Why You Should Use Google Trends To Pinpoint Search Trends
Since most keyword tools just provide average month search volumes, seasonal variations in search volume are too often overlooked. The Google Adwords keyword tool can be adjusted to show search volume by month, but Google Trends offers an easier and more dynamic way to view search volume trends.
These screenshots show how dramatic the difference in keyword search volume can be from month to month.
Bottom line: Don’t forget to check a keyword’s seasonal trends and adjust your SEO strategy accordingly!