Here in central Texas, water typically is the highest priority during late spring through summer. It does get pretty chilly with severe thunderstorms and high winds over the cooler/transitional months, so shelter and appropriate clothing is edging near the top of the list. Need for fire isn't an issue unless it's really cold and it truly is a survival situation...there are burn bans all over down here most of the time and all through summer
I've lived in all but the northeast of the continental US, but I've also spent some time in South America, Korea and the Middle East. Every location, elevation and season will adjust your top priorities a little...but your "essentials" will still remain. There is a "ridge to river" relay race in Wenatchee, Washington...you start out in the mountains in the upper 20 to lower 30 degrees for cross country skiing, transition to a bike and then foot race and finally to a kayak race in the Columbia river where the temperatures are in the upper 80's to lower 90's (Fahrenheit). All this is done in a 4-6 hour period...quite a shift in temps and conditions!
I think clothing will remain a constant priority but I adjust according to the season; whether it's protection from the sun or protection from rain or snow or sleet or wind. You may have to add more bulk for insulation during the winter, but it's always a top priority for me. It may be wool or gore-tex in the winter, but I like the fast-drying synthetics for the summer.
Shelter is also in the same boat, but some seasons will dictate the necessity more than others. Water is always at the top, but in some places you just need a lot more!
I know you can go a while without food, but if it's extremely cold caloric intake is essential for your body to generate heat.
Insect repellant is nice to have at times and mandatory during some seasons at some locations.
Good topic as I think we all adjust our priorities slightly depending on the season and activities.
ROCK6