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Average Weather in January in Bylas Arizona, United States

Daily high temperatures increase by 3°F, from 60°F to 63°F, rarely falling below 51°F or exceeding 72°F.

Daily low temperatures are around 38°F, rarely falling below 29°F or exceeding 47°F. The lowest daily average low temperature is 37°F on January 4.

For reference, on June 29, the hottest day of the year, temperatures in Bylas typically range from 73°F to 100°F, while on January 4, the coldest day of the year, they range from 37°F to 60°F.

Average High and Low Temperature in January

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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

Average Hourly Temperature in January in Bylas18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM4 AM8 AM12 PM4 PM8 PM12 AMDecFebvery coldcoldcoldcoldcoolvery cold
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Ouarzazat, Morocco (5,763 miles away) and Qurayyat, Saudi Arabia (7,511 miles) are the far-away foreign places with temperatures most similar to Bylas (view comparison).


The month of January in Bylas experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 36% throughout the month.

The clearest day of the month is January 22, with clear, mostly clear, or partly cloudy conditions 65% of the time.

For reference, on July 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 45%, while on September 28, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 83%.

Cloud Cover Categories in January

Cloud Cover Categories in January in Bylas1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%DecFebJan 164%Jan 164%Jan 3163%Jan 3163%Jan 1164%Jan 1164%Jan 2165%Jan 2165%clearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.


A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Bylas, 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 39% on August 4, and its lowest chance is 3% on June 9.

Probability of Precipitation in January

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).


To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during January in Bylas is essentially constant, remaining about 1.3 inches throughout, and rarely exceeding 3.2 inches.

The highest average 31-day accumulation is 1.3 inches on January 5.

Average Monthly Rainfall in January

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.


Over the course of January in Bylas, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 34 minutes, implying an average daily increase of 1 minute, 9 seconds, and weekly increase of 8 minutes, 1 second.

The shortest day of the month is January 1, with 10 hours, 1 minute of daylight and the longest day is January 31, with 10 hours, 35 minutes of daylight.

Hours of Daylight and Twilight in January

Hours of Daylight and Twilight in January in Bylas1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrDecFebnightnightdaydayJan 110 hr, 1 minJan 110 hr, 1 minJan 3110 hr, 35 minJan 3110 hr, 35 min
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The latest sunrise of the month in Bylas is 7:24 AM on January 8 and the earliest sunrise is 8 minutes earlier at 7:16 AM on January 31.

The earliest sunset is 5:24 PM on January 1 and the latest sunset is 27 minutes later at 5:51 PM on January 31.

Daylight saving time is not observed in Bylas during 2018.

For reference, on June 21, the longest day of the year, the Sun rises at 5:11 AM and sets 14 hours, 21 minutes later, at 7:32 PM, while on December 21, the shortest day of the year, it rises at 7:19 AM and sets 9 hours, 58 minutes later, at 5:17 PM.

Sunrise & Sunset with Twilight in January

The solar day over the course of January. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.


We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Bylas is essentially constant during January, remaining around 0% throughout.

For reference, on August 4, the muggiest day of the year, there are muggy conditions 8% of the time, while on October 10, 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 percentage of time spent at various humidity comfort levels, categorized by dew point.


This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Bylas is essentially constant during January, remaining within 0.1 miles per hour of 7.1 miles per hour throughout.

For reference, on April 22, the windiest day of the year, the daily average wind speed is 8.3 miles per hour, while on August 16, the calmest day of the year, the daily average wind speed is 5.7 miles per hour.

Average Wind Speed in January

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The hourly average wind direction in Bylas throughout January is predominantly from the east, with a peak proportion of 50% on January 7.

Wind Direction in January

Wind Direction in January in BylasEW1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%DecFebwesteastnorthsouth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Growing Season

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Bylas typically lasts for 9.3 months (284 days), from around February 19 to around November 29, rarely starting before January 7 or after March 17, and rarely ending before November 12 or after December 18.

The month of January in Bylas is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season increasing from 8% to 25% over the course of the month.

Time Spent in Various Temperature Bands and the Growing Season in January

Time Spent in Various Temperature Bands and the Growing Season in January in Bylas1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%DecFebJan 18%Jan 18%Jan 3125%Jan 3125%Jan 1112%Jan 1112%Jan 2118%Jan 2118%50%Feb 1950%Feb 19very coldcoldcoolcomfortable
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Bylas are gradually increasing during January, increasing by 98°F, from 0°F to 98°F, over the course of the month.

Growing Degree Days in January

The average growing degree days accumulated over the course of January, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in Bylas is gradually increasing during January, rising by 0.7 kWh, from 3.3 kWh to 4.0 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in January

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.


For the purposes of this report, the geographical coordinates of Bylas are 33.134 deg latitude, -110.120 deg longitude, and 2,785 ft elevation.

The topography within 2 miles of Bylas contains significant variations in elevation, with a maximum elevation change of 548 feet and an average elevation above sea level of 2,734 feet. Within 10 miles contains significant variations in elevation (5,666 feet). Within 50 miles also contains extreme variations in elevation (8,930 feet).

The area within 2 miles of Bylas is covered by shrubs (85%) and cropland (11%), within 10 miles by shrubs (93%), and within 50 miles by shrubs (75%) and trees (21%).

Data Sources

This report illustrates the typical weather in Bylas year round, 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Bylas.

For each station, the records are corrected for the elevation difference between that station and Bylas 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 Bylas is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Bylas and a given station.

The stations contributing to this reconstruction are: Safford Municipal Airport (53%, 55 kilometers, southeast); Show Low Municipal Airport (10%, 126 kilometers, north); Allied Airstrip (15%, 129 kilometers, southwest); Phoenix-Mesa Gateway Airport (12%, 145 kilometers, west); and Payson Airport (9%, 168 kilometers, northwest).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.


The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.