Petites Dalles Seasonal Surf Averages

Based on the last ten years data for this location this page gives seasonal trends and an idea of what kind of conditions you can expect and when. Of course these are just averages - it's worth reading carefully to understand exactly what they mean and to recognise the kind of variation you could expect on a trip because an average can never tell the whole story. Click on a month below to see more detail. If you want a past forecast for a specific date range then click here.

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Swell Consistency and Wind Overview

Monthly Overview

Jan Swell Consistency 0% Average Swell Height 0ft Average Swell Period 0s Dominant Wind Dominant Swell	Feb Swell Consistency 0% Average Swell Height 0ft Average Swell Period 0s Dominant Wind Dominant Swell	Mar Swell Consistency 0% Average Swell Height 0ft Average Swell Period 0s Dominant Wind Dominant Swell	Apr Swell Consistency 0% Average Swell Height 0ft Average Swell Period 0s Dominant Wind Dominant Swell
May Swell Consistency 0% Average Swell Height 0ft Average Swell Period 0s Dominant Wind Dominant Swell	Jun Swell Consistency 0% Average Swell Height 0ft Average Swell Period 0s Dominant Wind Dominant Swell	Jul Swell Consistency 0% Average Swell Height 0ft Average Swell Period 0s Dominant Wind Dominant Swell	Aug Swell Consistency 0% Average Swell Height 0ft Average Swell Period 0s Dominant Wind Dominant Swell
Sep Swell Consistency 0% Average Swell Height 0ft Average Swell Period 0s Dominant Wind Dominant Swell	Oct Swell Consistency 0% Average Swell Height 0ft Average Swell Period 0s Dominant Wind Dominant Swell	Nov Swell Consistency 0% Average Swell Height 0ft Average Swell Period 0s Dominant Wind Dominant Swell	Dec Swell Consistency 0% Average Swell Height 0ft Average Swell Period 0s Dominant Wind Dominant Swell

Understanding this Data

These swell averages are calculated ONLY on swells of more than 7 seconds period. This means this is the average height of a swell that's likely to produce ridable surf NOT an average of every wave heading toward the beach in a month. Likewise the period is the average period OVER 7 seconds. There will be days that have short period wind swells that won't produce and ridable swell and these are excluded from the averages. The consistency figure gives the percentage of days that meet this condition.

For example if the consistency is 50% you could expect the 'average' swell for about 15 days in the month. Of course an average tells only part of the story. A combination of very large and very small swells may produce the same average as a consistent medium sized swell.