Exemplary Weather and Energy (EWE) Index January 2026

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 (%)

10-storey 3-storey Supermarket
Heating Cooling Heating Cooling Heating Cooling
N.A. +37.8% N.A. +39.0% N.A. +22.3%
Solar PV
+4.5%
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The solar PV simulation output was 5.2% 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 21.3%, 47.7% and 10.9%, 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 much higher temperatures and lower humidity in January compared to the long-term average. The GHI was much higher than the long-term average and wind speeds were generally similar.

Weather Index

Temperature (°C)
Mean Min Mean Avg Mean Max
+0.6 +1.6 +3.5
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Relative Humidity (%pt)
Mean Min Mean Avg Mean Max
-1.0 -1.7 +1.3
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Daily Solar Irradiation (GHI %)
Cloudiest Mean Sunniest
+62.9 +7.5 +0.5
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BRISBANE

Energy Index (%)

10-storey 3-storey Supermarket
Heating Cooling Heating Cooling Heating Cooling
N.A. +8.8% N.A. +8.7% N.A. +15.0%
Solar PV
-5.9%
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The solar PV simulation output was 5.9% 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 8.2%, 10.5% and 3.3%, 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.

Brisbane experienced slightly higher temperatures and similar humidity in January compared to the long-term average. The GHI was much lower than the long-term average around midday. Wind speeds were lower than the long-term average for most of the day.

Weather Index

Temperature (°C)
Mean Min Mean Avg Mean Max
+1.1 +0.8 +1.1
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Relative Humidity (%pt)
Mean Min Mean Avg Mean Max
-1.1 -0.5 -1.6
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Daily Solar Irradiation (GHI %)
Cloudiest Mean Sunniest
+11.7 -5.8 -0.4
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CANBERRA

Energy Index (%)

10-storey 3-storey Supermarket
Heating Cooling Heating Cooling Heating Cooling
N.A. +18.2% N.A. +19.0% +21.9% +15.3%
Solar PV
+5.2%
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The solar PV simulation output was 5.2% 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 14.4%, 12.4% and 9.8%, 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.

Canberra experienced lower humidity and higher temperatures in January compared to the long-term average. Both GHI and wind speeds were significantly higher than the long-term average.

Weather Index

Temperature (°C)
Mean Min Mean Avg Mean Max
-0.1 +0.8 +2.3
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Relative Humidity (%pt)
Mean Min Mean Avg Mean Max
-1.2 +0.0 +1.3
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Daily Solar Irradiation (GHI %)
Cloudiest Mean Sunniest
+143.8 +7.1 -0.8
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DARWIN

Energy Index (%)

10-storey 3-storey Supermarket
Heating Cooling Heating Cooling Heating Cooling
N.A. +4.4% N.A. +3.6% N.A. +4.1%
Solar PV
-2.9%
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The solar PV simulation output was 2.9% lower than the long-term average. The cooling peak load was slightly lower than the long-term average for the 3-storey office building and 10-storey office building by 1.6% and 2.1% while 0.9% higher for the supermarket. 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 more humid January with temperatures similar to the long-term average. GHI was lower than the long-term average, while wind speeds were higher than the long-term average for most of the day.

Weather Index

Temperature (°C)
Mean Min Mean Avg Mean Max
-0.1 +0.3 +0.4
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Relative Humidity (%pt)
Mean Min Mean Avg Mean Max
+7.3 +7.1 +5.5
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Daily Solar Irradiation (GHI %)
Cloudiest Mean Sunniest
-35.8 -8.9 +0.2
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HOBART

Energy Index (%)

10-storey 3-storey Supermarket
Heating Cooling Heating Cooling Heating Cooling
N.A. +3.0% N.A. +5.0% -36.7% +1.8%
Solar PV
+7.5%
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The solar PV simulation output was 7.5% higher than the long-term average. The cooling peak load was lower than the long-term average for the 3-storey office, the 10-storey office and the supermarket by 54.9%, 58.3% and 16.1%, 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.

Hobart experienced a more humid and hotter January compared to the long-term average. GHI and wind speeds were similar to the long-term average for most of the day.

Weather Index

Temperature (°C)
Mean Min Mean Avg Mean Max
+1.0 +0.5 -0.1
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Relative Humidity (%pt)
Mean Min Mean Avg Mean Max
+3.3 +1.6 -1.6
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Daily Solar Irradiation (GHI %)
Cloudiest Mean Sunniest
+15.0 -1.5 -4.7
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MELBOURNE

Energy Index (%)

10-storey 3-storey Supermarket
Heating Cooling Heating Cooling Heating Cooling
N.A. +16.1% N.A. +17.5% -19.0% +11.7%
Solar PV
+10.6%
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The solar PV simulation output was 10.6% higher than the long-term average. The cooling peak load was higher than the long-term average for the 3-storey office, the 10-storey office and the supermarket by 25.1%, 24.5% and 17.0%, 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.

Melbourne experienced higher temperatures and humidity in January compared to the long-term average. GHI was significantly higher than the long-term average during the daytime.

Weather Index

Temperature (°C)
Mean Min Mean Avg Mean Max
+0.0 +0.4 +0.9
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Relative Humidity (%pt)
Mean Min Mean Avg Mean Max
+3.0 +3.2 +2.7
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Daily Solar Irradiation (GHI %)
Cloudiest Mean Sunniest
+59.0 +9.9 +2.2
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PERTH

Energy Index (%)

10-storey 3-storey Supermarket
Heating Cooling Heating Cooling Heating Cooling
N.A. +11.4% N.A. +9.9% N.A. +9.7%
Solar PV
+4.1%
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The solar PV simulation output was 4.1% higher than the long-term average. The cooling peak load was higher than the long-term average for the 3-storey office, the 10-storey office and the supermarket by 20.8%, 22.8% and 3.3%, 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 higher temperatures and lower humidity in January compared to the long-term average. Both GHI and wind speeds were higher than the long-term average.

Weather Index

Temperature (°C)
Mean Min Mean Avg Mean Max
+0.3 +1.1 +1.3
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Relative Humidity (%pt)
Mean Min Mean Avg Mean Max
-3.3 -7.1 -8.8
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Daily Solar Irradiation (GHI %)
Cloudiest Mean Sunniest
+71.4 +3.5 -1.1
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SYDNEY

Energy Index (%)

10-storey 3-storey Supermarket
Heating Cooling Heating Cooling Heating Cooling
N.A. +9.0% N.A. +9.9% N.A. +5.3%
Solar PV
-1.5%
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The solar PV simulation output was 1.5% lower than the long-term average. The cooling peak load was higher than the long-term average for the 3-storey office, the 10-storey office and the supermarket by 59.3%, 61.3% and 28.4%, 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.

Sydney experienced slightly higher temperatures and similar humidity in January compared to the long-term average. GHI was lower than the long-term average during the daytime. Wind speeds were lower in the early morning and evening but higher than the long-term average for the rest of the day.

Weather Index

Temperature (°C)
Mean Min Mean Avg Mean Max
-0.1 +0.3 +1.3
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Relative Humidity (%pt)
Mean Min Mean Avg Mean Max
+0.0 +0.6 +1.5
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Daily Solar Irradiation (GHI %)
Cloudiest Mean Sunniest
-49.3 -0.7 +1.0
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