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Recalibrated Data


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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.

 

Click here to see information about our Recalibrated products.


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Los Angeles-Downtown USC Campus20/Nov/201220/Nov/2012You are not subscribed to this site   
Des Moines International Airport26/Apr/201220/Nov/2012You are not subscribed to this site   
Atlanta-Hartsfield International Airport18/Oct/201220/Nov/2012You are not subscribed to this site   
Dallas-Fort Worth International Airport20/Nov/201220/Nov/2012You are not subscribed to this site   
New York LaGuardia Airport23/Jan/201220/Nov/2012You are not subscribed to this site   
Archerfield Airport05/Nov/201205/Nov/2012You are not subscribed to this site   
Bankstown Airport AWS05/Nov/201205/Nov/2012You are not subscribed to this site   
Portland International Airport23/Jan/201218/Oct/2012You are not subscribed to this site   
Chicago O'Hare International Airport26/Apr/201218/Oct/2012You are not subscribed to this site   
Washington-Reagan National Airport26/Apr/201226/Apr/2012You are not subscribed to this site   
Kansas City International Airport25/Jan/201226/Apr/2012You are not subscribed to this site   
Minneapolis-Saint Paul International Airport23/Jan/201223/Jan/2012You are not subscribed to this site   

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

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.

Download the full document