What's your most to least favorable outdoor running conditions

1. hot hot heat. everything seems fine, and then i crumble and die and cannot come back. sweat so much i cannot drink enough. i can battle through other things (wear layers, be intentional with foot placement, bear whatever cold or rainy conditions exist)... but there is a point in the heat where my body just won't function properly and the suffering is higher than other conditions.

Probably 90° heat. It’s a lot worse if it’s really humid. We go to the upper panhandle of Florida on occasion and 90° there seems a lot worse than 90° in the upper Midwest or in Colorado. I just sweat like crazy and can’t keep hydrated. It’s weird, though, riding a bike in 90° doesn’t bother me as much even though I sweat as much.

It’s a tough choice

90° with humidity and no shade kills me.

Also have raced in 34° with rain and 20+mph winds.

If it were a race under these conditions I would DNS.

Don't be the person that looks at the weather report the night before to decide what you are going to do the next day.
What that means is don't be the person who sees if it is going to rain or snow or be too hot or cold and make your decision off of that forecast. Whatever Mother Nature puts in front of you, go out and attack it.
Trust me, if you are a true competitor in life and decide not to do something because of the elements, your decision will come back to haunt you later in the day.
Be a true competitor in life! It takes hours, even years, of training to feel just a few seconds of victory. Stay hard!

Sir, this is a Wendy's

0 Celsius is actually very enjoyable running conditions. As long as you are wrapped up and it's not super icy on the roads. I don't have any problems with these temps.
I'm from the UK so light rain is basically most runs too, no problem.

The worst is by far the 32C, it's totally nonrunnable temp here in the UK. Anything above 18 Celsius is causing problems with the humidity. Becomes hard to even do easy runs.

1 inch of snow and 20mph wind aren't necessarily bad either. If this happens I just do my sessions on the treadmill and do easy/long runs as appropriate to the conditions.

I'm going off the choice list: There's a chapter in Again to Carthage called Feedrock Trail or something like that. He describes a "perfect" run on an autumn day. He ends with a line something like: ... you can still have days like these ...

Worst conditions in which I've ever tried to run would be temperature just above freezing, with heavy sleet and strong winds. It's impossible not to get chilled under these conditions. I'd much rather have well below freezing with snow, because then it's easy to stay dry.

Anything over about 90 degrees F, with bright sun, is also just about impossible if I'm trying to put out any effort.

Easily hot and humid. A little cold and/or windy, oh well. I'll just put on a jacket and carry on. A dry heat, doesn't bother me much, I'll just have to drink a bit more fluids. But with my experience growing up in the southeast, no matter what I did, it's still a suffer fest even on my easy runs. Like clockwork every summer my training suffered from July till September living in the south.

Most to least... 4. 5. 2. 3. 1.

There's nothing quite like a run in the forest with light rain. Same for a run with a little snow on the ground.

Ice on the trails. I hate it when it snows, then melts and then freezes again ...

1. 90 dgrees+ is by far the worst.

2. windy and cold, but mostly the wind.. it is just so terribly frustrating.

3. a very distant third is cold and dark of the winter, but mostly the dark. it gets dark so early in the evening that it makes it very difficult to get in a run without a headlamp. the cold makes it worse, but honestly, the cold doesnt bother me much. after the first mile you are usually pretty warm.

Really everything else isn't bad.

Everything is better than this. And I hate the heat. There was a thread yesterday about your longest run on the TM. And if there's one thing I wish I could still tolerate about the TM is a longer run inside when it's icy like this. Both are bad options, but unfortunately I'm at the point where I'd rather risk falling than going inside. Which I know is dumb, but it is what it is.

As always, letsrun is full of haters. But remember kids....
Haters Can Be Your Ultimate Fuel Source!
Unlike when you are exercising and you run out of glycogen, your body can start getting weak. In this world of jealous, insecure people that love to hate on you, there is a plethora of energy to dream on in times of need. Don’t let these people hurt you in any way, shape or form. The more you succeed, the more they will hate!
The best thing to do with them is file them away in order in your mental rolodex. Never let them know that they get to you- in other words- show no weakness!
There will be plenty of times in your life when you don’t want to work out, study, work late, carry the boats, etc., and that is when you can go to this mental rolodex and pull out one of the random haters and use them for fuel.
Your haters will always love when you fail, quit, don’t rise to the occasion, etc. These ****ers are looking for that precise moment when you f*** up!
Make them hate you more by never giving them the satisfaction! Some of these mother****ers belong on speed dial! The world has a ton of energy sources around us. Whether it be the naysayers, people who bullied you, society at large, etc. Whatever it may be, make sure you use them all as energy sources.
**** that bull**** about kill them with kindness, torture those mother****ers with success! Stay hard as woodpecker lips!

BLACK ICE.

I lived in SE Asia for 35+ years so for me 0C is a killer. Add in winds at that temperature and it's a no go. 32C is not much of a problem nor is light rain at that temperature. I haven't ran in snow since my college days.

Maybe I am in the minority here, but I don't mind a 20 to 30 F degree day. I know that I'll be bundled up the entire time, and usually feel warm enough with hat and gloves after a mile.

The in-between days like 30 to 50 F, I find myself either too hot or too cold.

For racing, I will always say anything over 80° + humidity. Next, I would have previously said between 32°-40° with wind and rain/freezing rain. However, in April I ran a marathon PR at 33° with pouring freezing rain/sleet and 20-30 mph cross winds. My hands and arms went completely numb, but it's just easier for me to run faster in that weather than in the heat and humidity. I will not train in freezing rain, however.

I like all weather except cold rain and ice. I get up early so in the summer I run at 5 am. As for the cold, historically my highest volume month has been December, cross country us over and nothing to do but put in the miles