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Average Weather in Bacchus Marsh Australia

In Bacchus Marsh, the summers are warm, the winters are cold and windy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 42°F to 79°F and is rarely below 35°F or above 96°F.

Based on the tourism score, the best time of year to visit Bacchus Marsh for warm-weather activities is from early January to early March.

Climate Summary

warmcoolcoldcoolcomfortableJanFebMarAprMayJunJulAugSepOctNovDec72%72%52%52%clearovercastprecipitation: 1.9 inprecipitation: 1.9 in1.0 in1.0 inmuggy: 2%muggy: 2%0%0%drydrytourism score: 6.3tourism score: 6.30.30.3
Click on each chart for more information.

Temperature

The warm season lasts for 3.1 months, from December 12 to March 14, with an average daily high temperature above 74°F. The hottest day of the year is January 24, with an average high of 79°F and low of 58°F.

The cool season lasts for 3.4 months, from May 23 to September 5, with an average daily high temperature below 59°F. The coldest day of the year is July 23, with an average low of 42°F and high of 55°F.

Average High and Low Temperature

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 entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

Average Hourly Temperature in Bacchus MarshJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMvery coldcoldcoolcoolcomfortablecomfortablewarm
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.

Baltar, Portugal (10,984 miles away) and Mar del Plata, Argentina (7,031 miles) are the far-away foreign places with temperatures most similar to Bacchus Marsh (view comparison).

Clouds

In Bacchus Marsh, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year in Bacchus Marsh begins around December 11 and lasts for 4.2 months, ending around April 18. On February 8, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 72% of the time, and overcast or mostly cloudy 28% of the time.

The cloudier part of the year begins around April 18 and lasts for 7.8 months, ending around December 11. On June 6, the cloudiest day of the year, the sky is overcast or mostly cloudy 48% of the time, and clear, mostly clear, or partly cloudy 52% of the time.

Cloud Cover Categories

Cloud Cover Categories in Bacchus MarshclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Feb 872%Feb 872%Jun 652%Jun 652%Dec 1162%Dec 1162%Apr 1862%Apr 1862%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.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Bacchus Marsh varies throughout the year.

The wetter season lasts 6.9 months, from May 1 to November 27, with a greater than 21% chance of a given day being a wet day. The chance of a wet day peaks at 31% on August 22.

The drier season lasts 5.2 months, from November 27 to May 1. The smallest chance of a wet day is 11% on February 27.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 31% on August 22.

Daily Chance of Precipitation

Daily Chance of Precipitation in Bacchus MarshwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Aug 2231%Aug 2231%Feb 2711%Feb 2711%Jan 115%Jan 115%May 121%May 121%rain
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 months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Bacchus Marsh experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Bacchus Marsh. The most rain falls during the 31 days centered around October 23, with an average total accumulation of 1.9 inches.

The least rain falls around March 5, with an average total accumulation of 1.0 inches.

Average Monthly Rainfall

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.

Sun

The length of the day in Bacchus Marsh varies significantly over the course of the year. In 2019, the shortest day is June 22, with 9 hours, 33 minutes of daylight; the longest day is December 22, with 14 hours, 47 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in Bacchus MarshJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minSep 2312 hr, 8 minSep 2314 hr, 47 minDec 2214 hr, 47 minDec 2212 hr, 10 minMar 2112 hr, 10 minMar 219 hr, 33 minJun 229 hr, 33 minJun 22daydaynight
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 is at 5:52 AM on October 5, and the latest sunrise is 1 hour, 47 minutes later at 7:39 AM on April 6. The earliest sunset is at 5:09 PM on June 14, and the latest sunset is 3 hours, 38 minutes later at 8:47 PM on January 5.

Daylight saving time (DST) is observed in Bacchus Marsh during 2019, starting in the spring on October 6 and ending in the fall on April 7.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in Bacchus MarshJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMOct 55:52 AMOct 55:52 AM8:47 PMJan 58:47 PMJan 5Jun 145:09 PMJun 145:09 PM7:39 AMApr 67:39 AMApr 6DSTApr 7DSTApr 7Oct 6DSTOct 6DSTdaynightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2019. 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 transitions to and from daylight saving time are indicated by the 'DST' labels.

Humidity

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 perceived humidity level in Bacchus Marsh, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 1% of 1% throughout.

Humidity Comfort Levels

Humidity Comfort Levels in Bacchus MarshJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jul 200%Jul 200%Jan 242%Jan 242%drydryhumidhumid
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.

Wind

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 Bacchus Marsh experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 4.6 months, from June 17 to November 4, with average wind speeds of more than 10.4 miles per hour. The windiest day of the year is August 9, with an average hourly wind speed of 11.5 miles per hour.

The calmer time of year lasts for 7.4 months, from November 4 to June 17. The calmest day of the year is April 23, with an average hourly wind speed of 9.4 miles per hour.

Average Wind Speed

Average Wind Speed in Bacchus MarshwindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mph18 mphAug 911.5 mphAug 911.5 mphApr 239.4 mphApr 239.4 mphJun 1710.4 mphJun 1710.4 mphNov 410.4 mphNov 410.4 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Bacchus Marsh varies throughout the year.

The wind is most often from the north for 4.2 months, from April 25 to August 30, with a peak percentage of 44% on July 13. The wind is most often from the west for 1.7 months, from August 30 to October 22, with a peak percentage of 40% on September 24. The wind is most often from the south for 6.1 months, from October 22 to April 25, with a peak percentage of 53% on January 1.

Wind Direction

Wind Direction in Bacchus MarshSNWSJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsouthnortheast
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).

Water Temperature

Bacchus Marsh is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.4 months, from December 25 to April 6, with an average temperature above 65°F. The day of the year with the warmest water is February 16, with an average temperature of 68°F.

The time of year with cooler water lasts for 3.5 months, from June 19 to October 2, with an average temperature below 56°F. The day of the year with the coolest water is August 11, with an average temperature of 53°F.

Average Water Temperature

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is in Bacchus Marsh throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Bacchus Marsh for general outdoor tourist activities is from early January to early March, with a peak score in the second week of February.

Tourism Score

Tourism Score in Bacchus Marshbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.36.30.30.3precipitationprecipitationcloudscloudstourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Bacchus Marsh for hot-weather activities is from mid January to late February, with a peak score in the first week of February.

Beach/Pool Score

Beach/Pool Score in Bacchus MarshJanFebMarAprMayJunJulAugSepOctNovDec02468101.81.80.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

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 Bacchus Marsh typically lasts for 11 months (346 days), from around July 23 to around July 3, rarely starting after September 22, or ending before June 2.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Bacchus Marshgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Jul 2350%Jul 2350%Jul 350%Jul 390%Sep 2290%Sep 2290%Jun 290%Jun 2Jan 30100%Jan 30100%very coldcoldcoolcomfortablewarmhot
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.

Based on growing degree days alone, the first spring blooms in Bacchus Marsh should appear around August 27, only rarely appearing before August 15 or after September 11.

Growing Degree Days

Growing Degree Days in Bacchus MarshJanFebMarAprMayJunJulAugSepOctNovDec0°F500°F1,000°F1,500°F2,000°F2,500°F3,000°FAug 2790°FAug 2790°FDec 10900°FDec 10900°FJun 303,022°FJun 303,022°F
The average growing degree days accumulated over the course of the year, 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 experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.4 months, from November 6 to February 18, with an average daily incident shortwave energy per square meter above 6.9 kWh. The brightest day of the year is January 4, with an average of 8.1 kWh.

The darker period of the year lasts for 3.6 months, from April 30 to August 18, with an average daily incident shortwave energy per square meter below 3.2 kWh. The darkest day of the year is June 25, with an average of 2.0 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in Bacchus MarshbrightbrightdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWh10 kWhJan 48.1 kWhJan 48.1 kWhJun 252.0 kWhJun 252.0 kWhNov 66.9 kWhNov 66.9 kWhApr 303.2 kWhApr 303.2 kWhAug 183.2 kWhAug 183.2 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.

Topography

For the purposes of this report, the geographical coordinates of Bacchus Marsh are -37.673 deg latitude, 144.438 deg longitude, and 472 ft elevation.

The topography within 2 miles of Bacchus Marsh contains significant variations in elevation, with a maximum elevation change of 515 feet and an average elevation above sea level of 420 feet. Within 10 miles contains significant variations in elevation (2,215 feet). Within 50 miles contains large variations in elevation (3,415 feet).

The area within 2 miles of Bacchus Marsh is covered by sparse vegetation (34%), trees (32%), artificial surfaces (22%), and cropland (11%), within 10 miles by sparse vegetation (34%) and cropland (33%), and within 50 miles by cropland (40%) and trees (21%).

Data Sources

This report illustrates the typical weather in Bacchus Marsh, 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 Bacchus Marsh.

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

The stations contributing to this reconstruction are: Laverton Aerodrome (34%, 35 kilometers, southeast); Melbourne Airport (36%, 36 kilometers, east); Avalon, Avalon Airport (27%, 41 kilometers, south); and Stawell Airport (3.6%, 165 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.

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.