Never mind Peter.
Moonphases have a direct impact in particular places subject to the influence of the moon, tidal systems and your success depend greatly on the tide which we all know is affected by the moon, something similar to what RW mentions, current, where RW fishes regularily current is everything, if there 's current then there 's good fishing.
Certain activities of the fish, like spawning are affected by the moonphase like Basswest 11 pointed out, many fish, invertebrates, reptiles and amphibians spawn or are born during the full moon but the feeding activity is not regulated by it, that is regulated by the temperature of the water which in "cold" blood creatures like fish regulates the methabolical rate, the warmer the more active the fish will be because their methabolism is fueled by the warm temperature at a cost, the animal has to feed in order to gain the energy it needs to keep up with the demands it 's own methabolism is asking for.
Barometric pressure, fish don 't feel a change in barometric pressure, water is 800+ times denser than air so a change in barometric pressure has little or no effect in water because the effect disspates in a denser environment, what makes the fish go nutz when the barometric pressure plummets is the fact that this change is associated to a drastic change in the weather conditions, if you hear that a low pressure system is moving towards you just be shure to be at your lake because you are going to catch fish specially if rain is predicted.
Air temperature does not affect water temperature unless it lasts for several days, water traps heat, the same time it took the water to warm up a couple of degrees is the same time it takes for the water to loose those degrees. Cold fronts occur because they are cause by high pressure systems associated to cold winds, the direct effect is that the skies turn blue without a single cloud in the sky, the air temperature is low but the water temperature is not. What affects you directly is the increased light penetration cause by the lack of cloud cover. Most anglers unfortunately are sight oriented and bank beaters, they like to fish what they see and are uncapable of adapting to the conditions, the lack of success is because they are not fishing where the fish are, which in those conditions is in deep cover or in deep structure.
Like Chris pointed out, if I can fish at night a full moon night is my choice, first I can see where I 'm casting my bait, also, the presence of the moon light extends the activity of the fish, so to a certain point moonphase has an impact, I agree on that......at night fishing.
Now let 's see with an example why I say that don 't pay attention to moonphase, this weekend there was full moon, if I pay attention to the moonphase ( on which solunar tables and calendars are based ) I should have had a killer day on Sunday, the calendar marked the day as "EXCELLENT"..... I caught 6 fish and it took me all the day to catch them, last week the calendar marked the day as "FAIR" .....I caught 25 fish, the water conditions were pretty much the same, the water temperature was the same, the sky was blue and cloudless both weekends, the only difference between both weekends was that the previous weekend it was windy all day long while this weekend the wind didn 't start blowing until the afternoon, that 's when I caught the fish. What made the difference ? the wind not the moonphase.
FOM, the conditions here in weather are very similar to Texas, you get a cold front there we got it three days before so we do experience cold fronts and whacky weather just like you Texans do, but I pay a lot more attention to the weather conditions and the water conditions. One of the Texan lakes I 've fished is Choke Canyon and man, if it 's windy in MacAllen it 's going to be crazy windy at Choke Canyon. The scariest boat ride I 've ever had in my life was at Choke Canyon three years ago in late July with my cousin.