C | 20.8°C | 10 mm | 0 cm |
| August | 32°C | 8°C | 19.9°C | 11 mm | 0 cm |
| September | 27°C | 4°C | 15.7°C | 15 mm | 0 cm |
| October | 19°C | 0°C | 9.4°C | 24 mm | 0 cm |
| November | 11°C | −4°C | 3.5°C | 38 mm | 2 cm |
| December | 6°C | −6°C | −0.2°C | 47 mm | 6 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00358173; 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.
Which months are mildest at Summer Lake (1 mi S)?
Normal highs sit between 65°F and 85°F in May, June, September and October. 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 USC00358173.
When is the last frost at Summer Lake (1 mi S)?
In Summer Lake (1 mi S), the last spring frost (32°F) comes after June 8 in half of years and after June 25 in one year in ten; the first autumn frost comes before September 15 in half of years and before August 31 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 81 year in 10 after June 25; 9 in 10 after May 20
- First autumn frost, half of years before
- September 151 year in 10 before August 31; 9 in 10 before September 28
NOAA puts the median frost-free season at 96 days, and the season without a hard freeze (28°F) at 130 days.
A hard freeze (28°F) comes after May 18 in half of springs and before September 29 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Summer Lake (1 mi S) in zone 6a in ZIP code 97638, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 7a: the coldest night of a typical year reaches 1°F (29 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 USC00358173; 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 at Summer Lake (1 mi S)?
In a normal year in Summer Lake (1 mi S), 43 days a year reach 90°F (3 of them 100°F or more), 147 nights fall to 32°F or colder and 107 days bring measurable precipitation.
- Days at 90°F or more
- 43a normal year
- Days at 100°F or more
- 3a normal year
- Nights at 32°F or colder
- 147a normal year
- Days that stay below freezing
- 7high of 32°F or less
- Days with 0.01 inch of precipitation
- 107a normal year
- Days with 1 inch of snow or more
- 4a normal year
The highest temperature in this station's record (since 1957) is 108°F, on July 30, 2022; the lowest is −27°F, on January 22, 1962.
The wettest calendar year on that record is 1964, with 22.40 in; the snowiest season is 1970–71, with 55.9 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00358173; records: ACIS (NOAA Regional Climate Centers), station USC00358173. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Summer Lake (1 mi S)?
Over a year 81% of the sunlight that would reach the ground under clear skies gets through the clouds at Summer Lake (1 mi S), 4.7 kWh per square metre a day. July is the sunniest month (93%) and December the cloudiest (62%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 67% | 1.9 |
| February | 69% | 2.8 |
| March | 70% | 4.0 |
| April | 74% | 5.4 |
| May | 78% | 6.6 |
| June | 86% | 7.7 |
| July | 93% | 8.0 |
| August | 92% | 6.9 |
| September | 89% | 5.4 |
| 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 many heating and cooling degree days does Summer Lake (1 mi S) record?
A normal year at Summer Lake (1 mi S) brings 6,240 heating degree days, 16% more than the median U.S. place (5,373), and 353 cooling degree days, 61% 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 2,096 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 994 | 0 |
| February | 829 | 0 |
| March | 760 | 0 |
| April | 585 | 0 |
| May | 357 | 6 |
| June | 157 | 40 |
| July | 27 | 161 |
| August | 33 | 119 |
| September | 169 | 27 |
| October | 498 | 1 |
| November | 803 | 0 |
| December | 1,031 | 0 |
| Year (annual) | 6,240 | 353 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00358173. 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.
Have recent years at Summer Lake (1 mi S) been warmer than normal?
2022 averaged 50.2°F, 1.4°F above the 1991-2020 normal of 48.8°F.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2022 | 50.2°F | +1.4°F | 11.09 | – |
Over 57 complete years from 1958 to 2023, the station's annual mean temperature rose at a fitted 1.6°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 USC00358173; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Summer Lake (1 mi S)'s climate compare?
Summer Lake (1 mi S) is warmer than 24 of the 105 places with their own NOAA record in Oregon, and wetter than 17. Across the 7,247 U.S. stations with normals, its annual mean of 48.8°F is warmer than 35%.
In the Köppen classification computed from these normals, Summer Lake (1 mi S) 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 Summer Lake (1 mi S)'s climate
What is the coldest month at Summer Lake (1 mi S)?
December, with a normal high of 43°F and a normal low of 21°F. The warmest is July (90°F by day, 49°F at night).
Does it snow at Summer Lake (1 mi S)?
Yes: 7 inches in a normal year, falling on 4 days with 0.1 inch or more, the most in December (2.5 inches).
What is the rainiest month at Summer Lake (1 mi S)?
December, with 1.85 in of precipitation in a normal year; the driest is July with 0.38 in.
What plant hardiness zone is Summer Lake (1 mi S) in?
The USDA's 2023 map puts Summer Lake (1 mi S) in zone 6a in ZIP code 97638, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 1°F (29 years, 1991-2020): zone 7a.
How late can frost come at Summer Lake (1 mi S)?
In half of years the last 32°F night comes after June 8; in one year in ten it comes after June 25. Waiting until June 25 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon climateThe statewide normals and every place in the state
- Silver Lake, OR18 miles from this station, 45.3°F a year
- Paisley, OR22 miles from this station, 47.8°F a year
- The Poplars, OR22 miles from this station, 44.9°F a year
- Alkali Lake, OR40 miles from this station, 46.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made