Photo: Theunderratedtaco · CC BY-SA 4.0Mission reaches 100° on about 40 days a year, more than 98% of U.S. towns
Deep winter brings January lows near 50°. Its January nights stay gentler than in 97% of U.S. towns. Warming shows here too: 1.2° more than in 1901–2000, led by February. Long walks are most pleasant from November to March, when afternoons reach 71–82°.
A year in Mission at a glance
Each month’s typical high and low, and what it brings.
What stands out about Mission’s climate
Compared with towns across the U.S., with Mission’s place in Texas beside it.
What a year in Mission feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 40 days a year reach 100°
And 177 days reach 90°. Day counts come from NOAA’s station at Mcallen Miller International Airport, 5 miles from the city’s center point, at about the same height; frost dates and degree days from Mcallen, TX, 5 miles away.
The 2023 USDA map puts Mission’s center in zone 10a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 32°. Plant labels use the zone; frost dates tell you when to plant.
90° days by month
Average days at 90° or more
About 22 inches of rain a year
September is the wettest month and February the driest. Rain falls on about 43 days a year. Snow is rare: about 0.1" in a normal year at Mcallen, TX, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Mission
12% of the work is heating, so air conditioning is the bigger bill. No month averages under 55°.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Mcallen, TX.
Living with Mission’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 10a. Frost comes about 1 winter in 2, so the growing year is set by heat, not cold: 40 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. 15 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Mission from natural hazards, hurricanes are the largest share (46%); heat waves, cold waves, winter storms and ice storms together are 27%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Mission and its neighbors
Every town next door is within a degree of Mission in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Mission’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 |
|---|---|---|---|---|
| Mission, TX | 50° | 98° | 22" | 0.1" |
| Yucaipa, CA | 41° | 96° | 18" | 0.0" |
| Catalina Foothills, AZ | 39° | 100° | 12" | 0.0" |
| Ivins, UT | 32° | 100° | 11" | 1.2" |
| Sunland Park, NM | 32° | 96° | 9" | 2.0" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Mission averaged 1.2° warmer than the 1900s. The biggest change is in February (+2.0°).
A smaller shift than in 65% 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 Mission compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Mission’s place among Texas’.
Mission weather by month
Highs, lows and precipitation from NOAA’s grid at Mission’s center; snow, wet days and snow on the ground from Mcallen, TX. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 71° | 50° | 0.8" | 0.0" | 3 | 0 | 54° – 66° |
| February | 76° | 54° | 0.8" | 0.0" | 3 | 0 | 57° – 72° |
| March | 82° | 60° | 1.2" | 0.0" | 4 | 0 | 65° – 77° |
| April | 88° | 65° | 1.4" | 0.0" | 4 | 0 | 70° – 81° |
| May | 92° | 72° | 2.2" | 0.0" | 3 | 0 | 77° – 85° |
| June | 97° | 76° | 2.7" | 0.0" | 4 | 0 | 84° – 90° |
| July | 98° | 76° | 2.1" | 0.0" | 3 | 0 | 84° – 91° |
| August | 99° | 76° | 1.8" | 0.0" | 4 | 0 | 86° – 91° |
| September | 94° | 73° | 4.5" | 0.0" | 6 | 0 | 80° – 87° |
| October | 88° | 66° | 2.2" | 0.0" | 4 | 0 | 74° – 81° |
| November | 80° | 57° | 1.2" | 0.0" | 3 | 0 | 63° – 75° |
| December | 73° | 51° | 1.0" | 0.1" | 3 | 0 | 55° – 67° |
| Year | 86° | 65° | 21.9" | 0.1" | 43 | 0 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 57° to 72°. August is the most reliable, staying within 5°.
Where Mission’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 Mission’s center.
- Snow: Mcallen, TX.
- Frost dates, heating and cooling: Mcallen, TX, 5 miles away.
- Freezing nights, 90° and 100° days: Mcallen Miller International Airport, 5 miles from the city’s center point, 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 Mission’s climate
What is the weather like in Mission?
A typical July afternoon reaches 98°, a January night drops to 50°, and snow is almost unheard of. Milder January nights than 97% of U.S. towns; hotter July afternoons than 98% of U.S. towns.
How cold does it get in Mission in winter?
January nights average 50°. A night at 32° or below comes in only some winters (0.8 a year on average). In the coldest January of the last 30 years the month averaged 54°.
How much snow does Mission get?
About 0.1 inches in a normal winter at Mcallen, TX, so most winters see none.
How hot does it get in Mission?
July, with a typical high of 98° and a low of 76°. About 177 days a year reach 90° and 40 reach 100° (Mcallen, TX).
When is the first and last frost in Mission?
Most years have no frost at all: a 32° night comes in about 48% of winters at Mcallen, TX, usually in December or January.
What growing zone is Mission in?
Zone 10a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 32°.
What is the best time of year to visit Mission?
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 Mission getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 65% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Mission.
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.