diff --git a/ds18b20.py b/ds18b20.py
index 5c4e33b..f80cf39 100755
--- a/ds18b20.py
+++ b/ds18b20.py
@@ -41,8 +41,17 @@
 def read_probe():
 
     probe = open("/sys/bus/w1/devices/%s/w1_slave" % DS18B20_ID)
-    temp = float(probe.readlines()[-1].split()[-1].split("=")[-1])/1000         # Parse probe output
-    globals.CURRENT_TEMP = int(round((temp * 9/5) +32))                         # Convert C-F and round into an integer
+    temp = float(probe.readlines()[-1].split()[-1].split("=")[-1])/1000  # Parse probe output
+    temp = int(round((temp * 9/5) +32))                                  # Convert C-F and round into an integer
+
+    # 1-wire interfaces (like the DS18B20 uses) can occasionally
+    # return wildly wrong results.  For this reason, we throw away
+    # values that have changed more than 10 degrees since the last
+    # reading, since that's almost certainly noise.
+
+    if abs(temp - globals.CURRENT_TEMP) <= 10:
+        globals.CURRENT_TEMP = temp
+
     probe.close()