diff --git a/apps/esmtool/record.cpp b/apps/esmtool/record.cpp
index b13668dafc..e293055919 100644
--- a/apps/esmtool/record.cpp
+++ b/apps/esmtool/record.cpp
@@ -1201,16 +1201,10 @@ namespace EsmTool
         std::cout << "  Name: " << mData.mName << std::endl;
 
         std::cout << "  Weather:" << std::endl;
-        std::cout << "    Clear: " << (int)mData.mData.mClear << std::endl;
-        std::cout << "    Cloudy: " << (int)mData.mData.mCloudy << std::endl;
-        std::cout << "    Foggy: " << (int)mData.mData.mFoggy << std::endl;
-        std::cout << "    Overcast: " << (int)mData.mData.mOvercast << std::endl;
-        std::cout << "    Rain: " << (int)mData.mData.mOvercast << std::endl;
-        std::cout << "    Thunder: " << (int)mData.mData.mThunder << std::endl;
-        std::cout << "    Ash: " << (int)mData.mData.mAsh << std::endl;
-        std::cout << "    Blight: " << (int)mData.mData.mBlight << std::endl;
-        std::cout << "    Snow: " << (int)mData.mData.mSnow << std::endl;
-        std::cout << "    Blizzard: " << (int)mData.mData.mBlizzard << std::endl;
+        std::array<std::string_view, 10> weathers
+            = { "Clear", "Cloudy", "Fog", "Overcast", "Rain", "Thunder", "Ash", "Blight", "Snow", "Blizzard" };
+        for (size_t i = 0; i < weathers.size(); ++i)
+            std::cout << "    " << weathers[i] << ": " << mData.mData.mProbabilities[i] << std::endl;
         std::cout << "  Map Color: " << mData.mMapColor << std::endl;
         if (!mData.mSleepList.empty())
             std::cout << "  Sleep List: " << mData.mSleepList << std::endl;
diff --git a/apps/opencs/model/tools/regioncheck.cpp b/apps/opencs/model/tools/regioncheck.cpp
index 4affc1bd44..08e8a17714 100644
--- a/apps/opencs/model/tools/regioncheck.cpp
+++ b/apps/opencs/model/tools/regioncheck.cpp
@@ -47,9 +47,7 @@ void CSMTools::RegionCheckStage::perform(int stage, CSMDoc::Messages& messages)
     /// \todo test that the ID in mSleeplist exists
 
     // test that chances add up to 100
-    int chances = region.mData.mClear + region.mData.mCloudy + region.mData.mFoggy + region.mData.mOvercast
-        + region.mData.mRain + region.mData.mThunder + region.mData.mAsh + region.mData.mBlight + region.mData.mSnow
-        + region.mData.mBlizzard;
+    auto chances = std::accumulate(region.mData.mProbabilities.begin(), region.mData.mProbabilities.end(), 0u);
     if (chances != 100)
         messages.add(id, "Weather chances do not add up to 100", "", CSMDoc::Message::Severity_Error);
 
diff --git a/apps/opencs/model/world/nestedcoladapterimp.cpp b/apps/opencs/model/world/nestedcoladapterimp.cpp
index 0f3670431d..1f9958e84e 100644
--- a/apps/opencs/model/world/nestedcoladapterimp.cpp
+++ b/apps/opencs/model/world/nestedcoladapterimp.cpp
@@ -1076,31 +1076,8 @@ namespace CSMWorld
         }
         else if (subColIndex == 1)
         {
-            switch (subRowIndex)
-            {
-                case 0:
-                    return region.mData.mClear;
-                case 1:
-                    return region.mData.mCloudy;
-                case 2:
-                    return region.mData.mFoggy;
-                case 3:
-                    return region.mData.mOvercast;
-                case 4:
-                    return region.mData.mRain;
-                case 5:
-                    return region.mData.mThunder;
-                case 6:
-                    return region.mData.mAsh;
-                case 7:
-                    return region.mData.mBlight;
-                case 8:
-                    return region.mData.mSnow;
-                case 9:
-                    return region.mData.mBlizzard;
-                default:
-                    break;
-            }
+            if (subRowIndex >= 0 && subRowIndex < region.mData.mProbabilities.size())
+                return region.mData.mProbabilities[subRowIndex];
         }
 
         throw std::runtime_error("index out of range");
@@ -1110,45 +1087,11 @@ namespace CSMWorld
         Record<ESM::Region>& record, const QVariant& value, int subRowIndex, int subColIndex) const
     {
         ESM::Region region = record.get();
-        unsigned char chance = static_cast<unsigned char>(value.toInt());
+        uint8_t chance = static_cast<uint8_t>(value.toInt());
 
         if (subColIndex == 1)
         {
-            switch (subRowIndex)
-            {
-                case 0:
-                    region.mData.mClear = chance;
-                    break;
-                case 1:
-                    region.mData.mCloudy = chance;
-                    break;
-                case 2:
-                    region.mData.mFoggy = chance;
-                    break;
-                case 3:
-                    region.mData.mOvercast = chance;
-                    break;
-                case 4:
-                    region.mData.mRain = chance;
-                    break;
-                case 5:
-                    region.mData.mThunder = chance;
-                    break;
-                case 6:
-                    region.mData.mAsh = chance;
-                    break;
-                case 7:
-                    region.mData.mBlight = chance;
-                    break;
-                case 8:
-                    region.mData.mSnow = chance;
-                    break;
-                case 9:
-                    region.mData.mBlizzard = chance;
-                    break;
-                default:
-                    throw std::runtime_error("index out of range");
-            }
+            region.mData.mProbabilities.at(subRowIndex) = chance;
 
             record.setModified(region);
         }
diff --git a/apps/openmw/mwbase/world.hpp b/apps/openmw/mwbase/world.hpp
index e5499f6680..14e3b2b3b7 100644
--- a/apps/openmw/mwbase/world.hpp
+++ b/apps/openmw/mwbase/world.hpp
@@ -232,7 +232,7 @@ namespace MWBase
 
         virtual void setMoonColour(bool red) = 0;
 
-        virtual void modRegion(const ESM::RefId& regionid, const std::vector<char>& chances) = 0;
+        virtual void modRegion(const ESM::RefId& regionid, const std::vector<uint8_t>& chances) = 0;
 
         virtual void changeToInteriorCell(
             std::string_view cellName, const ESM::Position& position, bool adjustPlayerPos, bool changeEvent = true)
diff --git a/apps/openmw/mwscript/skyextensions.cpp b/apps/openmw/mwscript/skyextensions.cpp
index 39944970bf..d2b41fb87a 100644
--- a/apps/openmw/mwscript/skyextensions.cpp
+++ b/apps/openmw/mwscript/skyextensions.cpp
@@ -102,11 +102,11 @@ namespace MWScript
                 std::string_view region{ runtime.getStringLiteral(runtime[0].mInteger) };
                 runtime.pop();
 
-                std::vector<char> chances;
+                std::vector<uint8_t> chances;
                 chances.reserve(10);
                 while (arg0 > 0)
                 {
-                    chances.push_back(std::clamp(runtime[0].mInteger, 0, 127));
+                    chances.push_back(std::clamp(runtime[0].mInteger, 0, 100));
                     runtime.pop();
                     arg0--;
                 }
diff --git a/apps/openmw/mwworld/weather.cpp b/apps/openmw/mwworld/weather.cpp
index 3338acd832..0da70bdd48 100644
--- a/apps/openmw/mwworld/weather.cpp
+++ b/apps/openmw/mwworld/weather.cpp
@@ -285,19 +285,8 @@ namespace MWWorld
 
     RegionWeather::RegionWeather(const ESM::Region& region)
         : mWeather(invalidWeatherID)
-        , mChances()
+        , mChances(region.mData.mProbabilities.begin(), region.mData.mProbabilities.end())
     {
-        mChances.reserve(10);
-        mChances.push_back(region.mData.mClear);
-        mChances.push_back(region.mData.mCloudy);
-        mChances.push_back(region.mData.mFoggy);
-        mChances.push_back(region.mData.mOvercast);
-        mChances.push_back(region.mData.mRain);
-        mChances.push_back(region.mData.mThunder);
-        mChances.push_back(region.mData.mAsh);
-        mChances.push_back(region.mData.mBlight);
-        mChances.push_back(region.mData.mSnow);
-        mChances.push_back(region.mData.mBlizzard);
     }
 
     RegionWeather::RegionWeather(const ESM::RegionWeatherState& state)
@@ -313,19 +302,9 @@ namespace MWWorld
         return state;
     }
 
-    void RegionWeather::setChances(const std::vector<char>& chances)
+    void RegionWeather::setChances(const std::vector<uint8_t>& chances)
     {
-        if (mChances.size() < chances.size())
-        {
-            mChances.reserve(chances.size());
-        }
-
-        int i = 0;
-        for (char chance : chances)
-        {
-            mChances[i] = chance;
-            i++;
-        }
+        mChances = chances;
 
         // Regional weather no longer supports the current type, select a new weather pattern.
         if ((static_cast<size_t>(mWeather) >= mChances.size()) || (mChances[mWeather] == 0))
@@ -357,15 +336,14 @@ namespace MWWorld
         // If chances A and B has values 30 and 70 then by generating 100 numbers 1..100, 30% will be lesser or equal 30
         // and 70% will be greater than 30 (in theory).
         auto& prng = MWBase::Environment::get().getWorld()->getPrng();
-        int chance = Misc::Rng::rollDice(100, prng) + 1; // 1..100
-        int sum = 0;
-        int i = 0;
-        for (; static_cast<size_t>(i) < mChances.size(); ++i)
+        unsigned int chance = static_cast<unsigned int>(Misc::Rng::rollDice(100, prng) + 1); // 1..100
+        unsigned int sum = 0;
+        for (size_t i = 0; i < mChances.size(); ++i)
         {
             sum += mChances[i];
             if (chance <= sum)
             {
-                mWeather = i;
+                mWeather = static_cast<int>(i);
                 return;
             }
         }
@@ -649,7 +627,7 @@ namespace MWWorld
         }
     }
 
-    void WeatherManager::modRegion(const ESM::RefId& regionID, const std::vector<char>& chances)
+    void WeatherManager::modRegion(const ESM::RefId& regionID, const std::vector<uint8_t>& chances)
     {
         // Sets the region's probability for various weather patterns. Note that this appears to be saved permanently.
         // In Morrowind, this seems to have the following behavior when applied to the current region:
diff --git a/apps/openmw/mwworld/weather.hpp b/apps/openmw/mwworld/weather.hpp
index 57c69cde11..65f926c096 100644
--- a/apps/openmw/mwworld/weather.hpp
+++ b/apps/openmw/mwworld/weather.hpp
@@ -230,7 +230,7 @@ namespace MWWorld
 
         operator ESM::RegionWeatherState() const;
 
-        void setChances(const std::vector<char>& chances);
+        void setChances(const std::vector<uint8_t>& chances);
 
         void setWeather(int weatherID);
 
@@ -238,7 +238,7 @@ namespace MWWorld
 
     private:
         int mWeather;
-        std::vector<char> mChances;
+        std::vector<uint8_t> mChances;
 
         void chooseNewWeather();
     };
@@ -286,7 +286,7 @@ namespace MWWorld
          * @param ID of the weather setting to shift to
          */
         void changeWeather(const ESM::RefId& regionID, const unsigned int weatherID);
-        void modRegion(const ESM::RefId& regionID, const std::vector<char>& chances);
+        void modRegion(const ESM::RefId& regionID, const std::vector<uint8_t>& chances);
         void playerTeleported(const ESM::RefId& playerRegion, bool isExterior);
 
         /**
diff --git a/apps/openmw/mwworld/worldimp.cpp b/apps/openmw/mwworld/worldimp.cpp
index b9bf454895..5be1e52530 100644
--- a/apps/openmw/mwworld/worldimp.cpp
+++ b/apps/openmw/mwworld/worldimp.cpp
@@ -1879,7 +1879,7 @@ namespace MWWorld
         mWeatherManager->changeWeather(region, id);
     }
 
-    void World::modRegion(const ESM::RefId& regionid, const std::vector<char>& chances)
+    void World::modRegion(const ESM::RefId& regionid, const std::vector<uint8_t>& chances)
     {
         mWeatherManager->modRegion(regionid, chances);
     }
diff --git a/apps/openmw/mwworld/worldimp.hpp b/apps/openmw/mwworld/worldimp.hpp
index 46043afe46..4b9a0ccb98 100644
--- a/apps/openmw/mwworld/worldimp.hpp
+++ b/apps/openmw/mwworld/worldimp.hpp
@@ -329,7 +329,7 @@ namespace MWWorld
 
         void setMoonColour(bool red) override;
 
-        void modRegion(const ESM::RefId& regionid, const std::vector<char>& chances) override;
+        void modRegion(const ESM::RefId& regionid, const std::vector<uint8_t>& chances) override;
 
         void changeToInteriorCell(const std::string_view cellName, const ESM::Position& position, bool adjustPlayerPos,
             bool changeEvent = true) override;
diff --git a/components/esm3/loadregn.cpp b/components/esm3/loadregn.cpp
index 3411d49a7c..5148a446c2 100644
--- a/components/esm3/loadregn.cpp
+++ b/components/esm3/loadregn.cpp
@@ -27,15 +27,14 @@ namespace ESM
                 {
                     esm.getSubHeader();
                     // Cold weather not included before 1.3
-                    if (esm.getSubSize() == sizeof(mData))
+                    if (esm.getSubSize() == mData.mProbabilities.size())
                     {
-                        esm.getTSized<10>(mData);
+                        esm.getT(mData.mProbabilities);
                     }
-                    else if (esm.getSubSize() == sizeof(mData) - 2)
+                    else if (esm.getSubSize() == mData.mProbabilities.size() - 2)
                     {
-                        mData.mSnow = 0;
-                        mData.mBlizzard = 0;
-                        esm.getExact(&mData, sizeof(mData) - 2);
+                        mData.mProbabilities.fill(0);
+                        esm.getExact(&mData.mProbabilities, esm.getSubSize());
                     }
                     else
                     {
@@ -85,9 +84,9 @@ namespace ESM
         esm.writeHNOCString("FNAM", mName);
 
         if (esm.getVersion() == VER_12)
-            esm.writeHNT("WEAT", mData, sizeof(mData) - 2);
+            esm.writeHNT("WEAT", mData.mProbabilities, mData.mProbabilities.size() - 2);
         else
-            esm.writeHNT("WEAT", mData);
+            esm.writeHNT("WEAT", mData.mProbabilities);
 
         esm.writeHNOCRefId("BNAM", mSleepList);
 
@@ -104,8 +103,7 @@ namespace ESM
     void Region::blank()
     {
         mRecordFlags = 0;
-        mData.mClear = mData.mCloudy = mData.mFoggy = mData.mOvercast = mData.mRain = mData.mThunder = mData.mAsh
-            = mData.mBlight = mData.mSnow = mData.mBlizzard = 0;
+        mData.mProbabilities.fill(0);
 
         mMapColor = 0;
 
diff --git a/components/esm3/loadregn.hpp b/components/esm3/loadregn.hpp
index 00c5546e2f..757566a360 100644
--- a/components/esm3/loadregn.hpp
+++ b/components/esm3/loadregn.hpp
@@ -1,6 +1,7 @@
 #ifndef OPENMW_ESM_REGN_H
 #define OPENMW_ESM_REGN_H
 
+#include <array>
 #include <string>
 #include <vector>
 
@@ -24,26 +25,24 @@ namespace ESM
         /// Return a string descriptor for this record type. Currently used for debugging / error logs only.
         static std::string_view getRecordType() { return "Region"; }
 
-#pragma pack(push)
-#pragma pack(1)
         struct WEATstruct
         {
             // These are probabilities that add up to 100
-            unsigned char mClear, mCloudy, mFoggy, mOvercast, mRain, mThunder, mAsh, mBlight, mSnow, mBlizzard;
+            // Clear, Cloudy, Foggy, Overcast, Rain, Thunder, Ash, Blight, Snow, Blizzard
+            std::array<uint8_t, 10> mProbabilities;
         }; // 10 bytes
-#pragma pack(pop)
 
         // Reference to a sound that is played randomly in this region
         struct SoundRef
         {
             ESM::RefId mSound;
-            unsigned char mChance;
+            uint8_t mChance;
         };
 
         WEATstruct mData;
-        int mMapColor; // RGBA
+        int32_t mMapColor; // RGBA
 
-        unsigned int mRecordFlags;
+        uint32_t mRecordFlags;
         // sleepList refers to a leveled list of creatures you can meet if
         // you sleep outside in this region.
         RefId mId, mSleepList;
diff --git a/components/esm3/weatherstate.cpp b/components/esm3/weatherstate.cpp
index 4c6896d37e..a7a10fe624 100644
--- a/components/esm3/weatherstate.cpp
+++ b/components/esm3/weatherstate.cpp
@@ -41,7 +41,7 @@ namespace ESM
             esm.getHNT(region.mWeather, regionWeatherRecord);
             while (esm.isNextSub(regionChanceRecord))
             {
-                char chance;
+                uint8_t chance;
                 esm.getHT(chance);
                 region.mChances.push_back(chance);
             }
@@ -66,9 +66,9 @@ namespace ESM
         {
             esm.writeHNCRefId(regionNameRecord, it->first);
             esm.writeHNT(regionWeatherRecord, it->second.mWeather);
-            for (size_t i = 0; i < it->second.mChances.size(); ++i)
+            for (const uint8_t& chance : it->second.mChances)
             {
-                esm.writeHNT(regionChanceRecord, it->second.mChances[i]);
+                esm.writeHNT(regionChanceRecord, chance);
             }
         }
     }
diff --git a/components/esm3/weatherstate.hpp b/components/esm3/weatherstate.hpp
index 3fad90ddb4..625ba0ba6e 100644
--- a/components/esm3/weatherstate.hpp
+++ b/components/esm3/weatherstate.hpp
@@ -13,8 +13,8 @@ namespace ESM
 
     struct RegionWeatherState
     {
-        int mWeather;
-        std::vector<char> mChances;
+        int32_t mWeather;
+        std::vector<uint8_t> mChances;
     };
 
     struct WeatherState
@@ -24,9 +24,9 @@ namespace ESM
         bool mFastForward;
         float mWeatherUpdateTime;
         float mTransitionFactor;
-        int mCurrentWeather;
-        int mNextWeather;
-        int mQueuedWeather;
+        int32_t mCurrentWeather;
+        int32_t mNextWeather;
+        int32_t mQueuedWeather;
         std::map<ESM::RefId, RegionWeatherState> mRegions;
 
         void load(ESMReader& esm);