diff --git a/src/humidity/core.clj b/src/humidity/core.clj
index 4a8c768..3bd4857 100644
--- a/src/humidity/core.clj
+++ b/src/humidity/core.clj
@@ -39,7 +39,6 @@
              relative-humidity saturation-vapour-pressure temperature
              temperature-celsius temperature-kelvin volume
              wet-bulb-temperature-celsius] :as packet}]
-  (println packet)
   (if temperature (resolve-humidity
                    (assoc (dissoc packet :temperature)
                           :temperature-celsius temperature))
@@ -61,9 +60,10 @@
                                    (relative-humidity-fn packet))
               :saturation-vapour-pressure (when-not saturation-vapour-pressure
                                             (saturation-vapour-pressure-fn packet))
-              :temperature-celsius (when
-                                    (and temperature-kelvin
-                                         (not temperature-celsius))
+              :temperature-celsius (cond
+                                     temperature temperature
+                                     (and temperature-kelvin
+                                          (not temperature-celsius))
                                      (- temperature-kelvin celsius-offset))
               :temperature-kelvin (when
                                    (and temperature-celsius
@@ -81,3 +81,45 @@
     (let [p' (resolve-humidity p)]
       (if (= (keys p) (keys p')) p
           (recur p')))))
+
+(defn validation-error
+  [key limit a b]
+  (let [m (max a b)
+        error (abs (float (/ (compare a b) (if (zero? m) 0.000001 m) (/ limit 100))))]
+    (if (> error limit)
+      (do
+        (println (format "ERROR: key: %s; a: %s; b %s; errror: %s%%." key a b error))
+        false)
+      true)))
+
+(def ^:dynamic
+  *validation-limit*
+  "Percentage limit for discrepancies in values during validation."
+  1)
+
+(defn validate
+  "Validate a packet by recalculating each value. Discrepancies within 
+   `*validation-limit*`% will be ignored."
+  [& {:keys [pressure-millibars pressure-pascals temperature-celsius
+             temperature-kelvin] :as packet}]
+  (let [v (?assoc (into (sorted-map) packet)
+                  :absolute-humidity (absolute-humidity-fn packet)
+                  :actual-vapour-pressure (actual-vapour-pressure-fn packet)
+                  :dew-point-celsius (dew-point-celsius-fn packet)
+                  :pressure-pascals (if pressure-millibars
+                                      (* pressure-millibars 100) Pa)
+                  :pressure-millibars (if pressure-pascals
+                                        (float (/ pressure-pascals 100))
+                                        (float (/ Pa 100)))
+                  :relative-humidity (relative-humidity-fn packet)
+                  :saturation-vapour-pressure
+                  (saturation-vapour-pressure-fn packet)
+                  :temperature-celsius (- temperature-kelvin celsius-offset)
+                  :temperature-kelvin (+ temperature-celsius celsius-offset)
+                  :volume (volume-fn packet)
+                  :wet-bulb-temperature-celsius
+                  (wet-bulb-temperature-celsius-fn packet))]
+    (empty?
+     (remove true?
+             (map #(validation-error % *validation-limit* (packet %) (v %))
+                  (keys packet))))))
\ No newline at end of file
diff --git a/test/humidity/core_test.clj b/test/humidity/core_test.clj
index ca007fe..fca45ee 100644
--- a/test/humidity/core_test.clj
+++ b/test/humidity/core_test.clj
@@ -1,7 +1,7 @@
 (ns humidity.core-test
   (:require
    [clojure.test :refer [deftest is testing]]
-   [humidity.core :refer [resolution]]))
+   [humidity.core :refer [resolution validate]]))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;;
@@ -40,3 +40,32 @@
         packet {:relative-humidity 100 :temperature-celsius 35}
         actual (resolution packet)]
     (is (= actual expected))))
+
+(deftest validation-test
+  (testing "validation"
+    (let [expected true
+          actual (validate {:absolute-humidity 3953.618101887827,
+                            :actual-vapour-pressure 4765.10094206357,
+                            :dew-point-celsius 35.00000000000001,
+                            :pressure-millibars 1013.25,
+                            :pressure-pascals 101325,
+                            :relative-humidity 100,
+                            :saturation-vapour-pressure 5622.488734516426,
+                            :temperature-celsius 35,
+                            :temperature-kelvin 308.15,
+                            :volume 1.1281347245103424,
+                            :wet-bulb-temperature-celsius 35.11625928298915})]
+      (is (= actual expected)))
+    (let [expected false
+          actual (validate {:absolute-humidity 3953.618101887827,
+                            :actual-vapour-pressure 4765.10094206357,
+                            :dew-point-celsius 35.00000000000001,
+                            :pressure-millibars 1013.25,
+                            :pressure-pascals 101325,
+                            :relative-humidity 95, ;; <-- deliberately wrong
+                            :saturation-vapour-pressure 5622.488734516426,
+                            :temperature-celsius 35,
+                            :temperature-kelvin 308.15,
+                            :volume 1.1281347245103424,
+                            :wet-bulb-temperature-celsius 35.11625928298915})]
+      (is (= actual expected)))))
\ No newline at end of file
diff --git a/test/humidity/dew_point_test.clj b/test/humidity/dew_point_test.clj
index 95f5a76..099c2a2 100644
--- a/test/humidity/dew_point_test.clj
+++ b/test/humidity/dew_point_test.clj
@@ -1,6 +1,5 @@
 (ns humidity.dew-point-test
   (:require [clojure.test :refer [deftest is testing]]
-            [humidity.constants :refer [celsius-offset]]
             [humidity.dew-point-celsius :refer [dew-point-celsius-fn]]))
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;;
diff --git a/test/humidity/relative_test.clj b/test/humidity/relative_test.clj
index fbf5acd..5794aee 100644
--- a/test/humidity/relative_test.clj
+++ b/test/humidity/relative_test.clj
@@ -1,7 +1,7 @@
 (ns humidity.relative-test
   (:require [clojure.test :refer [deftest is testing]]
             [humidity.constants :refer [celsius-offset]]
-            [humidity.relative-humidity :refer [relative-humidity-fn relative-humidity-fn]]))
+            [humidity.relative-humidity :refer [relative-humidity-fn]]))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;;