SGP/THWAPS/B4 - Temp and RH values incorrect during hours of no sunlight

Unknown issues caused the temp and RH values to become lower during non-sunlight hours.  
The affects are best seen at sunrise and sunset when the data would adjust upward or 
downward abruptly.  Plots of the standard deviation show abrupt spikes at these times.  
Comparison plots to nearby mesonet sites suggest the nighttime values of both temp and RH are 
lower than nearby sites.  This problem was also very intermittent and was not occurring on 
a daily basis.  A complete move of the sensors and collection system to a separate 
building repaired the problem.

• Standard Deviation of Pressure(sd_pres)
• Standard Deviation of Air Temperature(sd_temp)
• Beam 0 Temperature(temp)
• Relative humidity inside the instrument enclosure(rh)
• Standard Deviation of Vapor Pressure(sd_vap_pres)
• Vapor Pressure (kiloPascals)(vap_pres)
• Standard Deviation of Relative Humidity(sd_rh)