Salt River Bridge · Photo: GaryLordofTrees · CC BY-SA 4.0Rock House reaches 100° on about 81 days a year, more than all but 90 U.S. towns
Midwinter brings lows of about 36°. The gap between a January night and a July afternoon is 68°. By precipitation alone, it ranks drier than 95% of U.S. towns. Warm coats and heating bills mark the months from December to January, when means dip under 50°.
A year in Rock House at a glance
Each month’s typical high and low, and what it brings.
What stands out about Rock House’s climate
Compared with towns across the U.S., with Rock House’s place in Arizona beside it.
What a year in Rock House feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 81 days a year reach 100°
And 150 days reach 90°. Frost and day counts come from NOAA’s station at Roosevelt 1 S, AZ, 10 miles from the town’s center, 390 ft higher.
The 2023 USDA map puts Rock House’s center in zone 9b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 26°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 13 inches of rain a year
August is the wettest month and June the driest. Rain falls on about 45 days a year. Snow is rare: about 0.2" in a normal year at Roosevelt 1 S, AZ, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Rock House
31% of the work is heating, so air conditioning is the bigger bill. Months averaging under 55° run from December through February.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Roosevelt 1 S, AZ.
Living with Rock House’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 9b. Frost comes about 8 winters in 10, so the growing year is set by heat, not cold: 81 days at 100° make midsummer the hard season for gardens.
Months with highs of 62–84° and lows of 40° or more: March, April and November. 2.7 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Rock House from natural hazards, river flooding is the largest share (80%); heat waves, cold waves, winter storms and ice storms together are 2%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Rock House and similar climates
TownRatings has no climate map of the towns around Rock House yet.
Climates most like Rock House’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Rock House, AZ | 36° | 104° | 13" | 0.2" |
| St. George, UT | 33° | 103° | 8" | 1.2" |
| Las Vegas, NV | 35° | 104° | 6" | 0.0" |
| Desert Hot Springs, CA | 42° | 105° | 7" | 0.8" |
| Monahans, TX | 30° | 98° | 12" | 0.7" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Rock House averaged 2.0° warmer than the 1900s. The biggest change is in January (+3.0°).
A bigger shift than in 89% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Rock House compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Rock House’s place among Arizona’s.
Rock House weather by month
Highs, lows and precipitation from NOAA’s grid at Rock House’s center; snow, wet days and snow on the ground from Roosevelt 1 S, AZ. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 63° | 36° | 1.7" | 0.0" | 5 | 0 | 46° – 56° |
| February | 68° | 39° | 1.6" | 0.0" | 5 | 0 | 48° – 59° |
| March | 75° | 44° | 1.4" | 0.2" | 4 | 0 | 52° – 65° |
| April | 83° | 49° | 0.4" | 0.0" | 2 | 0 | 60° – 72° |
| May | 92° | 57° | 0.3" | 0.0" | 2 | 0 | 68° – 79° |
| June | 102° | 66° | 0.1" | 0.0" | 1 | 0 | 78° – 88° |
| July | 104° | 74° | 1.3" | 0.0" | 5 | 0 | 85° – 91° |
| August | 102° | 73° | 1.7" | 0.0" | 6 | 0 | 84° – 91° |
| September | 97° | 66° | 1.0" | 0.0" | 4 | 0 | 77° – 84° |
| October | 86° | 53° | 0.9" | 0.0" | 3 | 0 | 66° – 74° |
| November | 73° | 42° | 0.9" | 0.0" | 3 | 0 | 50° – 65° |
| December | 62° | 35° | 1.5" | 0.0" | 5 | 0 | 45° – 55° |
| Year | 84° | 53° | 12.8" | 0.2" | 45 | 0 |
How much a month can swing
A normal is an average. November swings the most: from 1991 to 2020 its average ranged from 50° to 65°. July is the most reliable, staying within 6°.
Where Rock House’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Rock House’s center.
- Snow: Roosevelt 1 S, AZ.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Roosevelt 1 S, AZ, 10 miles from the town’s center, 390 ft higher; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Rock House’s climate
What is the weather like in Rock House?
A typical July afternoon reaches 104°, a January night drops to 36°, and snow is almost unheard of. Milder January nights than 83% of U.S. towns; hotter July afternoons than all but 84 U.S. towns.
How cold does it get in Rock House in winter?
December nights average 35°. About 9 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 45°.
How much snow does Rock House get?
About 0.2 inches in a normal winter at Roosevelt 1 S, AZ, so most winters see none.
How hot does it get in Rock House?
July, with a typical high of 104° and a low of 74°. About 150 days a year reach 90° and 81 reach 100° (Roosevelt 1 S, AZ).
When is the first and last frost in Rock House?
There is no reliable frost date: a 32° night comes in about 82% of winters at Roosevelt 1 S, AZ, so most years bring a freeze but some pass without one.
What growing zone is Rock House in?
Zone 9b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 26°.
What is the best time of year to visit Rock House?
By one simple rule (highs of 62–84° and lows of 40° or more), March, April and November. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Rock House getting warmer?
Yes: 1991–2020 averaged 2.0° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 89% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Rock House.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.