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Recalibrated Data
Speedwell Recalibrated Data Sets re-base historical temperature data for important reference sites by adjusting for known or
observed discontinuities that have accumulated over the life time of the observations. The adjustment for such discontinuities
arising from
instrumentation changes or changes to the location of the measuring instruments is critical to a complete understanding of a weather reference site
and in particular to pricing weather hedges.
Available Packs
- Pack of 24 USA CME Sites
- Pack of 5 Australian Sites
- Pack of 5 European Sites
Click here to see our Recalibrated Data real-time site-monitoring tools.
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“Recalibrated data is the best possible baseline for risk analysis”
Why Recalibrated data is crucial:
- Houston (KIAH): discontinuity in previous decade equivalent to > 200 HDD on a seasonal basis
- Kansas (KMCI): repeated discontinuities in current decade equivalent to circa 100 HDD on a seasonal basis
- Philadelphia (KPHL): discontinuity corresponding to > 200 HDD on a seasonal basis in previous decade
- Dallas (KDFW): large warming and cooling discontinuities due to recent station changes
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Impact of station moves on the KIAH historical record (minimum temperature) |
What is a Discontinuity?A discontinuity is a sudden, distinct, and continuous change in the long term observations for a site. A discontinuity represents an end of one continuous regime and the beginning of another. A discontinuity is not a trend. Temperature discontinuities can take the form of warmer or cooler temperatures and / or changes in the variance of the observations. Corrections for all aspects of the discontinuity are important | 
Discontinuity: a sudden, distinct, and lasting change |
Recalibrated Datasets Pack
Delivered on initial subscription and then updated on a six-month cycle the pack comprises:
- Raw meteorological observation dataset as provided by the relevant National Met Service.
- Cleaned dataset [erroneous observations replaced and missing values filled]
- Speedwell Recalibrated Dataset [cleaned data that has been adjusted to remove discontinuities]
- Recalibrated data supporting documentation:
- Station overview with commentary.
- Information regarding the proxy stations used and the creation of the synthetic time series.
- Graphical representation of the statistical analysis.
- Station metadata - the most comprehensive archive available (includes an airport change analysis diagram).
- Discontinuity table with comments.
- Valuation impact on monthly HDD and CDD values of the Speedwell Recalibrated Dataset compared with the cleaned dataset.
Monthly Report
Monthly report detailing changes in recent station behaviour with meteorological commentary, metadata updates, and the notification of future station changes.
Airport Maps
For US CME sites, the Speedwell Recalibrated Datasets subscription provides access to an on-line archive of annotated airport maps in one-year time steps. This helps the user to understand how recent site developments may impact on behaviour.
Real-Time Web Monitor
Subscribers to the Speedwell Recalibrated Dataset are provided with access to web-delivered software that allows the user to see the latest performance of the primary site against a synthetic basket of near-by sites. The user is able to plot moving averages and difference series for different periods to view recent trends. Key statistics are summarised in an easy-to-read sortable table for all subscribed sites. This is updated daily showing any significant recent moves.
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