Filter the holiday snow JavaScript URL.
jetpack_holiday_snow_js_url
jetpack_holiday_snow_js_url-
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action jetpack_holiday_snowingFires when it’s snowing.
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filter jetpack_holiday_chance_of_snowAllow holiday snow.Note: there’s no actual randomness involved in whether it snows or not, despite the filter mentioning a “chance of snow.”
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filter tiled_gallery_content_widthFilter overwriting the default content width.
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filter jetpack_tiled_gallery_shortcode_redefinedFilter the output of the check for another plugin or theme affecting WordPress galleries. This will let folks that replace core’s shortcode confirm feature parity with it, so Jetpack’s Tiled Galleries can still work.
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filter jetpack_tiled_gallery_typesFilters the permissible Tiled Gallery types.
Jetpack Developer Resources 