A dirty windshield causes eye fatigue and can pose a safety hazard. Replace worn blades and get plenty of windshield washer solvent. Don't forget your spare, and be sure the jack is in good condition. An alignment is warranted if there's uneven tread wear or if your vehicle pulls to one side. Minor brake problems should be corrected promptly.
Batteries can fail any time of year.
The only accurate way to detect a weak battery is with professional equipment. Avoid contact with corrosive deposits and battery acid. Wear eye protection and rubber gloves. To prevent scratching, never use a dry rag. Also include a first aid kit, flares, and a flashlight.