It isn't only in hot areas. This is what is said about storing nitro and dynamite and that is under good conditions not the conditions that we will be leaving them in which is exposed to the elements and left for however long it takes for us to invade. We also have yet to develop the blasting caps.
The maximum
shelf life of nitroglycerin-based dynamite is recommended as one year from the date of manufacture under good storage conditions.
[6]
Over time, regardless of the sorbent used, sticks of dynamite will "weep" or "sweat" nitroglycerin, which can then pool in the bottom of the box or storage area. For that reason, explosive manuals recommend the repeated turning over of boxes of dynamite in storage. Crystals will form on the outside of the sticks causing them to be even more shock, friction, and temperature sensitive. This creates a very dangerous situation. While the risk of an explosion without the use of a
blasting cap is minimal for fresh dynamite, old dynamite is dangerous. Modern packaging helps eliminate this by placing the dynamite into sealed plastic bags, and using wax coated cardboard.
Dynamite is moderately sensitive to shock. Shock resistance tests are usually carried out with a drop-hammer: about 100 mg of explosive is placed on an anvil, upon which a weight of between 0.5 and 10 kg is dropped from different heights until detonation is achieved.
[8] With a hammer of 2 kg,
mercury fulminate detonates with a drop distance of 1 to 2 cm, nitroglycerin with 4 to 5 cm, dynamite with 15 to 30 cm, and ammoniacal explosives with 40 to 50 cm.
Edit: well that answers that we still need to invent the blasting cap to make it work though.