diff --git a/src/Forecast/Serializer/ForecastPeriodNormalizer.php b/src/Forecast/Serializer/ForecastPeriodNormalizer.php
index 70dc9cc..d6b8239 100644
--- a/src/Forecast/Serializer/ForecastPeriodNormalizer.php
+++ b/src/Forecast/Serializer/ForecastPeriodNormalizer.php
@@ -5,6 +5,7 @@
 namespace BomWeather\Forecast\Serializer;
 
 use BomWeather\Forecast\ForecastPeriod;
+use BomWeather\Trait\WeatherDataAccessorTrait;
 use BomWeather\Util\BaseNormalizer;
 
 /**
@@ -12,6 +13,8 @@
  */
 class ForecastPeriodNormalizer extends BaseNormalizer {
 
+  use WeatherDataAccessorTrait;
+
   protected string|array $supportedInterfaceOrClass = ForecastPeriod::class;
 
   /**
@@ -57,24 +60,14 @@ public function denormalize($data, $type, $format = NULL, array $context = []) {
    *   The period.
    */
   protected function setElementValue(array $element, ForecastPeriod $period): void {
-    switch ($element['@type']) {
-      case 'forecast_icon_code':
-        $period->setIconCode($element['#']);
-        break;
-
-      case 'air_temperature_minimum':
-        $period->setAirTempMinimum((int) $element['#']);
-        break;
-
-      case 'air_temperature_maximum':
-        $period->setAirTempMaximum((int) $element['#']);
-        break;
-
-      case 'precipitation_range':
-        $period->setPrecipitationRange($element['#']);
-        break;
-
-    }
+    $value = $this->accessWeatherData($element, '#');
+    match ($element['@type']) {
+      'forecast_icon_code' => $period->setIconCode($value),
+      'air_temperature_minimum' => $period->setAirTempMinimum((int) $value),
+      'air_temperature_maximum' => $period->setAirTempMaximum((int) $value),
+      'precipitation_range' => $period->setPrecipitationRange($value),
+      default => '',
+    };
   }
 
   /**
@@ -86,40 +79,18 @@ protected function setElementValue(array $element, ForecastPeriod $period): void
    *   The period.
    */
   public function setTextValue(array $text, ForecastPeriod $period): void {
-    switch ($text['@type']) {
-      case 'precis':
-        $period->setPrecis($text['#']);
-        break;
-
-      case 'probability_of_precipitation':
-        $period->setProbabilityOfPrecipitation($text['#']);
-        break;
-
-      case 'forecast':
-        $period->setForecast($text['#']);
-        break;
-
-      case 'uv_alert':
-        $period->setUvAlert($text['#']);
-        break;
-
-      case 'forecast_seas':
-        $period->setSeas($text['#']);
-        break;
-
-      case 'forecast_swell1':
-        $period->setSwell($text['#']);
-        break;
-
-      case 'forecast_weather':
-        $period->setWeather($text['#']);
-        break;
-
-      case 'forecast_winds':
-        $period->setWinds($text['#']);
-        break;
-
-    }
+    $value = $this->accessWeatherData($text, '#');
+    match ($text['@type']) {
+      'precis' => $period->setPrecis($value),
+      'probability_of_precipitation' => $period->setProbabilityOfPrecipitation($value),
+      'forecast' => $period->setForecast($value),
+      'uv_alert' => $period->setUvAlert($value),
+      'forecast_seas' => $period->setSeas($value),
+      'forecast_swell1' => $period->setSwell($value),
+      'forecast_weather' => $period->setWeather($value),
+      'forecast_winds' => $period->setWinds($value),
+      default => '',
+    };
   }
 
 }
diff --git a/src/Trait/WeatherDataAccessorTrait.php b/src/Trait/WeatherDataAccessorTrait.php
new file mode 100644
index 0000000..9349d5d
--- /dev/null
+++ b/src/Trait/WeatherDataAccessorTrait.php
@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace BomWeather\Trait;
+
+/**
+ * Trait to provide general data validation and access methods.
+ */
+trait WeatherDataAccessorTrait {
+
+  /**
+   * Access the weather data attribute from weather data array.
+   *
+   * @param array|null $weatherData
+   *   Array of weather data.
+   * @param string $key
+   *   Array key to fetch the data.
+   */
+  public function accessWeatherData(?array $weatherData, string $key): mixed {
+    if (!$weatherData) {
+      return NULL;
+    }
+    if (!\array_key_exists($key, $weatherData)) {
+      return '';
+    }
+    return $weatherData[$key] ?? '';
+  }
+
+}
diff --git a/src/Warning/Serializer/WarningInfoNormalizer.php b/src/Warning/Serializer/WarningInfoNormalizer.php
index 11a068a..5606faa 100644
--- a/src/Warning/Serializer/WarningInfoNormalizer.php
+++ b/src/Warning/Serializer/WarningInfoNormalizer.php
@@ -4,6 +4,7 @@
 
 namespace BomWeather\Warning\Serializer;
 
+use BomWeather\Trait\WeatherDataAccessorTrait;
 use BomWeather\Util\BaseNormalizer;
 use BomWeather\Warning\WarningInfo;
 use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
@@ -13,6 +14,8 @@
  */
 class WarningInfoNormalizer extends BaseNormalizer {
 
+  use WeatherDataAccessorTrait;
+
   /**
    * {@inheritdoc}
    */
@@ -52,13 +55,14 @@ public function denormalize($data, $type, $format = NULL, array $context = []) {
    *   The warning info.
    */
   public function setTextValue(array $text, WarningInfo $warningInfo): void {
+    $value = $this->accessWeatherData($text, '#');
     match ($text['@type']) {
-      'warning_title' => $warningInfo->setWarningTitle($text['#']),
-      'preamble' => $warningInfo->setPreamble($text['#']),
+      'warning_title' => $warningInfo->setWarningTitle($value),
+      'preamble' => $warningInfo->setPreamble($value),
       'warning_advice' => \array_map(function ($advice) use ($warningInfo): void {
         $warningInfo->setWarningAdvice($advice);
-      }, $text['p']),
-      'warning_next_issue' => $warningInfo->setWarningNextIssue($text['#']),
+      }, $this->accessWeatherData($text, 'p')),
+      'warning_next_issue' => $warningInfo->setWarningNextIssue($value),
       default => '',
     };
   }