Climate Comfort Score
89/100
Excellent
NOAA 1991–2020 normals 74°F annual avg Public-domain federal data
Port Isabel, TX Climate
Pulled from NOAA NCEI 1991–2020 normals →: average temperature, precipitation, and comfort score
- 74°F
- Avg annual temp
- 89/100
- Comfort score
- 28.8"
- Annual precip
- -2d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Port Isabel
Port Isabel, Texas averages 74°F a year and scores 89/100 on the comfort index - excellent, milder than 93% of U.S. cities.
- 74°F
- average temperature, NOAA 1991-2020 normal
- 89/100
- comfort score, milder than 93% of U.S. cities
- 28.8"
- yearly precipitation total
- -2 days
- frost-free growing season
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
74°F (23°C)
Avg High
82°F
Avg Low
66°F
Annual Precip
28.8"
Annual Snow
0.2"
Comfort Score
89/100
Excellent
Avg Annual Temperature
74°F
30-year mean (NOAA NCEI)
Annual Precipitation
28.8"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Port Isabel) 89.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Excellent for the Port Isabel area.
How Port Isabel compares to every U.S. city
Port Isabel's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
89 Top 7% higher than 93% of 6,915 US cities
Each bar is a band; taller bars hold more US cities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Warming context for Port Isabel
MethodologyZooming out from Port Isabel's own normal, the chart below shows how the U.S. land temperature anomaly has tracked the global mean since 1900 - the most recent decade sits warmer than the 30-year mean shown here.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 69°F (21°C) | 52°F (11°C) | 60°F (16°C) | 1.4" | 0.0" | 0.2 | 0.0 |
| February | 72°F (22°C) | 56°F (13°C) | 64°F (18°C) | 1.2" | 0.0" | 0.3 | 0.1 |
| March | 76°F (24°C) | 61°F (16°C) | 68°F (20°C) | 1.7" | 0.0" | 0.1 | 0.5 |
| April | 81°F (27°C) | 67°F (19°C) | 74°F (23°C) | 1.6" | 0.0" | 0.0 | 0.8 |
| May | 86°F (30°C) | 73°F (23°C) | 79°F (26°C) | 2.4" | 0.0" | 0.0 | 5.5 |
| June | 90°F (32°C) | 76°F (25°C) | 83°F (28°C) | 3.1" | 0.0" | 0.0 | 18.7 |
| July | 91°F (33°C) | 77°F (25°C) | 84°F (29°C) | 2.3" | 0.0" | 0.0 | 22.9 |
| August | 92°F (33°C) | 77°F (25°C) | 85°F (29°C) | 1.9" | 0.0" | 0.0 | 26.6 |
| September | 89°F (31°C) | 74°F (23°C) | 81°F (27°C) | 6.2" | 0.0" | 0.0 | 15.1 |
| October | 85°F (30°C) | 69°F (21°C) | 77°F (25°C) | 3.9" | 0.0" | 0.0 | 4.8 |
| November | 78°F (25°C) | 61°F (16°C) | 69°F (21°C) | 1.8" | 0.0" | 0.1 | 0.0 |
| December | 71°F (21°C) | 54°F (12°C) | 62°F (17°C) | 1.4" | 0.2" | 0.1 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 1.4"
7.9 days with precipitation
February 1.2"
5.2 days with precipitation
March 1.7"
4.8 days with precipitation
April 1.6"
3.6 days with precipitation
May 2.4"
4.0 days with precipitation
June 3.1"
4.0 days with precipitation
July 2.3"
3.6 days with precipitation
August 1.9"
4.4 days with precipitation
September 6.2"
8.3 days with precipitation
October 3.9"
7.3 days with precipitation
November 1.8"
5.8 days with precipitation
December 1.4"
Snow: 0.2"
7.7 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
January 1
50% probability date
Last Spring Freeze
January 3
50% probability date
Growing Season
-2 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
551
Higher = more heating needed
Cooling Degree Days
3,837
Higher = more cooling needed
Warmest Month
August
Coldest Month
January
What Port Isabel's climate means for you
Port Isabel runs 74°F a year - peaking in August, coldest in January.
- Gardeners get about -2 frost-free days, with the last spring freeze near January 3 - plan the planting calendar around it, not the regional average.
- Energy bills track 551 heating and 3,837 cooling degree days a year, higher means the furnace or AC runs more.
- Comparing places to live? Line this city up against nearby cities and the national rankings. See rankings
These are 30-year NOAA normals (1991–2020) - the typical year, not a forecast for any specific season.
Climate Guides
Climate Insight: Port Isabel, TX
The NOAA 1991–2020 climate normals describe Port Isabel, Texas as a location with an annual average temperature of 74°F, ranging from a mean daily high of 82°F to a mean daily low of 66°F. August is typically the warmest month of the year, while January is the coldest. These thirty-year averages, computed from station USC00417179, smooth out year-to-year variability and give a baseline expectation for typical conditions in any given month.
Rainfall (and snow, where it falls) shapes day-to-day life here as much as temperature does. Port Isabel sees about 28.8 inches of precipitation a year, with negligible snowfall. The frost-free season averages -2 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near January 3 and the first fall freeze near January 1. On the energy side, 551 heating degree days and 3,837 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Port Isabel scores 89/100 (Excellent), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above turn that into a planning tool: expect the mildest highs and lows in the shoulder seasons, August-driven heat at the peak of summer, and January-driven cold at the depth of winter. Every number here is a thirty-year average, not a forecast, so any given year can and does run warmer, cooler, wetter, or drier than the normal.
Frequently Asked Questions
What is the average temperature in Port Isabel, TX? ▼
The average annual temperature in Port Isabel, Texas is 74°F. The warmest month averages 92°F (33°C) and the coldest averages 52°F (11°C).
How much rain does Port Isabel get? ▼
Port Isabel receives 28.8 inches of precipitation annually, including 0.2 inches of snow. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Port Isabel? ▼
Port Isabel has a climate comfort score of 89/100 (Excellent), milder than 93% of U.S. cities in the PlainClimate database.
When is the growing season in Port Isabel? ▼
Port Isabel has approximately -2 frost-free days per year, with the last spring freeze around January 3 and the first fall freeze around January 1.
How much energy does heating and cooling require in Port Isabel? ▼
Port Isabel has 551 heating degree days and 3,837 cooling degree days annually, a cooling-dominated climate. See our <a href="/guides/reading-weather-data/" class="underline hover:text-brand-600">guide to reading weather data</a> for what these figures mean.
Where does this Port Isabel climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00417179 near Port Isabel.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00417179. For informational purposes only.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. This page draws directly on NOAA 1991-2020 U.S. Climate Normals data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.