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January Weather in Roxby Downs South Australia, Australia

Daily high temperatures are around 94°F, rarely falling below 82°F or exceeding 106°F. The highest daily average high temperature is 95°F on January 24.

Daily low temperatures are around 71°F, rarely falling below 61°F or exceeding 82°F. The highest daily average low temperature is 71°F on January 24.

For reference, on January 12, the hottest day of the year, temperatures in Roxby Downs typically range from 71°F to 95°F, while on July 7, the coldest day of the year, they range from 44°F to 63°F.

Average High and Low Temperature in January in Roxby Downs

Average High and Low Temperature in January in Roxby DownsJan112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313155°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°F90°F90°F95°F95°F100°F100°F105°F105°F110°F110°FDecFebJan 1295°FJan 1295°F71°F71°FJan 194°FJan 194°F70°F70°FJan 3194°FJan 3194°F71°F71°FJan 2195°FJan 2195°F71°F71°F
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 in Roxby Downs

Average Hourly Temperature in January in Roxby DownsJan112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMDecFebcomfortablewarmwarmwarmhot
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.

Wildwood, Texas, United States (9,420 miles away) and Thomasville, Georgia, United States (10,033 miles) are the far-away foreign places with temperatures most similar to Roxby Downs (view comparison).

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The month of January in Roxby Downs experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 24% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 22% on January 14.

The clearest day of the month is January 14, with clear, mostly clear, or partly cloudy conditions 78% of the time.

For reference, on November 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 30%, while on August 9, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 88%.

Cloud Cover Categories in January in Roxby Downs

Cloud Cover Categories in January in Roxby DownsJan11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%DecFebNov 2170%Nov 2170%Jan 177%Jan 177%Jan 3176%Jan 3176%Jan 1177%Jan 1177%Jan 2176%Jan 2176%clearmostly clearovercastpartly cloudymostly cloudy
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 Roxby Downs, the chance of a wet day over the course of January is essentially constant, remaining around 6% throughout.

For reference, the year's highest daily chance of a wet day is 9% on June 1, and its lowest chance is 4% on April 9.

Probability of Precipitation in January in Roxby Downs

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).

Rainfall

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 Roxby Downs is essentially constant, remaining about 0.6 inches throughout, and rarely exceeding 2.2 inches or falling below -0.0 inches.

The lowest average 31-day accumulation is 0.5 inches on January 2.

Average Monthly Rainfall in January in Roxby Downs

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 snowfall.

Over the course of January in Roxby Downs, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 31 minutes, implying an average daily decrease of 1 minute, 2 seconds, and weekly decrease of 7 minutes, 13 seconds.

The shortest day of the month is January 31, with 13 hours, 34 minutes of daylight and the longest day is January 1, with 14 hours, 5 minutes of daylight.

Hours of Daylight and Twilight in January in Roxby Downs

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 earliest sunrise of the month in Roxby Downs is 6:22 AM on January 1 and the latest sunrise is 25 minutes later at 6:48 AM on January 31.

The latest sunset is 8:29 PM on January 10 and the earliest sunset is 6 minutes earlier at 8:22 PM on January 31.

Daylight saving time is observed in Roxby Downs during 2024, but it neither starts nor ends during January, so the entire month is in standard time.

For reference, on December 21, the longest day of the year, the Sun rises at 6:16 AM and sets 14 hours, 8 minutes later, at 8:24 PM, while on June 20, the shortest day of the year, it rises at 7:18 AM and sets 10 hours, 10 minutes later, at 5:29 PM.

Sunrise & Sunset with Twilight in January in Roxby Downs

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.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in January in Roxby Downs

Solar Elevation and Azimuth in January in Roxby DownsJan112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMDecFeb001010202020303040405050506060707080800001010202030303040405050606060707080
northeastsouthwest
Solar elevation and azimuth over the course of January 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for January 2024. 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 in Roxby Downs

Moon Rise, Set & Phases in January in Roxby DownsJan112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMDecFebDec 1310:03 AMDec 1310:03 AMDec 2711:04 AMDec 2711:04 AMJan 1110:28 PMJan 1110:28 PMJan 264:25 AMJan 264:25 AMFeb 109:30 AMFeb 109:30 AMFeb 2411:01 PMFeb 2411:01 PM5:54 AM5:54 AM8:54 PM8:54 PM8:03 PM8:03 PM5:58 AM5:58 AM5:37 AM5:37 AM8:38 PM8:38 PM8:26 PM8:26 PM6:45 AM6:45 AM6:48 AM6:48 AM8:46 PM8:46 PM8:07 PM8:07 PM7:28 AM7:28 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
Jan 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
80%-10:48 AMWNW-5:12 AMN251,332 mi
2
72%12:03 AMENE11:42 AMW-5:52 AMN251,591 mi
3
62%12:29 AME12:35 PMW-6:31 AMN251,061 mi
4
50%12:54 AME1:28 PMW-7:10 AMN249,702 mi
5
43%1:20 AME2:23 PMWSW-7:49 AMN247,537 mi
6
33%1:48 AMESE3:21 PMWSW-8:32 AMN244,662 mi
7
24%2:19 AMESE4:22 PMWSW-9:17 AMN241,246 mi
8
15%2:56 AMESE5:27 PMWSW-10:08 AMN237,530 mi
9
8%3:40 AMESE6:33 PMWSW-11:05 AMN233,816 mi
10
3%4:34 AMESE7:38 PMWSW-12:06 PMN230,437 mi
11
0%5:37 AMESE8:38 PMWSW-1:09 PMN227,717 mi
12
1%6:47 AMESE9:30 PMWSW-2:12 PMN225,904 mi
13
4%8:01 AMESE10:15 PMWSW-3:12 PMN225,131 mi
14
10%9:13 AMESE10:53 PMWSW-4:07 PMN225,389 mi
15
19%10:23 AME11:27 PMW-4:58 PMN226,553 mi
16
29%11:30 AME11:59 PMW-5:46 PMN228,418 mi
17
41%12:36 PME--6:34 PMN230,752 mi
18
50%-12:30 AMW1:40 PMENE7:21 PMN233,333 mi
19
64%-1:02 AMWNW2:44 PMENE8:11 PMN235,983 mi
20
74%-1:37 AMWNW3:49 PMENE9:03 PMN238,574 mi
21
83%-2:16 AMWNW4:53 PMENE9:57 PMN241,033 mi
22
90%-3:01 AMWNW5:55 PMENE10:53 PMN243,321 mi
23
95%-3:51 AMWNW6:52 PMENE11:50 PMN245,422 mi
24
97%-4:47 AMWNW7:43 PMENE--
25
99%-5:46 AMWNW8:26 PMENE12:44 AMN247,322 mi
26
100%-6:45 AMWNW9:04 PMENE1:36 AMN248,993 mi
27
99%-7:43 AMWNW9:36 PMENE2:24 AMN250,386 mi
28
97%-8:40 AMWNW10:05 PMENE3:08 AMN251,430 mi
29
92%-9:34 AMW10:31 PME3:49 AMN252,032 mi
30
86%-10:28 AMW10:56 PME4:28 AMN252,091 mi
31
79%-11:20 AMW11:21 PME5:07 AMN251,513 mi

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 Roxby Downs is essentially constant during January, remaining within 1% of 3% throughout.

The highest chance of a muggy day during January is 4% on January 24.

For reference, on January 24, the muggiest day of the year, there are muggy conditions 4% of the time, while on May 12, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in January in Roxby Downs

Humidity Comfort Levels in January in Roxby DownsJan11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%DecFebJan 244%Jan 244%Jan 13%Jan 13%Jan 113%Jan 113%comfortablecomfortabledrydryhumidhumidmuggymuggy
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 Roxby Downs is essentially constant during January, remaining within 0.2 miles per hour of 11.6 miles per hour throughout.

For reference, on November 26, the windiest day of the year, the daily average wind speed is 11.8 miles per hour, while on May 18, the calmest day of the year, the daily average wind speed is 8.6 miles per hour.

Average Wind Speed in January in Roxby Downs

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 Roxby Downs throughout January is predominantly from the south, with a peak proportion of 53% on January 28.

Wind Direction in January in Roxby Downs

Wind Direction in January in Roxby DownsJan11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%DecFebsoutheastnorthwest
northeastsouthwest
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).

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).

Temperatures in Roxby Downs are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

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

Time Spent in Various Temperature Bands and the Growing Season in January in Roxby DownsJan11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%DecFeb100%Jan 16100%Jan 16coolcomfortablewarmhotsweltering
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 Roxby Downs are rapidly increasing during January, increasing by 891°F, from 3,019°F to 3,910°F, over the course of the month.

Growing Degree Days in January in Roxby Downs

Growing Degree Days in January in Roxby DownsJan11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031312,800°F2,800°F3,000°F3,000°F3,200°F3,200°F3,400°F3,400°F3,600°F3,600°F3,800°F3,800°F4,000°F4,000°F4,200°F4,200°FDecFebJan 13,019°FJan 13,019°FJan 313,910°FJan 313,910°FJan 113,316°FJan 113,316°FJan 213,613°FJan 213,613°F
The average growing degree days accumulated over the course of January, with 25th to 75th and 10th to 90th percentile bands.

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 Roxby Downs is gradually decreasing during January, falling by 0.5 kWh, from 8.5 kWh to 8.0 kWh, over the course of the month.

The highest average daily incident shortwave solar energy during January is 8.5 kWh on January 5.

Average Daily Incident Shortwave Solar Energy in January in Roxby Downs

Average Daily Incident Shortwave Solar Energy in January in Roxby DownsJan11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWh10 kWh10 kWhDecFebJan 58.5 kWhJan 58.5 kWhJan 318.0 kWhJan 318.0 kWhJan 218.2 kWhJan 218.2 kWh
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 Roxby Downs are -30.563 deg latitude, 136.895 deg longitude, and 351 ft elevation.

The topography within 2 miles of Roxby Downs contains only modest variations in elevation, with a maximum elevation change of 108 feet and an average elevation above sea level of 359 feet. Within 10 miles also contains only modest variations in elevation (315 feet). Within 50 miles contains only modest variations in elevation (741 feet).

The area within 2 miles of Roxby Downs is covered by sparse vegetation (80%) and artificial surfaces (19%), within 10 miles by sparse vegetation (83%) and grassland (12%), and within 50 miles by sparse vegetation (77%) and grassland (13%).

This report illustrates the typical weather in Roxby Downs, 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 is only a single weather station, RAAF Woomera Airfield, in our network suitable to be used as a proxy for the historical temperature and dew point records of Roxby Downs.

At a distance of 65 kilometers from Roxby Downs, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.

The station records are corrected for the elevation difference between the station and Roxby Downs according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

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.

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