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Incorrect outside temperature reading (way off!)

Barry

Active Member
Aug 9, 2013
1,857
1,446
Colorado
Yesterday I hit the ski slopes for the first time this season. Drove up to the mountains yesterday morning and the outside temp was 19 F when I arrived. I have a condo there with indoor, heated parking. Temp in the garage is about 60 F. When I returned to the car in the afternoon, the car temp still indicated 19F. I sat there for a minute with my foot on the brake to see if it would update, but it didn't. After exiting the garage, it started climbing and settled in the mid 30s, the current outdoor temp.

My home parking is not heated, but in an underground garage, so the temp stays relatively constant and is often very different from outdoors. I've never noticed the temp staying at the last outdoor reading when parked at home. Anyone else ever notice this?
 

jerry33

(S85-3/2/13 traded in) X LR: F2611##-3/27/20
Supporting Member
Mar 8, 2012
19,951
23,854
Texas
There are a variety of things that can affect the temperature reading. Getting it wet is one of them. More often mine reads higher when charging rather than lower.
 

jerry33

(S85-3/2/13 traded in) X LR: F2611##-3/27/20
Supporting Member
Mar 8, 2012
19,951
23,854
Texas
Was a dry, sunny day, and car was parked (not plugged in) for about 6 hours.
I suspect that has to do with sleep mode. I've never noticed much of a difference when parked, not plugged in, at work. Then again, I haven't really been looking. I look in the morning to determine if I need to pre-heat or not.
 

Thumper

Active Member
May 6, 2011
1,092
4,318
Portland, OR
Probably unrelated, but a few mornings ago the speedometer was stuck on 19 mph for about two blocks before it corrected itself and has not repeated the behavior. I'v had the car almost 3 years and it has never done it before. Maybe 19 is a number the computer likes.
 

Ubbe

Member
Oct 16, 2013
98
63
Gothenburg, Sweden
Are you sure about the units? 19 degrees Celsius just about 60 degrees Fahrenheit (or 66.2), so did the settings for temp units switch over or did you perhaps see a conversion bug?
 

RiverBrick

Active Member
Mar 23, 2014
2,526
1,741
Mount Washington Valley
This is very noticeable when I park in a heated garage during the Winter. No exterior temperature update while the car is stationary. A lot of ICE cars are designed this way, because when there's no air-flow the thermometer will be influenced by waste heat from the engine.

I don't think the reset occurs until you drive over a certain speed for a certain time. So, similar to the behavior of the TPMS, except the threshold is lower since I have seen the temp updated while driving slowly towards the garage exit.
 

Barry

Active Member
Aug 9, 2013
1,857
1,446
Colorado
Are you sure about the units? 19 degrees Celsius just about 60 degrees Fahrenheit (or 66.2), so did the settings for temp units switch over or did you perhaps see a conversion bug?
Yes, I'm sure. Once I got moving and was outside, the temp rose to about 35 and the snow wasn't melting :smile:
 

Discoducky

P100DL, 2021 M3, 4 CT reservations and counting
Supporting Member
Dec 25, 2011
3,699
6,129
My mountain
I wonder where the temp sensor(s) are located? Maybe had snow/ice on it or was being cooled by snow/ice?

I park in a heated/insulated car and have not seen that behavior...ever...as my garage is nearly a constant 55 degrees and the outside is much colder in the morning.
 

Barry

Active Member
Aug 9, 2013
1,857
1,446
Colorado
Great question, Pan! Skiing was very good until about noon. After that, it got slick and crowded. There was one run open from top to bottom (at Keystone), and as you probably know, several of the big resorts aren't open yet. Should be much better the end of this week - more snow on the way and Breck is now open.

It was one of those "only in Colorado" moments - skied on Friday and bicycled in shorts on Saturday.
 

Barry

Active Member
Aug 9, 2013
1,857
1,446
Colorado
Follow-up for Pan:

Went back up to Keystone today. Outstanding conditions. Not surprising, given about 24" of snow over the last 3 days. Even though it was blue sky and sunny when I left Denver this morning, it was snowing at a good clip at the tunnel. The downhill side was messy, but no problems, other than worrying about the loonies flying by at 70 mph.

I lucked out and happened across a trail that ski patrol was just opening for the first time this season (they were opening and closing runs throughout the day.) Got some knee-deep powder! Went back to that same spot next run and all the powder was flattened. Apparently, I wasn't the only one on it :smile:
 

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