Climate and average weather in Sierra Vista
In Sierra Vista, the summers are sweltering, dry, and clear and the winters are cool, snowy, and mostly clear.
Over the course of the year, the temperature in Sierra Vista typically varies from 35°F to 92°F, and is rarely below 26°F or above 99°F. June is the hottest month of the year, while December is the coldest.
Based on the travel score, the best times of year to visit Sierra Vista for warm-weather activities are from early March to mid May and late September to late November.
- Hottest
- Jun
- 92°
- Coldest
- Dec
- 35°
- Wettest
- Jul
- 2.7 in
- Driest
- Apr
- 0.2 in
- Rain / yr
- 11.8 in
- 57 wet days
- Daylight
- 9.9–14.1 h
- shortest–longest
- Elevation
- 4,633 ft
- 31.6°N
- Clearest
- Oct
- 25% cloud
Sierra Vista is city in Cochise County, Arizona, United States.
- Density
- 110/km²
- people per km²
- Founded
- 1956
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Sierra Vista 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 March to mid May.
Temperature through the year
Daily average highs and lows in Sierra Vista, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 4.1 months, from May 18 to September 19, with daily high temperatures above 84°F. The hottest month of the year in Sierra Vista is June, with an average high of 92°F and low of 62°F.
The cool season lasts 3.2 months, from November 24 to February 28, with daily high temperatures below 64°F. The coldest month of the year in Sierra Vista is December, with an average low of 35°F and high of 58°F.
Days typically run about 25°F warmer than nights, with the widest day–night swing (around 30°F) in May.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 59 | 62 | 68 | 75 | 84 | 92 | 90 | 87 | 84 | 77 | 67 | 58 |
| Avg low (°F) | 35 | 37 | 41 | 46 | 53 | 62 | 67 | 65 | 62 | 52 | 43 | 35 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| Jan | 59 | 35 |
| Feb | 62 | 37 |
| Mar | 68 | 41 |
| Apr | 75 | 46 |
| May | 84 | 53 |
| Jun | 92 | 62 |
| Jul | 90 | 67 |
| Aug | 87 | 65 |
| Sep | 84 | 62 |
| Oct | 77 | 52 |
| Nov | 67 | 43 |
| Dec | 58 | 35 |
How hot and cold Sierra Vista 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, Sierra Vista feels like about 93°F (around June 22). About 41 days a year carry some heat stress, peaking in June.
On the coldest nights, wind chill pulls the feels-like down to about 29°F (around December 25), with roughly 62 freezing days a year (feels-like at or below 32°F), worst in December.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°F) | 59 | 62 | 68 | 75 | 84 | 92 | 90 | 87 | 84 | 77 | 67 | 58 |
| Air high (°F) | 59 | 62 | 68 | 75 | 84 | 92 | 90 | 87 | 84 | 77 | 67 | 58 |
| Feels-like low (°F) | 31 | 33 | 37 | 42 | 53 | 62 | 67 | 65 | 62 | 52 | 39 | 31 |
| Air low (°F) | 35 | 37 | 41 | 46 | 53 | 62 | 67 | 65 | 62 | 52 | 43 | 35 |
| Feels-like high (°F) | Air high (°F) | Feels-like low (°F) | Air low (°F) | |
|---|---|---|---|---|
| Jan | 59 | 59 | 31 | 35 |
| Feb | 62 | 62 | 33 | 37 |
| Mar | 68 | 68 | 37 | 41 |
| Apr | 75 | 75 | 42 | 46 |
| May | 84 | 84 | 53 | 53 |
| Jun | 92 | 92 | 62 | 62 |
| Jul | 90 | 90 | 67 | 67 |
| Aug | 87 | 87 | 65 | 65 |
| Sep | 84 | 84 | 62 | 62 |
| Oct | 77 | 77 | 52 | 52 |
| Nov | 67 | 67 | 39 | 43 |
| Dec | 58 | 58 | 31 | 35 |
Average hourly temperature in Sierra Vista
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 June afternoons, near 92°F, and coldest before dawn in December, near 35°F.
Sierra Vista weather by month
Every month at a glance. Click a month for its detailed page.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 59° / 35° | 0.9 | 3.6 | 0.6 | 10.2 | 5.6 |
| Feb | 62° / 37° | 0.8 | 4 | 0.5 | 10.8 | 6.4 |
| Mar | 68° / 41° | 0.5 | 2.7 | 0.4 | 11.8 | 7.9 |
| Apr | 75° / 46° | 0.2 | 1.5 | 0.1 | 12.7 | 8.8 |
| May | 84° / 53° | 0.2 | 1.6 | 0 | 13.6 | 7.3 |
| Jun | 92° / 62° | 0.4 | 2.9 | 0 | 14 | 4.3 |
| Jul | 90° / 67° | 2.7 | 12.8 | 0 | 13.8 | 3.8 |
| Aug | 87° / 65° | 2.5 | 12.8 | 0 | 13.2 | 4.6 |
| Sep | 84° / 62° | 1.4 | 6.1 | 0 | 12.2 | 6.3 |
| Oct | 77° / 52° | 0.5 | 2.9 | 0 | 11.2 | 8.5 |
| Nov | 67° / 43° | 0.6 | 2.3 | 0.1 | 10.4 | 7.8 |
| Dec | 58° / 35° | 0.9 | 3.9 | 1.1 | 10 | 5.3 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Sierra Vista gets about 11.8 in of precipitation a year. On a typical day the chance of rain is some rain, but that rises and falls sharply with the seasons.
The wetter season lasts 2.9 months, from around Jun 25 to Sep 21, peaking in July at about 49% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Apr 29.
July is the wettest month by volume, with 2.7 in over about 13 wet days; April is the driest, with 0.2 in. Some of the cold-season precipitation falls as snow.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 12 | 14 | 9 | 5 | 5 | 11 | 40 | 41 | 21 | 9 | 8 | 12 |
| Rain days | 4 | 4 | 3 | 2 | 2 | 3 | 13 | 13 | 6 | 3 | 2 | 4 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 12 | 4 |
| Feb | 14 | 4 |
| Mar | 9 | 3 |
| Apr | 5 | 2 |
| May | 5 | 2 |
| Jun | 11 | 3 |
| Jul | 40 | 13 |
| Aug | 41 | 13 |
| Sep | 21 | 6 |
| Oct | 9 | 3 |
| Nov | 8 | 2 |
| Dec | 12 | 4 |
Monthly rainfall
Over a full year, Sierra Vista collects about 11.8 in of rain across 57 wet days — roughly 1.0 in in an average month.
It doesn’t fall evenly. July is the wettest month with 2.7 in, while April is the driest at just 0.2 in. The three wettest months alone bring about 55% of the year’s total, and some of the cold-season precipitation falls as snow.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (in) | 0.9 | 0.8 | 0.5 | 0.2 | 0.2 | 0.4 | 2.7 | 2.5 | 1.4 | 0.5 | 0.6 | 0.9 |
| Rain days | 4 | 4 | 3 | 2 | 2 | 3 | 13 | 13 | 6 | 3 | 2 | 4 |
| Snow days | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Rainfall (in) | Rain days | Snow days | |
|---|---|---|---|
| Jan | 0.9 | 4 | 1 |
| Feb | 0.8 | 4 | 1 |
| Mar | 0.5 | 3 | 0 |
| Apr | 0.2 | 2 | 0 |
| May | 0.2 | 2 | 0 |
| Jun | 0.4 | 3 | 0 |
| Jul | 2.7 | 13 | 0 |
| Aug | 2.5 | 13 | 0 |
| Sep | 1.4 | 6 | 0 |
| Oct | 0.5 | 3 | 0 |
| Nov | 0.6 | 2 | 0 |
| Dec | 0.9 | 4 | 1 |
Snow in Sierra Vista
Average snowy days through the year, the snow-season span, and estimated snowfall — for ski trips and the perennial 'will there be snow at Christmas?' question.
Sierra Vista averages about 3 snowy days a year. Snow season runs roughly Dec 7 to Mar 5 — about 2.9 months.
December is snowiest, with roughly 0.9 day of snow and an estimated 1 in of snowfall. Over the year that adds up to an estimated 4 in of snow.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snow days | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Snowfall (in) | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Snow days | Snowfall (in) | |
|---|---|---|
| Jan | 1 | 1 |
| Feb | 1 | 1 |
| Mar | 0 | 1 |
| Apr | 0 | 0 |
| May | 0 | 0 |
| Jun | 0 | 0 |
| Jul | 0 | 0 |
| Aug | 0 | 0 |
| Sep | 0 | 0 |
| Oct | 0 | 0 |
| Nov | 0 | 0 |
| Dec | 1 | 1 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Sierra Vista, the average share of the sky covered by clouds shows moderate seasonal variation over the course of the year.
The clearer part of the year begins around September 4 and lasts for 2.6 months, ending around November 21. The clearest month is October, when the sky is clear, mostly clear, or partly cloudy 86% of the time on average.
The cloudier part of the year begins around June 30 and lasts for 2.2 months, ending around September 3. The cloudiest month is July, when it is overcast or mostly cloudy 37% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 70 | 69 | 75 | 82 | 85 | 84 | 63 | 67 | 83 | 86 | 78 | 72 |
| Cloudier (%) | 30 | 31 | 25 | 18 | 15 | 16 | 37 | 33 | 17 | 14 | 22 | 28 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 70 | 30 |
| Feb | 69 | 31 |
| Mar | 75 | 25 |
| Apr | 82 | 18 |
| May | 85 | 15 |
| Jun | 84 | 16 |
| Jul | 63 | 37 |
| Aug | 67 | 33 |
| Sep | 83 | 17 |
| Oct | 86 | 14 |
| Nov | 78 | 22 |
| Dec | 72 | 28 |
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 18, brings about 14 h 06 min of light; the shortest, around December 17, only 9 h 54 min — a swing of roughly 4 h 12 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 10.2 | 10.8 | 11.8 | 12.7 | 13.6 | 14.0 | 13.8 | 13.2 | 12.2 | 11.2 | 10.4 | 10.0 |
| Sunrise (AM) | 7:26 | 7:10 | 6:38 | 5:58 | 5:29 | 5:20 | 5:31 | 5:50 | 6:10 | 6:30 | 6:56 | 7:19 |
| Sunset (PM) | 5:35 | 6:01 | 6:24 | 6:45 | 7:06 | 7:23 | 7:23 | 7:00 | 6:21 | 5:43 | 5:17 | 5:16 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 10.2 | 7:26 | 5:35 |
| Feb | 10.8 | 7:10 | 6:01 |
| Mar | 11.8 | 6:38 | 6:24 |
| Apr | 12.7 | 5:58 | 6:45 |
| May | 13.6 | 5:29 | 7:06 |
| Jun | 14.0 | 5:20 | 7:23 |
| Jul | 13.8 | 5:31 | 7:23 |
| Aug | 13.2 | 5:50 | 7:00 |
| Sep | 12.2 | 6:10 | 6:21 |
| Oct | 11.2 | 6:30 | 5:43 |
| Nov | 10.4 | 6:56 | 5:17 |
| Dec | 10.0 | 7:19 | 5:16 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Sierra Vista averages about 18 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 8 and 23 days.
The sunnier stretch runs 2.7 months, from around Sep 11 to Dec 1. The sunniest month is October, with roughly 22 sunny days (bright).
The greyest month is July, down near 10 sunny days — about 53% fewer than the October peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 18 | 15 | 19 | 21 | 22 | 20 | 11 | 13 | 19 | 23 | 19 | 18 |
| Sky | Bright | Bright | Bright | Bright | Bright | Bright | Mixed | Mixed | Bright | Bright | Bright | Bright |
| Sunny days | Sky | |
|---|---|---|
| Jan | 18 | Bright |
| Feb | 15 | Bright |
| Mar | 19 | Bright |
| Apr | 21 | Bright |
| May | 22 | Bright |
| Jun | 20 | Bright |
| Jul | 11 | Mixed |
| Aug | 13 | Mixed |
| Sep | 19 | Bright |
| Oct | 23 | Bright |
| Nov | 19 | 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 Sierra Vista, how humid it feels changes dramatically over the year.
The more humid part of the year lasts 2.8 months, from around June 29 to September 20. The muggiest month is August, when the air feels humid, muggy or worse about 35% of the time.
The most comfortable stretch runs from around September 21 to June 28, 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 | 100 | 94 | 45 | 32 | 67 | 97 | 100 | 100 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 5 | 28 | 33 | 22 | 2 | 0 | 0 |
| Humid (%) | 0 | 0 | 0 | 0 | 0 | 2 | 24 | 33 | 10 | 0 | 0 | 0 |
| Muggy (%) | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 2 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| Jan | 100 | 0 | 0 | 0 |
| Feb | 100 | 0 | 0 | 0 |
| Mar | 100 | 0 | 0 | 0 |
| Apr | 100 | 0 | 0 | 0 |
| May | 100 | 0 | 0 | 0 |
| Jun | 94 | 5 | 2 | 0 |
| Jul | 45 | 28 | 24 | 2 |
| Aug | 32 | 33 | 33 | 2 |
| Sep | 67 | 22 | 10 | 0 |
| Oct | 97 | 2 | 0 | 0 |
| Nov | 100 | 0 | 0 | 0 |
| Dec | 100 | 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.
Across the year, average wind speed in Sierra Vista is typically calm, near 6 mph, and varies little with the seasons.
The windier part of the year lasts 4.8 months, from around Feb 1 to Jun 26. The windiest month is April, averaging about 7 mph (calm).
The calmer part of the year runs from around Jun 27 to Jan 31, with August the calmest month at about 4 mph.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 5 | 6 | 7 | 7 | 7 | 6 | 5 | 4 | 5 | 5 | 5 | 5 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| Jan | 5 | calm |
| Feb | 6 | calm |
| Mar | 7 | calm |
| Apr | 7 | calm |
| May | 7 | calm |
| Jun | 6 | calm |
| Jul | 5 | calm |
| Aug | 4 | calm |
| Sep | 5 | calm |
| Oct | 5 | calm |
| Nov | 5 | calm |
| Dec | 5 | calm |
Best time to visit Sierra Vista
To characterize how pleasant the weather is in Sierra Vista throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around mid March, Sierra Vista 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 Sierra Vista for general outdoor tourist activities run from early March to mid May and again from late September to late November, with a peak score in the third week of April.
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) | 5.5 | 6.4 | 7.8 | 8.8 | 7.3 | 4.4 | 3.8 | 4.6 | 6.3 | 8.5 | 7.7 | 5.4 |
| Rating | good | good | ideal | ideal | good | fair | fair | fair | good | ideal | ideal | fair |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 5.5 | good |
| Feb | 6.4 | good |
| Mar | 7.8 | ideal |
| Apr | 8.8 | ideal |
| May | 7.3 | good |
| Jun | 4.4 | fair |
| Jul | 3.8 | fair |
| Aug | 4.6 | fair |
| Sep | 6.3 | good |
| Oct | 8.5 | ideal |
| Nov | 7.7 | ideal |
| Dec | 5.4 | fair |
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 Sierra Vista for hot-weather activities run from mid April to late June and again from late August to late October, with a peak score in the third week of May.
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 Sierra Vista, 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 June (highs near 92°F), the essentials are light clothes and sun protection. In the cold season around December (highs near 58°F), pack a warm layer.
In June, Sierra Vista sees daytime highs around 92°F and nights near 62°F. Pack light clothes and sun protection.
UV index (midday) in Sierra Vista 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 Sierra Vista peaks around June 22 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 4 (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 | 7 | 10 | 10 | 12 | 12 | 12 | 10 | 7 | 5 | 4 |
| Level | Moderate | High | High | Very high | Very high | Extreme | Extreme | Extreme | Very high | Very high | High | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 4 | Moderate |
| Feb | 5 | High |
| Mar | 7 | High |
| Apr | 10 | Very high |
| May | 10 | Very high |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 12 | Extreme |
| Sep | 10 | Very high |
| Oct | 7 | Very high |
| Nov | 5 | High |
| Dec | 4 | Moderate |
Average hourly UV index in Sierra Vista
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 9 hours a day reach index 3 (protection recommended), and 6.5 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) | 4 | 5 | 6.5 | 7.5 | 8.5 | 9 | 9 | 8.5 | 7.5 | 6 | 4.5 | 3 |
| UV ≥ 6 (h/day) | 0 | 0 | 3 | 5 | 5.5 | 6.5 | 6.5 | 6 | 5 | 3 | 0 | 0 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 4 | 0 |
| Feb | 5 | 0 |
| Mar | 6.5 | 3 |
| Apr | 7.5 | 5 |
| May | 8.5 | 5.5 |
| Jun | 9 | 6.5 |
| Jul | 9 | 6.5 |
| Aug | 8.5 | 6 |
| Sep | 7.5 | 5 |
| Oct | 6 | 3 |
| Nov | 4.5 | 0 |
| Dec | 3 | 0 |
Growing season
Sierra Vista is mild enough that a frost-free day stays more likely than not even in midwinter. Nights are reliably above freezing from about March 6 to November 23 (263 days); outside that window a hard frost is an occasional risk.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 71 | 80 | 94 | 99 | 100 | 100 | 100 | 100 | 100 | 100 | 94 | 70 |
| Frost nights | 31 | 28 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8 | 31 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 71 | 31 |
| Feb | 80 | 28 |
| Mar | 94 | 5 |
| Apr | 99 | 0 |
| May | 100 | 0 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 100 | 0 |
| Oct | 100 | 0 |
| Nov | 94 | 8 |
| Dec | 70 | 31 |
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. Sierra Vista banks about 4,834 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) | 0 | 7 | 148 | 319 | 577 | 808 | 873 | 810 | 690 | 461 | 141 | 0 |
| Growing degree days (°F·days) | |
|---|---|
| Jan | 0 |
| Feb | 7 |
| Mar | 148 |
| Apr | 319 |
| May | 577 |
| Jun | 808 |
| Jul | 873 |
| Aug | 810 |
| Sep | 690 |
| Oct | 461 |
| Nov | 141 |
| Dec | 0 |
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.
Sierra Vista receives about 5.9 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 3.5 and 8.4 kWh/m².
The brighter stretch of the year lasts 6.2 months, from around Mar 10 to Sep 15. The brightest month is June, averaging about 8.1 kWh/m² (intense).
The dimmest month is December, down near 3.5 kWh/m² — roughly 56% less than the June peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 3.8 | 4.8 | 6.3 | 7.7 | 8.3 | 8.2 | 6.9 | 6.5 | 6.0 | 5.3 | 4.1 | 3.5 |
| Level | Moderate | Bright | Intense | Intense | Intense | Intense | Intense | Intense | Bright | Bright | Bright | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 3.8 | Moderate |
| Feb | 4.8 | Bright |
| Mar | 6.3 | Intense |
| Apr | 7.7 | Intense |
| May | 8.3 | Intense |
| Jun | 8.2 | Intense |
| Jul | 6.9 | Intense |
| Aug | 6.5 | Intense |
| Sep | 6.0 | Bright |
| Oct | 5.3 | Bright |
| Nov | 4.1 | Bright |
| Dec | 3.5 | Moderate |
Where is Sierra Vista?
Sierra Vista sits at 31.6°N, 110.3°W, 4,633 ft above sea level, in United States. The nearest listed city is Cananea, 39 mi away.
Topography around Sierra Vista
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Sierra Vista.
Within 2 miles, the terrain around Sierra Vista has only modest variations in elevation — a maximum elevation change of 377 ft around an average of 4,646 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 5,213 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,077 ft.
The land around Sierra Vista is covered by grassland (32%), artificial surfaces (32%) and shrubs (31%) within 2 miles, shrubs (62%) within 10 miles, and shrubs (67%) and grassland (23%) 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 Sierra Vista (31.5545°, -110.3037°, elevation 4,633 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).