Photo: Theunderratedtaco · CC BY 4.0Harlingen sits near the top of U.S. towns for mild winters
Sunny July days climb to about 96°. Winter and summer sit 46° apart. Summer afternoons here are warmer than in 96% of U.S. towns. Garden chairs stay out from November to March, the months with highs of 71–81°.
A year in Harlingen at a glance
Each month’s typical high and low, and what it brings.
What stands out about Harlingen’s climate
Compared with towns across the U.S., with Harlingen’s place in Texas beside it.
What a year in Harlingen feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
Frost is rare
Frost and day counts come from NOAA’s station at Harlingen, TX, 1.7 miles from the city’s center point, at about the same height.
The 2023 USDA map puts Harlingen’s center in zone 10a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 33°. 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 25 inches of rain a year
September is the wettest month and February the driest. Rain falls on about 77 days a year. Snow is rare: about 0.1" in a normal year at Harlingen, TX, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Harlingen
11% 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 Harlingen, TX.
Living with Harlingen’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 3, so tender plants can often stay out through winter.
Months with highs of 62–84° and lows of 40° or more: January, February, March, November and December. 27 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Harlingen from natural hazards, hurricanes are the largest share (54%); heat waves, cold waves, winter storms and ice storms together are 22%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Harlingen and its neighbors
Every town next door is within a degree of Harlingen in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Harlingen’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 |
|---|---|---|---|---|
| Harlingen, TX | 51° | 96° | 25" | 0.1" |
| Rancho Cucamonga, CA | 44° | 93° | 20" | 0.0" |
| Corona de Tucson, AZ | 36° | 96° | 14" | 0.1" |
| Waihee-Waiehu, HI | 64° | 89° | 16" | 0.0" |
| Central Point, OR | 32° | 93° | 22" | 3.4" |
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 Harlingen averaged 1.4° warmer than the 1900s. The biggest change is in February (+2.5°).
A bigger shift than in 54% 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 Harlingen compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Harlingen’s place among Texas’.
Harlingen weather by month
Highs, lows and precipitation from NOAA’s grid at Harlingen’s center; snow, wet days and snow on the ground from Harlingen, TX. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 71° | 51° | 1.0" | 0.0" | 8 | 0 | 54° – 67° |
| February | 76° | 55° | 1.0" | 0.0" | 6 | 0 | 58° – 73° |
| March | 81° | 61° | 1.4" | 0.0" | 6 | 0 | 64° – 77° |
| April | 86° | 66° | 1.4" | 0.0" | 5 | 0 | 70° – 80° |
| May | 91° | 72° | 2.2" | 0.0" | 5 | 0 | 76° – 84° |
| June | 95° | 75° | 2.9" | 0.0" | 7 | 0 | 82° – 88° |
| July | 96° | 76° | 2.0" | 0.0" | 5 | 0 | 83° – 88° |
| August | 97° | 76° | 1.9" | 0.0" | 6 | 0 | 84° – 90° |
| September | 92° | 73° | 5.2" | 0.0" | 11 | 0 | 79° – 86° |
| October | 87° | 66° | 3.1" | 0.0" | 6 | 0 | 75° – 81° |
| November | 79° | 58° | 1.6" | 0.0" | 6 | 0 | 63° – 75° |
| December | 73° | 52° | 1.2" | 0.1" | 8 | 0 | 56° – 67° |
| Year | 85° | 65° | 24.9" | 0.1" | 77 | 0 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 58° to 73°. August is the most reliable, staying within 5°.
Where Harlingen’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 Harlingen’s center.
- Snow: Harlingen, TX (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Harlingen, TX, 1.7 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 Harlingen’s climate
What is the weather like in Harlingen?
A typical July afternoon reaches 96°, a January night drops to 51°, and snow is almost unheard of. Milder January nights than 97% of U.S. towns; hotter July afternoons than 96% of U.S. towns.
How cold does it get in Harlingen in winter?
January nights average 51°. About 1 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 54°.
How much snow does Harlingen get?
About 0.1 inches in a normal winter at Harlingen, TX, so most winters see none.
How hot does it get in Harlingen?
July, with a typical high of 96° and a low of 76°. About 151 days a year reach 90° and 9 reach 100° (Harlingen, TX).
When is the first and last frost in Harlingen?
Most years have no frost at all: a 32° night comes in about 31% of winters at Harlingen, TX, usually in December or January.
What growing zone is Harlingen in?
Zone 10a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 33°.
What is the best time of year to visit Harlingen?
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 Harlingen getting warmer?
Yes: 1991–2020 averaged 1.4° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 54% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Harlingen.
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.