Climate Comfort Score
49/100
Moderate
NOAA 1991–2020 normals 51°F annual avg Public-domain federal data
Arrowrock Dam, ID Climate
Average temperature, precipitation, and a comfort score, drawn from NOAA NCEI 1991–2020 normals →
- 51°F
- Avg annual temp
- 49/100
- Comfort score
- 169d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Arrowrock Dam
Arrowrock Dam, Idaho averages 51°F a year and scores 49/100 on the comfort index - moderate, milder than 18% of U.S. cities.
- 51°F
- average temperature, NOAA 1991-2020 normal
- 49/100
- comfort score, milder than 18% of U.S. cities
- 169 days
- frost-free days per growing season
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
51°F (11°C)
Avg High
63°F
Avg Low
39°F
Annual Precip
N/A
Comfort Score
49/100
Moderate
Avg Annual Temperature
51°F
30-year mean (NOAA NCEI)
Annual Precipitation
N/A
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Arrowrock Dam) 49.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Moderate for the Arrowrock Dam area.
How Arrowrock Dam compares to every U.S. city
Arrowrock Dam's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
49 Top 82% higher than 18% of 6,915 US cities
Each bar is a band; taller bars hold more US cities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Warming context for Arrowrock Dam
MethodologyHow the U.S. land temperature anomaly tracks against the global mean since 1900. The current NOAA 1991-2020 normal for Arrowrock Dam captures average conditions across the spread shown, the most recent decade is warmer than the 30-year mean.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 37°F (3°C) | 22°F (-5°C) | 30°F (-1°C) | N/A | 28.7 | 0.0 |
| February | 43°F (6°C) | 25°F (-4°C) | 34°F (1°C) | N/A | 24.1 | 0.0 |
| March | 53°F (12°C) | 32°F (0°C) | 42°F (6°C) | N/A | 19.0 | 0.0 |
| April | 61°F (16°C) | 37°F (3°C) | 49°F (10°C) | N/A | 6.8 | 0.0 |
| May | 71°F (22°C) | 44°F (7°C) | 58°F (14°C) | N/A | 0.7 | 1.4 |
| June | 80°F (27°C) | 50°F (10°C) | 65°F (18°C) | N/A | 0.1 | 5.5 |
| July | 92°F (33°C) | 59°F (15°C) | 75°F (24°C) | N/A | 0.0 | 19.9 |
| August | 91°F (33°C) | 57°F (14°C) | 74°F (23°C) | N/A | 0.0 | 18.4 |
| September | 80°F (27°C) | 49°F (9°C) | 65°F (18°C) | N/A | 0.2 | 4.7 |
| October | 65°F (18°C) | 38°F (3°C) | 51°F (11°C) | N/A | 7.7 | 0.2 |
| November | 48°F (9°C) | 30°F (-1°C) | 39°F (4°C) | N/A | 20.2 | 0.0 |
| December | 37°F (3°C) | 24°F (-5°C) | 30°F (-1°C) | N/A | 27.0 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January N/A
February N/A
March N/A
April N/A
May N/A
June N/A
July N/A
August N/A
September N/A
October N/A
November N/A
December N/A
Frost Dates & Growing Season
First Fall Freeze
October 14
50% probability date
Last Spring Freeze
April 28
50% probability date
Growing Season
169 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,914
Higher = more heating needed
Cooling Degree Days
827
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Arrowrock Dam's climate means for you
Arrowrock Dam runs 51°F a year - peaking in July, coldest in January.
- Gardeners get about 169 frost-free days, with the last spring freeze near April 28 - plan the planting calendar around it, not the regional average.
- Energy bills track 5,914 heating and 827 cooling degree days a year, higher means the furnace or AC runs more.
- Comparing places to live? Line this city up against nearby cities and the national rankings. See rankings
These are 30-year NOAA normals (1991–2020) - the typical year, not a forecast for any specific season.
Climate Guides
Climate Insight: Arrowrock Dam, ID
Based on station USC00100448 feeding NOAA's 1991–2020 climate normals, Arrowrock Dam, Idaho averages 51°F a year, ranging from a mean daily high of 63°F to a mean daily low of 39°F. July is typically the warmest month of the year, while January is the coldest. Because these figures are thirty-year averages rather than any single year's readings, they describe the typical month, not a forecast for it.
Arrowrock Dam averages an uncharted amount of precipitation a year, predominantly as rainfall, and that matters as much to daily life here as temperature does. The frost-free season averages 169 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 28 and the first fall freeze near October 14. As for energy demand, 5,914 heating degree days and 827 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Arrowrock Dam scores 49/100 (Moderate), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Shoulder seasons bring the mildest highs and lows in the monthly tables above, summer brings July-driven heat, and winter brings January-driven cold - use that rhythm for planning. These figures are thirty-year averages rather than forecasts, so a specific year may still run warmer, cooler, wetter, or drier than what's shown.
Frequently Asked Questions
What is the average temperature in Arrowrock Dam, ID? ▼
The average annual temperature in Arrowrock Dam, Idaho is 51°F. The warmest month averages 92°F (33°C) and the coldest averages 22°F (-5°C).
How much rain does Arrowrock Dam get? ▼
Arrowrock Dam receives an unknown amount of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Arrowrock Dam? ▼
Arrowrock Dam has a climate comfort score of 49/100 (Moderate), milder than 18% of U.S. cities in the PlainClimate database.
When is the growing season in Arrowrock Dam? ▼
Arrowrock Dam has approximately 169 frost-free days per year, with the last spring freeze around April 28 and the first fall freeze around October 14.
How much energy does heating and cooling require in Arrowrock Dam? ▼
Arrowrock Dam has 5,914 heating degree days and 827 cooling degree days annually, a heating-dominated climate. See our <a href="/guides/reading-weather-data/" class="underline hover:text-brand-600">guide to reading weather data</a> for what these figures mean.
Where does this Arrowrock Dam climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00100448 near Arrowrock Dam.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00100448. For informational purposes only.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. This page draws directly on NOAA 1991-2020 U.S. Climate Normals data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.