Sierra Vista, Arizona climate: Normal weather by month, frost dates and records
Sierra Vista's normal year runs from 30°F January nights to 92°F July afternoons, with 13.0 inches of precipitation and less than an inch of snow (0.4 in) a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 16.4°C, January lows of −1°C, July highs of 33°C, 330 mm of precipitation a year.
- NOAA stationSierra Vista
- Station IDUSC00027880
- Location31.54°N 110.28°W
- Elevation4,606 ft (1,404 m)
- Population44,710
On October 22, the normal high in Sierra Vista is 79°F and the normal low 45°F, and the chance of measurable rain or snow is 8%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Sierra Vista.
- Jan 61° 30°
- Feb 64° 33°
- Mar 71° 38°
- Apr 78° 43°
- May 85° 50°
- Jun 94° 60°
- Jul 92° 63°
- Aug 90° 62°
- Sep 87° 57°
- Oct 80° 47°
- Nov 70° 37°
- Dec 62° 30°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Sierra Vista each month?
July is the warmest month, with normal highs of 92°F; January the coldest, with normal lows of 30°F. The most precipitation falls in July (3.53 in), the least in May (0.20 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 61°F | 30°F | 45.4°F | 0.78 | 4 | <1 | 15 | 10 h 20 min |
| February | 64°F | 33°F | 48.5°F | 0.64 | 4 | <1 | 8 | 11 h |
| March | 71°F | 38°F | 54.0°F | 0.48 | 2 | <1 | 3 | 12 h |
| April | 78°F | 43°F | 60.2°F | 0.25 | 1 | 1 | <1 | 13 h |
| May | 85°F | 50°F | 67.7°F | 0.20 | 1 | 9 | <1 | 13 h 40 min |
| June | 94°F | 60°F | 76.8°F | 0.54 | 2 | 25 | <1 | 14 h 10 min |
| July | 92°F | 63°F | 77.0°F | 3.53 | 12 | 21 | <1 | 14 h |
| August | 90°F | 62°F | 75.5°F | 3.31 | 11 | 18 | <1 | 13 h 20 min |
| September | 87°F | 57°F | 71.7°F | 1.31 | 5 | 11 | <1 | 12 h 20 min |
| October | 80°F | 47°F | 63.5°F | 0.59 | 3 | 2 | <1 | 11 h 30 min |
| November | 70°F | 37°F | 53.4°F | 0.53 | 2 | <1 | 4 | 10 h 30 min |
| December | 62°F | 30°F | 45.6°F | 0.85 | 3 | <1 | 15 | 10 h 10 min |
| Year (annual) | 78°F | 46°F | 61.6°F | 13.01 | 51 | 87 | 45 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 16°C | −1°C | 7.4°C | 20 mm |
| February | 18°C | 0°C | 9.2°C | 16 mm |
| March | 21°C | 3°C | 12.2°C | 12 mm |
| April | 25°C | 6°C | 15.7°C | 6 mm |
| May | 29°C | 10°C | 19.8°C | 5 mm |
| June | 34°C | 15°C | 24.9°C | 14 mm |
| July | 33°C | 17°C | 25.0°C | 90 mm |
| August | 32°C | 16°C | 24.2°C | 84 mm |
| September | 30°C | 14°C | 22.1°C | 33 mm |
| October | 27°C | 8°C | 17.5°C | 15 mm |
| November | 21°C | 3°C | 11.9°C | 13 mm |
| December | 16°C | −1°C | 7.6°C | 22 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00027880; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Sierra Vista?
Normal highs sit between 65°F and 85°F in March, April, May, October and November. Of those, April has the fewest days with rain (1).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00027880.
When is the last frost in Sierra Vista?
In Sierra Vista, the last spring frost (32°F) comes after April 5 in half of years and after April 21 in one year in ten; the first autumn frost comes before November 9 in half of years and before October 23 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 51 year in 10 after April 21; 9 in 10 after March 15
- First autumn frost, half of years before
- November 91 year in 10 before October 23; 9 in 10 before November 23
NOAA puts the median frost-free season at 216 days, and the season without a hard freeze (28°F) at 248 days.
A hard freeze (28°F) comes after March 15 in half of springs and before November 21 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Sierra Vista in zone 8b across its 3 ZIP code areas (8b in 85613, the largest).
Frost dates for every NOAA station in Arizona · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00027880; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
What hardiness zone is each Sierra Vista ZIP code in?
The USDA's 2023 map gives each ZIP code area one zone. Sierra Vista's 3 ZIP code areas are all in zone 8b. Each ZIP's frost dates are in the frost tool.
Source: USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; ZIP areas in the place: Census Bureau 2020 ZCTA-to-place relationship file. A ZIP area counts when at least a tenth of its land (and 0.5 km²) lies in the place.
How hot and how cold does it get in Sierra Vista?
In a normal year in Sierra Vista, 87 days a year reach 90°F (7 of them 100°F or more), 45 nights fall to 32°F or colder and 51 days bring measurable precipitation.
- Days at 90°F or more
- 87a normal year
- Days at 100°F or more
- 7a normal year
- Nights at 32°F or colder
- 45a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 51a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00027880.
How sunny is Sierra Vista?
Over a year 89% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Sierra Vista, 5.8 kWh per square metre a day. May is the sunniest month (94%) and July the cloudiest (79%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 87% | 3.8 |
| February | 87% | 4.7 |
| March | 90% | 6.2 |
| April | 94% | 7.6 |
| May | 94% | 8.3 |
| June | 92% | 8.1 |
| July | 79% | 6.5 |
| August | 83% | 6.3 |
| September | 87% | 5.8 |
| October | 92% | 5.2 |
| November | 90% | 4.1 |
| December | 87% | 3.5 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Sierra Vista need?
A normal year in Sierra Vista brings 2,666 heating degree days, 50% fewer than the median U.S. place (5,373), and 1,450 cooling degree days, 60% more than the median (908). Five months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 4,768 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 608 | 0 |
| February | 462 | 0 |
| March | 342 | 1 |
| April | 161 | 15 |
| May | 42 | 126 |
| June | 1 | 353 |
| July | 0 | 372 |
| August | 0 | 326 |
| September | 4 | 207 |
| October | 94 | 49 |
| November | 350 | 2 |
| December | 603 | 0 |
| Year (annual) | 2,666 | 1,450 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00027880. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Sierra Vista been warmer than normal lately?
2022 averaged 61.0°F, 0.6°F below the 1991-2020 normal of 61.6°F. 1 of the 2 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 62.2°F | +0.6°F | 14.01 |
| 2022 | 61.0°F | −0.6°F | 16.08 |
Source: observed years: ACIS, station USC00027880. A year counts only with all twelve months complete.
How does Sierra Vista's climate compare?
Sierra Vista is warmer than 33 of the other 96 places with their own NOAA record in Arizona, and wetter than 58. Across the 7,247 U.S. stations with normals, its annual mean of 61.6°F is warmer than 79%.
In the Köppen classification computed from these normals, Sierra Vista is BSk: cold semi-arid steppe. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Sierra Vista share this climate record?
Sierra Vista Southeast has no NOAA station with 1991-2020 normals of its own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Sierra Vista Southeast, AZ14,213 people · 7 mi SE
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Sierra Vista's climate
What is the coldest month in Sierra Vista?
January, with a normal high of 61°F and a normal low of 30°F. The warmest is July (92°F by day, 63°F at night).
Does it snow in Sierra Vista?
Rarely: NOAA's normal is 0.4 inch a year.
What is the rainiest month in Sierra Vista?
July, with 3.53 in of precipitation in a normal year; the driest is May with 0.20 in.
What plant hardiness zone is Sierra Vista in?
The USDA's 2023 map puts Sierra Vista in zone 8b across its 3 ZIP code areas (8b in 85613, the largest).
How late can frost come in Sierra Vista?
In half of years the last 32°F night comes after April 5; in one year in ten it comes after April 21. Waiting until April 21 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Sierra Vista in OctoberThis month day by day, its records and recent years
- Arizona climateThe statewide normals and every place in the state
- Fort Huachuca Pioneer Airfield, AZ10 miles from this station, 62.7°F a year
- Coronado National Memorial, AZ13 miles from this station, 61.3°F a year
- Elgin, AZ14 miles from this station, 59.8°F a year
- Canelo (1 mi NW), AZ15 miles from this station, 58.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made