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Weather data for motor racing
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For Washington The wettest month for Washington
The information presented below gives detailed historical monthly average weather conditions along with exceptional weather occurrences. To maintain relevance to current weather trends the displayed information has been calculated using data collected over the past two decades. The climate profile is taken from closest available data source to Whittemore Speedway.
Throughout the month of April daytime temperatures will generally reach highs of around 11°C that's about 53°F. At night the average minimum temperature drops down to around 0°C, that's 33°F.
In recent times the highest recorded temperature in April has been 31°C that's 88°F, with the lowest recorded temperature -14°C, about 7°F.
The average daily relative humidity for April is around 67%.
The Heat Index is a measure of how hot it feels when relative humidity is added to actual air temperature. From this a comfort level is calculated providing categories on how heat conditions might adversely affect someone.
Comfort Levels: Given average maximum temperatures and humidity levels generally you should not anticipate any discomfort from heat (see heat index for more information).
The average daily wind speed in April has been around 15 km/h, that’s the equivalent to about 10 mph, or 8 knots. In recent years the maximum sustained wind speed has reached 70 km/h, that’s the equivalent of around 44 mph, or 38 knots.
On average the month of April is affected by foggy conditions on 3 days.
The following charts show yearly weather trends with information on monthly weather averages and extremes.
The chart below plots the average high and low temperature for each month of the year. It also shows the maximum and minimum recorded temperatures.
The chart below plots the average number of days in any month that you can expect to see rain falling.
The chart below plots the average number of days in any month that you can expect to see snow falling.
The chart below plots the average daily wind speed you can expect for any month. It also shows the maximum recorded sustained wind speed for each month.