Jerome, Arizona climate: Normal weather by month, frost dates and records
Jerome's normal year runs from 34°F December nights to 91°F July afternoons, with 17.7 inches of precipitation and 6 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 15.6°C, December lows of 1°C, July highs of 33°C, 450 mm of precipitation a year.
- NOAA stationJerome
- Station IDUSC00024453
- Location34.75°N 112.11°W
- Elevation4,950 ft (1,509 m)
- From the centerunder 1 mile
- Population457
On October 23, the normal high in Jerome is 68°F and the normal low 50°F, and the chance of measurable rain or snow is 13%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Jerome.
- Jan 50° 35°
- Feb 53° 36°
- Mar 61° 41°
- Apr 68° 46°
- May 78° 55°
- Jun 89° 66°
- Jul 91° 69°
- Aug 88° 67°
- Sep 82° 62°
- Oct 71° 53°
- Nov 59° 42°
- Dec 49° 34°
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 Jerome each month?
July is the warmest month, with normal highs of 91°F; December the coldest, with normal lows of 34°F. The most precipitation falls in August (3.04 in), the least in June (0.32 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 50°F | 35°F | 42.0°F | 1.77 | 1.7 | 6 | <1 | 10 | 10 h |
| February | 53°F | 36°F | 44.8°F | 1.82 | 1.0 | 6 | <1 | 7 | 10 h 50 min |
| March | 61°F | 41°F | 50.7°F | 1.66 | 1.4 | 6 | <1 | 4 | 11 h 50 min |
| April | 68°F | 46°F | 57.3°F | 0.72 | 1.4 | 4 | <1 | 1 | 13 h |
| May | 78°F | 55°F | 66.2°F | 0.51 | 0.0 | 3 | 2 | <1 | 14 h |
| June | 89°F | 66°F | 77.2°F | 0.32 | 0.0 | 2 | 16 | <1 | 14 h 30 min |
| July | 91°F | 69°F | 79.9°F | 2.37 | 0.0 | 9 | 21 | <1 | 14 h 20 min |
| August | 88°F | 67°F | 77.4°F | 3.04 | 0.0 | 11 | 14 | <1 | 13 h 30 min |
| September | 82°F | 62°F | 72.2°F | 1.64 | 0.0 | 6 | 3 | <1 | 12 h 30 min |
| October | 71°F | 53°F | 62.0°F | 1.30 | 0.0 | 4 | <1 | 1 | 11 h 20 min |
| November | 59°F | 42°F | 50.2°F | 0.87 | 0.1 | 4 | <1 | 3 | 10 h 20 min |
| December | 49°F | 34°F | 41.5°F | 1.69 | 0.7 | 5 | <1 | 10 | 9 h 50 min |
| Year (annual) | 70°F | 50°F | 60.1°F | 17.71 | 6.3 | 64 | 55 | 36 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 10°C | 1°C | 5.6°C | 45 mm | 4 cm |
| February | 12°C | 2°C | 7.1°C | 46 mm | 3 cm |
| March | 16°C | 5°C | 10.4°C | 42 mm | 4 cm |
| April | 20°C | 8°C | 14.1°C | 18 mm | 4 cm |
| May | 25°C | 13°C | 19.0°C | 13 mm | 0 cm |
| June | 32°C | 19°C | 25.1°C | 8 mm | 0 cm |
| July | 33°C | 20°C | 26.6°C | 60 mm | 0 cm |
| August | 31°C | 19°C | 25.2°C | 77 mm | 0 cm |
| September | 28°C | 17°C | 22.3°C | 42 mm | 0 cm |
| October | 22°C | 12°C | 16.7°C | 33 mm | 0 cm |
| November | 15°C | 6°C | 10.1°C | 22 mm | 0 cm |
| December | 9°C | 1°C | 5.3°C | 43 mm | 2 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00024453; 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 Jerome?
Normal highs sit between 65°F and 85°F in April, May, September and October. Of those, May has the fewest days with rain (3).
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 USC00024453.
When is the last frost in Jerome?
In Jerome, the last spring frost (32°F) comes after March 26 in half of years and after April 19 in one year in ten; the first autumn frost comes before November 25 in half of years and before November 4 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
- March 261 year in 10 after April 19; 9 in 10 after February 28
- First autumn frost, half of years before
- November 251 year in 10 before November 4; 9 in 10 before December 10
NOAA puts the median frost-free season at 242 days, and the season without a hard freeze (28°F) at 277 days.
A hard freeze (28°F) comes after March 1 in half of springs and before December 6 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Jerome in zone 8b in ZIP code 86331. By the map's own method, the average of each year's coldest night over 1991-2020, Jerome's NOAA station is in zone 9a: the coldest night of a typical year reaches 21°F (25 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 USC00024453; 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 in Jerome?
In a normal year in Jerome, 55 days a year reach 90°F (3 of them 100°F or more), 36 nights fall to 32°F or colder and 64 days bring measurable precipitation.
- Days at 90°F or more
- 55a normal year
- Days at 100°F or more
- 3a normal year
- Nights at 32°F or colder
- 36a normal year
- Days that stay below freezing
- 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 64a normal year
- Days with 1 inch of snow or more
- 2a normal year
The highest temperature in this station's record (since 1897) is 108°F, on June 21, 2016; the lowest is 5°F, on January 13, 1963.
The wettest calendar year on that record is 1941, with 30.74 in; the snowiest season is 1943–44, with 70.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00024453; records: ACIS (NOAA Regional Climate Centers), station USC00024453. Records use complete months only; a month missing more than three days is left out.
How sunny is Jerome?
Over a year 89% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Jerome, 5.7 kWh per square metre a day. June is the sunniest month (95%) and December the cloudiest (82%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 84% | 3.3 |
| February | 83% | 4.2 |
| March | 87% | 5.7 |
| April | 90% | 7.1 |
| May | 92% | 8.1 |
| June | 95% | 8.6 |
| July | 86% | 7.2 |
| August | 87% | 6.7 |
| September | 90% | 6.0 |
| October | 91% | 4.9 |
| November | 89% | 3.7 |
| December | 82% | 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 much heating and cooling does Jerome need?
A normal year in Jerome brings 3,391 heating degree days, 37% fewer than the median U.S. place (5,373), and 1,639 cooling degree days, 81% 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 4,653 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 711 | 0 |
| February | 567 | 0 |
| March | 443 | 1 |
| April | 246 | 15 |
| May | 88 | 125 |
| June | 5 | 373 |
| July | 0 | 462 |
| August | 1 | 385 |
| September | 11 | 227 |
| October | 145 | 51 |
| November | 444 | 1 |
| December | 730 | 0 |
| Year (annual) | 3,391 | 1,639 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00024453. 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 Jerome been warmer than normal lately?
Over 65 complete years from 1898 to 2021, the station's annual mean temperature rose at a fitted 2.7°F per century (+0.15°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Jerome's climate compare?
Jerome is warmer than 29 of the other 96 places with their own NOAA record in Arizona, and wetter than 75. Across the 7,247 U.S. stations with normals, its annual mean of 60.1°F is warmer than 75%.
In the Köppen classification computed from these normals, Jerome 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.
Questions about Jerome's climate
What is the coldest month in Jerome?
December, with a normal high of 49°F and a normal low of 34°F. The warmest is July (91°F by day, 69°F at night).
Does it snow in Jerome?
Yes: 6 inches in a normal year, falling on 3 days with 0.1 inch or more, the most in January (1.7 inches).
What is the rainiest month in Jerome?
August, with 3.04 in of precipitation in a normal year; the driest is June with 0.32 in.
What plant hardiness zone is Jerome in?
The USDA's 2023 map puts Jerome in zone 8b in ZIP code 86331. By the same method at Jerome's NOAA station, the coldest night of a typical year reaches 21°F (25 years, 1991-2020): zone 9a.
How late can frost come in Jerome?
In half of years the last 32°F night comes after March 26; in one year in ten it comes after April 19. Waiting until April 19 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Arizona climateThe statewide normals and every place in the state
- Cottonwood, AZ5 miles from this station, 63.5°F a year
- Camp Verde, AZ19 miles from this station, 61.6°F a year
- Prescott, AZ19 miles from this station, 56.7°F a year
- Chino Valley, AZ20 miles from this station, 57.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made