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If rain days times rain amount in millimeters equals more than 1000 in a month, it's wet I'd say. For it to be dry, the rain needs to be less than 35mm and rain days less than 8.
It depends on whether the month is in the growing season or not, and it also further depends on the temperature, sunshine and the soil type, but generally >250 mm is wet and <75 mm is dry for growing season and >75 mm is wet and <25 mm is dry for outside of growing season.
For example, during the summer and in the middle of winter (which are the driest seasons in here), even a couple of rainy days per week and 70 mm/month seem like "a rainy month". For example, we had our rainiest July of the last 20 years in 2015, and we recorded 92 mm of rain and 12 rainy days (*in July the most of rainy days have just a rain shower in the evening, they are not overcast days*). That time we complained a lot because that July was extremely wet and not enough summer-like for us. On the other hand, a really dry month in our dry seasons can also means nearly no precipitations for the whole month. If I had to give a limit for a dry month, I would say no more than 4 rainy days and less than 20 mm of rain (which is more or less the limit after which we have to give water to our garden in order to don't make it turn yellow).
For the wet seasons (Spring and Autumn), my perceptions are kinda different. For example it hasn't rained for one week and an half right now, and to me it seems like a really dry start for March. In general, in these periods a wet month can have 15 or more rainy days, and rain amounts of 120 mm or more. In the wetter seasons, I would say that less than 50 mm of rain and less of 5 rainy days would sound like a quite dry month.
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