Massacre Rocks State Park, ID Climate: Temperature & Rain by Month
Pulled from NOAA NCEI 1991–2020 normals →: climate measurements used in PlainClimate's documented score
30-year climate normals (1991-2020) from Massacre Rocks State Park's primary NOAA station, MASSACRE ROCKS SP.
The climate verdict for Massacre Rocks State Park
Dryness leads the climate profile for Massacre Rocks State Park, Idaho, with 13.5 inches of precipitation a year. NOAA records an annual average of 47°F. At 52/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 24% of scores.
- 47°F
- average temperature, NOAA 1991-2020 normal
- 52/100
- comfort score, above 24% of station-mapped location scores
- 13.5"
- yearly precipitation total
- 129 days
- frost-free growing season
Massacre Rocks State Park: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00105678 · Massacre Rocks State Park, ID 47°F mean · 13.5" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-MID · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 47°F
- RANK-COOL #1,921
- PHOTO-FINISH ≈ Fulton Oswego C…
- PRCP-DRY 13.5"
- SWING-MID 45°F
- COMF-LOW 52/100
- LOAD-HEAT 6,900 HDD
- STN-1 USC00105678
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Fulton Oswego County, NY (+ 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 ID station list.
- Massacre Rocks… (this station) 47°F
- Cold Union City Filt…, PA 47°F
- Hot Allegan, MI 47°F
- Near Fulton Oswego C…, NY 47°F
- Near Barre Falls Dam, MA 47°F
Climate Living Index · Massacre Rocks State Park
Massacre Rocks State Park: 21/100 · grade F
Massacre Rocks State Park publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Massacre Rocks State Park, not an official NOAA rating. Rankings still use Comfort Score 52/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Annual temperature balance | 47.3°F · 20.2° from 67.5°F | 29/100 · F |
| Precipitation balance | 13.5 in · 21.5 from 35 in | 23/100 · F |
| Normal heat + freeze calendar | 197 calendar days | 16/100 · F |
| Frost-free season | 129 days/year | 11/100 · F |
Massacre Rocks State Park · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Massacre Rocks State Park is a continental Köppen climate: Dsb
Coldest-month mean 26.0°F and warmest-month mean 70.9°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
- 70.9°F
- Coldest month
- 26.0°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 Massacre Rocks State Park sits across the climate record
Three NOAA fields for Massacre Rocks State Park's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 72%
- Among 6,861 stations, Massacre Rocks State Park sits in the cooler third of annual means.
- Annual precipitation
- Drier than 86%
- Massacre Rocks State Park's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- 58th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Massacre Rocks State Park compares across U.S. station-mapped locations
Massacre Rocks State Park's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
52 24th percentile score exceeds 24% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). This entry sits in this band.
- 60–70: 1,236 station-mapped locations (20%). Above this entry.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 35°F (2°C) | 17°F (-8°C) | 26°F (-3°C) | 1.5" | 29.2 | 0.0 |
| February | 39°F (4°C) | 21°F (-6°C) | 30°F (-1°C) | 1.1" | 24.5 | 0.0 |
| March | 51°F (11°C) | 27°F (-3°C) | 39°F (4°C) | 1.3" | 22.8 | 0.0 |
| April | 59°F (15°C) | 33°F (0°C) | 46°F (8°C) | 1.6" | 13.0 | 0.0 |
| May | 68°F (20°C) | 39°F (4°C) | 54°F (12°C) | 1.6" | 3.7 | 0.9 |
| June | 78°F (26°C) | 46°F (8°C) | 62°F (17°C) | 1.0" | 0.3 | 5.8 |
| July | 89°F (32°C) | 53°F (12°C) | 71°F (22°C) | 0.5" | 0.0 | 19.4 |
| August | 88°F (31°C) | 52°F (11°C) | 70°F (21°C) | 0.6" | 0.1 | 17.9 |
| September | 77°F (25°C) | 43°F (6°C) | 60°F (16°C) | 0.9" | 1.7 | 4.8 |
| October | 62°F (17°C) | 34°F (1°C) | 48°F (9°C) | 1.1" | 13.2 | 0.2 |
| November | 47°F (8°C) | 24°F (-4°C) | 35°F (2°C) | 1.1" | 23.1 | 0.0 |
| December | 35°F (2°C) | 18°F (-8°C) | 26°F (-3°C) | 1.4" | 28.2 | 0.0 |
The year, day by day
Massacre Rocks State Park works both ends of the calendar. Normal highs climb to 91°F by July 26 and hold at or above 90°F on 23 dates, then normal lows drop to freezing or below on 174 dates, bottoming at 17°F around January 1.
When the heat sits
Normal highs reach 90°F from July 18 through August 9, covering 23 dates. The broader mild season, normal highs of 70°F or more, runs May 22 to September 30.
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 12, then returns to freezing around October 22, covering 174 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.
Where the wet dates fall
The likeliest wet date is May 17, when 34% of years recorded at least a hundredth of an inch. The driest is July 11 at 14%. Summed across the calendar, that is about 97 wet dates a year.
The widest day
July 21 carries the biggest normal gap between afternoon and dawn, 37°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Massacre Rocks State Park.
Where Massacre Rocks State Park Stands Nationally
Day-to-night contrast is extreme by national standards — the widest normal daily swing reaches about 37°F, sharper than nine in ten ranked stations see.
A drier-than-most normal water year — around 14 inches, below what four out of five ranked stations collect.
Massacre Rocks State Park earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall
10.0 days with precipitation
8.6 days with precipitation
8.6 days with precipitation
10.0 days with precipitation
10.7 days with precipitation
6.9 days with precipitation
4.3 days with precipitation
5.8 days with precipitation
5.7 days with precipitation
7.7 days with precipitation
8.4 days with precipitation
10.3 days with precipitation
Massacre Rocks State Park spreads its precipitation across the year
Neither half of the year dominates here: June through August take 15% of the annual total and December through February 29%, with neither reaching the 35% that would mark a distinct wet season. Massacre Rocks State Park has no dry season to plan around, though it does carry a 44.9°F seasonal spread.
The gap between the wettest and driest month still matters: April averages 1.6" and July 0.5". The three wettest months together take 35% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
Massacre Rocks State Park is dry, and what does fall arrives gently
Only about 97 days a year record measurable precipitation here, 27% of the calendar, and they carry 13.5" between them. At roughly 0.14 inches on an average wet day, this is not the damp drizzle of a marine climate; it is an arid record in which precipitation is both uncommon and light when it appears.
The wettest month by count is May at about 11 wet days; the driest is July at about 4.
A low per-event average in a dry record is a statement about typical days only. Arid regions can still take a large share of a year's total from a single convective storm, which a normal cannot show.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, not the extremes within it.
Frost Dates & Growing Season
First Fall Freeze
September 26
50% probability date
Last Spring Freeze
May 20
50% probability date
Growing Season
129 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,900
Higher = more heating needed
Cooling Degree Days
471
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside ID closest to Massacre Rocks State Park 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 (47°F here).
- Alton, UT 47°F · 0.0°F off
- Atkinson, NE 47°F · 0.0°F off
- Charlotte, MI 47°F · 0.0°F off
- Emmetsburg, IA 47°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (13.5" here), excluding temperature-peer places.
- San Jose, CA 13.5" · 0.0" off
- Ignacio, CO 13.5" · 0.0" off
- Anaheim, CA 13.5" · 0.0" off
- Dufur, OR 13.5" · 0.0" off
Scarce-water calendar
Where Massacre Rocks State Park's limited precipitation lands
heating led · dry · mid swing
Massacre Rocks State Park's energy balance leans toward cold weather: 6,900 annual heating degree days against 471 for cooling. Its 44.9°F seasonal range still makes the monthly rows more useful than the annual average alone.
Only about 129 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 January mark the typical warm and cold ends of the calendar in Massacre Rocks State Park's middle-range seasonal profile. The measured spread is 44.9°F. The annual average is 47°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Massacre Rocks State Park's cold-season load does not imply a wet climate. Annual precipitation is 13.5 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.
Massacre Rocks State Park wettest normal
April
April concentrates the scarce annual total (13.5 inches).
Massacre Rocks State Park driest normal
July
July is typically driest; arid stations are defined by when water is absent, not by a four-season grid.
Questions about Massacre Rocks State Park's climate
How dry is Massacre Rocks State Park? ▼
How many days above 90°F does Massacre Rocks State Park get? ▼
How much energy does heating and cooling require in Massacre Rocks State Park? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Massacre Rocks State Park's primary station: MASSACRE ROCKS SP (USC00105678). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for Massacre Rocks State Park; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for Massacre Rocks State Park 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.