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Average Weather in Sierra Vista Arizona, United States

In Sierra Vista, the summers are hot and partly cloudy and the winters are cold, dry, and mostly clear. Over the course of the year, the temperature typically varies from 37°F to 93°F and is rarely below 29°F or above 99°F.

Climate Summary

coolcomfortablewarmhotwarmcoolJanFebMarAprMayJunJulAugSepOctNovDec83%83%48%48%clearovercastprecipitation: 2.9 inprecipitation: 2.9 in0.1 in0.1 inmuggy: 4%muggy: 4%0%0%drydrytourism score: 7.8tourism score: 7.81.51.5
Click on each chart for more information.

Based on the tourism score, the best times of year to visit Sierra Vista for warm-weather activities are from early May to late June and from late August to mid October.

Temperature

The hot season lasts for 3.6 months, from May 23 to September 10, with an average daily high temperature above 86°F. The hottest day of the year is June 21, with an average high of 93°F and low of 68°F.

The cool season lasts for 3.1 months, from November 23 to February 25, with an average daily high temperature below 66°F. The coldest day of the year is January 3, with an average low of 37°F and high of 59°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

Average Hourly Temperature in Sierra VistaJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMvery coldvery coldcoldcoldcoldcoldcoolcoolcomfortablewarmhotwarmvery coldvery cold
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

San Juan, Argentina (5,150 miles away); Muzaffarābād, Pakistan (7,884 miles); and Gilgandra, Australia (7,916 miles) are the far-away foreign places with temperatures most similar to Sierra Vista (view comparison).

Clouds

In Sierra Vista, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Sierra Vista begins around March 6 and lasts for 4.0 months, ending around July 5. On June 8, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 83% of the time, and overcast or mostly cloudy 17% of the time.

The cloudier part of the year begins around July 5 and lasts for 8.0 months, ending around March 6. On July 30, the cloudiest day of the year, the sky is overcast or mostly cloudy 52% of the time, and clear, mostly clear, or partly cloudy 48% of the time.

Cloud Cover Categories

Cloud Cover Categories in Sierra VistaclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jun 883%Jun 883%Jul 3048%Jul 3048%Mar 665%Mar 665%Jul 566%Jul 566%clearovercastmostly clearpartly cloudy
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Sierra Vista varies very significantly throughout the year.

The wetter season lasts 2.2 months, from July 2 to September 9, with a greater than 28% chance of a given day being a wet day. The chance of a wet day peaks at 53% on July 30.

The drier season lasts 9.8 months, from September 9 to July 2. The smallest chance of a wet day is 2% on May 18.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 53% on July 30.

Daily Chance of Precipitation

Daily Chance of Precipitation in Sierra VistawetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jul 3053%Jul 3053%May 182%May 182%Jan 112%Jan 112%Jul 228%Jul 228%Sep 928%Sep 928%rain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Sierra Vista experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 9.2 months, from June 15 to March 20, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around July 30, with an average total accumulation of 2.9 inches.

The rainless period of the year lasts for 2.8 months, from March 20 to June 15. The least rain falls around May 21, with an average total accumulation of 0.1 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Sun

The length of the day in Sierra Vista varies significantly over the course of the year. In 2017, the shortest day is December 21, with 10 hours, 6 minutes of daylight; the longest day is June 20, with 14 hours, 13 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in Sierra VistaJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2014 hr, 13 minJun 2014 hr, 13 minJun 2012 hr, 8 minSep 2212 hr, 8 minSep 2210 hr, 6 minDec 2110 hr, 6 minDec 21nightnightday
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:15 AM on June 11, and the latest sunrise is 2 hours, 6 minutes later at 7:21 AM on January 9. The earliest sunset is at 5:17 PM on December 3, and the latest sunset is 2 hours, 13 minutes later at 7:30 PM on June 30.

Daylight saving time (DST) is not observed in Sierra Vista during 2017.

Sunrise & Sunset with Twilight

Sunrise & Sunset with Twilight in Sierra VistaJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 115:15 AMJun 115:15 AM7:30 PMJun 307:30 PMJun 30Dec 35:17 PMDec 35:17 PM7:21 AMJan 97:21 AMJan 9daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2017. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Humidity

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The perceived humidity level in Sierra Vista, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 2% of 2% throughout.

Humidity Comfort Levels

Humidity Comfort Levels in Sierra VistaJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Mar 140%Mar 140%Aug 84%Aug 84%humidhumiddrydrycomfortablecomfortable
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Sierra Vista experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 8.5 months, from October 12 to June 28, with average wind speeds of more than 7.7 miles per hour. The windiest day of the year is April 11, with an average hourly wind speed of 9.7 miles per hour.

The calmer time of year lasts for 3.5 months, from June 28 to October 12. The calmest day of the year is August 8, with an average hourly wind speed of 5.6 miles per hour.

Average Wind Speed

Average Wind Speed in Sierra VistawindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mph18 mphApr 119.7 mphApr 119.7 mphAug 85.6 mphAug 85.6 mphOct 127.7 mphOct 127.7 mphJun 287.7 mphJun 287.7 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Sierra Vista varies throughout the year.

The wind is most often from the west for 6.6 months, from February 3 to August 22, with a peak percentage of 54% on June 8. The wind is most often from the east for 5.3 months, from August 22 to February 3, with a peak percentage of 41% on January 1.

Wind Direction

Wind Direction in Sierra VistaEWEJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westeastnorthsouth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Best Time of Year to Visit

To characterize how pleasant the weather is in Sierra Vista throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best times of year to visit Sierra Vista for general outdoor tourist activities are from early May to late June and from late August to mid October, with a peak score in the first week of June.

Tourism Score

Tourism Score in Sierra Vistabest timebest timeJanFebMarAprMayJunJulAugSepOctNovDec02468107.87.81.51.57.77.76.16.1 precipitationprecipitationcloudscloudstourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Sierra Vista for hot-weather activities is from early June to mid July, with a peak score in the last week of June.

Beach/Pool Score

Beach/Pool Score in Sierra VistaJanFebMarAprMayJunJulAugSepOctNovDec02468106.96.90.10.1 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
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).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Growing Season

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Sierra Vista typically lasts for 9.0 months (275 days), from around February 26 to around November 28, rarely starting before January 25 or after March 25, and rarely ending before November 8 or after December 19.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Sierra Vistagrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Feb 2650%Feb 2650%Nov 2850%Nov 2890%Mar 2590%Mar 2590%Nov 890%Nov 810%Jan 2510%Jan 2510%Dec 1910%Dec 192%Jan 82%Jan 8Jul 14100%Jul 14100%very coldcoldcoolcomfortablewarmhot
The percentage of time spent in various temperature bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms in Sierra Vista should appear around January 31, only rarely appearing before January 21 or after February 13.

Growing Degree Days

The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 2.5 months, from April 14 to June 30, with an average daily incident shortwave energy per square meter above 7.6 kWh. The brightest day of the year is June 3, with an average of 8.6 kWh.

The darker period of the year lasts for 3.0 months, from November 6 to February 7, with an average daily incident shortwave energy per square meter below 4.5 kWh. The darkest day of the year is December 24, with an average of 3.5 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in Sierra VistabrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWh10 kWhJun 38.6 kWhJun 38.6 kWhDec 243.5 kWhDec 243.5 kWhApr 147.6 kWhApr 147.6 kWhNov 64.5 kWhNov 64.5 kWhFeb 74.5 kWhFeb 74.5 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Sierra Vista are 31.555 deg latitude, -110.304 deg longitude, and 4,616 ft elevation.

The topography within 2 miles of Sierra Vista contains only modest variations in elevation, with a maximum elevation change of 344 feet and an average elevation above sea level of 4,632 feet. Within 10 miles contains only modest variations in elevation (5,226 feet). Within 50 miles also contains extreme variations in elevation (7,205 feet).

The area within 2 miles of Sierra Vista is covered by shrubs (82%) and grassland (13%), within 10 miles by shrubs (75%) and trees (16%), and within 50 miles by shrubs (71%) and grassland (21%).

Data Sources

This report illustrates the typical weather in Sierra Vista, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Sierra Vista.

For each station, the records are corrected for the elevation difference between that station and Sierra Vista according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Sierra Vista is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Sierra Vista and a given station.

The stations contributing to this reconstruction are: Sierra Vista Municipal Libby Army Air Field (97%, 5.3 kilometers, northwest) and Bisbee-Douglas International Airport (2.6%, 67 kilometers, east).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.