Climate and Average Weather Year Round in Streaky Bay South Australia, Australia

In Streaky Bay, the summers are warm and dry, the winters are cold, and it is windy and mostly clear year round. Over the course of the year, the temperature typically varies from 46°F to 78°F and is rarely below 38°F or above 95°F.

Based on the tourism score, the best time of year to visit Streaky Bay for warm-weather activities is from mid December to mid March.

The warm season lasts for 3.8 months, from November 27 to March 20, with an average daily high temperature above 75°F. The hottest month of the year in Streaky Bay is January, with an average high of 78°F and low of 62°F.

The cool season lasts for 3.0 months, from May 29 to August 29, with an average daily high temperature below 64°F. The coldest month of the year in Streaky Bay is July, with an average low of 46°F and high of 61°F.

In Streaky Bay, 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 Streaky Bay begins around June 30 and lasts for 3.7 months, ending around October 20.

The clearest month of the year in Streaky Bay is September, during which on average the sky is clear, mostly clear, or partly cloudy 79% of the time.

The cloudier part of the year begins around October 20 and lasts for 8.3 months, ending around June 30.

The cloudiest month of the year in Streaky Bay is May, during which on average the sky is overcast or mostly cloudy 36% of the time.

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

The wetter season lasts 3.8 months, from May 15 to September 9, with a greater than 13% chance of a given day being a wet day. The month with the most wet days in Streaky Bay is July, with an average of 6.6 days with at least 0.04 inches of precipitation.

The drier season lasts 8.2 months, from September 9 to May 15. The month with the fewest wet days in Streaky Bay is January, with an average of 1.3 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Streaky Bay is July, with an average of 6.6 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 23% on July 1.

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. Streaky Bay experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 10 months, from February 16 to December 17, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Streaky Bay is July, with an average rainfall of 1.3 inches.

The rainless period of the year lasts for 2.0 months, from December 17 to February 16. The month with the least rain in Streaky Bay is January, with an average rainfall of 0.3 inches.

The length of the day in Streaky Bay varies significantly over the course of the year. In 2024, the shortest day is June 21, with 9 hours, 59 minutes of daylight; the longest day is December 21, with 14 hours, 19 minutes of daylight.

The earliest sunrise is at 6:05 AM on October 5, and the latest sunrise is 1 hour, 43 minutes later at 7:48 AM on April 6. The earliest sunset is at 5:33 PM on June 11, and the latest sunset is 3 hours, 12 minutes later at 8:45 PM on January 9.

Daylight saving time (DST) is observed in Streaky Bay during 2024, starting in the spring on October 6 and ending in the fall on April 7.

The figure below presents a compact representation of key lunar data for 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.

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 Streaky Bay, 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 2% of 2% throughout.

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 Streaky Bay experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 8.9 months, from June 16 to March 13, with average wind speeds of more than 12.2 miles per hour. The windiest month of the year in Streaky Bay is January, with an average hourly wind speed of 13.6 miles per hour.

The calmer time of year lasts for 3.1 months, from March 13 to June 16. The calmest month of the year in Streaky Bay is April, with an average hourly wind speed of 11.0 miles per hour.

The predominant average hourly wind direction in Streaky Bay varies throughout the year.

The wind is most often from the north for 1.2 months, from May 11 to June 18 and for 1.4 weeks, from July 5 to July 15, with a peak percentage of 35% on July 10. The wind is most often from the west for 2.4 weeks, from June 18 to July 5 and for 2.2 months, from July 15 to September 20, with a peak percentage of 38% on August 9. The wind is most often from the south for 7.7 months, from September 20 to May 11, with a peak percentage of 60% on January 1.

Streaky Bay 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 3.7 months, from December 11 to April 1, with an average temperature above 65°F. The month of the year in Streaky Bay with the warmest water is February, with an average temperature of 66°F.

The time of year with cooler water lasts for 2.8 months, from July 1 to September 25, with an average temperature below 60°F. The month of the year in Streaky Bay with the coolest water is August, with an average temperature of 58°F.

To characterize how pleasant the weather is in Streaky Bay 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 Streaky Bay for general outdoor tourist activities is from mid December to mid March, with a peak score in the last week of January.

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 Streaky Bay for hot-weather activities is from early January to mid February, with a peak score in the last week of January.

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.

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 Streaky Bay 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.

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.

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 3.6 months, from November 2 to February 19, with an average daily incident shortwave energy per square meter above 7.2 kWh. The brightest month of the year in Streaky Bay is January, with an average of 8.2 kWh.

The darker period of the year lasts for 3.5 months, from April 29 to August 13, with an average daily incident shortwave energy per square meter below 3.7 kWh. The darkest month of the year in Streaky Bay is June, with an average of 2.6 kWh.

For the purposes of this report, the geographical coordinates of Streaky Bay are -32.796 deg latitude, 134.209 deg longitude, and 39 ft elevation.

The topography within 2 miles of Streaky Bay contains only modest variations in elevation, with a maximum elevation change of 217 feet and an average elevation above sea level of 55 feet. Within 10 miles also contains only modest variations in elevation (341 feet). Within 50 miles contains only modest variations in elevation (705 feet).

The area within 2 miles of Streaky Bay is covered by cropland (42%) and water (37%), within 10 miles by cropland (35%) and water (35%), and within 50 miles by water (51%) and cropland (23%).