You should have no issues with the
cold-climate fluid or the fluids John mentions. Being formulated for better cold-climate performance doesn't mean it's not going to work as well on 100-degree days.
Lee Manufacturing also sells their own fluid:
POWER STEERING FLUID
Lee power steering fluid and it's proprietary blend of additives is the oil of choice among many professional race teams. The increased lubrication quality of this non-synthetic fluid is just one of the reasons to use our oil.
Special anti foaming agents and high pressure co-molecules are blended to exact specifications for the best power steering oil period.
Bottled in a quart and gallon sizes, this power steering oil is tested tuff and has conquered the Baja 1000 time and time again, used in all arenas of racing, off road, monster truck, NASCAR, sprint car, modifies and high performance street vehicles, IT GETS THE JOB DONE.