Climate and monthly weather forecast
Mount Lemmon, AZ

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Mount Lemmon Ski Valley from atop the Mount Lemmon, Arizona
Mount Lemmon Ski Valley from atop the Mount Lemmon, Arizona

The climate of Mount Lemmon

Situated in Arizona, USA, Mount Lemmon features a BSh - subtropical steppe, according to the Köppen Climate Classification. It reveals a dry, hot climate with mild winter months and moderate rainfall throughout the year.

Annual climatic fluctuation is significant with temperatures varying from a balmy 76.5°F (24.7°C) at their highest in July to a cool 21.8°F (-5.7°C) at their lowest in February. Rainfall also sees a varied pattern, with the wettest period set between July and September, when it receives 4.4in to 7in precipitation, and the driest months being April and May with rainfall barely reaching 0.3in to 0.5in.

Noteworthy are the snowfall conditions which primarily occur from December to February, with the heaviest being 20.4in in February, tapering off dramatically to nil from April onwards. The amount of daylight through the year fluctuates noticeably between 13.8 hours in May and 10.1 hours in December. In contrast, sunshine hours remain relatively constant from 7.8 hours in January and December to 12.4 hours at their peak in June.

The best time to visit Mount Lemmon

The optimal time for visiting Mount Lemmon is contingent on personal preference regarding whether to experience the kindest temperatures or enjoy the sunniest days. If seeking moderate temperatures, October stands as the ideal month, with maximum temperatures averaging around 70.4°F (21.3°C) and minimum temperatures averaging 45.1°F (7.3°C). Rainfall at this time is relatively low at 3.1in, providing an ideal mix of warm temperatures and limited rainfall. Daylight lasts around 11.4 hours, while sunshine graces Mount Lemmon residents for approximately 9.7 hours daily.

The worst time to visit Mount Lemmon

Mount Lemmon should ideally be avoided in August, which is not only the wettest month of the year (with an impressive 7in of rainfall) but is also the month with the couple highest average temperatures of 73.6°F (23.1°C). The possibility of torrential rains, coupled with the less comfortable climate due to high temperatures, makes this month the least suitable for visiting. However, if snow is the deterrent, February ranks as the worst time for a visit, witnessing a substantial snowfall of 20.4in.

Spring weather in Mount Lemmon

Spring mounts an intriguing transition from colder to milder months in Mount Lemmon. March sees a high average temperature of 52.9°F (11.6°C), which ascends to 60.8°F (16°C) in April and then to a warm 69.1°F (20.6°C) in May. The lower temperature averages are less striking, with March at 25.7°F (-3.5°C), April at 31.7°F (-0.2°C), and May at 36.6°F (2.6°C). The rainfall during this period is also relatively low, ranging from 1.2in in March, to 0.5in in April, and 0.3in in May.

Summer weather in Mount Lemmon

Summer in Mount Lemmon exhibits hotter temperatures alongside escalating precipitation. The high temperatures go from 76.4°F (24.7°C) in June to 76.5°F (24.7°C) in July and 73.6°F (23.1°C) in August. The lower temperature averages range from 44.4°F (6.9°C) in June, 49.8°F (9.9°C) in July and August. An increase in rainfall through these months is also observed, reaching 0.6in in June, 4.4in in July and peaking at 7in in August.

Autumn weather in Mount Lemmon

Autumn in Mount Lemmon brings a cooling pattern alongside decreasing rainfall. The high temperatures drop from 70.4°F (21.3°C) in September to 61.7°F (16.5°C) in October, and further to 56.3°F (13.5°C) in November. At the same time, lower temperatures fall from 45.1°F (7.3°C) in September to 36.4°F (2.4°C) in October and 29.7°F (-1.3°C) in November. Rainfall during these months reduces significantly to 3.4in in September, 3.1in in October, and 1.8in in November.

Winter weather in Mount Lemmon

Winter continues the cooling trend in Mount Lemmon with a reemergence of snowfall. December sees high temperatures averaging 50.6°F (10.3°C), falling to 49.2°F (9.6°C) in January and further down to 48.3°F (9.1°C) in February. Lower temperatures also decrease from 24.3°F (-4.3°C) in December to 22.8°F (-5.1°C) in January and 21.8°F (-5.7°C) in February. These temperatures facilitate snow events with snowfall recorded at 11in in December, 16.5in in January, and peaking at 20.4in in February.

Weather in January

Monthly weather in Mount Lemmon, Arizona starts off the year with a chilled note. High altitude and location in Southwestern USA characterize January with potential for significant snowfall. Snow blankets the ground, accumulating from 16.5" (419mm), offering an ideal destination for winter sports enthusiasts. Weather in January »

Weather in February

Despite being placed in the heart of winter, February in Mount Lemmon shares a surprising trait with a typical spring month - a noticeable rise in temperature. February sees a gradual transition towards spring, although the weather remains generally cold. Weather in February »

Weather in March

As spring begins to announce itself, March weather in Mount Lemmon anticipates an onset of milder temperatures. Instead of snowfall, traces of rain begin to appear. A significant change in the weather is marked by a decrease in snowfall to 6.8" (173mm). Weather in March »

Weather in April

April in Mount Lemmon, Arizona denotes a more considerable shift in weather patterns, making room for the upcoming summer months. The weather is charitably mild, resulting in comfortable outdoor activities. A considerably reduced average of snowfall down to 2" (51mm) marks April as it transcends from colder, snow-covered times of March. Weather in April »

Weather in May

May in Mount Lemmon inaugurates a complete transition from the grasp of winters to the warmth of summers. The weather eases up, bidding farewell to snow and welcoming more daylight hours. No trace of snowfall is evident, marking the transition towards a full-fledged summer cycle. Weather in May »

Weather in June

The climatic conditions of Mount Lemmon in June undoubtedly synchronizes with the arrival of summer. Embracing plentiful sunshine, the weather becomes conducive for outdoor recreation. Even the rainfall is minimal, staying constant at 0.6" (15mm), predicting a dry spell ahead. Weather in June »

Weather in July

July is the heartbeat of summer in Mount Lemmon, with temperatures peaking and the environment pulsating with vibrancy. Rainfall also makes a comeback while holding onto warm summer days. The month becomes notably humid, with rainfall shooting up to 4.4" (112mm). Weather in July »

Weather in August

August in Mount Lemmon remains under the dominion of summer. Catering to its warmest temperatures, it also accommodates the most significant rainfall of the year. An immense increase is witnessed, with rainfall quantities reaching a peak at 7" (178mm). Weather in August »

Weather in September

September signifies the beginning of departure from summers in Mount Lemmon, Arizona, with a gradual cool-off in temperatures. Despite this, clear skies and abundant sunshine remain a constant. Maintaining warmth, the monthly rainfall drops significantly to 3.4" (86mm), marking transition towards a dry period. Weather in September »

Weather in October

Fall descends upon Mount Lemmon in October, with temperatures continuing to drop and the environment basking in autumn hues. The weather takes a significantly cooler turn, providing relief from the intense summer. In comparison, rainfall recedes to 3.1" (79mm), signaling a more relaxed weather progression. Weather in October »

Weather in November

November in Mount Lemmon ushers in a unique blend of autumn and the precursory notes of winter. The weather starts taking a colder slant, preparing for the year-end chill, with rainfall falling to 1.8" (46mm). With December, the first snowflakes will make their appearance, shifting away dramatically from October's vibrant fall palette. Weather in November »

Weather in December

December weather in Mount Lemmon, Arizona, encapsulates the arrival of the year-end winter cycle. With temperatures dropping to their yearly lows, the environment exudes a cozy, holiday spirit. Snowfall plays a major role, accumulating to 11" (279mm) and transforming the landscape into a winter wonderland. Weather in December »

Frequently asked questions

How much does it rain in Mount Lemmon?

Throughout the year, there are 59 rainfall days, and 29.57" (751mm) of precipitation is accumulated.

When does it snow in Mount Lemmon?

Months with snowfall in Mount Lemmon are January through April, October through December.

How much does it snow in Mount Lemmon?

In Mount Lemmon, Arizona, during the entire year, snow aggregates up to 64.92" (1649mm).

What are the months with the least sunshine in Mount Lemmon?

The months with the least sunshine in Mount Lemmon, Arizona, are January and December, with an average of 7.8h of sunshine.

What time of the year is the coldest in Mount Lemmon?

In Mount Lemmon, February is the coldest month, with temperatures averaging a high of 48.4°F (9.1°C) and a low of 21.7°F (-5.7°C).

When does it snow the most in Mount Lemmon?

February is the month with the most snowfall in Mount Lemmon, Arizona, with 20.39" (518mm) of accumulated snow.

What is the driest month in Mount Lemmon?

May is the month with the least rainfall. Rain falls for 2 days and accumulates 0.24" (6mm) of precipitation.

When it does not snow in Mount Lemmon?

In Mount Lemmon, Arizona, snow does not fall in May through September.

What part of the year is the hottest in Mount Lemmon?

Temperatures reach their maximum during June and July, recording an average high-temperature of 76.5°F (24.7°C).

When are the longest days in Mount Lemmon?

The month with the longest days in Mount Lemmon, Arizona, is June, with an average of 14h and 12min of daylight.

What month has the most sunshine in Mount Lemmon?

The month with the most sunshine in Mount Lemmon, Arizona, is June, with an average of 12.4h of sunshine.

What is the rainiest month in Mount Lemmon?

The month with the most rainfall is August, when the rain falls for 11 days and typically aggregates up to 7.01" (178mm) of precipitation.

What is the month with the shortest days in Mount Lemmon?

With an average of 10h and 6min of daylight, December has the shortest days of the year.

Is there Daylight Saving Time (DST) in Mount Lemmon?

Mount Lemmon, Arizona, does not utilize Daylight Saving Time (DST). MST timezone is used over the entire year.

Average temperature
Mount Lemmon, AZ

Average temperature - Mount Lemmon, AZ

The warmest month (with the highest average high temperature) is July (76.5°F).
The month with the lowest average high temperature is February (48.3°F).

The months with the highest average low temperature are July and August (49.8°F).
The coldest month (with the lowest average low temperature) is February (21.8°F).

Average rainfall
Mount Lemmon, AZ

Average rainfall - Mount Lemmon, AZ

The wettest month (with the highest rainfall) is August (7").
The driest month (with the least rainfall) is May (0.3").

Average rainfall days
Mount Lemmon, AZ

Average rainfall days - Mount Lemmon, AZ

The month with the highest number of rainy days is August (11 days).
The months with the least rainy days are May and June (2 days).

Average snowfall
Mount Lemmon, AZ

Average snowfall - Mount Lemmon, AZ

The month with the highest snowfall is February (20.4").
The months with the least snowfall are May, June, July, August and September (0").

Average daylight / Average sunshine
Mount Lemmon, AZ

Average daylight / Average sunshine - Mount Lemmon, AZ

The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).

The month with the most sunshine is June (Average sunshine: 12h and 24min).
The months with the least sunshine are January and December (Average sunshine: 7h and 48min).

Mount Lemmon, Arizona, USA

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