5 thermometers all tell a different temperature here

I have 5 thermometers in various places in my little second-story
square house which has windows in all four directions. They tend to
give different readings from each other.

Today's temperatures at about quarter of 3 pm.

#1 (outside, North) - 77
#2 (inside, East) - ~76 (hard to read)
#3 (outside, West)- 97 (in hot sun today), inside - 75
#4 (inside, South) - 87
#5 (outside, South) - 104! (in hot sun today)
#6 (inside wall by bathroom) - 75

Somehow I think it isn't 104 degrees outside today. Nor 97. More like
in the 70s (mid 70s in the shade?, hotter in the sun.)

Will try to add some more disparities as it gets warmer.

About the thermometers

#1
Where - On stereo cabinet. near Eastern window/northern side of the house.
Make/model # - Taylor 5381
Type - digital, battery operated
Indoor/outdoor? - Indoor/outdoor
Wireless/wire/one piece - wire for outside temp goes to outside of front door
Accurate? - I trust the readings on this one.
Handicap - It is on the shady side (North) of the house so will give
cooler readings in both the summer and winter.

#2
Where - inside room by comfortable chair near Eastern window/Northern
side of house.
Make/model # - "accurate" (different brand than #5)
Type - mercury
Indoor/outdoor? - Indoor
Wireless/wire/one piece - one piece
Accurate? - Well, the mercury container came loose in the holder. I
readjusted it but it may not be quite right. I consider readings from
it to be approximate.
Handicap - See above

#3
Where - On bedside table. Outdoor sensor is in mailbox that is on the
West side of the house.
Make/model # - Sharper Image OQ234
Type - digital, battery operated
Indoor/outdoor? - indoor/outdoor
Wireless/wire/one piece - wireless
Accurate? - The outdoor sensor is in a mailbox that faces the West.
It gets hot in the summer so I bet it won't be accurate. I haven't
had it long enough to really know. The indoor reading is trustworthy.
Handicap - Sensor in the mailbox gets direct sun.

Also, the outdoor reading sometimes appears blank. It is receiving a
signal but it doesn't display the temperature sometimes.

It has memory so I can tell how hot and cold it has been since the
last time I changed the battery. (~ 2 or three months)

#4
Where - On the kitchen table near windows that open to the South.
Gets direct sunlight
Make/model # - Atomic Time RCL-19 (radio controlled AM/FM clock radio)
Type - digital, runs on house power
Indoor/outdoor? - indoor
Accurate? - It gets direct sunlight. In the summer it gets hot.
Winter is probably more accurate.
Handicap - Sitting in the hot sun in the summer I doubt it is
accurate of the room temperature but it may be close.

#5
Where - On the kitchen table near windows that open to the South.
Get's direct sunlight.
Make/model # - "Accurate" (different brand then #2)
Type - digital, battery operated
Indoor/outdoor? - indoor/outdoor but I only care about the outdoor reading.
Wireless/wire/one piece - wire to outdoor sensor
Accurate? - Since it is in the sun it tends to show higher than air
temperature. The outdoor sensor even though I covered it with a
makeshift cover, tends to show higher than real temperatures.
Handicap - Indoor temperature is read from clock radio that sits on
kitchen table. Outdoor sensor even though shaded, gets hot.

#6
Thermostat
where - on wall by bathroom. Shaded all day.

#7
Where - in car
type - mercury