From 7519df943473ed050301a65630381d205fda52f5 Mon Sep 17 00:00:00 2001
From: "Adam R. Jensen" <39184289+AdamRJensen@users.noreply.github.com>
Date: Fri, 5 Dec 2025 17:32:46 +0100
Subject: [PATCH] Add longwave_down to ERA5 variable map

---
 pvlib/iotools/era5.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pvlib/iotools/era5.py b/pvlib/iotools/era5.py
index 601800f904..b19096b5f6 100644
--- a/pvlib/iotools/era5.py
+++ b/pvlib/iotools/era5.py
@@ -12,6 +12,7 @@
     'sp': 'pressure',
     'ssrd': 'ghi',
     'tp': 'precipitation',
+    'strd': 'longwave_down',
 
     # long names
     '2m_dewpoint_temperature': 'temp_dew',
@@ -19,6 +20,7 @@
     'surface_pressure': 'pressure',
     'surface_solar_radiation_downwards': 'ghi',
     'total_precipitation': 'precipitation',
+    'surface_thermal_radiation_downwards': 'longwave_down',
 }