diff --git a/metobsapi/data_api.py b/metobsapi/data_api.py
index e82763d8d9551966efabd3613cc389995fb34484..49e682a15b1d2b818c960ac539c8d262f14478ea 100644
--- a/metobsapi/data_api.py
+++ b/metobsapi/data_api.py
@@ -16,6 +16,7 @@ LOG = logging.getLogger(__name__)
 ROUNDING = {
     'aoss.tower.rel_hum': 0,
     'aoss.tower.wind_direction': 0,
+    'aoss.tower.accum_precip': 2,
     'mendota.buoy.rel_hum': 0,
     'mendota.buoy.wind_direction': 0,
     'mendota.buoy.chlorophyll_ysi': 2,