Exemplary Weather and Energy (EWE) Index October 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 10.8% lower than the long-term average. The cooling peak load was lower than the long-term average for the 3-storey office building, 10-storey office building and the supermarket, by 37.5%, 39.3% and 17.9%, 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 higher humidity and similar temperatures in October compared to the long-term average. The GHI was lower than the long-term average before lunch time but similar in the afternoon. The wind was slightly higher than the long-term average in the early morning but lower for most of the daytime.

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 6.4% 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 53.2%, 56.8% and 40.7%, 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.

Brisbane experienced higher humidity and temperatures in October compared to the long-term average. The GHI was slightly lower than the long-term average, but the wind speed was higher for most of the day.

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 3.4% lower than the long-term average. The heating peak load was higher than the long-term average for 3-storey and 10-storey office buildings, by 65.4% and 45%, respectively, and lower for the supermarket, by 7.8%.  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 higher temperatures but lower humidity in October compared to the long-term average. The GHI was similar to the average, but the wind speed was much higher.

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 3.7% 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 3.5%, 3.5% and 2.0%, 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 a slightly warmer and more humid October compared to the long-term average. The GHI was much higher than the average, while wind speed remained similar to the long-term average.

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 1.6% lower 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 62.6%, 56.3% and 54.7%, 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.

Hobart experienced a slightly cooler and drier October compared to the long-term average. The GHI was similar to the long-term average, while wind speed was much higher.

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 12.6% lower 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 50.3%, 54.0% and 12.5%, 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.

Melbourne experienced similar temperatures and slightly higher humidity in October compared to the long-term average. The GHI was lower than average for most of the day.

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 0.9% higher 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 17.5%, 20.2% and 20.3%, 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 slightly warmer temperatures and more humidity in October compared to the long-term average. The GHI was below average in the morning and at lunch time. The wind speed was lower than the long-term average for most of the time.

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 2.7% higher 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 33.5%, 44.1% and 18.6%, 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.

Sydney experienced warmer temperatures and lower humidity in October compared to the long-term average. The GHI was similar to the average for most of the day but slightly higher at around lunchtime. The wind speed was higher than the long-term average in the early morning, then decreased until midday, and then increased again in the afternoon and evening

Weather Index

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WordPress Data Table Plugin
WordPress Data Table Plugin

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