Green Valley, 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 Green Valley's primary NOAA station, GREEN VALLEY.
The climate verdict for Green Valley
Dryness leads the climate profile for Green Valley, Arizona, with 12.8 inches of precipitation a year. NOAA records an annual average of 68°F. It scores 87/100 for climate comfort (excellent), putting it in the top third of station-mapped location scores and exceeding 87% of them.
- 68°F
- annual average temperature (NOAA normal)
- 87/100
- comfort score, above 87% of station-mapped location scores
- 12.8"
- yearly precipitation total
- 275 days
- frost-free days per growing season
Green Valley: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00023668 · Green Valley, AZ 68°F mean · 12.8" precip
TEMP-MILD · RANK-WARM · PHOTO-FINISH · PRCP-DRY · SWING-MID · COMF-TOP · LOAD-MIX · STN-1 · BOOK-FULL
- TEMP-MILD 68°F
- RANK-WARM #6,381
- PHOTO-FINISH ≈ Austin Bergstrom
- PRCP-DRY 12.8"
- SWING-MID 34°F
- COMF-TOP 87/100
- LOAD-MIX H/C balanced
- STN-1 USC00023668
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Austin Bergstrom, 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.
- Green Valley (this station) 68°F
- Hot Sapelo Island, GA 68°F
- Near Austin Bergstrom, TX 68°F
- Near Gulfport Naval…, MS 68°F
- Near Marrero, LA 68°F
Climate Living Index · Green Valley
Green Valley: 69/100 · grade C
Green Valley publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Green Valley, not an official NOAA rating. Rankings still use Comfort Score 87/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Annual temperature balance | 68.4°F · 0.9° from 67.5°F | 96/100 · A |
| Frost-free season | 275 days/year | 96/100 · A |
| Snowfall burden | 0.1 inches/year | 89/100 · A |
| Normal heat + freeze calendar | 142 calendar days | 52/100 · D |
| Precipitation balance | 12.8 in · 22.1 from 35 in | 21/100 · F |
Green Valley · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Green Valley'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
- 85.4°F
- Coldest month
- 51.2°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 Green Valley sits across the climate record
Three NOAA fields for Green Valley's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Top 7% warmest
- Among 6,861 stations, Green Valley sits in the warmer third of annual means.
- Annual precipitation
- Drier than 88%
- Green Valley's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 84%
- Warmest-to-coldest month gap for Green Valley is compact versus 6,861 complete station-years.
How Green Valley compares across U.S. station-mapped locations
Green Valley's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
87 Top 13% score exceeds 87% 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%). This entry sits in this band.
- 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 | 67°F (19°C) | 36°F (2°C) | 52°F (11°C) | 0.8" | 0.0" | 7.4 | 0.0 |
| February | 69°F (21°C) | 39°F (4°C) | 54°F (12°C) | 0.9" | 0.0" | 4.4 | 0.0 |
| March | 76°F (24°C) | 44°F (7°C) | 60°F (16°C) | 0.6" | 0.1" | 0.6 | 1.2 |
| April | 82°F (28°C) | 50°F (10°C) | 66°F (19°C) | 0.3" | 0.0" | 0.0 | 5.6 |
| May | 91°F (33°C) | 58°F (15°C) | 75°F (24°C) | 0.2" | 0.0" | 0.0 | 19.3 |
| June | 100°F (38°C) | 68°F (20°C) | 84°F (29°C) | 0.4" | 0.0" | 0.0 | 29.3 |
| July | 99°F (37°C) | 72°F (22°C) | 85°F (30°C) | 2.9" | 0.0" | 0.0 | 28.6 |
| August | 97°F (36°C) | 71°F (22°C) | 84°F (29°C) | 2.7" | 0.0" | 0.0 | 28.9 |
| September | 94°F (35°C) | 66°F (19°C) | 80°F (27°C) | 1.7" | 0.0" | 0.0 | 25.7 |
| October | 87°F (30°C) | 54°F (12°C) | 70°F (21°C) | 0.8" | 0.0" | 0.0 | 11.6 |
| November | 76°F (24°C) | 43°F (6°C) | 60°F (15°C) | 0.5" | 0.0" | 1.8 | 0.9 |
| December | 66°F (19°C) | 36°F (2°C) | 51°F (11°C) | 1.1" | 0.0" | 9.4 | 0.0 |
The year, day by day
The year in Green Valley runs from a mild 35°F around December 24 to 101°F at the peak near June 22, and the normal low never reaches freezing on any date in the record.
When the heat sits
Normal highs reach 90°F from May 15 through October 3, covering 142 dates. The broader mild season, normal highs of 70°F or more, runs February 21 to November 28.
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 35°F around December 24.
Where the wet dates fall
The likeliest wet date is July 29, when 33% of years recorded at least a hundredth of an inch. The driest is April 29 at 4%. Summed across the calendar, that is about 51 wet dates a year.
The widest day
October 30 carries the biggest normal gap between afternoon and dawn, 34°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Green Valley.
Where Green Valley Stands Nationally
Summers here run among the most heat-heavy normals calendars in the country: on about 142 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 13 inches, below what four out of five ranked stations collect.
Green Valley 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
4.1 days with precipitation
4.4 days with precipitation
Snow: 0.1"
3.4 days with precipitation
1.6 days with precipitation
1.3 days with precipitation
1.7 days with precipitation
10.0 days with precipitation
9.7 days with precipitation
5.0 days with precipitation
3.3 days with precipitation
2.3 days with precipitation
4.2 days with precipitation
Green Valley runs a summer-peaked wet season
47% of Green Valley's yearly precipitation falls in June, July and August alone, against the 25% an evenly spread year would give those three months. The wettest month is July at 2.9", on a 34.2°F seasonal spread. Warm-season convection and, across the Southwest, the North American monsoon produce this shape: rain arrives in short heavy bursts during the hottest part of the year rather than as long cool-season soaking.
- Wettest three months: July, August, September, taking 56% of the annual total between them.
- Driest month: May at 0.2".
- Winter share: 22% falls in December, January and February.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A summer-peaked label means the June-August share reaches 35%; it describes timing across an average year, not any single season, and says nothing about how heavy an individual storm can be.
How Green Valley's precipitation splits across the calendar
About 51 days a year record measurable precipitation here, carrying 12.8" 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.
Snow reaches Green Valley, but rarely amounts to much
The normals record 0.1 inches of snow a year here, most likely in March. That is a real but marginal amount: enough that snow is part of the local record, not enough to define the winter.
A figure in this range usually reflects a handful of events that melt quickly rather than a season of accumulation; about 0 days a year record any measurable snow at all.
NOAA 1991-2020 normals. An average across thirty years can smooth away a single heavy winter, so a small annual figure does not mean a significant snowfall is impossible.
Frost Dates & Growing Season
First Fall Freeze
November 27
50% probability date
Last Spring Freeze
February 25
50% probability date
Growing Season
275 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
1,631
Higher = more heating needed
Cooling Degree Days
2,909
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside AZ closest to Green Valley 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 (68°F here).
- Marrero, LA 68°F · 0.0°F off
- Tallahassee, FL 68°F · 0.0°F off
- Trona, CA 68°F · 0.0°F off
- Biloxi, MS 69°F · 0.1°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (12.8" here), excluding temperature-peer places.
- Hope, NM 12.9" · 0.0" off
- Pioche, NV 12.9" · 0.0" off
- Pendleton, OR 12.8" · 0.0" off
- Redlands, CA 12.9" · 0.0" off
Scarce-water calendar
Where Green Valley's limited precipitation lands
mixed demand · dry · mid swing
Local precipitation is sparse in this otherwise mixed profile. The station reports 12.8 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 Green Valley's middle-range seasonal profile. The measured spread is 34.2°F. The annual average is 68°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Heating and cooling both register in Green Valley's normal, at 1,631 and 2,909 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.
Green Valley has a long frost-free window of roughly 275 days, but the dry annual profile is a separate constraint. Growing-season length says when freezes are unlikely, not whether rainfall is sufficient.
Green Valley wettest normal
July
July concentrates the scarce annual total (12.8 inches).
Green Valley driest normal
May
May is typically driest; arid stations are defined by when water is absent, not by a four-season grid.
Questions about Green Valley's climate
How dry is Green Valley? ▼
How many days above 90°F does Green Valley get? ▼
How much energy does heating and cooling require in Green Valley? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Green Valley's primary station: GREEN VALLEY (USC00023668). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as a census-designated place (GEOID 0429710), not an incorporated municipality. Match rule for Green Valley: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Green Valley 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.