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The coldest month is December with an average daily high temperature of 46.9 °F (8.3 °C), although overnight lows usually remain above freezing by a few degrees. Evening temperatures fall to or below freezing 32 nights per year on average, but very rarely below 18 °F (−8 °C).
The monthly average high temperature ranges from roughly 30 °F (−1 °C) in January to around 80 °F (27 °C) in July. Daily high temperatures reach or exceed 90 °F (32 °C) on only four days per year on average, while cold-season lows of 0 °F (−18 °C) or below are reached on 10 nights per year on average. [29] The area can be affected ...
The lowest occurred on February 9, 1933, in Ukiah, and again on February 10, 1933, in Seneca, also both east of the Cascades, when the temperature dropped to −54 °F (−48 °C). [6] The temperature in the Willamette Valley is mild compared to the desert regions of the state, with high temperatures at or above 90 °F (32 °C) occurring only ...
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Hillsboro receives precipitation on 161 days per year, on average. [53] The average yearly precipitation between 1930 and 1998 was 38 in (970 mm). [54] August is the warmest month with an average high temperature of 81 °F (27 °C), while January is the coolest month with an average high of 46 °F (8 °C). [55]
February is the third chilliest, having a mean temperature of 51 degrees, with an average high of 61 degrees and an average low of 40 degrees. February 1904 saw the temperature reach 96 degrees ...
The third letter indicates the degree of summer heat—a indicates warmest month average temperature above 22 °C (71.6 °F) while b indicates warmest month averaging below 22 °C but with at least four months averaging above 10 °C (50.0 °F), and c indicates one to three months averaging above 10 °C (50.0 °F). [8] [10] [7]
A similar scenario is expected in Portland, where temperatures will flirt with the 100-degree mark, about 5-15 degrees above the historical average, ... and monthly record-high temperatures in ...