Climate Comfort Score
70/100
Good
NOAA 1991–2020 normals 75°F annual avg Public-domain federal data
Iron Mtn, CA Climate
Pulled from NOAA NCEI 1991–2020 normals →: average temperature, precipitation, and comfort score
- 75°F
- Avg annual temp
- 70/100
- Comfort score
- 362d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Iron Mtn
Iron Mtn, California averages 75°F a year and scores 70/100 on the comfort index - good, milder than 66% of U.S. cities.
- 75°F
- yearly average temperature, NOAA normal
- 70/100
- comfort score, milder than 66% of U.S. cities
- 362 days
- growing season, frost-free days
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
75°F (24°C)
Avg High
87°F
Avg Low
63°F
Annual Precip
N/A
Comfort Score
70/100
Good
Avg Annual Temperature
75°F
30-year mean (NOAA NCEI)
Annual Precipitation
N/A
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Iron Mtn) 70.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the Iron Mtn area.
How Iron Mtn compares to every U.S. city
Iron Mtn's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
70 Top 34% higher than 66% 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 Iron Mtn
MethodologySince 1900, U.S. land temperatures have tracked (and diverged from) the global mean - the chart below shows how. Iron Mtn's current NOAA 1991-2020 normal sits within that longer spread, and the most recent decade runs 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 | 66°F (19°C) | 46°F (8°C) | 56°F (13°C) | N/A | 0.4 | 0.0 |
| February | 71°F (22°C) | 49°F (9°C) | 60°F (15°C) | N/A | 0.1 | 0.0 |
| March | 78°F (26°C) | 54°F (12°C) | 66°F (19°C) | N/A | 0.1 | 3.0 |
| April | 85°F (30°C) | 60°F (16°C) | 73°F (23°C) | N/A | 0.0 | 11.6 |
| May | 95°F (35°C) | 69°F (21°C) | 82°F (28°C) | N/A | 0.0 | 23.7 |
| June | 104°F (40°C) | 77°F (25°C) | 91°F (33°C) | N/A | 0.0 | 29.3 |
| July | 109°F (43°C) | 83°F (29°C) | 96°F (36°C) | N/A | 0.0 | 30.9 |
| August | 108°F (42°C) | 82°F (28°C) | 95°F (35°C) | N/A | 0.0 | 30.8 |
| September | 102°F (39°C) | 75°F (24°C) | 89°F (31°C) | N/A | 0.0 | 28.6 |
| October | 89°F (32°C) | 64°F (18°C) | 76°F (25°C) | N/A | 0.0 | 17.5 |
| November | 75°F (24°C) | 52°F (11°C) | 64°F (18°C) | N/A | 0.2 | 1.0 |
| December | 64°F (18°C) | 45°F (7°C) | 55°F (13°C) | N/A | 0.4 | 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
December 31
50% probability date
Last Spring Freeze
January 3
50% probability date
Growing Season
362 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
966
Higher = more heating needed
Cooling Degree Days
4,712
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
What Iron Mtn's climate means for you
Iron Mtn runs 75°F a year - peaking in July, coldest in December.
- Gardeners get about 362 frost-free days, with the last spring freeze near January 3 - plan the planting calendar around it, not the regional average.
- Energy bills track 966 heating and 4,712 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: Iron Mtn, CA
Based on station USC00044297 feeding NOAA's 1991–2020 climate normals, Iron Mtn, California averages 75°F a year, ranging from a mean daily high of 87°F to a mean daily low of 63°F. July is typically the warmest month of the year, while December 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.
Anyone planning to live, garden, or travel in Iron Mtn should weigh precipitation alongside temperature: the annual average runs an uncharted amount, predominantly as rainfall. The frost-free season averages 362 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near January 3 and the first fall freeze near December 31. And on the energy front, 966 heating degree days and 4,712 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Iron Mtn scores 70/100 (Good), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above are the practical planning tool: mild highs and lows land in the shoulder seasons, July-driven heat peaks in summer, and December-driven cold sets in over deep winter. These are thirty-year averages, not a forecast - any single year can run warmer, wetter, drier, or cooler than the normal.
Frequently Asked Questions
What is the average temperature in Iron Mtn, CA? ▼
The average annual temperature in Iron Mtn, California is 75°F. The warmest month averages 109°F (43°C) and the coldest averages 45°F (7°C).
How much rain does Iron Mtn get? ▼
Iron Mtn receives an unknown amount of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Iron Mtn? ▼
Iron Mtn has a climate comfort score of 70/100 (Good), milder than 66% of U.S. cities in the PlainClimate database.
When is the growing season in Iron Mtn? ▼
Iron Mtn has approximately 362 frost-free days per year, with the last spring freeze around January 3 and the first fall freeze around December 31.
How much energy does heating and cooling require in Iron Mtn? ▼
Iron Mtn has 966 heating degree days and 4,712 cooling degree days annually, a cooling-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 Iron Mtn climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00044297 near Iron Mtn.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00044297. 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.