diff --git a/lib/xmet/rawins.py b/lib/xmet/rawins.py
index 9f675d6..9a463bd 100644
--- a/lib/xmet/rawins.py
+++ b/lib/xmet/rawins.py
@@ -64,7 +64,7 @@ class RawinsObs():
             temp = None
         else:
             tenths = int(value[2])
-            sign   = -1 if tenths % 1 == 0 else 1
+            sign   = 1 if tenths % 2 == 0 else -1
 
             temp = sign * 0.1 * float(value[0:3])