Question: When was the record high temperature in Yellowstone National Park?
About the article "Yellowstone National Park", section "Climate".

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Grand Teton National Park has a semi-arid climate with the wettest months between November and January, mostly in the form of snow.
The park averages of snow in the mountains and in the valley annually.
In January, the daily temperature range averages between during the day to at night.
During the month of July, the daily temperature range is and .
The record high is and the record low is .
Temperatures above the valley in the mountains during the summer average 1 degree cooler for every of altitude gained, so high altitude passes may remain snow covered until mid-July.
Thunderstorms are common during the summer, especially over the mountains; by contrast, no tornados have ever been reported within the park.
The F4 Teton-Yellowstone tornado was a high altitude tornado which touched down northeast of the park on the border of the Teton Wilderness of Bridger-Teton National Forest and Yellowstone National Park. 
Yellowstone climate is greatly influenced by altitude, with lower elevations generally found to be warmer year round.
The record high temperature was in 2002, while the coldest temperature recorded is in 1933.
During the summer months of June through early September, daytime highs are normally in the range, while nighttime lows can go to below freezing (0 °C)—especially at higher altitudes.
Summer afternoons are frequently accompanied by thunderstorms.
Spring and fall temperatures range between with cold nights in the teens to single digits (−5 to −20 °C).
Winter in Yellowstone is very cold with high temperatures usually between zero to 20 °F (−20 to −5 °C) and nighttime temperatures below zero °F (−20 °C) for most of the winter.
Precipitation in Yellowstone is highly variable and ranges from annually near Mammoth Hot Springs, to in the southwestern sections of the park.
The precipitation of Yellowstone is greatly influenced by the moisture channel formed by the Snake River Plain to the west that was, in turn, formed by Yellowstone itself.
Snow is possible in any month of the year, with averages of annually around Yellowstone Lake, to twice that amount at higher elevations.
Tornadoes in Yellowstone are rare; however, on July 21, 1987, the most powerful tornado recorded in Wyoming touched down in the Teton Wilderness of Bridger-Teton National Forest and hit Yellowstone National Park.
Called the Teton–Yellowstone tornado, it was classified as an F4, with wind speeds estimated at between .
The tornado left a path of destruction wide, and long, and leveled of mature pine forest.
Both high elevation areas are classified as humid continental (Dfb), according to Köppen-Geiger climate classification.
Big Alcove Spring is a hot spring in Norris Geyser Basin, Yellowstone National Park in the United States.
In 1996 the water temperature was . 
Hayden Valley is a large, sub-alpine valley in Yellowstone National Park straddling the Yellowstone River between Yellowstone Falls and Yellowstone Lake.
The valley floor along the river is an ancient lake bed from a time when Yellowstone Lake was much larger.
The valley is well known as one of the best locations to view wildlife in Yellowstone. 
Turquoise Pool is a hot spring in the Midway Geyser Basin of Yellowstone National Park, Wyoming.
Turquoise Pool has a temperature between and was named by members of the Hayden Expedition of 1878.