Saint Johns, AZ Climate: Temperature & Rain by Month
Explore NOAA NCEI's 1991–2020 climate normals → and a clearly labeled PlainClimate comfort calculation
30-year climate normals (1991-2020) from Saint Johns's primary NOAA station, SAINT JOHNS.
The climate verdict for Saint Johns
Dryness leads the climate profile for Saint Johns, Arizona, with 9.4 inches of precipitation a year. NOAA records an annual average of 55°F. At 44/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 10% of scores.
- 55°F
- average temperature, NOAA 1991-2020 normal
- 44/100
- comfort score, above 10% of station-mapped location scores
- 9.4"
- annual precipitation · 6" snow
- 165 days
- frost-free days per growing season
Saint Johns: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00027435 · Saint Johns, AZ 55°F mean · 9.4" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-ARID · SWING-MID · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 55°F
- RANK-MID #4,048
- PHOTO-FINISH ≈ Free Union
- PRCP-ARID 9.4"
- SWING-MID 41°F
- COMF-LOW 44/100
- LOAD-HEAT 4,638 HDD
- STN-1 USC00027435
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Free Union, VA (+ 0.1 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every AZ station list.
- Saint Johns (this station) 55°F
- Cold Big Stone Gap, VA 55°F
- Hot Stearns, KY 55°F
- Near Free Union, VA 55°F
- Near Pennington Gap, VA 55°F
Climate Living Index · Saint Johns
Saint Johns: 36/100 · grade F
Saint Johns publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Saint Johns, not an official NOAA rating. Rankings still use Comfort Score 44/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Snowfall burden | 6.2 inches/year | 69/100 · C |
| Annual temperature balance | 54.7°F · 12.8° from 67.5°F | 58/100 · C |
| Frost-free season | 165 days/year | 38/100 · F |
| Normal heat + freeze calendar | 196 calendar days | 16/100 · F |
| Precipitation balance | 9.4 in · 25.6 from 35 in | 10/100 · F |
Saint Johns · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Saint Johns's normals sit in a dry climate class: BSk
Precipitation is low relative to temperature but above true desert thresholds: cold semi-arid steppe (BSk). Class BSk is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: dry (arid or semi-arid), specifically cold semi-arid steppe.
- Köppen code
- BSk
- Group
- Dry (arid or semi-arid)
- Warmest month
- 75.3°F
- Coldest month
- 34.5°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Saint Johns sits across the climate record
Three NOAA fields for Saint Johns's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 59th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Drier than 95%
- Saint Johns's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- 39th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Saint Johns compares across U.S. station-mapped locations
Saint Johns's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
44 10th percentile score exceeds 10% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). This entry sits in this band.
- 50–60: 1,329 station-mapped locations (21%). Above this entry.
- 60–70: 1,236 station-mapped locations (20%). Above this entry.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Saint Johns's measured station temperature trend
MethodologyAcross 72 complete annual observations from 1915 to 2025, SAINT JOHNS warmed at a fitted rate of 0.07°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Saint Johns primary station fitted change +0.07 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 50°F (10°C) | 21°F (-6°C) | 35°F (2°C) | 0.6" | 1.2" | 29.1 | 0.0 |
| February | 56°F (13°C) | 24°F (-5°C) | 40°F (4°C) | 0.6" | 0.7" | 24.2 | 0.0 |
| March | 64°F (18°C) | 29°F (-2°C) | 46°F (8°C) | 0.3" | 0.2" | 21.5 | 0.0 |
| April | 71°F (22°C) | 35°F (2°C) | 53°F (12°C) | 0.3" | 0.1" | 10.2 | 0.0 |
| May | 80°F (27°C) | 44°F (7°C) | 62°F (17°C) | 0.4" | 0.1" | 1.4 | 1.7 |
| June | 90°F (32°C) | 52°F (11°C) | 71°F (22°C) | 0.2" | 0.0" | 0.0 | 16.1 |
| July | 91°F (33°C) | 60°F (15°C) | 75°F (24°C) | 1.9" | 0.0" | 0.0 | 19.2 |
| August | 88°F (31°C) | 58°F (14°C) | 73°F (23°C) | 1.9" | 0.0" | 0.0 | 11.5 |
| September | 83°F (28°C) | 51°F (10°C) | 67°F (19°C) | 1.1" | 0.0" | 0.1 | 2.1 |
| October | 73°F (23°C) | 38°F (3°C) | 55°F (13°C) | 0.9" | 0.5" | 6.1 | 0.0 |
| November | 60°F (16°C) | 27°F (-3°C) | 44°F (7°C) | 0.6" | 0.9" | 22.6 | 0.0 |
| December | 49°F (10°C) | 20°F (-7°C) | 35°F (1°C) | 0.7" | 2.5" | 29.0 | 0.0 |
The year, day by day
Saint Johns works both ends of the calendar. Normal highs climb to 92°F by June 28 and hold at or above 90°F on 43 dates, then normal lows drop to freezing or below on 153 dates, bottoming at 19°F around December 20.
When the heat sits
Normal highs reach 90°F from June 14 through July 26, covering 43 dates. The broader mild season, normal highs of 70°F or more, runs April 12 to October 22.
This counts calendar dates whose 1991–2020 normal high reaches 90°F. It is a smaller number than the 90°F+ day counts in the monthly table above, which measure how often the threshold was actually crossed in a typical year. A date can average 88°F and still exceed 90°F in half of all years.
The freezing stretch
The normal low stays at or below 32°F into April 3, then returns to freezing around November 3, covering 153 dates in all.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
Where the wet dates fall
The likeliest wet date is August 1, when 26% of years recorded at least a hundredth of an inch. The driest is June 4 at 4%. Summed across the calendar, that is about 37 wet dates a year.
The widest day
June 11 carries the biggest normal gap between afternoon and dawn, 39°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Saint Johns.
Where Saint Johns Stands Nationally
Aridity defines the water calendar: about 9 inches in a normal year lands this among the driest tenth of ranked stations.
Day-to-night contrast is extreme by national standards — the widest normal daily swing reaches about 39°F, sharper than nine in ten ranked stations see.
Saint Johns earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 1.2"
2.9 days with precipitation
Snow: 0.7"
2.6 days with precipitation
Snow: 0.2"
1.9 days with precipitation
Snow: 0.1"
1.6 days with precipitation
Snow: 0.1"
1.9 days with precipitation
1.3 days with precipitation
6.7 days with precipitation
7.4 days with precipitation
3.3 days with precipitation
Snow: 0.5"
2.6 days with precipitation
Snow: 0.9"
2.1 days with precipitation
Snow: 2.5"
2.4 days with precipitation
Saint Johns runs a summer-peaked wet season
44% of Saint Johns's yearly precipitation falls in June, July and August alone, against the 25% an evenly spread year would give those three months. The wettest month is August at 1.9", on a 40.8°F seasonal spread. Warm-season convection and, across the Southwest, the North American monsoon produce this shape: rain arrives in short heavy bursts during the hottest part of the year rather than as long cool-season soaking.
- Wettest three months: August, July, September, taking 54% of the annual total between them.
- Driest month: June at 0.2".
- Winter share: 19% falls in December, January and February.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A summer-peaked label means the June-August share reaches 35%; it describes timing across an average year, not any single season, and says nothing about how heavy an individual storm can be.
How Saint Johns's precipitation splits across the calendar
About 37 days a year record measurable precipitation here, carrying 9.4" between them, or roughly 0.26 inches on a typical wet day. That sits in the middle band: neither the many-light-days pattern of the Pacific Northwest and the Great Lakes, nor the few-heavy-events pattern of the Gulf and the desert Southwest.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
Snow reaches Saint Johns, but rarely amounts to much
The normals record 6.2 inches of snow a year here, most likely in December. That is a real but marginal amount: enough that snow is part of the local record, not enough to define the winter.
A figure in this range usually reflects a handful of events that melt quickly rather than a season of accumulation; about 3 days a year record any measurable snow at all.
NOAA 1991-2020 normals. An average across thirty years can smooth away a single heavy winter, so a small annual figure does not mean a significant snowfall is impossible.
Frost Dates & Growing Season
First Fall Freeze
October 14
50% probability date
Last Spring Freeze
May 2
50% probability date
Growing Season
165 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,638
Higher = more heating needed
Cooling Degree Days
890
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside AZ closest to Saint Johns on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (55°F here).
- Abingdon, VA 55°F · 0.0°F off
- Cottonwood Falls, KS 55°F · 0.0°F off
- Cranford, NJ 55°F · 0.0°F off
- Ellsworth, KS 55°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (9.4" here), excluding temperature-peer places.
- Riverside, CA 9.4" · 0.0" off
- Minden, NV 9.3" · 0.0" off
- St George, UT 9.3" · 0.0" off
- Terlingua, TX 9.3" · 0.0" off
Scarce-water calendar
Where Saint Johns's limited precipitation lands
heating led · dry · mid swing
Saint Johns's energy balance leans toward cold weather: 4,638 annual heating degree days against 890 for cooling. Its 40.8°F seasonal range still makes the monthly rows more useful than the annual average alone.
Saint Johns's frost-free season lasts about 165 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
July and December mark the typical warm and cold ends of the calendar in Saint Johns's middle-range seasonal profile. The measured spread is 40.8°F. The annual average is 55°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Saint Johns's cold-season load does not imply a wet climate. Annual precipitation is 9.4 inches, which places the station in PlainClimate's dry range. Annual snowfall totals 6.2 inches. The snowfall and rainfall fields should be read separately rather than inferred from temperature.
Saint Johns wettest normal
August
August concentrates the scarce annual total (9.4 inches).
Saint Johns driest normal
June
June is typically driest; arid stations are defined by when water is absent, not by a four-season grid.
Questions about Saint Johns's climate
How dry is Saint Johns? ▼
How many days above 90°F does Saint Johns get? ▼
How much energy does heating and cooling require in Saint Johns? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Saint Johns's primary station: SAINT JOHNS (USC00027435). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for Saint Johns; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for Saint Johns comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.