What Gippo said, please. Doing the first four trials for thunder staff I got like seven thunder geodes. Not even all of those were due to weather; I got decent drops on the day. Flame Geodes? Not a chance, your lucky to see one flame geode every three months with how small their drop rate seems to be in comparison to all other geodes. The only other geode I find hard to get is soil (earth) but the rest drop like candy.