Exemplary Weather and Energy (EWE) Index August 2025

The Exemplary Real Time Year weather files (RTYs), current Reference Meteorological Year files (RMYs) and Ersatz Future Meteorological Years (EFMYs) used for these monthly simulations are available for purchase. This will allow clients to simulate their own designs for energy budgeting and monitoring rather than rely on analogy with the performance of these archetypical buildings and systems. Especially in mild months, small differences in energy consumptions can result in large percentage differences. Solar irradiation data courtesy of Solcast.

Archetypical buildings and systems

10-storey office

3-storey office

Supermarket

5 kW domestic
PV system

Get the Best out of our Interactive Features

This monthly report has been interactive since April 2023.  Once you have scrolled to your city of interest, check out those interactive features and how they work.  Click here to read about the introduction.

  • 1. Choose the energy or peak demand graph to best match your building or system of interest.
  • 2. Choose the weather element graph to best match the sensitivity of your building or system of interest.
  • 3. Mix and match to learn about their relative importance or sensitivity

ADELAIDE

Energy Index (%)

WordPress Data Table Plugin

The solar PV simulation output was 3.4% lower than the long-term average. The heating peak load was lower than the long-term average for the 3-storey office building, 10-storey office building and the supermarket, by 29.2%, 24.0% and 17.7%, respectively. It should be noted that peak load results are highly sensitive to the particular building and HVAC design and settings – it is more appropriate to evaluate those results from a bespoke building model using our RTY data.

Adelaide experienced more humidity during daytime in August with temperature similar to the long-term average. The GHI was slightly lower than the long-term average and the wind speed was higher in the early morning and at night.

Weather Index

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WordPress Data Table Plugin
WordPress Data Table Plugin


BRISBANE

Energy Index (%)

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The solar PV simulation output was 11.5% lower than the long-term average. The cooling peak load was higher than the long-term average for the 3-storey office building, 10-storey office building and supermarket, by 30.4%, 33.8%, and 21.4%, respectively. It should be noted that peak load results are highly sensitive to the particular building and HVAC design and settings – it is more appropriate to evaluate those results from a bespoke building model using our RTY data.

Brisbane experienced more humidity during August than the long-term average. The temperature was higher overnight but close to the long-term average during the daytime. The GHI was lower than the long-term average. The wind speed was lower during the daytime but higher overnight.

Weather Index

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WordPress Data Table Plugin
WordPress Data Table Plugin


CANBERRA

Energy Index (%)

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The solar PV simulation output was 2.3% lower than the long-term average. The heating peak load was higher than the long-term average for the 3-storey office building, 10-storey office building, and supermarket, by 2.1%, 3.9% and 0.1%, respectively. It should be noted that peak load results are highly sensitive to the particular building and HVAC design and settings – it is more appropriate to evaluate those results from a bespoke building model using our RTY data.

Canberra experienced a more humid August with temperature similar to the long-term average. The GHI was similar to the long-term average, while the wind speed was lower than the average.

Weather Index

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WordPress Data Table Plugin
WordPress Data Table Plugin


DARWIN

Energy Index (%)

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The solar PV simulation output was 2.4% lower than the long-term average. The cooling peak load was higher than the long-term average for the 3-storey office building, 10-storey office building, and supermarket, by 7.5%, 8.5%, and 0.8%, respectively. It should be noted that peak load results are highly sensitive to the particular building and HVAC design and settings – it is more appropriate to evaluate those results from a bespoke building model using our RTY data.

Darwin experienced slightly warmer afternoons in August with humidity similar to the long-term average. The GHI was slightly higher than the average but the wind speed was much lower.

Weather Index

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WordPress Data Table Plugin
WordPress Data Table Plugin


HOBART

Energy Index (%)

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The solar PV simulation output was 3.0% higher than the long-term average. The heating peak load was higher than the long-term average for the 3-storey office, the 10-storey office and the supermarket by 5.5%, 4.6% and 1.5%, respectively. It should be noted that peak load results are highly sensitive to the particular building and HVAC design and settings – it is more appropriate to evaluate those results from a bespoke building model using our RTY data.

Hobart experienced slightly warmer afternoons and evenings in August with less humidity during the daytime. The GHI was slightly higher than the long-term average.

Weather Index

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WordPress Data Table Plugin
WordPress Data Table Plugin


MELBOURNE

Energy Index (%)

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The solar PV simulation output was 7.1% higher than the long-term average. The heating peak load was higher than the long-term average for the 3-storey office and 10-storey office, by 20.4% and 22.1%, respectively, while it was 3.3% lower for the supermarket building. It should be noted that peak load results are highly sensitive to the particular building and HVAC design and settings – it is more appropriate to evaluate those results from a bespoke building model using our RTY data.

Melbourne experienced slightly warmer temperatures and more humidity in August compared to the long-term average. The GHI was slightly lower than the average in the morning but slightly higher in the afternoon.

Weather Index

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WordPress Data Table Plugin
WordPress Data Table Plugin


PERTH

Energy Index (%)

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The solar PV simulation output was 5.8% lower than the long-term average. The cooling peak load was higher than the long-term average for the 3-storey office building, 10-storey office building and supermarket, by 28.9%, 43.7%, and 78.6%, respectively. It should be noted that peak load results are highly sensitive to the particular building and HVAC design and settings – it is more appropriate to evaluate those results from a bespoke building model using our RTY data.

Perth experienced warmer temperatures in August. The humidity was lower in the morning but higher for the rest of the day. The GHI was slightly higher than the average. The wind was higher in the morning.

Weather Index

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WordPress Data Table Plugin
WordPress Data Table Plugin


SYDNEY

Energy Index (%)

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The solar PV simulation output was 25.9% lower than the long-term average. The cooling peak load was higher than the long-term average for the 3-storey office building and the supermarket, by 11.6% and 28.6%, respectively, and lower for the 10-storey office building, at 7.2%. It should be noted that peak load results are highly sensitive to the particular building and HVAC design and settings – it is more appropriate to evaluate those results from a bespoke building model using our RTY data.

Sydney experienced much more humidity in August. The temperature was higher than the long-term average in the morning but lower in the afternoon. The GHI was much lower than the average. The wind speed was higher in the morning and in the evening, but lower in the afternoon.

Weather Index

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WordPress Data Table Plugin
WordPress Data Table Plugin

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