Sisters, OR Climate: Temperature & Rain by Month
Temperature and precipitation from NOAA NCEI 1991–2020 normals →, plus PlainClimate's derived comfort score
30-year climate normals (1991-2020) from Sisters's primary NOAA station, SISTERS.
The climate verdict for Sisters
Dryness leads the climate profile for Sisters, Oregon, with 15.2 inches of precipitation a year. NOAA records an annual average of 46°F. July is the warmest month at 65°F and December the coldest at 30°F.
- 46°F
- yearly average temperature, NOAA normal
- 15.2"
- yearly precipitation total
Sisters: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00357857 · Sisters, OR 46°F mean · 15.2" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-MID · COMF-UNK · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 46°F
- RANK-COOL #1,441
- PHOTO-FINISH ≈ Wickiup Dam
- PRCP-DRY 15.2"
- SWING-MID 35°F
- COMF-UNK Comfort n/a
- LOAD-HEAT 7,246 HDD
- STN-1 USC00357857
- BOOK-FULL 5/6 fields
Nearest mean-temperature peer: Wickiup Dam, OR (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every OR station list.
- Sisters (this station) 46°F
- Hot O O Rch, OR 46°F
- Near Wickiup Dam, OR 46°F
- Cold Snowball Rch, NV 45°F
- Near Placerville, CO 45°F
Climate Living Index · Sisters
Sisters: 17/100 · grade F
Sisters publishes 3 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 3 missing weights rescale to 100.
PlainClimate-derived for Sisters, not an official NOAA rating. Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 15.2 in · 19.8 from 35 in | 29/100 · F |
| Annual temperature balance | 45.5°F · 22.0° from 67.5°F | 21/100 · F |
| Normal heat + freeze calendar | 218 calendar days | 6/100 · F |
Sisters · 2026-08-04 · NOAA NCEI Climate Normals · method .
Sisters is a continental Köppen climate: Dsb
Coldest-month mean 29.6°F and warmest-month mean 64.5°F place this station in continental, dry-summer, warm summer climates (Dsb). Class Dsb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, dry-summer, warm summer.
- Köppen code
- Dsb
- Group
- Continental
- Warmest month
- 64.5°F
- Coldest month
- 29.6°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Sisters sits across the climate record
Three NOAA fields for Sisters's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 79%
- Among 6,861 stations, Sisters sits in the cooler third of annual means.
- Annual precipitation
- Drier than 82%
- Sisters's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 82%
- Warmest-to-coldest month gap for Sisters is compact versus 6,861 complete station-years.
Sisters's measured station temperature trend
MethodologyAcross 31 complete annual observations from 1959 to 2017, SISTERS warmed at a fitted rate of 0.11°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Sisters primary station fitted change +0.11 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 41°F (5°C) | 21°F (-6°C) | 31°F (-1°C) | 1.7" | 27.9 | 0.0 |
| February | 44°F (7°C) | 22°F (-6°C) | 33°F (0°C) | 1.4" | 25.2 | 0.0 |
| March | 51°F (10°C) | 25°F (-4°C) | 38°F (3°C) | 1.3" | 25.6 | 0.0 |
| April | 57°F (14°C) | 29°F (-2°C) | 43°F (6°C) | 0.8" | 21.4 | 0.0 |
| May | 66°F (19°C) | 34°F (1°C) | 50°F (10°C) | 1.5" | 11.9 | 0.2 |
| June | 74°F (23°C) | 39°F (4°C) | 57°F (14°C) | 1.0" | 5.3 | 1.8 |
| July | 86°F (30°C) | 43°F (6°C) | 65°F (18°C) | 0.6" | 1.1 | 11.5 |
| August | 85°F (29°C) | 42°F (6°C) | 64°F (18°C) | 0.6" | 1.5 | 9.4 |
| September | 76°F (24°C) | 36°F (2°C) | 56°F (13°C) | 0.5" | 8.7 | 2.2 |
| October | 61°F (16°C) | 29°F (-2°C) | 45°F (7°C) | 1.1" | 21.4 | 0.0 |
| November | 47°F (9°C) | 25°F (-4°C) | 36°F (2°C) | 2.2" | 23.8 | 0.0 |
| December | 39°F (4°C) | 20°F (-7°C) | 30°F (-1°C) | 2.5" | 28.0 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 88°F around July 25, short of 90°F on every date, while 218 dates carry a normal low at or below freezing, the coldest 19°F near December 21.
The freezing stretch
The normal low stays at or below 32°F into May 4, then returns to freezing around September 30, covering 218 dates in all.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
The widest day
July 29 carries the biggest normal gap between afternoon and dawn, 44°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Sisters.
Where Sisters Stands Nationally
Winters bite deep and often: the normal nightly low dips to freezing or below on around 218 nights a year, placing this among the most frost-prone tenth of ranked stations.
Day-to-night contrast is extreme by national standards — the widest normal daily swing reaches about 44°F, sharper than nine in ten ranked stations see.
Sisters earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall
Sisters's wet season runs through the cold months
December, January and February carry 37% of the year's precipitation here, while June through August contribute 14%. That is the cool-season-dominant pattern of the West Coast and the higher inland West, where storm tracks swing south in winter and summer turns dry; the thermometer meanwhile shows a 34.9°F seasonal spread.
- Wettest month
- December, 2.5"
- Driest month
- September, 0.5"
- Wettest three months
- December, November, January (42% of the year)
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A cool-season label means the December-February share reaches 35%. Where snow falls, the monthly figures above report liquid-equivalent precipitation, so a wet winter month is not necessarily a rainy one.
Frost Dates & Growing Season
First Fall Freeze
N/A
50% probability date
Last Spring Freeze
N/A
50% probability date
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
7,246
Higher = more heating needed
Cooling Degree Days
150
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside OR closest to Sisters on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (46°F here).
- Big Horn, WY 46°F · 0.0°F off
- Britt, IA 46°F · 0.0°F off
- Caledonia, MN 46°F · 0.0°F off
- Charlevoix, MI 46°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (15.2" here), excluding temperature-peer places.
- Winthrop, WA 15.2" · 0.0" off
- Longmont, CO 15.2" · 0.0" off
- White Signal, NM 15.2" · 0.0" off
- Conchas Dam, NM 15.2" · 0.0" off
Data-derived climate profile
How Sisters's climate pattern fits together
heating led · dry · mid swing
Sisters's energy balance leans toward cold weather: 7,246 annual heating degree days against 150 for cooling. Its 34.9°F seasonal range still makes the monthly rows more useful than the annual average alone.
A frost-free growing-season length is not available for Sisters. That missing field is kept separate from the observed temperature and precipitation record rather than filled from a regional estimate.
July and December mark the typical warm and cold ends of the calendar in Sisters's middle-range seasonal profile. The measured spread is 34.9°F. The annual average is 46°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Sisters's cold-season load does not imply a wet climate. Annual precipitation is 15.2 inches, which places the station in PlainClimate's dry range. Snowfall is not added to the interpretation because its annual value is missing. The snowfall and rainfall fields should be read separately rather than inferred from temperature.
These labels group NOAA 1991-2020 normals from Sisters's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for Sisters, not an official NOAA class or a year-ahead forecast.
Questions about Sisters's climate
How much rain does Sisters get? ▼
How cold does Sisters get in winter? ▼
How much energy does heating and cooling require in Sisters? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Sisters's primary station: SISTERS (USC00357857). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 4167950). Match rule for Sisters: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Sisters comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.