Mormon Flat, AZ Climate: Temperature & Rain by Month
Temperature and precipitation from NOAA NCEI 1991–2020 normals →, plus PlainClimate's derived comfort score
30-year climate normals (1991-2020) from Mormon Flat's primary NOAA station, MORMON FLAT.
The climate verdict for Mormon Flat
Mormon Flat, Arizona is cooling-led and dry. Its 12.0 inches of annual precipitation pairs with an annual average of 73°F. It scores 90/100 for climate comfort (excellent), putting it in the top third of station-mapped location scores and exceeding 91% of them.
- 73°F
- yearly average temperature, NOAA normal
- 90/100
- comfort score, above 91% of station-mapped location scores
- 12.0"
- annual precipitation
- 329 days
- frost-free days per growing season
Mormon Flat: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00025700 · Mormon Flat, AZ 73°F mean · 12.0" precip
TEMP-HOT · RANK-WARM · PHOTO-FINISH · PRCP-DRY · SWING-MID · COMF-TOP · LOAD-COOL · STN-1 · BOOK-FULL
- TEMP-HOT 73°F
- RANK-WARM #6,655
- PHOTO-FINISH ≈ Litchfield Park
- PRCP-DRY 12.0"
- SWING-MID 38°F
- COMF-TOP 90/100
- LOAD-COOL 4,126 CDD
- STN-1 USC00025700
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Litchfield Park, AZ (+ 0.1 °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 AZ station list.
- Hot Eagle Mtn, CA 74°F
- Near Ajo, AZ 74°F
- Mormon Flat (this station) 73°F
- Cold Tacna, AZ 73°F
- Near Litchfield Park, AZ 73°F
Climate Living Index · Mormon Flat
Mormon Flat: 61/100 · grade C
Mormon Flat publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Mormon Flat, not an official NOAA rating. Rankings still use Comfort Score 90/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Frost-free season | 329 days/year | 100/100 · A |
| Snowfall burden | 0.0 inches/year | 90/100 · A |
| Annual temperature balance | 73.2°F · 5.7° from 67.5°F | 82/100 · B |
| Normal heat + freeze calendar | 161 calendar days | 39/100 · F |
| Precipitation balance | 12.0 in · 23.0 from 35 in | 18/100 · F |
Mormon Flat · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Mormon Flat's normals sit in a dry climate class: BSh
Precipitation is low relative to temperature but above true desert thresholds: hot semi-arid steppe (BSh). Class BSh is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: dry (arid or semi-arid), specifically hot semi-arid steppe.
- Köppen code
- BSh
- Group
- Dry (arid or semi-arid)
- Warmest month
- 92.8°F
- Coldest month
- 54.6°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 · cooling-led station
Where Mormon Flat sits across the climate record
Three NOAA fields for Mormon Flat's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Top 3% warmest
- Among 6,861 stations, Mormon Flat sits in the warmer third of annual means.
- Annual precipitation
- Drier than 90%
- Mormon Flat's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 72%
- Warmest-to-coldest month gap for Mormon Flat is compact versus 6,861 complete station-years.
How Mormon Flat compares across U.S. station-mapped locations
Mormon Flat's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
90 Top 9% score exceeds 91% 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%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). Below this entry.
- 70–80: 650 station-mapped locations (11%). Below this entry.
- 80–90: 921 station-mapped locations (15%). Below this entry.
- 90–100: 564 station-mapped locations (9%). This entry sits in this band.
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 | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 68°F (20°C) | 44°F (7°C) | 56°F (13°C) | 1.9" | 0.0" | 1.4 | 0.0 |
| February | 70°F (21°C) | 45°F (7°C) | 58°F (14°C) | 1.5" | 0.0" | 0.5 | 0.0 |
| March | 77°F (25°C) | 50°F (10°C) | 64°F (18°C) | 1.7" | 0.0" | 0.0 | 1.1 |
| April | 85°F (30°C) | 55°F (13°C) | 70°F (21°C) | 0.5" | 0.0" | 0.0 | 8.8 |
| May | 94°F (34°C) | 64°F (18°C) | 79°F (26°C) | 0.3" | 0.0" | 0.0 | 22.8 |
| June | 104°F (40°C) | 73°F (23°C) | 88°F (31°C) | 0.0" | 0.0" | 0.0 | 29.7 |
| July | 106°F (41°C) | 80°F (27°C) | 93°F (34°C) | 1.3" | 0.0" | 0.0 | 30.8 |
| August | 104°F (40°C) | 79°F (26°C) | 91°F (33°C) | 1.4" | 0.0" | 0.0 | 30.4 |
| September | 98°F (37°C) | 74°F (23°C) | 86°F (30°C) | 0.5" | 0.0" | 0.0 | 28.1 |
| October | 89°F (32°C) | 63°F (17°C) | 76°F (24°C) | 0.7" | 0.0" | 0.0 | 16.5 |
| November | 75°F (24°C) | 52°F (11°C) | 63°F (17°C) | 0.4" | 0.0" | 0.2 | 1.7 |
| December | 65°F (18°C) | 44°F (7°C) | 55°F (13°C) | 1.7" | 0.0" | 1.1 | 0.0 |
The year, day by day
The year in Mormon Flat runs from a mild 43°F around December 19 to 106°F at the peak near July 2, and the normal low never reaches freezing on any date in the record.
When the heat sits
Normal highs reach 90°F from May 6 through October 13, covering 161 dates. The broader mild season, normal highs of 70°F or more, runs February 16 to November 24.
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 43°F around December 19.
Where the wet dates fall
The likeliest wet date is February 11, when 19% of years recorded at least a hundredth of an inch. The driest is June 13 at 2%. Summed across the calendar, that is about 38 wet dates a year.
The widest day
June 6 carries the biggest normal gap between afternoon and dawn, 31°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Mormon Flat.
Where Mormon Flat Stands Nationally
Summers here run among the most heat-heavy normals calendars in the country: on about 161 days a year the normal daily high itself reaches 90°F — a count fewer than one station in ten exceeds.
A drier-than-most normal water year — around 12 inches, below what four out of five ranked stations collect.
Mormon Flat earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall and snowfall
5.4 days with precipitation
4.8 days with precipitation
4.6 days with precipitation
1.5 days with precipitation
1.7 days with precipitation
0.5 days with precipitation
3.7 days with precipitation
5.0 days with precipitation
2.9 days with precipitation
2.5 days with precipitation
1.7 days with precipitation
3.9 days with precipitation
Mormon Flat's wet season runs through the cold months
December, January and February carry 43% of the year's precipitation here, while June through August contribute 23%. That is the cool-season-dominant pattern of the West Coast and the higher inland West, where storm tracks swing south in winter and summer turns dry; the thermometer meanwhile shows a 38.2°F seasonal spread.
- Wettest month
- January, 1.9"
- Driest month
- June, 0.0"
- Wettest three months
- January, March, December (45% of the year)
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A cool-season label means the December-February share reaches 35%. Where snow falls, the monthly figures above report liquid-equivalent precipitation, so a wet winter month is not necessarily a rainy one.
How Mormon Flat's precipitation splits across the calendar
About 38 days a year record measurable precipitation here, carrying 12.0" between them, or roughly 0.31 inches on a typical wet day. That sits in the middle band: neither the many-light-days pattern of the Pacific Northwest and the Great Lakes, nor the few-heavy-events pattern of the Gulf and the desert Southwest.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
Mormon Flat's record shows no measurable snowfall
This station measured snowfall across the 1991-2020 period and recorded none: the annual normal is 0.0 inches. That is a measured zero rather than missing data, which is a meaningful distinction here , most stations in the database simply do not report snow at all, and those pages say nothing about it.
A thirty-year normal of zero describes the typical year at this station. It is not a claim that snow has never fallen in the area.
Frost Dates & Growing Season
First Fall Freeze
December 24
50% probability date
Last Spring Freeze
January 29
50% probability date
Growing Season
329 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
1,104
Higher = more heating needed
Cooling Degree Days
4,126
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside AZ closest to Mormon Flat 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 (73°F here).
- Kingsville, TX 73°F · 0.1°F off
- Bartow, FL 73°F · 0.1°F off
- Melbourne, FL 73°F · 0.1°F off
- Robstown, TX 73°F · 0.1°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (12.0" here), excluding temperature-peer places.
- Kremmling, CO 12.0" · 0.0" off
- Camarillo, CA 12.0" · 0.0" off
- Long Beach, CA 12.0" · 0.0" off
- Chelan, WA 12.0" · 0.0" off
Scarce-water calendar
Where Mormon Flat's limited precipitation lands
cooling led · dry · mid swing
Air-conditioning demand is the clearest thermal signal here. Mormon Flat accumulates 4,126 cooling degree days, more than twice its 1,104 heating total; the monthly table shows when that imbalance builds rather than treating it as a year-round condition.
Heat demand sits beside limited local precipitation: Mormon Flat receives 12.0 inches in a normal year, inside PlainClimate's dry range. Recorded annual snowfall is negligible. Month-level precipitation is the useful check on when that small annual total arrives.
July and December mark the typical warm and cold ends of the calendar in Mormon Flat's middle-range seasonal profile. The measured spread is 38.2°F. The annual average is 73°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Mormon Flat has a long frost-free window of roughly 329 days, but the dry annual profile is a separate constraint. Growing-season length says when freezes are unlikely, not whether rainfall is sufficient.
Mormon Flat wettest normal
January
January concentrates the scarce annual total (12.0 inches).
Mormon Flat driest normal
June
June is typically driest; arid stations are defined by when water is absent, not by a four-season grid.
Questions about Mormon Flat's climate
How dry is Mormon Flat? ▼
How many days above 90°F does Mormon Flat get? ▼
How much energy does heating and cooling require in Mormon Flat? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Mormon Flat's primary station: MORMON FLAT (USC00025700). 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 Mormon Flat; 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 Mormon Flat 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.