diff --git a/rain/rain.lua b/rain/rain.lua
index d6b8a97..24569cd 100644
--- a/rain/rain.lua
+++ b/rain/rain.lua
@@ -31,7 +31,7 @@ end
 rain.add_rain_particles = function(player, dtime)
   rain.last_rp_count = 0
   for i=rain.particles_count, 1,-1 do
-    local random_pos_x, random_pos_y, random_pos_z = get_random_pos_by_player_look_dir(player)
+    local random_pos_x, random_pos_y, random_pos_z = weather.get_random_pos_by_player_look_dir(player)
     if minetest.get_node_light({x=random_pos_x, y=random_pos_y, z=random_pos_z}, 0.5) == 15 then
       rain.last_rp_count = rain.last_rp_count + 1
       minetest.add_particle({
@@ -136,7 +136,7 @@ end)
 rain.make_weather = function()
   rain.raining = true
   for _, player in ipairs(minetest.get_connected_players()) do
-    if (is_underwater(player)) then 
+    if (weather.is_underwater(player)) then 
       return false
     end
     rain.add_player(player)
diff --git a/snow/snow.lua b/snow/snow.lua
index f980a3f..c83ff53 100644
--- a/snow/snow.lua
+++ b/snow/snow.lua
@@ -6,8 +6,8 @@ snow.particles_count = 25
 snow.add_rain_particles = function(player, dtime)
   rain.last_rp_count = 0
   for i=snow.particles_count, 1,-1 do
-    local random_pos_x, random_pos_y, random_pos_z = get_random_pos_by_player_look_dir(player)
-    random_pos_y = math.random() + random_pos(player:getpos().y - 1, player:getpos().y + 7)
+    local random_pos_x, random_pos_y, random_pos_z = weather.get_random_pos_by_player_look_dir(player)
+    random_pos_y = math.random() + math.random(player:getpos().y - 1, player:getpos().y + 7)
     if minetest.get_node_light({x=random_pos_x, y=random_pos_y, z=random_pos_z}, 0.5) == 15 then
       rain.last_rp_count = rain.last_rp_count + 1
       minetest.add_particle({
@@ -43,7 +43,7 @@ minetest.register_globalstep(function(dtime)
   end
   
   for _, player in ipairs(minetest.get_connected_players()) do
-    if (is_underwater(player)) then 
+    if (weather.is_underwater(player)) then 
       return false
     end
     snow.add_rain_particles(player, dtime)
diff --git a/weather_core/weather_core.lua b/weather_core/weather_core.lua
index 1ae4208..0e2b265 100644
--- a/weather_core/weather_core.lua
+++ b/weather_core/weather_core.lua
@@ -47,7 +47,7 @@ end
 
 -- checks if player is undewater. This is needed in order to
 -- turn off weather particles generation.
-function is_underwater(player)
+weather.is_underwater = function(player)
     local ppos = player:getpos()
     local offset = player:get_eye_offset()
     local player_eye_pos = {x = ppos.x + offset.x, 
@@ -60,17 +60,9 @@ function is_underwater(player)
     return false
 end
 
--- returns random number between a and b.
-function random_pos(a, b)
-  if (a > b) then
-    return math.random(b, a);
-  end
-  return math.random(a, b);
-end
-
 -- trying to locate position for particles by player look direction for performance reason.
 -- it is costly to generate many particles around player so goal is focus mainly on front view.  
-function get_random_pos_by_player_look_dir(player)
+weather.get_random_pos_by_player_look_dir = function(player)
   local look_dir = player:get_look_dir()
   local player_pos = player:getpos()
 
@@ -96,7 +88,7 @@ function get_random_pos_by_player_look_dir(player)
     end
   end
 
-  random_pos_y = math.random() + random_pos(player_pos.y + 1, player_pos.y + 7)
+  random_pos_y = math.random() + math.random(player_pos.y + 1, player_pos.y + 7)
   return random_pos_x, random_pos_y, random_pos_z
 end