Blanco, Texas climate: Normal weather by month, frost dates and records
Blanco's normal year runs from 35°F January nights to 94°F August afternoons, with 34.8 inches of precipitation and less than an inch of snow (0.1 in) a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 18.6°C, January lows of 2°C, August highs of 35°C, 884 mm of precipitation a year.
- NOAA stationBlanco
- Station IDUSC00410832
- Location30.09°N 98.41°W
- Elevation1,310 ft (399 m)
- Population2,077
On October 23, the normal high in Blanco is 77°F and the normal low 52°F, and the chance of measurable rain or snow is 21%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Blanco.
- Jan 60° 35°
- Feb 64° 39°
- Mar 70° 46°
- Apr 77° 53°
- May 83° 62°
- Jun 90° 68°
- Jul 93° 71°
- Aug 94° 70°
- Sep 88° 64°
- Oct 79° 55°
- Nov 68° 45°
- Dec 61° 37°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Blanco each month?
August is the warmest month, with normal highs of 94°F; January the coldest, with normal lows of 35°F. The most precipitation falls in May (4.95 in), the least in July (1.84 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 60°F | 35°F | 47.5°F | 2.32 | 7 | <1 | 14 | 10 h 20 min |
| February | 64°F | 39°F | 51.3°F | 1.93 | 7 | <1 | 9 | 11 h 10 min |
| March | 70°F | 46°F | 58.2°F | 2.86 | 8 | <1 | 4 | 12 h |
| April | 77°F | 53°F | 65.0°F | 2.77 | 7 | 1 | 1 | 12 h 50 min |
| May | 83°F | 62°F | 72.6°F | 4.95 | 8 | 6 | <1 | 13 h 40 min |
| June | 90°F | 68°F | 79.1°F | 3.21 | 6 | 18 | <1 | 14 h |
| July | 93°F | 71°F | 81.8°F | 1.84 | 4 | 26 | <1 | 14 h |
| August | 94°F | 70°F | 82.0°F | 2.12 | 5 | 27 | <1 | 13 h 20 min |
| September | 88°F | 64°F | 76.0°F | 3.72 | 6 | 15 | <1 | 12 h 20 min |
| October | 79°F | 55°F | 66.8°F | 3.96 | 6 | 2 | <1 | 11 h 30 min |
| November | 68°F | 45°F | 56.5°F | 2.90 | 6 | <1 | 5 | 10 h 40 min |
| December | 61°F | 37°F | 49.3°F | 2.23 | 7 | <1 | 12 | 10 h 10 min |
| Year (annual) | 77°F | 54°F | 65.5°F | 34.81 | 76 | 96 | 44 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 15°C | 2°C | 8.6°C | 59 mm |
| February | 18°C | 4°C | 10.7°C | 49 mm |
| March | 21°C | 8°C | 14.6°C | 73 mm |
| April | 25°C | 11°C | 18.3°C | 70 mm |
| May | 29°C | 17°C | 22.6°C | 126 mm |
| June | 32°C | 20°C | 26.2°C | 82 mm |
| July | 34°C | 21°C | 27.7°C | 47 mm |
| August | 35°C | 21°C | 27.8°C | 54 mm |
| September | 31°C | 18°C | 24.4°C | 94 mm |
| October | 26°C | 13°C | 19.3°C | 101 mm |
| November | 20°C | 7°C | 13.6°C | 74 mm |
| December | 16°C | 3°C | 9.6°C | 57 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00410832; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Blanco?
Normal highs sit between 65°F and 85°F in March, April, May, October and November. Of those, October has the fewest days with rain (6).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00410832.
When is the last frost in Blanco?
In Blanco, the last spring frost (32°F) comes after March 20 in half of years and after April 8 in one year in ten; the first autumn frost comes before November 10 in half of years and before October 27 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- March 201 year in 10 after April 8; 9 in 10 after February 28
- First autumn frost, half of years before
- November 101 year in 10 before October 27; 9 in 10 before December 2
NOAA puts the median frost-free season at 236 days, and the season without a hard freeze (28°F) at 262 days.
A hard freeze (28°F) comes after March 6 in half of springs and before November 23 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Blanco in zone 8b in ZIP code 78606, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Blanco's NOAA station is in zone 8b: the coldest night of a typical year reaches 17°F (23 complete years).
Frost dates for every NOAA station in Texas · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00410832; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Blanco?
In a normal year in Blanco, 96 days a year reach 90°F (9 of them 100°F or more), 44 nights fall to 32°F or colder and 76 days bring measurable precipitation.
- Days at 90°F or more
- 96a normal year
- Days at 100°F or more
- 9a normal year
- Nights at 32°F or colder
- 44a normal year
- Days that stay below freezing
- 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 76a normal year
The highest temperature in this station's record (since 1896) is 110°F, on July 19, 1914; the lowest is −6°F, on January 31, 1949.
The wettest calendar year on that record is 1952, with 53.67 in; the snowiest season is 1943–44, with 11.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00410832; records: ACIS (NOAA Regional Climate Centers), station USC00410832. Records use complete months only; a month missing more than three days is left out.
How sunny is Blanco?
Over a year 79% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Blanco, 4.9 kWh per square metre a day. August is the sunniest month (88%) and February the cloudiest (72%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 75% | 3.2 |
| February | 72% | 3.8 |
| March | 73% | 4.7 |
| April | 76% | 5.6 |
| May | 76% | 6.0 |
| June | 85% | 6.8 |
| July | 86% | 6.8 |
| August | 88% | 6.4 |
| September | 81% | 5.2 |
| October | 81% | 4.4 |
| November | 77% | 3.3 |
| December | 74% | 2.9 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Blanco need?
A normal year in Blanco brings 2,145 heating degree days, 60% fewer than the median U.S. place (5,373), and 2,351 cooling degree days, 2.6 times the median (908). Three months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 6,141 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 545 | 2 |
| February | 392 | 7 |
| March | 244 | 31 |
| April | 92 | 92 |
| May | 14 | 248 |
| June | 0 | 422 |
| July | 0 | 519 |
| August | 0 | 527 |
| September | 5 | 335 |
| October | 80 | 137 |
| November | 281 | 26 |
| December | 492 | 4 |
| Year (annual) | 2,145 | 2,351 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00410832. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Blanco been warmer than normal lately?
Over 80 complete years from 1905 to 2019, the station's annual mean temperature rose at a fitted 0.3°F per century (+0.02°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Blanco's climate compare?
Blanco is warmer than 152 of the other 320 places with their own NOAA record in Texas, and wetter than 183. Across the 7,247 U.S. stations with normals, its annual mean of 65.5°F is warmer than 89%.
In the Köppen classification computed from these normals, Blanco is Cfa: temperate, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Questions about Blanco's climate
What is the coldest month in Blanco?
January, with a normal high of 60°F and a normal low of 35°F. The warmest is August (94°F by day, 70°F at night).
Does it snow in Blanco?
Rarely: NOAA's normal is 0.1 inch a year.
What is the rainiest month in Blanco?
May, with 4.95 in of precipitation in a normal year; the driest is July with 1.84 in.
What plant hardiness zone is Blanco in?
The USDA's 2023 map puts Blanco in zone 8b in ZIP code 78606, the nearest ZIP area. By the same method at Blanco's NOAA station, the coldest night of a typical year reaches 17°F (23 years, 1991-2020): zone 8b.
How late can frost come in Blanco?
In half of years the last 32°F night comes after March 20; in one year in ten it comes after April 8. Waiting until April 8 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Texas climateThe statewide normals and every place in the state
- Johnson City, TX14 miles from this station, 67.0°F a year
- Canyon Lake, TX21 miles from this station, 68.1°F a year
- Dripping Springs, TX27 miles from this station, 67.4°F a year
- Boerne, TX28 miles from this station, 66.5°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made