Nomograms for forecasting temperature


Nomograms are empirically-derived diagrams that help us forecast weather elements. The ones presented here are used for forecasting temperatures.

The Barthrum method is a method used to forecast overnight lows. It was originally developed for British climates, but seems to work well on the prairies, especially on the east side of Arctic high pressure systems.
Here are the different nomograms for different expected wind speeds.

The following method was developed at the PASPC-Winnipeg, taking into account the season and the average cloud cover expected for the time period. It helps to forecast highs and lows, and appears applicable to the entire prairies.

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Last update to this page: March 29, 2006