Now that the tower has closed, Buttonville is a Mandatory Frequency area. Our president has collected a series of useful links, which are summarized here and will be maintained in the future on the Useful Links page.
NAV CANADA announcement of Buttonville tower closure and map of new MF area (pdf)
Call London FIS on 123.15 for weather information from the air or on ground. Their phone number is + 1 866 992 7433 ext 3 for Ontario briefing or flight plans
NAV CANADA Aviation Weather Web Site flight planning page with links to METAR information, NOTAMs, GFAs, and other useful information
METAR and LWIS
CYKZ wind and altimeter settings — this page updates the LWIS on the METAR page, and updates many times an hour
General MF area information
The Smart Pilot Video series is also useful for some reminder information on process in Mandatory Frequency areas:
Uncontrolled Aerodrome Intro — Radio and flight procedures for landing and departing Non-Tower Aerodromes using ATF and MF
Departing a Mandatory Frequency Aerodrome
Landing at a Mandatory Frequency Aerodrome
Departing an ATF Aerodrome
Landing at an ATF Aerodrome
AeroWeather Pro (IPhone/pad app) has the LWIS for Buttonville now. You may have to pay a bit extra ($5/year subscription) plus upgrade to PRO but it is useful. You access it through the settings page in AW Pro and additional features (plus subscription).