Climate and monthly weather forecast
Lebanon, OR

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The climate of Lebanon

Lebanon, Oregon, situated within the United States, showcases a warm-summer Mediterranean climate, denoted as 'Csb' under Köppen climate classification. A hint of predictability accompanies this climate, yet an intriguing spectrum of seasonal variations in weather conditions can be observed throughout the year.

Temperature in Lebanon oscillates gently over the year. The heat peaks in July and August with an average high of 81.1°F (27.3°C), and descends to its low in December with average low of 34.2°F (1.2°C). The degree of humidity as well as cloud coverage can also fluctuate, with the highest recorded in December and January at 86% and the lowest in August at 66%. Such data indicates an air saturated with moisture during winters while relatively drier conditions during summers.

Precipitation patterns reveal interesting dynamics. Rainfall reaches its zenith in December with an average of 4.41" (112mm) spread over 18 days, and drops to its nadir in July with a meager 0.24" (6mm) on an average of 3.8 days. As with snowfall, the frequency and volume are minimal, with the maximum being 2.13" (54mm) in February, taking place over 2.5 days.

A peculiar sunshine duration pattern characterizes Lebanon. Longest daylight extends up to 15.5 hours in June, and shrinks to 8.9 hours in December. Correspondingly, sunshine hours peak in July through August, from 11.1 hours to 11.2 hours a day. On the other hand, wind speed remains relatively stable throughout the year, around 5mph (8km/h).

The best time to visit Lebanon

Ideal time to explore Lebanon would fall between June and August when the city experiences its warmest temperatures and enjoys the maximum sunlight duration. It is worth mentioning that during these months, rainfall is insignificant permitting outdoor activities without interruptions.

The worst time to visit Lebanon

Travelers may want to avoid a trip to Lebanon between November and February. The region grapples with lower temperatures, diminished daylight hours, and increased precipitation, especially rain, during these months, which might hinder outdoor tourism activities.

Spring weather in Lebanon

Spring arrives in Lebanon from March until May with temperatures slowly climbing from an average high of 51.6°F (10.9°C) in March to 65.3°F (18.5°C) by May. During this period, relative humidity drops and rainfall gradually decreases while sunshine duration increases, making conditions pleasant for outdoor activities.

Summer weather in Lebanon

Summer, extending from June to August, underlines the peak of Lebanon's warm weather with temperatures reaching up to 81.1°F (27.3°C). It is the sunniest period of the year with maximum daylight hours reaching up to 15.5 hours in June. Additionally, during these months, Lebanon experiences the lowest precipitation, signifying a perfect time for outdoor activities.

Autumn weather in Lebanon

Autumn in Lebanon, spanning from September to November, is identified by a gradual descent in temperatures down from an average high of 73.4°F (23°C) in September to a moderate 51.4°F (10.8°C) in November. Along with this, a noticeable increase in rainfall across the period can be observed.

Winter weather in Lebanon

Winter in Lebanon, from December to February, showcases the coldest months with temperatures dropping to an average low of 34.2°F (1.2°C) in December. Together with lower temperatures, the duration of daylight shrinks to its minimum in December at 8.9 hours. Rainfall becomes more frequent in this season, whereas snowfall, however, remains quite minimal.

Weather in January

Weather pattern in Lebanon, Oregon transitions into the new year with a continuation of cool temperatures, overcast skies, and plenty of precipitation. A rise in the average high temperature occurs, peaking at 47.7°F (8.7°C). Weather in January »

Weather in February

February in Lebanon exhibits gradual alterations in weather patterns, while remaining predominantly cloudy and rain-laden. The most notable variation is observed in snowfall — from 1.02" (26mm) in January to 2.13" (54mm) in February. Weather in February »

Weather in March

Switching to March, the chill in Lebanon's atmosphere begins to wane, paving the way for a warmer climate. Increase in average high and low temperatures by about 3°F (-16.1°C) from the prior month makes the transition apparent. Weather in March »

Weather in April

As Spring advances in Lebanon, the town begins to experience a distinct shift in weather patterns. An increased average high temperature signals the waning of cooler temperatures, climbing from 51.6°F (10.9°C) in March to 57.6°F (14.2°C) in April. Weather in April »

Weather in May

May carries with it significantly warmer weather in Lebanon. It witnesses a dramatic reduction in rainfall from the preceding months, experiencing a substantial dip to 1.85" (47mm). The increasing temperature also makes itself evident, as it rises above the 60°F (15.6°C) mark for the average high. Weather in May »

Weather in June

June is a transition period into the warmer months in Lebanon. From 65.3°F (18.5°C) to 70.9°F (21.6°C), the jump in the average high temperature is evident. This mid-year month wins the title for the longest days, with an abundance of sunshine and maximum daylight hours. Weather in June »

Weather in July

The summer heat manifests fully in July as Lebanon witnesses the highest average temperatures of the year. Peaking at 79.5°F (26.4°C), the upward temperature trend from previous months reaches its zenith. Combined with this, July experiences minimum rainfall, reducing to a sweat 0.24" (6mm), thus becoming the driest month of the year. Weather in July »

Weather in August

August continues to showcase the peak summer weather in Lebanon. The average high temperature rises slightly, registering a pinnacle at 81.1°F (27.3°C). Although the moisture content increases slightly with an increment to 0.31" (8mm) of rainfall, the weather remains predominantly dry and hot. Weather in August »

Weather in September

Fall starts to make its presence known in September in Lebanon, as the weather starts cooling down. From 81.1°F (27.3°C) in August, a downturn in average high temperatures is noticeable, dropping to 73.4°F (23°C). Besides the temperature, the sunshine duration also dwindles, giving way to longer nights. Weather in September »

Weather in October

Lebanon greets autumn in October with temperatures lowering yet further. The most remarkable feature of the month is a sharp increase in the average monthly rainfall to 2.68" (68mm). Cooler temperatures accompanied with decreased sunshine hours prevail, with many a leaf turning autumnal hues. Weather in October »

Weather in November

As Lebanon, Oregon transitions into late Autumn, weather changes become more noticeable. Notably, the average high temperature further declines to 51.4°F (10.8°C), manifesting November as one of the cooler months in the year. Weather in November »

Weather in December

December, the final month of the year, brings with it the coldest temperatures and the highest rainfall averages. The weather in December witnesses a significant increase in precipitation, leading to the peak monthly rainfall average of 4.41" (112mm). Weather in December »
Updated: Aug 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the most humid months?

January through March and December, with an average relative humidity of 86%, are most humid months in Lebanon, Oregon.

How many days does it rain?

In Lebanon, during the entire year, the rain falls for 163.3 days and collects up to 29.92" (760mm) of precipitation.

When does it snow?

January through March, November and December are months with snowfall.

How many days does it snow?

In Lebanon, during the entire year, snow falls for 5.6 days and aggregates up to 4.09" (104mm) of snow.

What is the month with the lowest UV index?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the snowiest month?

The month with the most snowfall is February, when snow falls for 2.5 days and typically aggregates up to 2.13" (54mm) of snow.

What is the month with the least sunshine?

The month with the least sunshine is February, with an average of 4.2h of sunshine.

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.

When it does not snow?

In Lebanon, snow does not fall in April through October.

When are the longest days?

With an average of 15h and 30min of daylight, June has the longest days of the year.

What is the driest month?

July is the month with the least rainfall. Rain falls for 3.8 days and accumulates 0.24" (6mm) of precipitation.

What is the month with the highest UV index?

The month with the highest UV index is July, with an average maximum UV index of 6.

What month is the hottest?

August is the warmest month of the year, registering average temperatures as high as 81.1°F (27.3°C) and as low as 51.8°F (11°C).

What is the least humid month in Lebanon?

With an average relative humidity of 66%, August is the least humid month.

What month has the most sunshine?

August has the most sunshine of the year, with an average of 11.2h of sunshine.

What are the coldest months?

The coldest month is December, with an average high-temperature of 45.3°F (7.4°C) and an average low-temperature of 34.2°F (1.2°C).

What is the rainiest month?

December is the month with the most rainfall. Rain falls for 18 days and accumulates 4.41" (112mm) of precipitation.

What is the month with the shortest days?

With an average of 8h and 54min of daylight, December has the shortest days of the year.

Average temperature
Lebanon, OR

Average temperature - Lebanon, OR

The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (45.3°F).

The month with the highest average low temperature is August (51.8°F).
The coldest month (with the lowest average low temperature) is December (34.2°F).

Average pressure
Lebanon, OR

Average pressure - Lebanon, OR

The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).

Average wind speed
Lebanon, OR

Average wind speed - Lebanon, OR

The windiest months (with the highest average wind speed) are January and March (5.1mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).

Average humidity
Lebanon, OR

Average humidity - Lebanon, OR

The months with the highest relative humidity are January, February, March and December (86%).
The month with the lowest relative humidity is August (66%).

Average rainfall
Lebanon, OR

Average rainfall - Lebanon, OR

The wettest month (with the highest rainfall) is December (4.41").
The driest month (with the least rainfall) is July (0.24").

Average rainfall days
Lebanon, OR

Average rainfall days - Lebanon, OR

The month with the highest number of rainy days is March (20.1 days).
The months with the least rainy days are July and August (3.8 days).

Average snowfall
Lebanon, OR

Average snowfall - Lebanon, OR

The month with the highest snowfall is February (2.13").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days
Lebanon, OR

Average snowfall days - Lebanon, OR

The month with the highest number of snowfall days is February (2.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight / Average sunshine
Lebanon, OR

Average daylight / Average sunshine - Lebanon, OR

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

The month with the most sunshine is August (Average sunshine: 11h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).

Average sunshine days
Lebanon, OR

Average sunshine days - Lebanon, OR

The month with the most sunshine days is July (25.6 days).
The month with the least sunshine days is March (9.1 days).

Average UV index
Lebanon, OR

Average UV index - Lebanon, OR

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Lebanon, Oregon, USA

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