How accurate are BOM weather forecasts compared to local weather models?

In June 2024 testing for Dayboro, Queensland, the Bureau of Meteorology (BOM) achieved a 90% accuracy rate for high temperatures , compared to 20% for a locally tuned prediction model. For low temperatures, BOM scored 73.33% versus 53.33% locally. Precipitation was the closest category, with BOM at 93.33% and the local model at 90%. These results show BOM maintains strong overall accuracy, though local models can compete well on rainfall predictions.

What is the Inigo Jones weather prediction method?

The Inigo Jones method is a long-range weather forecasting approach used in Australia that correlates planetary positions and solar activity with weather patterns. Predictions are typically generated a month and a year in advance, making it fundamentally different from short-range numerical weather models used by the BOM. The method has a following among Australian farmers and rural communities, particularly in Queensland, who use it for seasonal planning alongside official forecasts.

How accurate are rainfall predictions in Dayboro Queensland?

Rainfall predictions for Dayboro, Queensland tend to be the most reliable category across forecasting methods. In June 2024 analysis, local model rainfall predictions achieved a 90% accuracy rate , while the BOM scored 93.33% , a difference of just one correct prediction out of 30 days. This close alignment suggests that winter rainfall patterns in the Dayboro region of the D'Aguilar Range are relatively predictable compared to temperature forecasts.

Why are temperature forecasts less accurate than rainfall forecasts?

Temperature forecasts, particularly high temperatures, are often less accurate because they are sensitive to local microclimates, cloud cover timing, and wind direction changes that are difficult to model precisely. In Dayboro's case, its location in the D'Aguilar Range hinterland creates localised temperature variations that broad-scale models may miss. Data quality also matters , errors in the prediction script or summarising the wrong dataset can significantly skew results, as was identified in the June 2024 analysis.

Can local weather stations outperform BOM forecasts?

Local weather stations paired with tuned prediction models can match or outperform BOM in specific categories , particularly precipitation. In Dayboro's June 2024 results, the local model scored 90% on rainfall versus BOM's 93.33%. However, BOM's advantage in temperature forecasting (90% vs 20% for highs) reflects the strength of their national numerical weather prediction infrastructure. Local models work best when properly calibrated and combined with methods like Inigo Jones for longer-range outlooks.

June 2024 Weather Prediction Analysis

Analysis of June 2024 weather prediction accuracy for Dayboro, comparing high temperature, low temperature, and precipitation forecasts from the Dayboro Model, Bureau of Meteorology, and Inigo Jones method.

Analysis of Predictions and Actual Recordings

High Temperature Predictions:

My Predictions: A total of 6 out of 30 high-temperature predictions were accurate, resulting in a 20% pass rate.
BOM Predictions: The BOM achieved a 90% pass rate with 27 out of 30 high-temperature predictions being accurate.

Clearly, there’s a significant performance gap, indicating that my high-temperature prediction script requires fine-tuning. I think I might have summarised the wrong data set; I will have to look at the scripts.

Low Temperature Predictions:

My Predictions: 16 out of 30 predictions were accurate, equating to a 53.33% pass rate.
BOM Predictions: The BOM scored a 73.33% pass rate with 22 accurate predictions.

Although my low-temperature predictions were relatively better, still not what I expected, it usually is well above the 70% score. There’s room for improvement to match BOM’s precision.

Precipitation Predictions:

My Predictions: With 27 out of 30 predictions correct, I achieved a 90% pass rate.
BOM Predictions: BOM slightly outperformed with a 93.33% pass rate, securing 28 accurate predictions.

Precipitation predictions remain my strong suit, closely aligning with BOM’s results.

In conclusion, while my precipitation predictions are not too dire, the discrepancies in high-temperature predictions highlight that something has gone wrong. I usually have a better score than this.

Dayboro.AU

BOM

Inigo Jones

I recently started playing with the Inigo Jones method, so it is only fair to add those results as well. Generally, I create an Inigo Jones method prediction a month and a year in advance.

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