The table below gives the closing limits for the observatories. Observers should err on the side of caution. If you close because of humidity, wait for humidity to be at 80% or below for at least 30 minutes (or dew point offset greater than 5° C for at least 30 minutes. 

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SARA-CT Note: Recommendation is to not observe looking North if wind is from the north with a speed of 40 kph or greater (because of problems with dust).