Climate - Pendleton (Oregon)

The climate of Pendleton is semi-arid continental, with cold winters and hot summers. The scarce rainfall occurs in the cold semester, while the summer is sunny.
The city is located in northeastern Oregon, 400 meters (1,300 ft) above sea level. A short distance away, we find the valley of the Columbia River, where the city of Hermiston is located.
In winter, cold waves are possible, during which the temperature can drop to -20 °C (-4 °F) or even below. In December 1990, it reached -26.7 °C (-16 °F). Snowfalls are quite frequent, but generally not abundant. On average, 40 cm (15.7 in) of snow fall per year.
In summer, there are several very hot days. On the hottest days of the year, the temperature generally reaches 38/39 °C (100/102° F), but sometimes even higher. At the end of June 2021, during an exceptional heat wave, the temperature reached 47.2 °C (117 °F).
The average temperature of the coldest month (December) is of 1.2 °C (34.2 °F), that of the warmest month (July) is of 22.8 °C (73 °F). Here are the average temperatures.

Precipitation amounts to 325 millimeters (12.8 inches) per year: it is therefore scarce. It ranges from 5 mm (0.2 in) in the driest month (July) to 40 mm (1.6 in) in the wettest ones (January, December). Here is the average precipitation.

Best Time

The best times to visit Pendleton are spring and autumn, and in particular the months of May and September, to avoid both the winter cold and the summer heat.

Back to the climate of Oregon.

Pendleton - Weather by month

Based on the period 1991-2020

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In January, the weather in Pendleton is usually cold. The average temperature is of 1.6 °C (35 °F), with a minimum of -2.2 °C (28 °F) and a maximum of 5.4 °C (41.7 °F).
On the coldest nights of the month, the temperature usually drops to around -11.5 °C (11.5 °F). However, it dropped to -23.9 °C (-11 °F) in January 1996.
On the warmest days of the month, the temperature usually reaches around 16 °C (60.5 °F). However, it reached 20.6 °C (69.1 °F) in January 2012.
Precipitation amounts to 40 mm (1.6 in), distributed over 12 days.
The day lasts on average 9 hours and 10 minutes.
The average humidity is 79%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).

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In February, the weather in Pendleton is usually cold. The average temperature is of 3.3 °C (38 °F), with a minimum of -1.3 °C (29.6 °F) and a maximum of 8 °C (46.4 °F).
On the coldest nights of the month, the temperature usually drops to around -9 °C (16 °F). However, it dropped to -24.5 °C (-12.1 °F) in February 1996.
On the warmest days of the month, the temperature usually reaches around 17 °C (62 °F). However, it reached 23.9 °C (75 °F) in February 1996.
Precipitation amounts to 30 mm (1.2 in), distributed over 10 days.
The day lasts on average 10 hours and 25 minutes.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is 12 kph (8 mph).

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In March, the weather in Pendleton is usually quite mild. The average temperature is of 6.9 °C (44 °F), with a minimum of 0.9 °C (33.7 °F) and a maximum of 12.8 °C (55 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -5 °C (23 °F). However, it dropped to -17.2 °C (1 °F) in March 1993.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 20.5 °C (69.5 °F). However, it reached 26.7 °C (80.1 °F) in March 2004.
Precipitation amounts to 35 mm (1.4 in), distributed over 12 days.
The day lasts on average 12 hours and 0 minutes.
The average humidity is 65%.
The average wind speed is 14 kph (9 mph).

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In April, the weather in Pendleton is usually mild. However, there are remarkable differences between night and day. The average temperature is of 10.0 °C (50 °F), with a minimum of 3.5 °C (38.3 °F) and a maximum of 16.6 °C (61.8 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -2 °C (28.5 °F). However, it dropped to -5 °C (23 °F) in April 2007.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 25.5 °C (77.5 °F). However, it reached 31 °C (87.8 °F) in April 1998.
Precipitation amounts to 30 mm (1.2 in), distributed over 10 days.
The day lasts on average 13 hours and 35 minutes.
The average humidity is 58%.
The average wind speed is 15 kph (10 mph).

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In May, the weather in Pendleton is usually mild. However, there are remarkable differences between night and day. The average temperature is of 14.4 °C (58 °F), with a minimum of 7.2 °C (45 °F) and a maximum of 21.6 °C (70.9 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 1 °C (33.5 °F). However, it dropped to -3.3 °C (26.1 °F) in May 2013.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 31.5 °C (88.5 °F). However, it reached 36.1 °C (97 °F) in May 1993.
Precipitation amounts to 35 mm (1.4 in), distributed over 10 days.
The day lasts on average 15 hours and 0 minutes. So the days are long.
The average humidity is 54%.
The average wind speed is 15 kph (9 mph).

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In June, the weather in Pendleton is usually warm. However, there are remarkable differences between night and day. The average temperature is of 18.1 °C (65 °F), with a minimum of 10.4 °C (50.7 °F) and a maximum of 25.8 °C (78.4 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 5 °C (41 °F). However, it dropped to 1.7 °C (35.1 °F) in June 1991.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 35 °C (95 °F). However, it reached 42.8 °C (109 °F) in June 2015.
Precipitation amounts to 25 mm (1 in), distributed over 6 days.
The day lasts on average 15 hours and 40 minutes. So the days are long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
The average humidity is 47%.
The average wind speed is 15 kph (9 mph).

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In July, the warmest month of the year, the weather in Pendleton is usually warm to hot. However, there are remarkable differences between night and day. The average temperature is of 22.8 °C (73 °F), with a minimum of 13.7 °C (56.7 °F) and a maximum of 31.8 °C (89.2 °F).
On the coldest nights of the month, the temperature usually drops to around 8.5 °C (47 °F). However, it dropped to 5 °C (41 °F) in July 2012.
On the warmest days of the month, the temperature usually reaches around 39 °C (102.5 °F). However, it reached 42.8 °C (109 °F) in July 2002.
Precipitation amounts to only 5 mm (0.2 in), distributed over 2 days.
The day lasts on average 15 hours and 20 minutes. So the days are long.
The average humidity is 35%.
The average wind speed is 14 kph (9 mph).

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In August, the weather in Pendleton is usually warm. However, there are remarkable differences between night and day. The average temperature is of 22.1 °C (72 °F), with a minimum of 13.3 °C (56 °F) and a maximum of 30.9 °C (87.6 °F).
On the coldest nights of the month, the temperature usually drops to around 8 °C (46.5 °F). However, it dropped to 5.6 °C (42.1 °F) in August 1993.
On the warmest days of the month, the temperature usually reaches around 38.5 °C (101 °F). However, it reached 43.3 °C (109.9 °F) in August 1998.
Precipitation amounts to 10 mm (0.4 in), distributed over 2 days.
The day lasts on average 14 hours and 0 minutes.
The average humidity is 36%.
The average wind speed is 14 kph (8 mph).

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In September, the weather in Pendleton is usually very mild. However, there are remarkable differences between night and day. The average temperature is of 17.5 °C (64 °F), with a minimum of 9.4 °C (49 °F) and a maximum of 25.6 °C (78 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 3.5 °C (38 °F). However, it dropped to -1.1 °C (30 °F) in September 2000.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 34 °C (93 °F). However, it reached 37.8 °C (100 °F) in September 1998.
Precipitation amounts to 15 mm (0.6 in), distributed over 4 days.
The day lasts on average 12 hours and 30 minutes.
The average humidity is 44%.
The average wind speed is 13 kph (8 mph).

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In October, the weather in Pendleton is usually mild. However, there are remarkable differences between night and day. The average temperature is of 10.8 °C (51 °F), with a minimum of 4.1 °C (39.4 °F) and a maximum of 17.5 °C (63.5 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around -3.5 °C (26 °F). However, it dropped to -11.1 °C (12 °F) in October 2019.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 27 °C (80.5 °F). However, it reached 32.8 °C (91 °F) in October 2008.
Precipitation amounts to 30 mm (1.2 in), distributed over 8 days.
The day lasts on average 10 hours and 55 minutes.
The average humidity is 60%.
The average wind speed is 12 kph (8 mph).

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In November, the weather in Pendleton is usually quite cold. The average temperature is of 4.8 °C (41 °F), with a minimum of 0.2 °C (32.3 °F) and a maximum of 9.5 °C (49.1 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around -7.5 °C (18.5 °F). However, it dropped to -21.1 °C (-6 °F) in November 2010.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 19 °C (66.5 °F). However, it reached 27 °C (80.6 °F) in November 1999.
Precipitation amounts to 35 mm (1.4 in), distributed over 12 days.
The day lasts on average 9 hours and 30 minutes.
The average humidity is 75%. Hence, the air is normally humid.
The average wind speed is 12 kph (8 mph).

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In December, the coldest month of the year, the weather in Pendleton is usually cold. The average temperature is of 1.2 °C (34 °F), with a minimum of -2.5 °C (27.5 °F) and a maximum of 4.9 °C (40.8 °F).
On the coldest nights of the month, the temperature usually drops to around -11 °C (12 °F). However, it dropped to -23.3 °C (-9.9 °F) in December 2008.
On the warmest days of the month, the temperature usually reaches around 15.5 °C (59.5 °F). However, it reached 18.9 °C (66 °F) in December 2004.
Precipitation amounts to 40 mm (1.6 in), distributed over 12 days.
The day lasts on average 8 hours and 40 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
The average humidity is 79%. Hence, the air is normally humid.
The average wind speed is 12 kph (7 mph).