Temperatures in May
It's cold in May in Keystone with an average temperature of 7°C. Temperatures this month range from a low of 4°C to a high of 10°C. At night, you can expect temperatures between -3°C and 2°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Keystone in May. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of May
The month of May starts in Keystone with cold temperatures, averaging around 6°C during the day and nights close to -1°C. A few showers might pop up in the first days of the month, but the weather remains mostly sunny and dry.
Mid-May
By mid-May, the average daytime temperature rises to around 8°C, with nights close to 1°C. Not much precipitation expected during this period. It’s mostly dry with sunshine.
End of May
By the end of May, the average daytime temperature in Keystone will be around 9°C, with nights close to 1°C. A shower might show up, but overall the weather will be dry and sunny.
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Precipitation in May
In May, there is an average of 36 mm of precipitation, spread over 9 days. Of the total precipitation, about 28 cm falls as snow in May. The wind speed is around 5 Bft, mostly coming from the Southwest.
The average precipitation chance is 30% per day this month. Though it seems pretty low, the weather’s variable. Some days have higher and others lower precipitation chances, which lowers the average.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in May for Keystone. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Keystone in May |
London | ||
|---|---|---|---|
 Average Temperature |
7°C | 18°C | |
 High Temp |
10°C | 21°C | |
| Low Temp |
4°C | 15°C | |
 Total Precipitation |
36 mm | 46 mm | |
| Rainy Days |
9 days | 8 days | |
 Total Snowfall |
28 cm | 0 cm | |
| Snowy Days |
12 days | 0 days | |
April
UV index
The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Temperature records for Keystone in May
With 18°C, Keystone hit the highest temperature in the last 10 years in May 2017. The lowest daytime temperature in this month was -8°C in 2016. The extreme night temperatures ranged from a low of -13°C to a high of 8°C.
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Daily Temperature in May in Keystone
This chart shows the average daily temperatures, both day and night, for each day in May in Keystone, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in May in Keystone
The chart below shows the average daily precipitation in May for Keystone, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for May, you can expect around 9 days of rain in Keystone.
Daily Snowfall in May in Keystone
This chart shows the average daily snowfall in May in Keystone, measured in centimetres. The bottom of the chart shows the days of the month. The data is based on historical measurements and gives an idea of the average snowfall in May.
Daily UV Index in May in Keystone
This chart shows the average daily UV index in May in Keystone, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in May in Keystone Over the Years
This chart shows the average temperature in May in Keystone, measured in degrees Celsius, over the past years.
Total Precipitation in May in Keystone Over the Years
This chart shows the average precipitation in May in Keystone, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Snowfall in May in Keystone per year
This chart shows the average snowfall in May in Keystone, measured in centimetres, over the past years.
Daily climate in May for Keystone
Click on a specific day in May for detailed info on the typical weather on that day in Keystone. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in May in Keystone
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Average Weather in Keystone by Month
Click on a month below to see detailed weather info for Keystone. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
