diff --git a/lib/xmet/skew_t.py b/lib/xmet/skew_t.py
index d3f1e6d..dfe6a6e 100644
--- a/lib/xmet/skew_t.py
+++ b/lib/xmet/skew_t.py
@@ -118,8 +118,8 @@ class SkewTGraph():
             sx, sy = self.sample_to_screen(temp, pressure)
 
             if sx_last is not None:
-                cr.move_to(x + sx, y + sy)
-                cr.line_to(x + sx_last, y + sy_last)
+                cr.move_to(x + sx_last, y + sy_last)
+                cr.line_to(x + sx, y + sy)
                 cr.stroke()
 
             sx_last = sx