The weather is usually fine around Dec-Apr (middle of the dry season right now), as the dry season is underway. Typhoons normally over in the north by November. Cooler water (27-29), cooler evenings/hot days and much less precipitation - so visibility is best. There can be afternoon wind. From April, the wet season begins - more thunder storms in the evenings, extending as the season progresses until there is more rain/cloud during the day. Typhoons can start around Jun/Jul until Oct/Nov - whilst they can cause worse viz/surface conditions, they need to be passing near-directly overhead to limit diving in Subic (it's a very protected bay). Most years, we only lose 4-5 days of diving due to the weather.
Side-note/off-topic: Johan's is on Baloy Beach. There's not really any 'girlie bars' in that area. All those bars are on Barretto Beach, along the main highway some 600m walk from Johan's. You might see older foreigners in the company of younger girls, but you aren't confronted by the bars themselves. Don't make snap-judgments about the relationships you're seeing though, some of those mixed-age 'couples' are married etc...
We are non judgemental in that regard. We have but one rule "Consenting Adults". If that rule applies, what they do or are to each other is non of our business and nor should we judge them. If they find happiness then that's great. As I say "Life is far too short, enjoy it while you can"
If we flew to manila, do we then fly to Coron?