Climate and Average Weather Year Round in Happy Valley Australia

In Happy Valley, 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 80°F and is rarely below 39°F or above 93°F.

Based on the tourism score, the best time of year to visit Happy Valley for warm-weather activities is from late December to early March.

The warm season lasts for 3.2 months, from December 7 to March 15, with an average daily high temperature above 75°F. The hottest month of the year in Happy Valley is January, with an average high of 79°F and low of 63°F.

The cool season lasts for 3.5 months, from May 23 to September 9, with an average daily high temperature below 62°F. The coldest month of the year in Happy Valley is July, with an average low of 46°F and high of 58°F.

In Happy Valley, 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 Happy Valley begins around December 11 and lasts for 3.8 months, ending around April 6.

The clearest month of the year in Happy Valley is February, during which on average the sky is clear, mostly clear, or partly cloudy 75% of the time.

The cloudier part of the year begins around April 6 and lasts for 8.2 months, ending around December 11.

The cloudiest month of the year in Happy Valley is May, during which on average the sky is overcast or mostly cloudy 41% 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 Happy Valley varies throughout the year.

The wetter season lasts 4.8 months, from May 3 to September 27, with a greater than 19% chance of a given day being a wet day. The month with the most wet days in Happy Valley is July, with an average of 9.5 days with at least 0.04 inches of precipitation.

The drier season lasts 7.2 months, from September 27 to May 3. The month with the fewest wet days in Happy Valley is February, with an average of 1.8 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 Happy Valley is July, with an average of 9.5 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 32% 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. Happy Valley experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Happy Valley. The month with the most rain in Happy Valley is June, with an average rainfall of 2.1 inches.

The month with the least rain in Happy Valley is January, with an average rainfall of 0.5 inches.

The length of the day in Happy Valley varies significantly over the course of the year. In 2024, the shortest day is June 21, with 9 hours, 48 minutes of daylight; the longest day is December 21, with 14 hours, 31 minutes of daylight.

The earliest sunrise is at 5:46 AM on October 5, and the latest sunrise is 1 hour, 46 minutes later at 7:32 AM on April 6. The earliest sunset is at 5:10 PM on June 11, and the latest sunset is 3 hours, 23 minutes later at 8:33 PM on January 7.

Daylight saving time (DST) is observed in Happy Valley 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 Happy Valley, 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.

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 Happy Valley experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 4.3 months, from November 5 to March 14, with average wind speeds of more than 11.6 miles per hour. The windiest month of the year in Happy Valley is January, with an average hourly wind speed of 12.6 miles per hour.

The calmer time of year lasts for 7.7 months, from March 14 to November 5. The calmest month of the year in Happy Valley is May, with an average hourly wind speed of 10.5 miles per hour.

The predominant average hourly wind direction in Happy Valley varies throughout the year.

The wind is most often from the north for 2.5 months, from May 7 to July 21, with a peak percentage of 38% on July 11. The wind is most often from the west for 2.7 months, from July 21 to October 11, with a peak percentage of 41% on August 9. The wind is most often from the south for 6.9 months, from October 11 to May 7, with a peak percentage of 54% on January 1.

Happy Valley 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 24 to April 6, with an average temperature above 67°F. The month of the year in Happy Valley with the warmest water is February, with an average temperature of 70°F.

The time of year with cooler water lasts for 3.5 months, from June 20 to October 3, with an average temperature below 58°F. The month of the year in Happy Valley with the coolest water is August, with an average temperature of 56°F.

To characterize how pleasant the weather is in Happy Valley 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 Happy Valley for general outdoor tourist activities is from late December to early March, with a peak score in the third 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 Happy Valley 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 Happy Valley 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 3.5 months, from November 4 to February 19, with an average daily incident shortwave energy per square meter above 7.1 kWh. The brightest month of the year in Happy Valley is January, with an average of 8.1 kWh.

The darker period of the year lasts for 3.6 months, from April 29 to August 17, with an average daily incident shortwave energy per square meter below 3.5 kWh. The darkest month of the year in Happy Valley is June, with an average of 2.3 kWh.

For the purposes of this report, the geographical coordinates of Happy Valley are -35.083 deg latitude, 138.533 deg longitude, and 394 ft elevation.

The topography within 2 miles of Happy Valley contains significant variations in elevation, with a maximum elevation change of 581 feet and an average elevation above sea level of 405 feet. Within 10 miles contains significant variations in elevation (1,614 feet). Within 50 miles contains very significant variations in elevation (2,444 feet).

The area within 2 miles of Happy Valley is covered by artificial surfaces (59%), sparse vegetation (21%), and cropland (10%), within 10 miles by water (34%) and trees (24%), and within 50 miles by water (47%) and cropland (32%).