Sawtooth pattern in my temperature and dew point data.

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  • Updated 5 months ago

I have a new 5 in 1 weather station (Model # 01536) online
using the 09150 SmartHub. I'm seeing a sawtooth pattern in my temperature and dew point data especially in the morning hours starting after 9am usually. I've viewed a friends station (same outdoor unit) and do not see the sawtooth in his data. I'm wondering if the sun breaking through the clouds somehow is spinning up the aspirated fan intermittently and causing the sawtooth. Anyone experienced this ?

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Mark Mershon

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Posted 5 months ago

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AcuRite Jennifer

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Hello Mark,

Is it displaying the correct readings for the timeframes? How far is your station off the ground? What is it mounted on? Are you seeing the same type of pattern on My AcuRite as well?
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Mark Mershon

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I have to assume the readings are correct per timeframe. My station is approximately 12 feet off the ground attached to an out building. (see pic) I just pulled data from Acurite and it agrees with the sawtooth pattern on WU. I do know the proximity of my station to the building roof has been causing scatter in my wind direction data. I plan to move the station when the weather improves about 5 feet higher and away from my building roof. I expect the proximity to the building roof will cause inaccurate temperature data when warmer weather arrives.

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this is typical behavior when the sun is in and out of the clouds with this station.
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George D. Nincehelser

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Pay close attention to the vertical scale of the graph.  The auto-scaling can greatly exaggerate variations depending on the measured high and low so far for the day.

Also, the way you have your unit mounted is also going to cause temperature variation depending on wind shifts.  Even though the temps are in the 30's, it will still be warmer above those shingles, and you've got the temperature sensor aligned right on the edge of shingled/not shingled.
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AcuRite Rachell, Employee

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Hello Mark,
We would certainly recommend mounting your sensor at least 5 ft above the mounting surface. The sensor being so close to the roof will cause inaccuracies. Thank you.