diff --git a/.env b/.env
index 1390a1f..79e78c6 100644
--- a/.env
+++ b/.env
@@ -28,6 +28,7 @@ MINIO_BROWSER_REDIRECT_URL=${NGINX_PROTOCOL}://${NGINX_HOST}:${NGINX_HTTP_PORT}/
 
 UI_PORT=3000
 API_PORT=5000
+API_METAR_TIME_OFFSET=3000
 
 SSL_CA_NAME=ca
 SSL_CA_PATH=../ssl/${SSL_CA_NAME}.pem
diff --git a/api/src/metars/model.rs b/api/src/metars/model.rs
index 658fc37..2967480 100644
--- a/api/src/metars/model.rs
+++ b/api/src/metars/model.rs
@@ -2,6 +2,7 @@ use crate::error::Error;
 use crate::{error::ApiResult, db};
 use chrono::{DateTime, Datelike, Utc};
 use std::collections::HashSet;
+use std::env;
 use redis::{AsyncCommands, RedisResult};
 use reqwest::Client;
 use serde::{Deserialize, Serialize};
@@ -49,6 +50,8 @@ pub struct Metar {
   pub humidity: Option<f64>,
   #[serde(skip_serializing_if = "Option::is_none")]
   pub density_altitude: Option<f64>,
+  #[serde(skip_serializing_if = "Option::is_none")]
+  pub no_significant_changes: Option<bool>,
 }
 
 #[derive(Serialize, Deserialize, Debug)]
@@ -193,6 +196,7 @@ impl Default for Metar {
       precip_in: None,
       humidity: None,
       density_altitude: None,
+      no_significant_changes: None,
     }
   }
 }
@@ -655,6 +659,12 @@ impl Metar {
         metar_parts.remove(0);
       }
 
+      // No significant changes
+      if !metar_parts.is_empty() && metar_parts[0] == "NOSIG" {
+        metar.no_significant_changes = Some(true);
+        metar_parts.remove(0);
+      }
+
       // Remarks
       if !metar_parts.is_empty() && metar_parts[0] == "RMK" {
         metar_parts.remove(0);
@@ -837,8 +847,12 @@ impl Metar {
     for difference in db_metars_set.symmetric_difference(&station_icaos_set) {
       missing_metar_icaos.push(difference.to_string());
     }
+    let time_offset = env::var("API_METAR_TIME_OFFSET")
+      .unwrap_or("3000".to_string())
+      .parse::<i64>()
+      .unwrap_or(3000);
     for metar in db_metars {
-      if current_time > (metar.observation_time.timestamp() + 3600) {
+      if current_time > (metar.observation_time.timestamp() + time_offset) {
         log::trace!("{} METAR data is outdated", metar.station_id);
         missing_metar_icaos.push(metar.station_id.to_string());
       }
@@ -920,9 +934,9 @@ impl Metar {
       "#,
         TABLE_NAME
       ))
-        .bind(icao_list)
-        .fetch_all(pool)
-        .await?;
+      .bind(icao_list)
+      .fetch_all(pool)
+      .await?;
       metars = metar_rows
         .into_iter()
         .filter_map(|metar_db| Metar::from_db(metar_db).ok())