This is a Three-Season Tent, which is strong enough to handle rain in spring, summer, or fall. For high winds, Eureka recommends a 4-season tent. However, they do recommended using guylines to help stay put.

When high winds or a storm are predicted, do not count on staking alone to keep your tent secure. Depending on the model, your tent fly has built-in loops or rings at optimal guyout locations. It is important to put in the extra time guying out your tent. Correctly done, it can save your tent during harsh weather.
1. Attach parachute cord to the loops/rings and stake them in the ground three or four feet from the edge of the tent. If staked too close to the tent, wind can cause an upward pull that could dislodge the stakes.
2. Make sure that the top fly is securely attached to the framework underneath. Ties hook and loop closures, or dog-bones and elastic loops are typical fasteners sewn to the underside of the fly for this purpose.
If your tent does not have loops or rings for guyouts, attach guylines 1/3 or 1/2 of the way up the framework on the main sidewalls. This enables the guyline to support the lower section of the pole, while the upper pole can flex the side of the guyout. This will prevent all movement except toward the anchor. The idea is to get the guylines to work together through opposition.

Yes, the windows will zip up all the way. If you zoom in on the photo you will be able to see the zippers. However, the windows are mesh. Which you can see thru.

Pack size is 4" x 17.5".