Average Weather in January in Harper Texas, United States
Daily high temperatures increase by 2°F, from 58°F to 61°F, rarely falling below 43°F or exceeding 74°F. The lowest daily average high temperature is 58°F on January 4.
Daily low temperatures are around 36°F, rarely falling below 24°F or exceeding 51°F. The lowest daily average low temperature is 35°F on January 6.
For reference, on August 3, the hottest day of the year, temperatures in Harper typically range from 70°F to 92°F, while on January 6, the coldest day of the year, they range from 35°F to 58°F.
Average High and Low Temperature in January
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on January. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in January
The month of January in Harper experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 44% throughout the month. The highest chance of overcast or mostly cloudy conditions is 45% on January 3.
The clearest day of the month is January 23, with clear, mostly clear, or partly cloudy conditions 57% of the time.
For reference, on January 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 45%, while on June 15, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 74%.
Cloud Cover Categories in January
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Harper, the chance of a wet day over the course of January is essentially constant, remaining around 13% throughout.
For reference, the year's highest daily chance of a wet day is 33% on May 27, and its lowest chance is 12% on December 28.
Over the course of January in Harper, the chance of a day with only rain remains an essentially constant 11% throughout, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 1% throughout.
Probability of Precipitation in January
The average sliding 31-day rainfall during January in Harper is essentially constant, remaining about 1.2 inches throughout, and rarely exceeding 3.1 inches.
The lowest average 31-day accumulation is 1.1 inches on January 15.
Average Monthly Rainfall in January
Over the course of January in Harper, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 31 minutes, implying an average daily increase of 1 minute, 2 seconds, and weekly increase of 7 minutes, 11 seconds.
The shortest day of the month is January 1, with 10 hours, 14 minutes of daylight and the longest day is January 31, with 10 hours, 45 minutes of daylight.
Hours of Daylight and Twilight in January
The latest sunrise of the month in Harper is 7:34 AM on January 9 and the earliest sunrise is 7 minutes earlier at 7:28 AM on January 31.
The earliest sunset is 5:47 PM on January 1 and the latest sunset is 25 minutes later at 6:13 PM on January 31.
Daylight saving time is observed in Harper during 2021, but it neither starts nor ends during January, so the entire month is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 6:35 AM and sets 14 hours, 6 minutes later, at 8:41 PM, while on December 21, the shortest day of the year, it rises at 7:29 AM and sets 10 hours, 12 minutes later, at 5:41 PM.
Sunrise & Sunset with Twilight in January
The figure below presents a compact representation of key lunar data for January 2021. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
Moon Rise, Set & Phases in January
The chance that a given day will be muggy in Harper is essentially constant during January, remaining around 0% throughout.
For reference, on June 24, the muggiest day of the year, there are muggy conditions 58% of the time, while on January 20, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in January
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Harper is essentially constant during January, remaining within 0.2 miles per hour of 10.3 miles per hour throughout.
For reference, on April 2, the windiest day of the year, the daily average wind speed is 11.9 miles per hour, while on September 10, the calmest day of the year, the daily average wind speed is 8.7 miles per hour.
The lowest daily average wind speed during January is 10.1 miles per hour on January 8.
Average Wind Speed in January
The hourly average wind direction in Harper throughout January is predominantly from the south, with a peak proportion of 41% on January 31.
Wind Direction in January
The growing season in Harper typically lasts for 7.8 months (240 days), from around March 18 to around November 12, rarely starting before February 21 or after April 15, and rarely ending before October 22 or after December 4.
The month of January in Harper is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in January
The average accumulated growing degree days in Harper are gradually increasing during January, increasing by 101°F, from 0°F to 101°F, over the course of the month.
Growing Degree Days in January
The average daily incident shortwave solar energy in Harper is gradually increasing during January, rising by 0.6 kWh, from 3.3 kWh to 3.9 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in January
For the purposes of this report, the geographical coordinates of Harper are 30.300 deg latitude, -99.244 deg longitude, and 2,051 ft elevation.
The topography within 2 miles of Harper contains only modest variations in elevation, with a maximum elevation change of 230 feet and an average elevation above sea level of 2,073 feet. Within 10 miles contains only modest variations in elevation (545 feet). Within 50 miles contains significant variations in elevation (1,565 feet).
The area within 2 miles of Harper is covered by grassland (58%) and shrubs (42%), within 10 miles by shrubs (52%) and grassland (44%), and within 50 miles by shrubs (56%) and grassland (28%).
This report illustrates the typical weather in Harper, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Harper.
For each station, the records are corrected for the elevation difference between that station and Harper according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Harper is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Harper and a given station.
The stations contributing to this reconstruction are: Gillespie County Airport (40%, 33 kilometers, east); Vamc Heliport (32%, 39 kilometers, southeast); Kimble County Airport (20%, 55 kilometers, northwest); and Brady Curtis Field (8%, 98 kilometers, north).
Time zones for airports and weather stations are provided by AskGeo.com .