Poston reaches 100° on about 126 days a year, more than all but 5 U.S. towns
The depth of winter brings overnight lows near 42°. It is a dry place: less rain and snow fall here than on almost every U.S. town. Warming shows here too: 2.0° more than in 1901–2000, led by January. Long walks are most pleasant from November to March, when afternoons reach 66–80°.
A year in Poston at a glance
Each month’s typical high and low, and what it brings.
What stands out about Poston’s climate
Compared with towns across the U.S., with Poston’s place in Arizona beside it.
What a year in Poston feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 126 days a year reach 100°
And 185 days reach 90°. Frost and day counts come from NOAA’s station at Parker, AZ, 13 miles from the town’s center, at about the same height.
The 2023 USDA map puts Poston’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 4 inches of rain a year
January is the wettest month and June the driest. Rain falls on about 17 days a year. Snow is rare: about 0.0" in a normal year at Parker, AZ, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Poston
19% of the work is heating, so air conditioning is the bigger bill. Months averaging under 55° run from December.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Parker, AZ.
Living with Poston’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 9b. Frost comes about 9 winters in 10, so the growing year is set by heat, not cold: 126 days at 100° make midsummer the hard season for gardens.
Months with highs of 62–84° and lows of 40° or more: January, February, March, November and December.
Parks & trails →Of the yearly building losses FEMA expects in Poston from natural hazards, river flooding is the largest share (79%); heat waves, cold waves, winter storms and ice storms together are 12%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Poston and similar climates
TownRatings has no climate map of the towns around Poston yet.
Climates most like Poston’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 |
|---|---|---|---|---|
| Poston, AZ | 42° | 110° | 4" | 0.0" |
| Moapa Valley, NV | 37° | 108° | 6" | 0.0" |
| Ridgecrest, CA | 34° | 103° | 4" | 0.5" |
| St. George, UT | 33° | 103° | 8" | 1.2" |
| Laredo, TX | 45° | 99° | 20" | 0.1" |
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 Poston averaged 2.0° warmer than the 1900s. The biggest change is in January (+2.8°).
A bigger shift than in 90% 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 Poston compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Poston’s place among Arizona’s.
Poston weather by month
Highs, lows and precipitation from NOAA’s grid at Poston’s center; snow, wet days and snow on the ground from Parker, AZ. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 68° | 42° | 0.7" | 0.0" | 3 | 0 | 51° – 60° |
| February | 73° | 46° | 0.6" | 0.0" | 3 | 0 | 54° – 65° |
| March | 80° | 52° | 0.5" | 0.0" | 2 | 0 | 59° – 73° |
| April | 88° | 58° | 0.1" | 0.0" | 1 | 0 | 67° – 77° |
| May | 97° | 67° | 0.1" | 0.0" | 0 | 0 | 76° – 88° |
| June | 106° | 75° | 0.0" | 0.0" | 0 | 0 | 85° – 95° |
| July | 110° | 83° | 0.3" | 0.0" | 1 | 0 | 92° – 99° |
| August | 109° | 82° | 0.4" | 0.0" | 1 | 0 | 92° – 99° |
| September | 103° | 74° | 0.4" | 0.0" | 1 | 0 | 86° – 92° |
| October | 91° | 61° | 0.2" | 0.0" | 1 | 0 | 72° – 82° |
| November | 77° | 49° | 0.2" | 0.0" | 1 | 0 | 56° – 68° |
| December | 66° | 41° | 0.5" | 0.0" | 2 | 0 | 50° – 58° |
| Year | 89° | 61° | 3.9" | 0.0" | 17 | 0 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 59° to 73°. September is the most reliable, staying within 6°.
Where Poston’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 Poston’s center.
- Snow: Parker, AZ.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Parker, AZ, 13 miles from the town’s center, at about the same height; 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 Poston’s climate
What is the weather like in Poston?
A typical July afternoon reaches 110°, a January night drops to 42°, and snow is almost unheard of. Milder January nights than 91% of U.S. towns; hotter July afternoons than all but 5 U.S. towns.
How cold does it get in Poston in winter?
December nights average 41°. About 4 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 50°.
How much snow does Poston get?
About 0.0 inches in a normal winter at Parker, AZ, so most winters see none.
How hot does it get in Poston?
July, with a typical high of 110° and a low of 83°. About 185 days a year reach 90° and 126 reach 100° (Parker, AZ).
When is the first and last frost in Poston?
There is no reliable frost date: a 32° night comes in about 88% of winters at Parker, AZ, so most years bring a freeze but some pass without one.
What growing zone is Poston 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 Poston?
By one simple rule (highs of 62–84° and lows of 40° or more), January, February, March, November and December. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Poston getting warmer?
Yes: 1991–2020 averaged 2.0° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 90% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Poston.
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.