After a decent scare last night, we have another citrus frost advisory tonight. It’s very unusual to get such advisories this time of year, after about March 15. The photo above is one of our remote temperature-monitoring stations. You can see a mercury thermometer, and a Kestrel mini-weather station set to record temperatures and other data every 30 minutes. It’s a home-made setup because we don’t have a weather station at this location (we have a Davis wireless weather station in another area). Temperatures in general are below average in the area, with a number of record lows around the state this morning. Our forecast tonight is for 37° F, but we have to subtract 5° to 7° from that to get the estimate for the grove. It’s going to be a long night.