Climate and monthly weather forecastDenali National Park and Preserve, AK

The climate of Denali National Park and Preserve

Situated in the northern part of the Alaska Range, Denali National Park and Preserve is classified under the Köppen climate classification as ET, indicating a Tundra climate. Tundra climates are characterized by long, extremely cold winters and short, cool to mild summers.

Typically, yearly weather highlights include long, bitterly cold winters with consistent snowfall, and brief, temperate summers with some precipitation. Average high temperatures cover a range from 5°F (-15°C) in the depth of winter to a peak of 57°F (13.9°C) in the height of summer. This stark contrast underlines the harshness of the climate.

Low temperatures, however, provide a stark visual of the extremity of this cold environment, plummeting to an average low of -13°F (-25°C) in the coldest month, and only rising to 39°F (3.9°C) in the warmest. Within the variable rainfall throughout the year, July averages the highest rainfall of 3" (76mm) while April and May see the lowest at 0.7" (18mm) each.

Daylight hours also exhibit a notable shift throughout the year, reflecting the park's position close to the Arctic circle. The shortest daylight period is in December with only 4.9 hours, while at the height of summer in June, the park enjoys 20.2 sunshine hours. Aligned with this, June also heralds the highest UV index at 5, contrasting with 0 recorded in the depths of winter.

The best time to visit Denali National Park and Preserve

To experience the most favorable conditions in Denali National Park and Preserve, the period from late May to early September offers the most temperate weather. Average high temperatures range from 43°F (6.1°C) to 57°F (13.9°C), vastly more comfortable than the exhausting chill of winter. Despite this, visitors should come prepared for some rainfall as August is typically the wettest month, averaging 2.9" (74mm) across 16 days.

With daylight hours ranging from 15 hours in early May and 12.9 hours in late September, this period offers ample opportunity for outdoor activities such as hiking, sightseeing, and photography.

The worst time to visit Denali National Park and Preserve

The harshness of the Alaskan winter makes the period from November to March the least favorable for visiting Denali National Park and Preserve. Average high temperatures range from 5°F (-15°C) to 16°F (-8.9°C), and can sink as low as -13°F (-25°C) to -9°F (-22.8°C), creating intense cold conditions that may be challenging for many visitors. Travellers are further deterred by the presence of snow and the sparse daylight hours, reaching a low of only 4.9 hours in December.

Spring weather in Denali National Park and Preserve

Spring in Denali National Park and Preserve spans from March to May. During this time of thawing snow and gradually lengthening days, average high temperatures rise from 16°F (-8.9°C) to 43°F (6.1°C). Meanwhile, average lows warm up from -4°F (-20°C) to 23°F (-5°C). Rainfall remains consistently low at this time, with April and May averaging a minimal 0.7" (18mm) across 8 to 10 days respectively.

Summer weather in Denali National Park and Preserve

The arrival of summer in Denali Park is signaled by long, glorious days, and a peak in both temperature and UV index. From June to August, average highs range between 54°F (12.2°C) and 57°F (13.9°C) with lows between 34°F (1.1°C) and 39°F (3.9°C). Rainfall is generally higher during this season with amounts peaking at 3" (76mm) in July spread across 16 days. Daylight, however, is a summer triumph, with an astounding 20.2 hours of sunshine in June, falling to 16.1 hours in August.

Autumn weather in Denali National Park and Preserve

Autumn, from September to November, sees temperatures and daylight hours drop drastically. Average high temperatures shift from 43°F (6.1°C) to 10°F (-12.2°C), and lows descend from 27°F (-2.8°C) to -6°F (-21.1°C). September experiences the most rainfall in this season with 1.8" (46mm) over 15 days. Alongside this, daylight also decreases, going from 12.9 hours in September to 6.8 hours in November.

Winter weather in Denali National Park and Preserve

True to its Tundra classification, winter in Denali National Park and Preserve is a harsh affair. From December to February, visitors can expect to face average high temperatures in the single digits, between 5°F (-15°C) and 9°F (-12.8°C), and average lows hitting a teeth-chattering -13°F (-25°C) in January. Rainfall during these months is relatively low, at 0.9" (23mm) each in December and February. Daylight is also at its most scarce with December experiencing the least sunlight, at just 4.9 hours per day.

Weather in January

January's weather in Denali National Park and Preserve shows the true strength of Alaskan winters. There is a noticeable difference between high temperatures, which average 5°F (-15°C), and low temperatures, which can plummet to -13°F (-25°C). Weather in January »

Weather in February

February's weather patterns show a slight shift toward favor as temperatures inch higher. A leap from January's icy lows to this month’s -9°F (-22.8°C) signals the gradual retreat of the intense cold. The increase in daylight hours to 8.8, nearly 3 more than January, offers more opportunities for outdoor activities. Weather in February »

Weather in March

In March, Denali National Park and Preserve experiences some of the first signs of spring. Gradually warmer days rise to 16°F (-8.9°C), up from February’s 9°F (-12.8°C). The sunlight that touches the park starts to lengthen, boosting the daily sunshine hours to 6. Weather in March »

Weather in April

April brings undeniable signs of spring with warmer temperatures and longer daylight hours. Days get significantly longer with an increase in daylight to 15 hours. There is an observable shift in the quantity of rainfall which drops to 0.7" (18mm), the second lowest after January. Weather in April »

Weather in May

As the calendar turns to May, Mother Nature paints a clearer image of spring in Denali National Park and Preserve. As the daily sunshine hours stretch to 9 hours, it results in a significant jump in the UV index up to 4. The park gets more exposure to the sun, moderating the ambient temperature. Weather in May »

Weather in June

June marks the arrival of summer in Denali National Park and Preserve. The most striking features of this month's weather is an impressive 20.2 daylight hours, illuminating the park for almost the entire day. High temperatures reach their apex, soaring to 54°F (12.2°C), making it the hottest month of the year. Weather in June »

Weather in July

In July, Denali National Park and Preserve endures the peak of the Alaskan summer. With the highest rainfall of 3" (76mm), this month is the wettest period of the year. The park basks in the glory of 19 average daily daylight hours, the second-highest after June. Weather in July »

Weather in August

As August rolls in, weather patterns in Denali National Park and Preserve begin their transition back towards cooler temperatures. Although the remnants of summer weather can still be felt with high temperatures lingering at 54°F (12.2°C), the arrival of August is a telltale sign of oncoming autumn. Weather in August »

Weather in September

September represents the shift to fall in Denali National Park and Preserve with a significant change in weather dynamics. A particular characteristic of September is the retreat of daylight hours to 12.9 from August’s high of 16.1. Weather in September »

Weather in October

By October, the fall season has a firm grip in Denali National Park and Preserve. An evident departure from warmer months, October exhibits cooler temperatures and shrinking daylight hours. The decrease in sunlight, from around 15 hours in summer to just under 10, is a clear indicator of the seasonal transition. Weather in October »

Weather in November

In November, the weather in Denali National Park and Preserve takes a polar turn. A drastic dip in high temperatures from 25°F (-3.9°C) in October to 10°F (-12.2°C) in November is evident as winter approaches. The shortening daylight hours, falling to 6.8, further reinforce the onset of Alaskan winter. Weather in November »

Weather in December

December ushers in winter with its frigid climax in Denali National Park and Preserve. Matching the lowest UV index of the year with January, December also experiences the least amount of daylight, offering just 4.9 hours. While the temperatures continue to plummet, there is a minute increase in rainfall from the previous month. Weather in December »