Well, Uncle Mxy's link seems to have satisfied me. It seems he is invulnerable to all but magic --Dracula's teeth or a magic sword, for example. Still, I can imagine times when Thor's godforce is low or he is distracted --and maybe those teleportation tricks are draining? And doesn't he get alot of his power from Odin (or from humans believing in him)? Thor's clothes aren't invulnerable --he gets them torn up alot (but they should burn off as well).
1) INVULNERABILITY: The following are historical examples of incredibly devastating forces that has been used against Thor. Thor has survived each of these highly Lethal attacks, and most of the time have come out unscathed. A) Thor has been on the receiving end of Zeus and Blitziana's LIGHTNING bolts. B) Thor withstood a barrage of ARTILLARY fire with ease, and a Heat Seeking Missile- see Thor#480, and Thor-#247; C) and in the J. Kirby's days Thor used to test his invulnerability by having a Cobalt Bomb explode next to him. D) Kang’s Dissolution blast to the EXTREME did not fell Thor-Avengers-#143, and in Avengers-#295 Mechanosaurus struck Thor with a Megahertz Artillery fire that would easily destroy any vehicle to pieces- with no visible effect on Thor (Note: even bullets from a powerful sub-machine gun can’t hope to accomplish the same amount of penetration or destruction that could a Megahertz artillery attack by Mechnanosaurus). In Avengers-#5-pg 20- it explicitly stated that nothing, not even an ATOMIC BLAST could injure Thor, or his hammer. E) Thor resisted the full power of the Man from Saturn’s Graviton ray-Thor-#255. F) Thor withstood the Thermal Man's HEAT blast that could melt Tanks instantly, also, Thor was insensitive to the Lava Man's attack- see Avengers #5. In addition, Thor withstood a direct hit by Firelord’s Cosmic Flame with absolutely no dire visible effect on him- Thor-#306, and Ghost Rider’s Flame proved to be totally ineffectual against Thor, as well- Avengers-#214, and when the Planet Ego raised his internal heat temperature to the EXTREME, it had no affect on Thor-See Thor-#133. G) Thor was unaffected by an Alien Freeze Ray-Avengers-#14 (vol.1). H) In terms of indescribable sheer Magical, and Cosmic power, for instance, Thor was just temporarily stunned by Ego’s pulsating energy attack that would, physically, have rendered AN ENTIRE RACE UNCOUNSCIOUS- Thor-#133. In addition, Thor withstood blast by Odin-Thor-#241, by the Celestials-Thor-#300, and by a space Armada-Avengers-Annual#7. However, the three most impressive testimony events that showed Thor's invulnerability, however, was when he, almost, took a direct hit by a Doomsday Bomb that was capable of destroying an entire planet, and soon after that explosion Thor felt from space to a planet called Pangoria-see Thor#387. Also, Thor resisted the weight of Multitude of Planets-Thor Annual-#9, and the Gravity of a Neutron Star-Thor-#282. The other event took place when Thor paid an uninvited visit to ATUM in the Sun's core. If you think that this wasn’t enough, Thor has survive incredible physical punishment by the likes of the Destroyer, Durok, the Mangog, Surtur- Thor-#351, by the Devourer-Marvel Two In One-#23, The Thermal Man, Terminus, the 300,000 ft. tall Rhun god when he swatted Thor aside-Thor#220, and the Celestial- The One Above All- when he not only swatted Thor aside, but did hurled at him unnumbered tons of delicate machinery at him with no significant adverse effect on Thor-See Thor-#288.