Cornelius is a charming small city located in Washington County, Oregon, USA. Situated in the fertile Tualatin Valley, Cornelius is part of the Portland metropolitan area, providing a blend of rural tranquility and urban accessibility. The city is nestled between the larger cities of Hillsboro to the east and Forest Grove to the west, with Portland approximately 25 miles to the northeast.
The geography of Cornelius is characterized by its rich agricultural lands, rolling hills, and proximity to the Pacific Ocean, which influences its mild climate. Cornelius covers an area of about 2.01 square miles, providing a compact yet vibrant community. As of the most recent census, the population of Cornelius is approximately 12,317 residents, reflecting its small-town atmosphere and community-oriented lifestyle.
Cornelius is known for its agricultural contributions, particularly in berry farming, with several family-owned farms and orchards. One notable company in the area is SakéOne, the leading sake brewery in Oregon, which offers tours and tastings, drawing visitors from across the region.
Major landmarks in Cornelius include Harleman Park, a popular spot for community events and outdoor activities, and the Cornelius Public Library, which serves as a cultural and educational hub. The city’s close-knit community is also highlighted through annual events such as the Cornelius Summer Concerts in the Park and the Holiday Tree Lighting Ceremony.
Climate and Weather Overview
Cornelius experiences a temperate oceanic climate, characterized by mild, wet winters and warm, dry summers. The city’s climate is significantly influenced by its proximity to the Pacific Ocean, resulting in moderate temperatures year-round. Cornelius receives ample rainfall, primarily from late fall to early spring, while summers are typically sunny and dry.
Average Temperature, Precipitation, and Sunny Days
| Month | Average High (°F) | Average Low (°F) | Precipitation (inches) | Sunny Days |
|---|---|---|---|---|
| January | 47 | 34 | 5.75 | 9 |
| February | 51 | 36 | 4.74 | 10 |
| March | 55 | 38 | 4.63 | 12 |
| April | 60 | 41 | 3.31 | 15 |
| May | 67 | 46 | 2.62 | 18 |
| June | 73 | 51 | 1.73 | 21 |
| July | 80 | 55 | 0.53 | 28 |
| August | 80 | 55 | 0.75 | 27 |
| September | 74 | 51 | 1.54 | 22 |
| October | 63 | 44 | 3.36 | 15 |
| November | 52 | 38 | 6.66 | 10 |
| December | 46 | 34 | 6.78 | 8 |
Weather by Month
January
January in Cornelius is typically cold and wet, with average high temperatures around 47°F and lows near 34°F. The city receives significant rainfall, averaging 5.75 inches for the month. This period sees around 9 sunny days, offering brief respites from the otherwise damp and overcast conditions.
Natural Disasters: January can occasionally bring severe winter storms, including heavy rain and wind, leading to potential flooding and power outages.
Activities: Indoor activities are recommended, such as visiting the Cornelius Public Library, enjoying local cafes, or attending community events at indoor venues. Outdoor enthusiasts might brave the weather for bird watching or hiking in local parks during sunny intervals.
February
February continues the trend of cold and wet weather, with slightly warmer temperatures than January. Average highs reach 51°F, and lows are around 36°F. Precipitation decreases slightly to 4.74 inches, and the city enjoys about 10 sunny days.
Natural Disasters: Similar to January, winter storms can occur, though they are less frequent and severe.
Activities: February is a good month for indoor cultural activities, such as attending local theater performances or art exhibits. Outdoor activities are still limited, but the occasional sunny day might be suitable for a walk in Harleman Park.
March
March marks the beginning of spring in Cornelius, with temperatures gradually warming up. Average highs are 55°F, and lows are 38°F. Rainfall remains relatively high at 4.63 inches, but the number of sunny days increases to 12.
Natural Disasters: Early spring storms can bring heavy rains and strong winds, posing risks of localized flooding.
Activities: With more sunny days, residents and visitors can start enjoying outdoor activities like hiking and biking on local trails. Spring festivals and farmers’ markets begin to pop up, providing fresh local produce and handmade goods.
April
April brings more noticeable spring weather, with average highs of 60°F and lows of 41°F. Precipitation decreases to 3.31 inches, and sunny days increase to 15, making it a more pleasant time to be outdoors.
Natural Disasters: The risk of severe weather decreases, but heavy rains and thunderstorms can still occur.
Activities: Outdoor activities become more appealing, including gardening, picnicking in local parks, and exploring the countryside. April is also a good month for visiting local farms and participating in community clean-up events.
May
May in Cornelius is characterized by mild and increasingly warm weather. Average highs are 67°F, with lows around 46°F. Rainfall continues to decrease, averaging 2.62 inches, and the city enjoys about 18 sunny days.
Natural Disasters: The likelihood of natural disasters is low in May.
Activities: May is ideal for outdoor activities like hiking, cycling, and exploring local wineries. The pleasant weather also makes it a great time for community events, outdoor markets, and gardening.
June
June signals the start of summer, with average high temperatures reaching 73°F and lows around 51°F. Precipitation drops to 1.73 inches, and there are about 21 sunny days.
Natural Disasters: Natural disaster risks are minimal during June.
Activities: June is perfect for outdoor adventures, including hiking, camping, and visiting local parks and natural reserves. The warmer weather is also ideal for attending outdoor concerts and festivals.
July
July is the warmest month in Cornelius, with average highs of 80°F and lows of 55°F. Rainfall is minimal, averaging 0.53 inches, and the city enjoys about 28 sunny days.
Natural Disasters: The risk of natural disasters is very low, though occasional heatwaves can occur.
Activities: July offers the best conditions for outdoor activities, such as swimming, hiking, and picnicking. The city hosts numerous outdoor events, including the Cornelius Summer Concerts in the Park.
August
August continues the warm, dry summer trend with average highs of 80°F and lows of 55°F. Precipitation remains low at 0.75 inches, and there are about 27 sunny days.
Natural Disasters: Similar to July, the risk of natural disasters is low, though heatwaves are possible.
Activities: August is an excellent month for outdoor activities like visiting local farms, hiking, and participating in community events. The dry weather is perfect for exploring the region’s natural beauty.
September
September brings the beginning of fall, with cooler temperatures. Average highs are 74°F, and lows are 51°F. Rainfall increases slightly to 1.54 inches, and the city enjoys about 22 sunny days.
Natural Disasters: The risk of natural disasters remains low, but occasional early fall storms can occur.
Activities: September is a great time for outdoor activities like apple picking, visiting pumpkin patches, and hiking. The cooler weather also makes it ideal for attending fall festivals and local fairs.
October
October sees more significant cooling, with average highs of 63°F and lows of 44°F. Precipitation increases to 3.36 inches, and sunny days decrease to 15.
Natural Disasters: The likelihood of severe weather increases, with the possibility of early winter storms and heavy rains.
Activities: October is perfect for enjoying fall foliage, visiting local orchards, and participating in Halloween events. Indoor activities such as attending local theater performances and art exhibits are also popular.
November
November is marked by cooler and wetter conditions, with average highs of 52°F and lows of 38°F. Precipitation is substantial, averaging 6.66 inches, and there are about 10 sunny days.
Natural Disasters: November can bring heavy rainstorms and strong winds, posing risks of flooding and power outages.
Activities: Indoor activities are more suitable, such as visiting the Cornelius Public Library, enjoying local cafes, and attending community events at indoor venues. Outdoor enthusiasts might still find opportunities for hiking and bird watching during sunny intervals.
December
December is the coldest month in Cornelius, with average highs of 46°F and lows of 34°F. Precipitation peaks at 6.78 inches, and the city experiences around 8 sunny days.
Natural Disasters: Winter storms, including heavy rain and wind, can occur, leading to potential flooding and power outages.
Activities: Indoor activities are recommended, such as visiting the Cornelius Public Library, enjoying local cafes, or attending community events at indoor venues. The holiday season also brings various festive events and activities, making it a joyful time despite the cold weather.