Saint Johns station, Arizona climate: Climate normals at a NOAA weather station
Saint Johns station's normal year runs from 20°F December nights to 91°F July afternoons, with 9.4 inches of precipitation and 6 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.6°C, December lows of −7°C, July highs of 33°C, 238 mm of precipitation a year.
- NOAA stationSaint Johns station
- Station IDUSC00027435
- Location34.52°N 109.40°W
- Elevation5,790 ft (1,765 m)
On October 23, the normal high in Saint Johns station is 70°F and the normal low 36°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 Saint Johns station.
- Jan 50° 21°
- Feb 56° 24°
- Mar 64° 29°
- Apr 71° 35°
- May 80° 44°
- Jun 90° 52°
- Jul 91° 60°
- Aug 88° 58°
- Sep 83° 51°
- Oct 73° 38°
- Nov 60° 27°
- Dec 49° 20°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Saint Johns station each month?
July is the warmest month, with normal highs of 91°F; December the coldest, with normal lows of 20°F. The most precipitation falls in August (1.95 in), the least in June (0.19 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 50°F | 21°F | 35.1°F | 0.58 | 1.2 | 3 | <1 | 29 | 10 h |
| February | 56°F | 24°F | 39.9°F | 0.56 | 0.7 | 3 | <1 | 24 | 11 h |
| March | 64°F | 29°F | 46.3°F | 0.28 | 0.2 | 2 | <1 | 22 | 11 h 50 min |
| April | 71°F | 35°F | 53.1°F | 0.27 | 0.1 | 2 | <1 | 10 | 13 h |
| May | 80°F | 44°F | 61.9°F | 0.39 | 0.1 | 2 | 2 | 1 | 14 h |
| June | 90°F | 52°F | 71.2°F | 0.19 | 0.0 | 1 | 16 | <1 | 14 h 30 min |
| July | 91°F | 60°F | 75.3°F | 1.94 | 0.0 | 7 | 19 | <1 | 14 h 20 min |
| August | 88°F | 58°F | 72.8°F | 1.95 | 0.0 | 7 | 12 | <1 | 13 h 30 min |
| September | 83°F | 51°F | 66.8°F | 1.13 | 0.0 | 3 | 2 | <1 | 12 h 30 min |
| October | 73°F | 38°F | 55.4°F | 0.86 | 0.5 | 3 | <1 | 6 | 11 h 20 min |
| November | 60°F | 27°F | 43.7°F | 0.55 | 0.9 | 2 | <1 | 23 | 10 h 20 min |
| December | 49°F | 20°F | 34.5°F | 0.66 | 2.5 | 2 | <1 | 29 | 9 h 50 min |
| Year (annual) | 71°F | 38°F | 54.7°F | 9.36 | 6.2 | 37 | 51 | 144 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 10°C | −6°C | 1.7°C | 15 mm | 3 cm |
| February | 13°C | −5°C | 4.4°C | 14 mm | 2 cm |
| March | 18°C | −2°C | 7.9°C | 7 mm | 1 cm |
| April | 22°C | 2°C | 11.7°C | 7 mm | 0 cm |
| May | 27°C | 7°C | 16.6°C | 10 mm | 0 cm |
| June | 32°C | 11°C | 21.8°C | 5 mm | 0 cm |
| July | 33°C | 15°C | 24.1°C | 49 mm | 0 cm |
| August | 31°C | 14°C | 22.7°C | 50 mm | 0 cm |
| September | 28°C | 10°C | 19.3°C | 29 mm | 0 cm |
| October | 23°C | 3°C | 13.0°C | 22 mm | 1 cm |
| November | 16°C | −3°C | 6.5°C | 14 mm | 2 cm |
| December | 10°C | −7°C | 1.4°C | 17 mm | 6 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00027435; 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.
Which months are mildest at Saint Johns station?
Normal highs sit between 65°F and 85°F in April, May, September and October. Of those, April has the fewest days with rain (2).
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 USC00027435.
When is the last frost at Saint Johns station?
In Saint Johns station, the last spring frost (32°F) comes after May 2 in half of years and after May 17 in one year in ten; the first autumn frost comes before October 14 in half of years and before October 3 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
- May 21 year in 10 after May 17; 9 in 10 after April 18
- First autumn frost, half of years before
- October 141 year in 10 before October 3; 9 in 10 before October 27
NOAA puts the median frost-free season at 164 days, and the season without a hard freeze (28°F) at 185 days.
A hard freeze (28°F) comes after April 19 in half of springs and before October 23 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Saint Johns station in zone 6b in ZIP code 85936, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 7a: the coldest night of a typical year reaches 1°F (22 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Arizona · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00027435; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get at Saint Johns station?
In a normal year in Saint Johns station, 51 days a year reach 90°F (1 of them 100°F or more), 144 nights fall to 32°F or colder and 37 days bring measurable precipitation.
- Days at 90°F or more
- 51a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 144a normal year
- Days that stay below freezing
- 4high of 32°F or less
- Days with 0.01 inch of precipitation
- 37a normal year
- Days with 1 inch of snow or more
- 2a normal year
The highest temperature in this station's record (since 1901) is 104°F, on July 4, 1922; the lowest is −29°F, on January 7, 1971.
The wettest calendar year on that record is 1923, with 16.98 in; the snowiest season is 1931–32, with 47.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00027435; records: ACIS (NOAA Regional Climate Centers), station USC00027435. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Saint Johns station?
Over a year 86% of the sunlight that would reach the ground under clear skies gets through the clouds at Saint Johns station, 5.6 kWh per square metre a day. June is the sunniest month (91%) and July the cloudiest (80%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 82% | 3.3 |
| February | 82% | 4.2 |
| March | 86% | 5.7 |
| April | 89% | 7.1 |
| May | 90% | 7.9 |
| June | 91% | 8.3 |
| July | 80% | 6.8 |
| August | 82% | 6.4 |
| September | 87% | 5.9 |
| October | 90% | 4.9 |
| November | 87% | 3.7 |
| December | 81% | 2.9 |
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 many heating and cooling degree days does Saint Johns station record?
A normal year at Saint Johns station brings 4,638 heating degree days, 14% fewer than the median U.S. place (5,373), and 890 cooling degree days, 2% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,399 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 927 | 0 |
| February | 704 | 0 |
| March | 581 | 0 |
| April | 360 | 2 |
| May | 132 | 36 |
| June | 11 | 197 |
| July | 0 | 319 |
| August | 1 | 243 |
| September | 37 | 91 |
| October | 302 | 3 |
| November | 639 | 0 |
| December | 944 | 0 |
| Year (annual) | 4,638 | 890 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00027435. 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.
Have recent years at Saint Johns station been warmer than normal?
2025 averaged 57.1°F, 2.4°F above the 1991-2020 normal of 54.7°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 55.7°F | +1.0°F | 11.48 | 5.0 |
| 2022 | 54.7°F | at normal | 11.21 | 5.7 |
| 2023 | 55.1°F | +0.4°F | 8.50 | 11.5 |
| 2024 | 56.3°F | +1.6°F | 11.70 | 7.6 |
| 2025 | 57.1°F | +2.4°F | 6.79 | 8.5 |
Over 72 complete years from 1915 to 2025, the station's annual mean temperature rose at a fitted 1.3°F per century (+0.07°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00027435; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Saint Johns station's climate compare?
Saint Johns station is warmer than 17 of the 97 places with their own NOAA record in Arizona, and wetter than 35. Across the 7,247 U.S. stations with normals, its annual mean of 54.7°F is warmer than 59%.
In the Köppen classification computed from these normals, Saint Johns station 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 Saint Johns station share this climate record?
Concho 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.
- Concho, AZ0 people · 12 mi W
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 Saint Johns station's climate
What is the coldest month at Saint Johns station?
December, with a normal high of 49°F and a normal low of 20°F. The warmest is July (91°F by day, 60°F at night).
Does it snow at Saint Johns station?
Yes: 6 inches in a normal year, falling on 3 days with 0.1 inch or more, the most in December (2.5 inches).
What is the rainiest month at Saint Johns station?
August, with 1.95 in of precipitation in a normal year; the driest is June with 0.19 in.
What plant hardiness zone is Saint Johns station in?
The USDA's 2023 map puts Saint Johns station in zone 6b in ZIP code 85936, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 1°F (22 years, 1991-2020): zone 7a.
How late can frost come at Saint Johns station?
In half of years the last 32°F night comes after May 2; in one year in ten it comes after May 17. Waiting until May 17 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Arizona climateThe statewide normals and every place in the state
- St. Johns, AZ1 miles from this station, 54.2°F a year
- Springerville, AZ28 miles from this station, 50.2°F a year
- Petrified Forest National Park, AZ34 miles from this station, 55.6°F a year
- Greer, AZ34 miles from this station, 44.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made