Climate and average weather in San Tan Valley
In San Tan Valley, the summers are sweltering, fairly dry, and mostly clear and the winters are mild and mostly clear.
Over the course of the year, the temperature in San Tan Valley typically varies from 43°F to 103°F, and is rarely below 34°F or above 109°F. July is the hottest month of the year, while December is the coldest.
Based on the travel score, the best times of year to visit San Tan Valley for warm-weather activities are from early January to late April and late October to mid December.
- Hottest
- Jul
- 103°
- Coldest
- Dec
- 43°
- Wettest
- Feb
- 1.6 in
- Driest
- Jun
- 0.1 in
- Rain / yr
- 10.5 in
- 35 wet days
- Daylight
- 9.8–14.2 h
- shortest–longest
- Elevation
- 1,516 ft
- 33.2°N
- Clearest
- Jun
- 14% cloud
San Tan Valley is unincorporated community in Pinal County, Arizona, United States of America.
- Founded
- 2009
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
San Tan Valley weather by month, at a glance
The whole year in one picture — sky, rain, humidity, temperature and travel score. Click any band to jump to its full chart.
Each stripe is one measure across the whole year, stacked so a single day reads top to bottom. The sky band runs overcast grey on top down to clear blue at the base — more blue means sunnier — followed by the rainfall curve, the humidity band, a temperature strip that tints each stretch of the year by how warm its average high is, and the travel-score line at the foot. Scan straight down any date to read that day across every measure at once; the score climbs highest around early January to late April.
Temperature through the year
Daily average highs and lows in San Tan Valley, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 4.2 months, from May 24 to September 28, with daily high temperatures above 94°F. The hottest month of the year in San Tan Valley is July, with an average high of 103°F and low of 81°F.
The cool season lasts 3.3 months, from November 24 to March 2, with daily high temperatures below 71°F. The coldest month of the year in San Tan Valley is December, with an average low of 43°F and high of 65°F.
Days typically run about 24°F warmer than nights, with the widest day–night swing (around 27°F) in June.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 65 | 69 | 75 | 83 | 92 | 101 | 103 | 101 | 97 | 87 | 74 | 65 |
| Avg low (°F) | 43 | 46 | 50 | 56 | 65 | 74 | 81 | 80 | 74 | 62 | 51 | 43 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| Jan | 65 | 43 |
| Feb | 69 | 46 |
| Mar | 75 | 50 |
| Apr | 83 | 56 |
| May | 92 | 65 |
| Jun | 101 | 74 |
| Jul | 103 | 81 |
| Aug | 101 | 80 |
| Sep | 97 | 74 |
| Oct | 87 | 62 |
| Nov | 74 | 51 |
| Dec | 65 | 43 |
How hot and cold San Tan Valley really feels
The felt-temperature range through the year — heat index on the day's high (summer humidity), wind chill on the night's low (winter wind). The dashed lines are the plain thermometer; the gap is how much hotter or colder it really feels.
On the hottest afternoons, once humidity is folded in, San Tan Valley feels like about 104°F (around June 28). About 155 days a year carry some heat stress, and 54 of them tip into dangerous heat (feels-like above 102°F), peaking in June.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°F) | 65 | 69 | 75 | 83 | 92 | 101 | 103 | 102 | 97 | 87 | 74 | 65 |
| Air high (°F) | 65 | 69 | 75 | 83 | 92 | 101 | 103 | 101 | 97 | 87 | 74 | 65 |
| Feels-like low (°F) | 39 | 43 | 49 | 56 | 65 | 74 | 81 | 80 | 74 | 62 | 50 | 40 |
| Air low (°F) | 43 | 46 | 50 | 56 | 65 | 74 | 81 | 80 | 74 | 62 | 51 | 43 |
| Feels-like high (°F) | Air high (°F) | Feels-like low (°F) | Air low (°F) | |
|---|---|---|---|---|
| Jan | 65 | 65 | 39 | 43 |
| Feb | 69 | 69 | 43 | 46 |
| Mar | 75 | 75 | 49 | 50 |
| Apr | 83 | 83 | 56 | 56 |
| May | 92 | 92 | 65 | 65 |
| Jun | 101 | 101 | 74 | 74 |
| Jul | 103 | 103 | 81 | 81 |
| Aug | 102 | 101 | 80 | 80 |
| Sep | 97 | 97 | 74 | 74 |
| Oct | 87 | 87 | 62 | 62 |
| Nov | 74 | 74 | 50 | 51 |
| Dec | 65 | 65 | 40 | 43 |
Average hourly temperature in San Tan Valley
A compact picture of the whole year, hour by hour: each column is a day, each row an hour, and the color is the modeled average temperature. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
Read left to right for the day of the year and top to bottom for the hour of the day; the color is the modeled temperature, cool blues through to hot reds on the same scale as the other charts. A vertical slice is a single day's swing — coolest just before dawn, warmest in the mid-afternoon — while a horizontal slice follows one hour across the seasons. The darker overlay marks night and the lighter one the twilight around sunrise and sunset. Colors run warmest on July afternoons, near 103°F, and coldest before dawn in December, near 43°F.
San Tan Valley weather by month
Every month at a glance. Click a month for its detailed page.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 65° / 43° | 1.5 | 4.2 | 10.1 | 7.2 |
| Feb | 69° / 46° | 1.6 | 4.4 | 10.8 | 7.5 |
| Mar | 75° / 50° | 1.1 | 3 | 11.7 | 8.4 |
| Apr | 83° / 56° | 0.3 | 1.4 | 12.8 | 7.5 |
| May | 92° / 65° | 0.2 | 0.7 | 13.7 | 4.4 |
| Jun | 101° / 74° | 0.1 | 0.6 | 14.2 | 1.0 |
| Jul | 103° / 81° | 0.8 | 3.8 | 14 | 0.3 |
| Aug | 101° / 80° | 1.1 | 4.9 | 13.2 | 0.8 |
| Sep | 97° / 74° | 1.0 | 3.2 | 12.2 | 2.5 |
| Oct | 87° / 62° | 0.7 | 2.4 | 11.2 | 6.3 |
| Nov | 74° / 51° | 0.7 | 2.5 | 10.3 | 8.5 |
| Dec | 65° / 43° | 1.3 | 4.3 | 9.8 | 7.0 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
San Tan Valley gets about 10.5 in of precipitation a year. On a typical day the chance of rain is mostly dry, but that rises and falls sharply with the seasons.
The wetter season lasts 3.7 months, from around Nov 26 to Mar 17, peaking in February at about 16% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Jun 3.
February is the wettest month by volume, with 1.6 in over about 4 wet days; June is the driest, with 0.1 in.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 14 | 15 | 10 | 5 | 2 | 3 | 12 | 16 | 11 | 7 | 8 | 14 |
| Rain days | 4 | 4 | 3 | 1 | 1 | 1 | 4 | 5 | 3 | 2 | 3 | 4 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 14 | 4 |
| Feb | 15 | 4 |
| Mar | 10 | 3 |
| Apr | 5 | 1 |
| May | 2 | 1 |
| Jun | 3 | 1 |
| Jul | 12 | 4 |
| Aug | 16 | 5 |
| Sep | 11 | 3 |
| Oct | 7 | 2 |
| Nov | 8 | 3 |
| Dec | 14 | 4 |
Monthly rainfall
Over a full year, San Tan Valley collects about 10.5 in of rain across 35 wet days — roughly 0.9 in in an average month.
It doesn’t fall evenly. February is the wettest month with 1.6 in, while June is the driest at just 0.1 in. The three wettest months alone bring about 43% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (in) | 1.5 | 1.6 | 1.1 | 0.3 | 0.2 | 0.1 | 0.8 | 1.1 | 1.0 | 0.7 | 0.7 | 1.3 |
| Rain days | 4 | 4 | 3 | 1 | 1 | 1 | 4 | 5 | 3 | 2 | 3 | 4 |
| Rainfall (in) | Rain days | |
|---|---|---|
| Jan | 1.5 | 4 |
| Feb | 1.6 | 4 |
| Mar | 1.1 | 3 |
| Apr | 0.3 | 1 |
| May | 0.2 | 1 |
| Jun | 0.1 | 1 |
| Jul | 0.8 | 4 |
| Aug | 1.1 | 5 |
| Sep | 1.0 | 3 |
| Oct | 0.7 | 2 |
| Nov | 0.7 | 3 |
| Dec | 1.3 | 4 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In San Tan Valley, the average share of the sky covered by clouds shows significant seasonal variation over the course of the year.
The clearer part of the year begins around April 9 and lasts for 3.1 months, ending around July 11. The clearest month is June, when the sky is clear, mostly clear, or partly cloudy 93% of the time on average.
The cloudier part of the year begins around November 14 and lasts for 4.8 months, ending around April 8. The cloudiest month is February, when it is overcast or mostly cloudy 33% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 71 | 67 | 73 | 82 | 87 | 93 | 80 | 82 | 89 | 87 | 79 | 70 |
| Cloudier (%) | 29 | 33 | 27 | 18 | 13 | 7 | 20 | 18 | 11 | 13 | 21 | 30 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 71 | 29 |
| Feb | 67 | 33 |
| Mar | 73 | 27 |
| Apr | 82 | 18 |
| May | 87 | 13 |
| Jun | 93 | 7 |
| Jul | 80 | 20 |
| Aug | 82 | 18 |
| Sep | 89 | 11 |
| Oct | 87 | 13 |
| Nov | 79 | 21 |
| Dec | 70 | 30 |
Daylight, sunrise and sunset
Hours of daylight through the year, with sunrise and sunset times.
The gold band is daylight — sunrise runs along its lower edge, sunset along the upper — so it widens toward summer and pinches toward winter, with night the dark area above and below. The longest day, around June 12, brings about 14 h 12 min of light; the shortest, around January 1, only 9 h 48 min — a swing of roughly 4 h 24 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 10.1 | 10.8 | 11.7 | 12.8 | 13.7 | 14.2 | 14.0 | 13.2 | 12.2 | 11.2 | 10.3 | 9.8 |
| Sunrise (AM) | 7:35 | 7:17 | 6:43 | 6:02 | 5:31 | 5:21 | 5:32 | 5:53 | 6:14 | 6:36 | 7:04 | 7:28 |
| Sunset (PM) | 5:36 | 6:04 | 6:28 | 6:51 | 7:14 | 7:32 | 7:32 | 7:07 | 6:26 | 5:46 | 5:19 | 5:17 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 10.1 | 7:35 | 5:36 |
| Feb | 10.8 | 7:17 | 6:04 |
| Mar | 11.7 | 6:43 | 6:28 |
| Apr | 12.8 | 6:02 | 6:51 |
| May | 13.7 | 5:31 | 7:14 |
| Jun | 14.2 | 5:21 | 7:32 |
| Jul | 14.0 | 5:32 | 7:32 |
| Aug | 13.2 | 5:53 | 7:07 |
| Sep | 12.2 | 6:14 | 6:26 |
| Oct | 11.2 | 6:36 | 5:46 |
| Nov | 10.3 | 7:04 | 5:19 |
| Dec | 9.8 | 7:28 | 5:17 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
San Tan Valley averages about 21 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 15 and 26 days.
The sunnier stretch runs 3.0 months, from around Apr 8 to Jul 6. The sunniest month is June, with roughly 26 sunny days (brilliant).
The greyest month is February, down near 17 sunny days — about 36% fewer than the June peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 18 | 15 | 19 | 22 | 24 | 25 | 19 | 20 | 24 | 24 | 20 | 18 |
| Sky | Bright | Bright | Bright | Bright | Brilliant | Brilliant | Bright | Bright | Brilliant | Brilliant | Bright | Bright |
| Sunny days | Sky | |
|---|---|---|
| Jan | 18 | Bright |
| Feb | 15 | Bright |
| Mar | 19 | Bright |
| Apr | 22 | Bright |
| May | 24 | Brilliant |
| Jun | 25 | Brilliant |
| Jul | 19 | Bright |
| Aug | 20 | Bright |
| Sep | 24 | Brilliant |
| Oct | 24 | Brilliant |
| Nov | 20 | Bright |
| Dec | 18 | Bright |
Humidity comfort
Share of days at each humidity comfort level, based on the dew point — the measure that tracks how muggy it actually feels.
Humidity comfort is graded by the dew point — the temperature at which the air would be fully saturated — because it tracks how muggy it actually feels far better than relative humidity does. A low dew point feels dry and crisp; a high one feels sticky and oppressive no matter the reading on a humidity gauge.
In San Tan Valley, how humid it feels changes dramatically over the year.
The more humid part of the year lasts 3.1 months, from around June 28 to September 30. The muggiest month is August, when the air feels humid, muggy or worse about 41% of the time.
The most comfortable stretch runs from around October 1 to June 27, and May is the most comfortable month — the air is dry or comfortable 100% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 100 | 99 | 94 | 51 | 33 | 61 | 93 | 100 | 100 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 1 | 4 | 20 | 26 | 18 | 4 | 0 | 0 |
| Humid (%) | 0 | 0 | 0 | 0 | 0 | 2 | 16 | 25 | 13 | 2 | 0 | 0 |
| Muggy (%) | 0 | 0 | 0 | 0 | 0 | 1 | 11 | 13 | 7 | 0 | 0 | 0 |
| Oppressive (%) | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 3 | 1 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| Jan | 100 | 0 | 0 | 0 | 0 |
| Feb | 100 | 0 | 0 | 0 | 0 |
| Mar | 100 | 0 | 0 | 0 | 0 |
| Apr | 100 | 0 | 0 | 0 | 0 |
| May | 99 | 1 | 0 | 0 | 0 |
| Jun | 94 | 4 | 2 | 1 | 0 |
| Jul | 51 | 20 | 16 | 11 | 3 |
| Aug | 33 | 26 | 25 | 13 | 3 |
| Sep | 61 | 18 | 13 | 7 | 1 |
| Oct | 93 | 4 | 2 | 0 | 0 |
| Nov | 100 | 0 | 0 | 0 | 0 |
| Dec | 100 | 0 | 0 | 0 | 0 |
Wind
Average wind speed through the year, banded into plain-language speed zones so a number reads as 'breezy' or 'calm' without knowing the scale.
This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.
Wind in San Tan Valley is steady company: average speeds sit near 5 mph — calm — in every month of the year, with no meaningful windy or calm season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 6 | 5 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 6 | 6 | 5 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| Jan | 6 | calm |
| Feb | 5 | calm |
| Mar | 6 | calm |
| Apr | 6 | calm |
| May | 6 | calm |
| Jun | 6 | calm |
| Jul | 5 | calm |
| Aug | 5 | calm |
| Sep | 5 | calm |
| Oct | 6 | calm |
| Nov | 6 | calm |
| Dec | 5 | calm |
Best time to visit San Tan Valley
To characterize how pleasant the weather is in San Tan Valley throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around mid January, San Tan Valley is still near the start of its best-weather window — great conditions with the peak-season crowds not yet at full swing.
Inferred from the travel-score curve; month-by-month visitor numbers are a planned addition.
The travel score favors clear, rainless days with daytime highs between 64°F and 82°F. Based on this score, the best times of year to visit San Tan Valley for general outdoor tourist activities run from early January to late April and again from late October to mid December, with a peak score in the second week of November.
The travel score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Travel score (0–10) | 7.2 | 7.5 | 8.3 | 7.5 | 4.4 | 1.1 | 0.3 | 0.8 | 2.5 | 6.2 | 8.4 | 7.1 |
| Rating | good | good | ideal | good | fair | poor | poor | poor | poor | good | ideal | good |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 7.2 | good |
| Feb | 7.5 | good |
| Mar | 8.3 | ideal |
| Apr | 7.5 | good |
| May | 4.4 | fair |
| Jun | 1.1 | poor |
| Jul | 0.3 | poor |
| Aug | 0.8 | poor |
| Sep | 2.5 | poor |
| Oct | 6.2 | good |
| Nov | 8.4 | ideal |
| Dec | 7.1 | good |
The beach/pool score favors clear, rainless days with daytime highs between 75°F and 93°F. Based on this score, the best times of year to visit San Tan Valley for hot-weather activities run from mid March to late May and again from late September to mid November, with a peak score in the third week of April.
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
What to pack for San Tan Valley, by month
Month by month, what's worth putting in the bag — from the temperature range, rain chance, sun and wind. Tap a month for a quick packing note.
For a warm-season trip around July (highs near 103°F), the essentials are light clothes and sun protection. In the cold season around December (highs near 65°F), pack a warm layer.
In July, San Tan Valley sees daytime highs around 103°F and nights near 81°F. Pack light clothes and sun protection. About 4 days see rain.
UV index (midday) in San Tan Valley by month
Clear-sky midday UV index through the year, shaded by the WHO exposure levels — how much sun protection each month calls for.
Under clear skies, the midday UV index in San Tan Valley peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 4 | 5 | 5 | 7 | 9 | 11 | 11 | 11 | 9 | 6 | 4 | 3 |
| Level | Moderate | Moderate | Moderate | Very high | Very high | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 4 | Moderate |
| Feb | 5 | Moderate |
| Mar | 5 | Moderate |
| Apr | 7 | Very high |
| May | 9 | Very high |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 11 | Extreme |
| Sep | 9 | Very high |
| Oct | 6 | High |
| Nov | 4 | Moderate |
| Dec | 3 | Moderate |
Average hourly UV index in San Tan Valley
Modeled clear-sky UV for every hour of every day — when in the day sun protection actually matters.
The whole year hour by hour: each column is a day, each row an hour, and the color is the modeled clear-sky UV index — the midday peak scaled down as the sun sits lower in the sky. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
UV falls off far faster than brightness as the sun drops, so even in June the burn window is concentrated in the middle of the day: about 8.5 hours a day reach index 3 (protection recommended), and 6 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV ≥ 3 (h/day) | 3 | 4.5 | 5 | 7 | 8 | 8.5 | 8.5 | 8.5 | 7 | 5.5 | 4 | 1 |
| UV ≥ 6 (h/day) | 0 | 0 | 0 | 3.5 | 5 | 6 | 6 | 6 | 4.5 | 1.5 | 0 | 0 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 3 | 0 |
| Feb | 4.5 | 0 |
| Mar | 5 | 0 |
| Apr | 7 | 3.5 |
| May | 8 | 5 |
| Jun | 8.5 | 6 |
| Jul | 8.5 | 6 |
| Aug | 8.5 | 6 |
| Sep | 7 | 4.5 |
| Oct | 5.5 | 1.5 |
| Nov | 4 | 0 |
| Dec | 1 | 0 |
Air quality in San Tan Valley by month
Average fine-particle pollution (PM2.5) through the year — so you can see which months the air is worst, not just the yearly average.
Air quality in San Tan Valley is worst in June — around 28 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 12 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 13 | 13 | 14 | 14 | 14 | 28 | 14 | 13 | 13 | 12 | 13 | 13 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 13 | Moderate |
| Feb | 13 | Moderate |
| Mar | 14 | Moderate |
| Apr | 14 | Moderate |
| May | 14 | Moderate |
| Jun | 28 | Moderate |
| Jul | 14 | Moderate |
| Aug | 13 | Moderate |
| Sep | 13 | Moderate |
| Oct | 12 | Moderate |
| Nov | 13 | Moderate |
| Dec | 13 | Moderate |
Growing season
San Tan Valley is mild enough that a frost-free day stays more likely than not even in midwinter.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 96 | 99 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 99 | 96 |
| Frost nights | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 96 | 0 |
| Feb | 99 | 0 |
| Mar | 100 | 0 |
| Apr | 100 | 0 |
| May | 100 | 0 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 100 | 0 |
| Oct | 100 | 0 |
| Nov | 99 | 0 |
| Dec | 96 | 0 |
Growing degree days
Growing degree days tally heat above 50°F: each day adds however many degrees its average temperature runs over that threshold, and cold days add nothing. San Tan Valley banks about 8,197 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around July.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°F·days) | 127 | 200 | 398 | 588 | 886 | 1,130 | 1,301 | 1,265 | 1,062 | 753 | 372 | 115 |
| Growing degree days (°F·days) | |
|---|---|
| Jan | 127 |
| Feb | 200 |
| Mar | 398 |
| Apr | 588 |
| May | 886 |
| Jun | 1,130 |
| Jul | 1,301 |
| Aug | 1,265 |
| Sep | 1,062 |
| Oct | 753 |
| Nov | 372 |
| Dec | 115 |
Solar energy
Average daily shortwave solar energy reaching the ground, banded into brightness zones so the number means something at a glance.
Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.
San Tan Valley receives about 5.9 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 3.2 and 8.5 kWh/m².
The brighter stretch of the year lasts 6.4 months, from around Mar 15 to Sep 24. The brightest month is June, averaging about 8.4 kWh/m² (intense).
The dimmest month is December, down near 3.2 kWh/m² — roughly 62% less than the June peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 3.5 | 4.4 | 6.0 | 7.4 | 8.2 | 8.4 | 7.5 | 6.8 | 6.1 | 5.0 | 3.8 | 3.2 |
| Level | Moderate | Bright | Bright | Intense | Intense | Intense | Intense | Intense | Intense | Bright | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 3.5 | Moderate |
| Feb | 4.4 | Bright |
| Mar | 6.0 | Bright |
| Apr | 7.4 | Intense |
| May | 8.2 | Intense |
| Jun | 8.4 | Intense |
| Jul | 7.5 | Intense |
| Aug | 6.8 | Intense |
| Sep | 6.1 | Intense |
| Oct | 5.0 | Bright |
| Nov | 3.8 | Moderate |
| Dec | 3.2 | Moderate |
Where is San Tan Valley?
San Tan Valley sits at 33.2°N, 111.5°W, 1,516 ft above sea level, in United States. The nearest listed city is Queen Creek, 7.5 mi away.
Topography around San Tan Valley
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of San Tan Valley.
Within 2 miles, the terrain around San Tan Valley has only modest variations in elevation — a maximum elevation change of 92 ft around an average of 1,516 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,066 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,251 ft.
The land around San Tan Valley is covered by cropland (40%) and bare terrain (25%) within 2 miles, bare terrain (28%), grassland (27%) and shrubs (25%) within 10 miles, and shrubs (58%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for San Tan Valley (33.1911°, -111.528°, elevation 1,516 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).