The climate of Keizer
Recognized by the Köppen Climate Classification system as a 'Csb' climate,
Keizer,
Oregon, USA, experiences a type of Mediterranean Climate, known for its warm summers. Documented history of weather patterns showcases overall a mild climate throughout the year, imbued with slight variations in weather conditions.
The average high temperature peaks in
July at 82°F (27.8°C), before receding gradually towards the year-end to 45.5°F (7.5°C) in
December. Conversely, conditions are coldest in the first month,
January, seeing a low average temperature of 35.2°F (1.8°C), warming up slowly reaching a high of 54.1°F (12.3°C) in
August.
Relative humidity follows a symmetrical trend, fluctuating from a high of 86% in January and
February, dropping down to 65% in August, and climbing back to 86% by year-end. Keizer experiences more rainfall from
November to
March, with December recording the highest showers of 3.94" (100mm). Rainfall gradually diminishes as the year progresses, with July and August witnessing the least amount of rainfall: a minimum of 0.28" (7mm).
Interestingly, the city sees human-dwarfing amounts of snowfall mainly from November to March, with negligible amounts otherwise. This fluctuation in snowfall closely aligns with the daily hours of daylight reported, the longest being from
May to July, approximately ranging from 14.9 hours to 15.6 hours.
Between the months of
June and August, there lies a significant increase in daylight hours and sunshine hours, reducing the frequency of cloud cover. This seasonal contrast is primarily driven by the Earth’s tilt and orbit around the sun.
The best time to visit Keizer
With the Mediterranean climate offering balmy summers, the most recommended time to visit
Keizer ranges from
June to
August. These summer months offer an ideal window to experience the warm hospitality of the city under the abundant sunshine, receiving up to 9.5 to 11 sunlight hours per day. Alongside, favorable conditions include the lowest relative humidity ranging from 67% to 65%, least rainfall averaging 0.28" (7mm) to 0.31" (8mm), and overall longer daylight hours.
The worst time to visit Keizer
Due to the cold snaps, reduced sunlight, and increased levels of snow and rain, the months between
November and
March make for the least favorable times to visit
Keizer. A low UV index around 2, lower visibility, 5 miles, and a peak average rainfall of 3.94" (100mm) in
December make it challenging for navigation and sightseeing around the city.
Spring weather in Keizer
Spring arrives in
Keizer from
March until
May. Throughout this period, Keizerites witness an upswing in temperature, rising from an average low of 37.4°F (3°C) in March to 42.8°F (6°C) in May. Similarly, high temperatures also escalate from 52.9°F (11.6°C) in March to 66.7°F (19.3°C) in May. Spring months observe a relative reduction in the volume of rainfall, with the month of May recording the lowest average rainfall of spring, at 1.46" (37mm). This season is marked by an increase in daylight hours, from 12 hours in March to 14.9 hours in May.
Summer weather in Keizer
Stretching from
June to
August, summer in
Keizer offers its residents an extended period of warmth and longer daylight hours, reaching up to 15.6 hours in June. Average high temperatures scale up to 82°F (27.8°C) in the month of
July offering perfect conditions for outdoor activities. July and August are the driest months with minor rainfall observed, a minimal 0.28" (7mm) in July and slightly more, 0.31" (8mm) in August.
Autumn weather in Keizer
Autumn in
Keizer, spanning from
September through
November, introduces a decrease in average high temperatures, ranging from 74.7°F (23.7°C) in September to 51.8°F (11°C) in November. Rainfall begins to increase from 1.22" (31mm) in September to 2.72" (69mm) in November and days start getting shorter with daylight hours decreasing from 12.5 hours in September to 9.6 hours in November.
Winter weather in Keizer
Winters in
Keizer extend from
December to
February. During these months, average high temperatures can fall to 45.5°F (7.5°C) in December with conditions somewhat improving to 48.7°F (9.3°C) in February. Winter months are paired with increased precipitation, with December recording the maximum average rainfall of 3.94" (100mm). The daylight hours shrink to their smallest, with average daily light only lasting for 8.8 hours in December.
Weather in January
January weather in
Keizer,
Oregon is characterized by a substantial amount of rainfall and limited daylight. Corners of the city are covered in a light dusting of snow for about 0.9 days of the month with a snowfall of 0.43" (11mm).
Weather in January » Weather in February
February heralds a slight increase in temperatures in
Keizer,
Oregon, although it still remains firmly in the winter season. The month sees a bit more snowfall compared to
January, with a total of 1.18" (30mm) spread across 1.8 days.
Weather in February » Weather in March
March introduces a slight shift in the weather pattern in
Keizer,
Oregon, with temperatures rising a little more, and the frequency of rain increasing significantly. The rainfall is a notable 2.99" (76mm), the third highest in the year, making it one of the wettest months on record.
Weather in March »
Weather in April
April marks the departure from more frigid temperatures, and commences the arrival of the idyllic spring weather in
Keizer,
Oregon. Rainfall decreases to 2.32" (59mm), signalling a push towards drier conditions. The climate is typified by a blend of gentle breezes, balmy afternoons, and mild, calm nights.
Weather in April » Weather in May
May ushers in a noticeable improvement in the atmospheric conditions in
Keizer,
Oregon, with the advent of the warmer, drier weather that precedes summer. Rainfall diminishes to 1.46" (37mm), indicating the transition from the rainy season to one of more dryness and warmth.
Weather in May » Weather in June
June is seen as the official commencement of summer in
Keizer,
Oregon, signified by marked increases in both temperature and hours of sunlight. The rainfall shrinks to 1.02" (26mm), making it the driest month since the onset of the new year.
Weather in June »
Weather in July
July is famously the hottest month in
Keizer,
Oregon, offering amiable summer weather that's perfect for vacationing or cooling off by the refreshing river. This month records the highest temperature of 80.8°F (27.1°C) and a significant dip in rainfall to 0.28" (7mm).
Weather in July » Weather in August
In
Keizer,
Oregon,
August carries forward the summer's heat from
July, but with slightly cooler temperatures. Even though it's the peak of summer, the rainfall is minimal at 0.31" (8mm), so conditions remain arid. This period signifies the last stretch of the summer season.
Weather in August »Weather in September
September hosts a shift from the warm summer climate to a cooler autumn atmosphere in
Keizer,
Oregon. It receives the first sign of significant rainfall since the onset of summer, standing at 1.22" (31mm). The breezy coolness of the upcoming fall makes its presence known.
Weather in September »
Weather in October
October delivers a fully-fledged autumnal climate in
Keizer,
Oregon, characterized by cool breezes and colorful foliage. The rainfall picks up the pace, registering at a noticeable 2.4" (61mm). The leaves start to turn into shades of orange, yellow, and red, aligning with the archetypal autumn appearance.
Weather in October » Weather in November
November unfurls an amalgamation of late autumn and early winter weather in
Keizer,
Oregon. With the second-highest average temperature drop of the year and an increase in rainfall to 2.72" (69mm), November ushers in winter. A stark contrast between the falling leaves of November and the arrival of winter creates a mosaic of seasons.
Weather in November » Weather in December
December culminates the year with classic winter weather in
Keizer,
Oregon. This month registers the highest rainfall at 3.94" (100mm), signaling the onset of the rainy winter season. The air is filled with a constant chill, the skies often blanketed by pale gray clouds.
Weather in December »