As I explore I learn things, and today I learned my humidity reading is quite lower than the SFO airport station 4 miles away. I seem to be about 10% humidity value below what they state… as in, it’s raining both places, they show 100%, I show 89%… They show 90%, I show 79%. Is the humidy picked up from the outside sensors or from the in-house sensors? I suppose it’s not 100% in the house, but to give me something to ruminate on tonight whle I’m at work, I chose humidity…
Can anyone shed some light?
Hi,
It’s the outside humidity. If the 2310 is like the 2315 the humidity range is 19% to 96%, top end is not too bad, but lower humidity in cold weather really messes up the dew point temperature.
there is an offset adjustment for humidity
Go to - Setup> Control panel> Barometer offset other offsets>
in the upper right is “Humidity offset (%)”
the check boxes can also force a 100% reading at the lower 96% limit
the slope factor can help also - I’m currently running at -3. Use the view result to see how this effects the reading.
Keep comparing your humidity reading to a known good reading and keep adjusting.
It can depend on how the sensor is housed as well.
I have not got a WS2310, but I used to have a homemade shield that didn’t do too well on hot sunny days as the temp read too high but the humidity did get to 98% (max for my station) on wet days.
Since I put the sensor in a proper radiation shield (not fan assisted) the temperatures have been more accurate but my humidity has never read above 90% on the station.
I need to relocate the shield and sensors eventually I think but for now I have had to add an offset in WD to increase the value a bit so that wet days are in the mid 90s but this means that lower readings are also affected.
I guess I am not worried about the exact value. As long as I can tell that when the humidity increases sharply it is likely to rain even if I don’t see a very high value.
I am running the WS-2310 and to the best of my knowledge your base station/console, has it’s own built in temp and humidity sensor while your outside thermo-hygro transmitter has the outside temp and humidity sensors within it…
I know my indoor and outdoor humidity readings are miles apart LOL
Active rain does not necessarily indicate 100% humidity at your sensor location, it does indicate 100% humidity at the origin of the rain… way ^ way up there…
humidity measures moisture in the air. But it can be raining without 100 percent humidity. And, the humidity can measure 100 percent without it raining.
For clouds to form and rain to start, the air does have to reach 100% relative humidity, but only where the clouds are forming or where the rain is coming from.
If it’s raining the humidity doesn’t necessarily have to be 100%. The air would be saturated where the rain is forming but may not be at ground level. If you are in fog the humidity should (in theory) be 100%.
The most recent versions of the WS23xx stations claim to have a humidity range of 1-99%. I have been logging my data to a database for the last few months and haven’t seen any figures below 18% or above 90%. It is the middle of summer here so that may be why the humidity hasn’t got higher than 90%, but I am beginning to suspect that this is the limit for these stations. I have also read somewhere on here that these ‘cheaper’ stations are less accurate at the extreme ends of the scale.
