Iron Mtn, CA Climate: Temperature by Month
Pulled from NOAA NCEI 1991–2020 normals →: climate measurements used in PlainClimate's documented score
30-year climate normals (1991-2020) from Iron Mtn's primary NOAA station, IRON MTN.
The climate verdict for Iron Mtn
Warm-season cooling demand defines Iron Mtn, California, running at more than twice its heating total. The NOAA normal records an annual average of 75°F. July is the warmest month at 96°F and December the coldest at 55°F.
- 75°F
- yearly average temperature, NOAA normal
- 362 days
- growing season, frost-free days
Iron Mtn: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00044297 · Iron Mtn, CA 75°F mean
TEMP-HOT · RANK-WARM · PHOTO-FINISH · PRCP-UNK · SWING-MID · COMF-UNK · LOAD-COOL · STN-1 · BOOK-PART
- TEMP-HOT 75°F
- RANK-WARM #6,792
- PHOTO-FINISH ≈ Phoenix
- PRCP-UNK Rain n/a
- SWING-MID 41°F
- COMF-UNK Comfort n/a
- LOAD-COOL 4,712 CDD
- STN-1 USC00044297
- BOOK-PART 4/6 fields
Nearest mean-temperature peer: Phoenix, AZ (+ 0.4 °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 CA station list.
- Hot Indio Fire, CA 76°F
- Near Phoenix, AZ 76°F
- Iron Mtn (this station) 75°F
- Near Gila Bend, AZ 75°F
- Cold Willow Beach, AZ 74°F
Climate Living Index · Iron Mtn
Iron Mtn: 63/100 · grade C
Iron Mtn publishes 3 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 3 missing weights rescale to 100.
PlainClimate-derived for Iron Mtn, not an official NOAA rating. Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Frost-free season | 362 days/year | 100/100 · A |
| Annual temperature balance | 75.2°F · 7.7° from 67.5°F | 76/100 · B |
| Normal heat + freeze calendar | 164 calendar days | 36/100 · F |
Iron Mtn · 2026-08-04 · NOAA NCEI Climate Normals · method .
National standing · cooling-led station
Where Iron Mtn sits across the climate record
Available NOAA 1991–2020 fields for Iron Mtn are ranked only against stations that publish the same field, missing metrics stay blank rather than estimated.
- Annual temperature
- Top 1% warmest
- Among 6,861 stations, Iron Mtn sits in the warmer third of annual means.
- Seasonal temperature swing
- 42nd percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
Iron Mtn's measured station temperature trend
MethodologyAcross 56 complete annual observations from 1937 to 2024, IRON MTN warmed at a fitted rate of 0.13°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Iron Mtn primary station fitted change +0.13 °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 | 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 |
The year, day by day
The year in Iron Mtn runs from a mild 44°F around December 18 to 109°F at the peak near July 18, and the normal low never reaches freezing on any date in the record.
When the heat sits
Normal highs reach 90°F from May 3 through October 13, covering 164 dates. The broader mild season, normal highs of 70°F or more, runs February 12 to November 26.
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.
No freezing date
Not one calendar date in the 1991–2020 record carries a normal low at or below 32°F. The coldest normal low of the year is 44°F around December 18.
The widest day
June 16 carries the biggest normal gap between afternoon and dawn, 27°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Iron Mtn.
Where Iron Mtn Stands Nationally
Summers here run among the most heat-heavy normals calendars in the country: on about 164 days a year the normal daily high itself reaches 90°F — a count fewer than one station in ten exceeds.
Iron Mtn earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall
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
Nationwide similar cities
Other rankable U.S. places outside CA closest to Iron Mtn 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 (75°F here).
- Marco Island, FL 75°F · 0.1°F off
- Stuart, FL 75°F · 0.1°F off
- Weslaco, TX 75°F · 0.2°F off
- Edinburg, TX 75°F · 0.3°F off
Data-derived climate profile
How Iron Mtn's climate pattern fits together
cooling led · mid swing
Air-conditioning demand is the clearest thermal signal here. Iron Mtn accumulates 4,712 cooling degree days, more than twice its 966 heating total; the monthly table shows when that imbalance builds rather than treating it as a year-round condition.
A moisture-range label is withheld because Iron Mtn's annual precipitation total is unavailable. Monthly source values remain visible where NOAA provides them, and no annual amount is reconstructed from incomplete data.
July and December mark the typical warm and cold ends of the calendar in Iron Mtn's middle-range seasonal profile. The measured spread is 41.4°F. The annual average is 75°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
With about 362 frost-free days, the calendar is constrained more by sustained heat than by freeze timing. This does not measure crop suitability or soil moisture; it only reports the NOAA-derived frost-free window for Iron Mtn.
These labels group NOAA 1991-2020 normals from Iron Mtn's primary station, so the summer figures are a thirty-year average rather than a ceiling: individual years have run hotter and will again. For Iron Mtn that means a descriptive range only — not an official NOAA classification and not a prediction for next summer.
Questions about Iron Mtn's climate
How many days above 90°F does Iron Mtn get? ▼
How much energy does heating and cooling require in Iron Mtn? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Iron Mtn's primary station: IRON MTN (USC00044297). 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 Iron Mtn; 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 Iron Mtn 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.