Alamo Dam, AZ Climate: Temperature & Rain by Month
Explore NOAA NCEI's 1991–2020 climate normals → and a clearly labeled PlainClimate comfort calculation
30-year climate normals (1991-2020) from Alamo Dam's primary NOAA station, ALAMO DAM.
The climate verdict for Alamo Dam
Dryness leads the climate profile for Alamo Dam, Arizona, with 7.8 inches of precipitation a year. NOAA records an annual average of 69°F. It scores 77/100 for climate comfort (good), putting it in the top third of station-mapped location scores and exceeding 70% of them.
- 69°F
- annual average temperature (NOAA normal)
- 77/100
- comfort score, above 70% of station-mapped location scores
- 7.8"
- precipitation, annual total
- 264 days
- frost-free growing season
Alamo Dam: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00020100 · Alamo Dam, AZ 69°F mean · 7.8" precip
TEMP-MILD · RANK-WARM · PHOTO-FINISH · PRCP-ARID · SWING-MID · COMF-TOP · LOAD-MIX · STN-1 · BOOK-FULL
- TEMP-MILD 69°F
- RANK-WARM #6,449
- PHOTO-FINISH ≈ Brackettville
- PRCP-ARID 7.8"
- SWING-MID 43°F
- COMF-TOP 77/100
- LOAD-MIX H/C balanced
- STN-1 USC00020100
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Brackettville, TX (+ 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 AZ station list.
- Alamo Dam (this station) 69°F
- Hot Orange Springs, FL 69°F
- Near Brackettville, TX 69°F
- Near Lake Arthur, LA 69°F
- Near Matagorda NO, TX 69°F
Climate Living Index · Alamo Dam
Alamo Dam: 54/100 · grade D
Alamo Dam publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Alamo Dam, not an official NOAA rating. Rankings still use Comfort Score 77/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Annual temperature balance | 69.0°F · 1.5° from 67.5°F | 94/100 · A |
| Frost-free season | 264 days/year | 93/100 · A |
| Snowfall burden | 0.0 inches/year | 90/100 · A |
| Normal heat + freeze calendar | 205 calendar days | 11/100 · F |
| Precipitation balance | 7.8 in · 27.2 from 35 in | 7/100 · F |
Alamo Dam · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Alamo Dam's normals sit in a dry climate class: BWh
Annual precipitation falls well below the aridity threshold for this temperature regime, so the normals classify as hot desert (BWh). Class BWh is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: dry (arid or semi-arid), specifically hot desert.
- Köppen code
- BWh
- Group
- Dry (arid or semi-arid)
- Warmest month
- 90.8°F
- Coldest month
- 48.0°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 · balanced station
Where Alamo Dam sits across the climate record
Three NOAA fields for Alamo Dam's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Top 6% warmest
- Among 6,861 stations, Alamo Dam sits in the warmer third of annual means.
- Annual precipitation
- Drier than 97%
- Alamo Dam's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- 48th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Alamo Dam compares across U.S. station-mapped locations
Alamo Dam's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
77 Top 30% score exceeds 70% 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%). This entry sits in this band.
- 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 | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 66°F (19°C) | 32°F (0°C) | 49°F (9°C) | 1.0" | 0.0" | 9.4 | 0.0 |
| February | 70°F (21°C) | 36°F (2°C) | 53°F (12°C) | 1.1" | 0.0" | 4.1 | 0.0 |
| March | 77°F (25°C) | 41°F (5°C) | 59°F (15°C) | 0.8" | 0.0" | 0.5 | 3.0 |
| April | 85°F (29°C) | 48°F (9°C) | 67°F (19°C) | 0.2" | 0.0" | 0.0 | 11.6 |
| May | 94°F (35°C) | 57°F (14°C) | 76°F (24°C) | 0.1" | 0.0" | 0.0 | 24.3 |
| June | 105°F (40°C) | 65°F (18°C) | 85°F (29°C) | 0.1" | 0.0" | 0.0 | 29.3 |
| July | 108°F (42°C) | 74°F (23°C) | 91°F (33°C) | 0.8" | 0.0" | 0.0 | 30.8 |
| August | 107°F (42°C) | 73°F (23°C) | 90°F (32°C) | 1.2" | 0.0" | 0.0 | 30.7 |
| September | 101°F (39°C) | 64°F (18°C) | 83°F (28°C) | 0.7" | 0.0" | 0.0 | 29.1 |
| October | 90°F (32°C) | 51°F (11°C) | 71°F (21°C) | 0.6" | 0.0" | 0.1 | 18.4 |
| November | 76°F (24°C) | 40°F (4°C) | 58°F (14°C) | 0.6" | 0.0" | 1.8 | 1.6 |
| December | 65°F (18°C) | 31°F (0°C) | 48°F (9°C) | 0.7" | 0.0" | 11.7 | 0.0 |
The year, day by day
Alamo Dam works both ends of the calendar. Normal highs climb to 108°F by July 10 and hold at or above 90°F on 164 dates, then normal lows drop to freezing or below on 41 dates, bottoming at 31°F around December 21.
When the heat sits
Normal highs reach 90°F from May 5 through October 15, covering 164 dates. The broader mild season, normal highs of 70°F or more, runs February 15 to November 27.
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 January 18, then returns to freezing around December 9, covering 41 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 August 19, when 16% of years recorded at least a hundredth of an inch. The driest is June 4 at 1%. Summed across the calendar, that is about 32 wet dates a year.
The widest day
June 10 carries the biggest normal gap between afternoon and dawn, 40°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Alamo Dam.
Where Alamo Dam 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.
Aridity defines the water calendar: about 8 inches in a normal year lands this among the driest tenth of ranked stations.
Alamo Dam 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
4.0 days with precipitation
4.2 days with precipitation
3.4 days with precipitation
1.5 days with precipitation
0.7 days with precipitation
0.3 days with precipitation
2.9 days with precipitation
4.9 days with precipitation
2.5 days with precipitation
2.0 days with precipitation
1.8 days with precipitation
3.2 days with precipitation
Alamo Dam's wet season runs through the cold months
December, January and February carry 36% of the year's precipitation here, while June through August contribute 26%. 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 42.8°F seasonal spread.
- Wettest month
- August, 1.2"
- Driest month
- June, 0.1"
- Wettest three months
- August, February, January (43% 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 Alamo Dam's precipitation splits across the calendar
About 31 days a year record measurable precipitation here, carrying 7.8" between them, or roughly 0.25 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.
Alamo Dam'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
November 23
50% probability date
Last Spring Freeze
March 4
50% probability date
Growing Season
264 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
1,902
Higher = more heating needed
Cooling Degree Days
3,378
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside AZ closest to Alamo Dam 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 (69°F here).
- Brackettville, TX 69°F · 0.0°F off
- Lake Arthur, LA 69°F · 0.0°F off
- Apalachicola, FL 69°F · 0.1°F off
- Cross City, FL 69°F · 0.1°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (7.8" here), excluding temperature-peer places.
- Wapato, WA 7.8" · 0.0" off
- Farson, WY 7.8" · 0.0" off
- Rachel, NV 7.8" · 0.0" off
- Searchlight, NV 7.8" · 0.0" off
Scarce-water calendar
Where Alamo Dam's limited precipitation lands
mixed demand · dry · mid swing
Local precipitation is sparse in this otherwise mixed profile. The station reports 7.8 inches annually, within PlainClimate's dry band. Recorded annual snowfall is negligible. The monthly distribution matters because the total alone does not reveal the timing.
July and December mark the typical warm and cold ends of the calendar in Alamo Dam's middle-range seasonal profile. The measured spread is 42.8°F. The annual average is 69°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Heating and cooling both register in Alamo Dam's normal, at 1,902 and 3,378 degree days respectively. Neither total exceeds the other by more than two to one, so the record is better read as a mixed-demand calendar than as heating-led or cooling-led.
Alamo Dam has a long frost-free window of roughly 264 days, but the dry annual profile is a separate constraint. Growing-season length says when freezes are unlikely, not whether rainfall is sufficient.
Alamo Dam wettest normal
August
August concentrates the scarce annual total (7.8 inches).
Alamo Dam driest normal
June
June is typically driest; arid stations are defined by when water is absent, not by a four-season grid.
Questions about Alamo Dam's climate
How dry is Alamo Dam? ▼
How many days above 90°F does Alamo Dam get? ▼
How much energy does heating and cooling require in Alamo Dam? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Alamo Dam's primary station: ALAMO DAM (USC00020100). 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 Alamo Dam; 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 Alamo Dam 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.