Weather Statistics

Weather, Forecast, Temperature and Precipitation Statistics

2010 Weather Summary Lyon Iowa United States
Weather Index 55 49 100
Hail Index 72 121 100
Hurricane Index 0 2 100
Tornado Index 94 116 100
 
Annual Maximum Avg. Temperature 59.0 °F      58.0 °F    N/A
Annual Minimum Avg. Temperature 38.0 °F 38.0 °F N/A
Annual Avg. Temperature 48.5 °F 48.3 °F N/A
Annual Heating Degree Days (Tot Degrees < 65)       6,893 6,919 N/A
Annual Cooling Degree Days (Tot Degrees > 65) 907 862 N/A
Percent of Possible Sunshine 61 60 N/A
Mean Sky Cover (Sunrise to Sunset - Out of 10) 6 6 N/A
Mean Number of Days Clear (Out of 365 Days) 105 100 N/A
Mean Number of Days Rain (Out of 365 Days) 99 106 N/A
Mean Number of Days Snow (Out of 365 Days) 10 11 N/A
Avg. Annual Precipitation (Total Inches) 26.00" 32.00" N/A
Avg. Annual Snowfall (Total Inches) 32.00" 34.00" N/A

2010 Average Monthly Low Temperature               Lyon Iowa United States
Avg. Annual Low Temperature 34.8 °F      37.6 °F    N/A
Avg. January Low Temperature 5.4 °F 9.4 °F N/A
Avg. February Low Temperature 10.2 °F 14.0 °F N/A
Avg. March Low Temperature 22.2 °F 25.0 °F N/A
Avg. April Low Temperature 34.9 °F 37.6 °F N/A
Avg. May Low Temperature 46.6 °F 48.9 °F N/A
Avg. June Low Temperature 56.8 °F 58.7 °F N/A
Avg. July Low Temperature 61.4 °F 62.9 °F N/A
Avg. August Low Temperature 59.2 °F 60.5 °F N/A
Avg. September Low Temperature 49.4 °F 51.6 °F N/A
Avg. October Low Temperature 37.3 °F 40.1 °F N/A
Avg. November Low Temperature 23.4 °F 27.2 °F N/A
Avg. December Low Temperature 11.3 °F 15.3 °F N/A
 
2010 Average Monthly High Temperature               Lyon Iowa United States
Avg. Annual High Temperature 57.6 °F      58.6 °F     N/A
Avg. January High Temperature 25.5 °F 27.7 °F N/A
Avg. February High Temperature 30.5 °F 32.8 °F N/A
Avg. March High Temperature 42.6 °F 44.8 °F N/A
Avg. April High Temperature 59.2 °F 60.2 °F N/A
Avg. May High Temperature 71.6 °F 71.8 °F N/A
Avg. June High Temperature 80.7 °F 80.8 °F N/A
Avg. July High Temperature 85.9 °F 85.1 °F N/A
Avg. August High Temperature 83.6 °F 82.9 °F N/A
Avg. September High Temperature 74.9 °F 75.2 °F N/A
Avg. October High Temperature 62.6 °F 63.4 °F N/A
Avg. November High Temperature 43.8 °F 46.2 °F N/A
Avg. December High Temperature 30.1 °F 32.3 °F N/A

2010 Average Monthly Precipitation                        Lyon Iowa United States
Avg. Annual Precipitation 27.24"       35.23"      N/A
Avg. January Precipitation 0.54" 1.00" N/A
Avg. February Precipitation 0.56" 0.94" N/A
Avg. March Precipitation 1.91" 2.27" N/A
Avg. April Precipitation 2.70" 3.19" N/A
Avg. May Precipitation 3.31" 4.48" N/A
Avg. June Precipitation 4.31" 4.88" N/A
Avg. July Precipitation 3.48" 4.42" N/A
Avg. August Precipitation 3.63" 4.65" N/A
Avg. September Precipitation 2.52" 3.18" N/A
Avg. October Precipitation 1.93" 2.60" N/A
Avg. November Precipitation 1.62" 2.34" N/A
Avg. December Precipitation 0.72" 1.26" N/A

Annual Heating Degree Days (HDD): A form of Degree Day used to estimate energy requirements for heating. Typically, heating degree days are calculated as how much colder the mean temperature at a location is than 65°F on a given day. For example, if a location experiences a mean temperature of 55°F on a certain day, there were 10 HDD that day because 65 - 55 = 10, according to the National Weather Service.

Annual Cooling Degree Days (CDD): A form of Degree Day used to estimate energy requirements for air conditioning or refrigeration. Typically, cooling degree days are calculated as how much warmer the mean temperature at a location is than 65°F on a given day. For example, if a location experiences a mean temperature of 75°F on a certain day, there were 10 CDD that day because 75 - 65 = 10, according to the National Weather Service.

Mean Sky Cover: reflects the approximate amount that the sky is covered with clouds, sunrise to sunset on a scale of 0 to 10

Index score: (100 = National Average) for an area is compared to the national average of 100. A score of 200 indicates twice the national average, while 50 indicates half the national average. Note: A higher Weather Index score represents better overall weather (higher number good). A higher Hail, Hurricane or Tornado Index means the chance of that weather event is higher (higher number bad).