The important thing to realize when you plan your fishing trip to the Yellowstone area is that we are in the mountains. Weather here can change on a dime. Most years, temperatures will change fifty degrees Fahrenheit in the space of a day or two at least once, and not always in fall and spring.
The bottom line is that you want to come prepared for dry or wet weather any time during the summer (late June through Labor Day), with average temperatures ranging from the 40s to the 80s and possible temperatures from the 20s to the 100s. In the spring (early April to mid June) and fall (mid-September until November 1) you should be prepared for temperatures from the high teens to the 80s. In the winter (early November-early April), highs range from 0-30 degrees in January to 25-50 in early November and late March. Lows are frequently below zero (down to -30 at times) from mid-November through early March.
The following table has some clothes you want to be sure to bring, in addition to your daily wear clothes.
|breathable raincoat||hiking boots||lightweight angling shirts|
|fleece jacket||hiking socks||" " pants|
|breathable waders||felt or Aquastealth-soled wading boots. Note: spikes cannot be used in drift boats.||sandals or light shoes for the end of the day|
|heavy shirt||neoprene fingerless gloves every month except July||broad-brimmed or baseball hat|
|heavy pants||heavy gloves or mittens from September 15-May 15||large handkerchief or BUFF for facial covering if you're sun-sensitive|
|capilene thermals for every month except July||knit or fleece hat||neoprene booties for wet wading (we usually wet wade late June to mid-September)|
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