Alamo Lake reaches 100° on about 122 days a year, more than all but 12 U.S. towns
The coldest hours of a January night bottom out at 38° on average. August is the wettest month here, with about 24 times the rain of June. By precipitation alone, it ranks drier than almost every U.S. town. Plan time outside for February, March and November, when highs sit at 70–78°.
A year in Alamo Lake at a glance
Each month’s typical high and low, and what it brings.
What stands out about Alamo Lake’s climate
Compared with towns across the U.S., with Alamo Lake’s place in Arizona beside it.
What a year in Alamo Lake feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 261 frost-free days a year
In half of years the last 32° night comes by March 4 and the first by November 23. Frost and day counts come from NOAA’s station at Alamo Dam, AZ, 5 miles from the town’s center, at about the same height.
The 2023 USDA map puts Alamo Lake’s center in zone 9a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 24°. 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 6 inches of rain a year
August is the wettest month and June the driest. Rain falls on about 31 days a year. Snow is rare: about 0.0" in a normal year at Alamo Dam, AZ, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Alamo Lake
36% of the work is heating, so air conditioning is the bigger bill. Months averaging under 55°: December and January.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Alamo Dam, AZ.
Living with Alamo Lake’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
261 frost-free days in zone 9a. The last frost comes by Mar 4 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 23.
Months with highs of 62–84° and lows of 40° or more: February, March and November. 25 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Alamo Lake from natural hazards, river flooding is the largest share (86%); heat waves, cold waves, winter storms and ice storms together are 7%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Alamo Lake and similar climates
TownRatings has no climate map of the towns around Alamo Lake yet.
Climates most like Alamo Lake’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 |
|---|---|---|---|---|
| Alamo Lake, AZ | 38° | 108° | 6" | 0.0" |
| Moapa Valley, NV | 37° | 108° | 6" | 0.0" |
| Mecca, CA | 43° | 108° | 3" | 0.0" |
| St. George, UT | 33° | 103° | 8" | 1.2" |
| 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 Alamo Lake averaged 1.8° warmer than the 1900s. The biggest change is in March (+2.7°).
A bigger shift than in 81% 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 Alamo Lake compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Alamo Lake’s place among Arizona’s.
Alamo Lake weather by month
Highs, lows and precipitation from NOAA’s grid at Alamo Lake’s center; snow, wet days and snow on the ground from Alamo Dam, AZ. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 67° | 38° | 0.8" | 0.0" | 4 | 0 | 48° – 59° |
| February | 70° | 41° | 0.9" | 0.0" | 4 | 0 | 48° – 62° |
| March | 78° | 46° | 0.6" | 0.0" | 3 | 0 | 55° – 69° |
| April | 85° | 52° | 0.2" | 0.0" | 2 | 0 | 63° – 73° |
| May | 94° | 61° | 0.1" | 0.0" | 1 | 0 | 71° – 83° |
| June | 104° | 69° | 0.0" | 0.0" | 0 | 0 | 81° – 91° |
| July | 108° | 77° | 0.7" | 0.0" | 3 | 0 | 89° – 95° |
| August | 106° | 77° | 1.0" | 0.0" | 5 | 0 | 88° – 96° |
| September | 100° | 69° | 0.5" | 0.0" | 3 | 0 | 82° – 88° |
| October | 89° | 56° | 0.5" | 0.0" | 2 | 0 | 68° – 78° |
| November | 76° | 45° | 0.4" | 0.0" | 2 | 0 | 53° – 66° |
| December | 65° | 37° | 0.7" | 0.0" | 3 | 0 | 47° – 57° |
| Year | 87° | 56° | 6.4" | 0.0" | 31 | 0 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 48° to 62°. September is the most reliable, staying within 6°.
Where Alamo Lake’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 Alamo Lake’s center.
- Snow: Alamo Dam, AZ.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Alamo Dam, AZ, 5 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 Alamo Lake’s climate
What is the weather like in Alamo Lake?
A typical July afternoon reaches 108°, a January night drops to 38°, and snow is almost unheard of. Milder January nights than 85% of U.S. towns; hotter July afternoons than all but 14 U.S. towns.
How cold does it get in Alamo Lake in winter?
December nights average 37°. About 28 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 47°.
How much snow does Alamo Lake get?
About 0.0 inches in a normal winter at Alamo Dam, AZ, so most winters see none.
How hot does it get in Alamo Lake?
July, with a typical high of 108° and a low of 77°. About 179 days a year reach 90° and 122 reach 100° (Alamo Dam, AZ).
When is the first and last frost in Alamo Lake?
In half of years the last spring frost (32°) comes by March 4 and the first fall frost by November 23, about 261 frost-free days, at Alamo Dam, AZ.
What growing zone is Alamo Lake in?
Zone 9a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 24°.
What is the best time of year to visit Alamo Lake?
By one simple rule (highs of 62–84° and lows of 40° or more), February, March and November. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Alamo Lake getting warmer?
Yes: 1991–2020 averaged 1.8° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 81% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Alamo Lake.
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.