The gauge on my 2002 Sedona settles just below the midpoint when it reaches normal operating temperature.

An interesting thing happened to my ride last month, after I brought it home from the casa for a clutch replacement. Every so often, especially on bumpy roads, the needle on the temperature gauge would suddenly dip, and then slowly rise again to its normal level. When I had it checked, it turns out the connection of the sensor to the engine was a bit loose. When the mechanic reconnected it, everything was back to normal (whew).