diff --git a/lib/xmet/skew_t.py b/lib/xmet/skew_t.py
index 018f7d3..7e35304 100644
--- a/lib/xmet/skew_t.py
+++ b/lib/xmet/skew_t.py
@@ -129,3 +129,5 @@ class SkewTGraph():
 
         cr.set_source_rgb(0, 1, 0)
         self.draw_samples(cr, x, y, samples, lambda s: s.dewpoint)
+
+        cr.reset_clip()