Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP)
Flight Crew Total 5
Fatigue; Situational Awareness; Workload
No Specific Anomaly Occurred All Types
General Work Refused
Company Policy; Weather; Procedure; Human Factors
On the last day of our scheduled sequence of trips we were to fly first from Arizona to Illinois; followed by a Texas turn. During our initial flight planning; we learned weather would be an issue for our arrival in Illinois and planned accordingly. We ended up being rerouted a few times to avoid weather; and were further delayed as the airport was being reconfigured during our arrival.As we attempted our first approach; at about 2;000 AFE we experienced windshear as we were on glide slope; trying to configure for final flaps with thrust levers at idle yet airspeed increasing. We were not yet in a demanding situation; but felt it prudent to go-around rather than create an unsafe situation by pressing on. We were vectored around for a second attempt; anticipated the airspeed gain at altitude and were able to complete the approach and landing safely.With weather surrounding the area; the ramp had been closed and the airfield was congested with aircraft waiting to be parked. We were sent to the 14R holding pad to wait for our gate. We waited for about an hour before our gate was finally available; and then had quite the long taxi; due to congestion; to get to the gate. The flight was originally scheduled for XA:15PM but turned out to be XC:16PM.After arrival; the Captain and I discussed the fatigue issues associated with the flight we just completed; the anticipated delays both in Illinois and Texas; our extremely late arrival time back in Illinois; and the anticipated weather issues predictable on both of the remaining legs. With all these factors plus the fact we were already getting tired and that it definitely would get worse; we felt compelled to call fatigued.There were no identifiable factors that could have prevented this fatigue call. It would have been an extremely taxing day without weather events and delays. Making that last day less demanding; completing only our second scheduled flight of the day; would likely have resulted in no fatigue call [from us].
After experiencing extensive weather delays on the first of three scheduled legs on the last day of an assignment; the flight crew of and air carrier aircraft refused to fly the last two legs due to incipient fatigue and predictable continuing delays on their last two legs.