normally rain is nerfing xboews in real. the himid rain has effect on composite horn bows of xbows and bows made of composit material (hunting xbow, light xbow, crossbow,nomad bow, strong bow and khergit bow) they lose range and penetration energy and with that projectile speed decrease and accuracy decrease. rain has also effect on moving speed there due to the mud u cant move that fast. in history these factors turned battles in the 100 years war for example the battle of agincourt (where french crossbow men were uneffective due to rain factor) and the battle of crecy where french heavy armored knights were dieing in mud and were shot by longbowmen due to their slow movement speed.
make it that rain only effects movement speed, hunting xbow, light xbow, crossbow, khergit bow, nomad bow and strongbow