Riverside, OR Climate: Temperature by Month
Average temperature and precipitation from NOAA NCEI 1991–2020 normals →, with a derived climate comfort score
30-year climate normals (1991-2020) from Riverside's primary NOAA station, RIVERSIDE 7 SSW.
The climate verdict for Riverside
Riverside, Oregon has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 49°F. July is the warmest month at 71°F and December the coldest at 30°F.
- 49°F
- average temperature, NOAA 1991-2020 normal
- 91 days
- frost-free days per growing season
Riverside: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00357208 · Riverside, OR 49°F mean
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-UNK · SWING-MID · COMF-UNK · LOAD-HEAT · STN-1 · BOOK-PART
- TEMP-COOL 49°F
- RANK-COOL #2,333
- PHOTO-FINISH ≈ Lybrook
- PRCP-UNK Rain n/a
- SWING-MID 41°F
- COMF-UNK Comfort n/a
- LOAD-HEAT 6,377 HDD
- STN-1 USC00357208
- BOOK-PART 4/6 fields
Nearest mean-temperature peer: Lybrook, NM (+ 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.
- Riverside (this station) 49°F
- Hot Lava Beds Nat M…, CA 49°F
- Near Lybrook, NM 49°F
- Near Frostburg, MD 49°F
- Near Hampton, CT 49°F
Climate Living Index · Riverside
Riverside: 14/100 · grade F
Riverside publishes 3 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 3 missing weights rescale to 100.
PlainClimate-derived for Riverside, not an official NOAA rating. Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Annual temperature balance | 48.5°F · 19.0° from 67.5°F | 34/100 · F |
| Frost-free season | 91 days/year | 0/100 · F |
| Normal heat + freeze calendar | 252 calendar days | 0/100 · F |
Riverside · 2026-08-04 · NOAA NCEI Climate Normals · method .
National standing · heating-led station
Where Riverside sits across the climate record
Available NOAA 1991–2020 fields for Riverside are ranked only against stations that publish the same field, missing metrics stay blank rather than estimated.
- Annual temperature
- 34th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Seasonal temperature swing
- 40th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 40°F (4°C) | 21°F (-6°C) | 31°F (-1°C) | N/A | 28.4 | 0.0 |
| February | 47°F (8°C) | 22°F (-5°C) | 34°F (1°C) | N/A | 25.5 | 0.0 |
| March | 57°F (14°C) | 27°F (-3°C) | 42°F (5°C) | N/A | 24.5 | 0.0 |
| April | 64°F (18°C) | 30°F (-1°C) | 47°F (8°C) | N/A | 18.6 | 0.0 |
| May | 73°F (23°C) | 37°F (3°C) | 55°F (13°C) | N/A | 9.8 | 1.3 |
| June | 82°F (28°C) | 43°F (6°C) | 62°F (17°C) | N/A | 2.7 | 6.1 |
| July | 93°F (34°C) | 49°F (9°C) | 71°F (22°C) | N/A | 0.2 | 22.0 |
| August | 91°F (33°C) | 45°F (7°C) | 68°F (20°C) | N/A | 1.4 | 18.3 |
| September | 82°F (28°C) | 37°F (3°C) | 59°F (15°C) | N/A | 11.2 | 6.4 |
| October | 67°F (19°C) | 29°F (-2°C) | 48°F (9°C) | N/A | 20.3 | 0.2 |
| November | 49°F (9°C) | 23°F (-5°C) | 36°F (2°C) | N/A | 24.6 | 0.0 |
| December | 39°F (4°C) | 20°F (-7°C) | 30°F (-1°C) | N/A | 27.9 | 0.0 |
The year, day by day
Riverside works both ends of the calendar. Normal highs climb to 95°F by July 25 and hold at or above 90°F on 45 dates, then normal lows drop to freezing or below on 207 dates, bottoming at 20°F around December 14.
When the heat sits
Normal highs reach 90°F from July 5 through August 18, covering 45 dates. The broader mild season, normal highs of 70°F or more, runs May 7 to October 10.
This counts calendar dates whose 1991–2020 normal high reaches 90°F. It is a smaller number than the 90°F+ day counts in the monthly table above, which measure how often the threshold was actually crossed in a typical year. A date can average 88°F and still exceed 90°F in half of all years.
The freezing stretch
The normal low stays at or below 32°F into April 26, then returns to freezing around October 3, covering 207 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
September 3 carries the biggest normal gap between afternoon and dawn, 45°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Riverside.
Where Riverside Stands Nationally
Winters bite deep and often: the normal nightly low dips to freezing or below on around 207 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 45°F, sharper than nine in ten ranked stations see.
Riverside earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall
Frost Dates & Growing Season
First Fall Freeze
September 6
50% probability date
Last Spring Freeze
June 7
50% probability date
Growing Season
91 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,377
Higher = more heating needed
Cooling Degree Days
403
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside OR closest to Riverside 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 (49°F here).
- Butler, PA 49°F · 0.0°F off
- Decorah, IA 49°F · 0.0°F off
- Fredericktown, OH 49°F · 0.0°F off
- Grosse Pointe Farms, MI 49°F · 0.0°F off
Data-derived climate profile
How Riverside's climate pattern fits together
heating led · mid swing
Riverside's energy balance leans toward cold weather: 6,377 annual heating degree days against 403 for cooling. Its 41.0°F seasonal range still makes the monthly rows more useful than the annual average alone.
Only about 91 days are frost-free in a normal year. That short interval is consistent with the cold-season signal, but the measure does not predict the exact first or last freeze in any one year.
July and December mark the typical warm and cold ends of the calendar in Riverside's middle-range seasonal profile. The measured spread is 41.0°F. The annual average is 49°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
A moisture-range label is withheld because Riverside's annual precipitation total is unavailable. Monthly source values remain visible where NOAA provides them, and no annual amount is reconstructed from incomplete data.
These labels group NOAA 1991-2020 normals from Riverside'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 Riverside, not an official NOAA class or a year-ahead forecast.
Questions about Riverside's climate
How many days above 90°F does Riverside get? ▼
How much energy does heating and cooling require in Riverside? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Riverside's primary station: RIVERSIDE 7 SSW (USC00357208). 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 a census-designated place (GEOID 4162412), not an incorporated municipality. Match rule for Riverside: 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 Riverside 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.