On first testing of your DHT11 Arduino everything appears to work fine. However, I noticed after a few minutes that none of the readings were changing which surprises me. One would think the numbers would be jumping all around, instead I only see (repeated):
Read sensor: OK
Humidity (%): 37.000000000
Temperature (F): 69.8000030517
Its almost like the readings were taken once and never updated.
Now, if you grab ahold of the sensor, the temperature will go up, stabilize, but then stick there forever.
I didn’t see a reset for the sensor, but maybe it’s waiting for one before taking a new sample?