diff --git a/octoprint_toptemp/__init__.py b/octoprint_toptemp/__init__.py
index a5b4b62..3ed74ab 100644
--- a/octoprint_toptemp/__init__.py
+++ b/octoprint_toptemp/__init__.py
@@ -493,7 +493,7 @@ def checkCpuTempMethods(self):
                     # self._logger.debug("ERROR 1:-------------------------------------------------------------%s %s",err,code)
                     pass
                 else:
-                    if out.replace('.','',1).isdigit():
+                    if self.checkStringIsVal(out):
                         # self._logger.debug("OK-------------------------------------------------------------%s %s",out,self.tempCmds[key][0])
                         self.tempCmds[key][2] = float(out)
                     else:
@@ -729,7 +729,7 @@ def runPSUtil(self,indx,cmd,returnData = False):
     def handleCustomData(self,indx,out,time):
         self.debugOut("Got custom data: " + str(out))
         # Check
-        if isinstance(out,(float, int)) or str(out).replace('.','',1).isdigit():
+        if isinstance(out,(float, int)) or self.checkStringIsVal(out):
             resultData = [time,float(out)]
             if indx not in self.customHistory:
                 self.customHistory[indx] = []
@@ -834,7 +834,7 @@ def on_api_command(self, command, data):
                 if code or err:
                     repsonse = dict(success=False,error=err,returnCode=code,result=out)
                 else:
-                    if isinstance(out,(float, int)) or str(out).replace('.','',1).lstrip("-").isdigit():
+                    if isinstance(out,(float, int)) or self.checkStringIsVal(out):
                         repsonse = dict(success=True,error=err,returnCode=code,result=out)
                     else:
                         repsonse = dict(success=False,error="Not an value",returnCode=code,result=out)
@@ -947,6 +947,13 @@ def gCodeHandlerSent(self, comm_instance, phase, cmd, cmd_type, gcode, *args, **
 
         self.gcodeQue.put(dataSet)
 
+    def checkStringIsVal(self,inputStr):
+        inputStr = str(inputStr)
+        if inputStr[0] in ["+", "-"]:
+            inputStr = inputStr[1:]
+        return inputStr.replace('.','',1).isdigit()
+
+
 __plugin_name__ = "Top Temp"
 __plugin_pythoncompat__ = ">=2.7,<4"
 
diff --git a/octoprint_toptemp/static/js/TopTemp.js b/octoprint_toptemp/static/js/TopTemp.js
index e338ba7..cd19ead 100644
--- a/octoprint_toptemp/static/js/TopTemp.js
+++ b/octoprint_toptemp/static/js/TopTemp.js
@@ -1225,12 +1225,18 @@ $(function() {
             });
         }
 
-        self.findMinMaxAvg = function(data){
-            var items = data.length;
+        self.findMinMaxAvg = function(data,maxHis){
+            var items = 0;
+            var nowTs = Math.round(Date.now() / 1000);
             var lowValD = null;
             var highValD = null;
             var sum = 0;
             data.map(function(val,i){
+                var seconds = val[0]-nowTs;
+                if (seconds < maxHis){
+                    return false;
+                }
+                items++;
                 sum += val[1];
                 if (lowValD == null || lowValD > val[1]){
                     lowValD = val[1];
@@ -1239,7 +1245,11 @@ $(function() {
                     highValD = val[1];
                 }
             });
-            return {'low':lowValD,'high':highValD,'avg':(sum/items)}
+            var avg = null;
+            if (items > 0){
+                avg = (sum/items);
+            }
+            return {'low':lowValD,'high':highValD,'avg':avg};
         }
 
         self.updatePopover = function($thisID,$isCustom,iSettings){
@@ -1252,17 +1262,22 @@ $(function() {
             // update title by calling the original one
             mainItem.data('popover').tip().find('h3.popover-title').html(mainItem.data('popover').options.title());
 
+            var maxHis = self.popoverGHist;
+            if (iSettings.gHisSecs() > 0){
+                maxHis = 0 - iSettings.gHisSecs();
+            }
+
             // Show target/actual
             if ($('#TopTempPopoverText_'+$thisID).length){
                 if ($isCustom){
                     if ($thisID in self.customHistory){
-                        var stats = self.findMinMaxAvg(self.customHistory[$thisID]);
+                        var stats = self.findMinMaxAvg(self.customHistory[$thisID],maxHis);
                         var actual = self.customHistory[$thisID][self.customHistory[$thisID].length-1][1];
                         var output = '<div class="pull-left"><small>Current: '+self.formatTempLabel($thisID,actual,iSettings,false)+'</small></div><div class="pull-right"><small>Max: '+self.formatTempLabel($thisID,stats.high,iSettings,false)+' &middot; Min: '+self.formatTempLabel($thisID,stats.low,iSettings,false)+' &middot; Avg: '+self.formatTempLabel($thisID,stats.avg,iSettings,false)+'</small></div>';
                         $('#TopTempPopoverText_'+$thisID).html(output);
                     }
                 }else{
-                    var stats = self.findMinMaxAvg(self.tempModel.temperatures[$thisID].actual);
+                    var stats = self.findMinMaxAvg(self.tempModel.temperatures[$thisID].actual,maxHis);
                     var actual = self.tempModel.temperatures[$thisID].actual[self.tempModel.temperatures[$thisID].actual.length-1][1];
                     var target = self.tempModel.temperatures[$thisID].target[self.tempModel.temperatures[$thisID].target.length-1][1];
                     var output = '<div class="pull-left"><small>Actual: '+self.formatTempLabel($thisID,actual,iSettings,false)+'</small></div><div class="pull-right"><small>Target: ';
@@ -1300,10 +1315,6 @@ $(function() {
                 }
             }
 
-            var maxHis = self.popoverGHist;
-            if (iSettings.gHisSecs() > 0){
-                maxHis = 0 - iSettings.gHisSecs();
-            }
             // Custom data or not?
             if ($isCustom){
                 // No data?!
diff --git a/setup.py b/setup.py
index 964c762..5fe6459 100644
--- a/setup.py
+++ b/setup.py
@@ -14,7 +14,7 @@
 plugin_name = "Top Temp"
 
 # The plugin's version. Can be overwritten within OctoPrint's internal data via __plugin_version__ in the plugin module
-plugin_version = "0.0.2.1"
+plugin_version = "0.0.2.2"
 
 # The plugin's description. Can be overwritten within OctoPrint's internal data via __plugin_description__ in the plugin
 # module