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The temp info is great. Thanks!
If you do use lawn weeds killers (most contain 2,4d) follow precautions and use when the temperatures are between 70 F & 90 F. Below 70 F they won't work well and above 90 F they can damage your lawn. I would recommend keeping all people and pets off for at least 24 hours. http://gardeninspire.webs.com/pesticidesher...
Vinegar users also need to be careful. Just because it is natural doesn't mean it can't hurt you if you have sensitive skin. Do not use more than 5% acidity (normal household stuff). Vinegar is broad spectrum which means it kills whatever it comes in contact with, including shrubs & grass. Vinegar only kills topically. Spray it on a leaf, especially in the sun, and it will burn the area it contacts. It will not spread to the roots or to other leaves and kill them, but sometimes the death of the leaf will lead to starvation of the rest of the weed; sometimes not.