Weather History

This site began collecting data on 10/12/24

Last 24 hours

Omaha, NE Normals

Station Records

marquetteweather.com

Highest recorded temperature: 88.8 °F on May 10, 2025
Lowest recorded temperature: -11.5 °F on Feb 21, 2025
Total recorded temperature range: 100.3 °F

Highest recorded pressure: 30.76 inHg on Feb 19, 2025
Lowest recorded pressure: 28.92 inHg on Mar 14, 2025
Total recorded pressure range: 1.84 inHg

Highest recorded wind speed: 35.0 MPH on Mar 14, 2025

Wettest day on record: Apr 24, 2025 with 1.75 in of rain.

Sunniest day on record: Oct 13, 2024 with 16.1 hours of sunshine.

Official Weather Data

Forecast Accuracy

Check the accuracy of forecasted temperatures

* * * * *

Notes:

General

• The above data, with the exception of normals, were produced by a private weather station located near 132nd & Pacific in Omaha, NE. The station went online October 12, 2024.
• If you're seeking official weather data for Omaha, please visit NOAA NOWData.

Temperatures

• "NWS" averages are the sum of the daily high temperature & daily low temperature in whole degrees divided by 2. This is the National Weather Service method used for climatological summaries. All other fields labelled "Avg" contain integrated averages using one minute samples. "Avg" labelled summary columns contain weighted means (i.e. a partial hour/day/month counts less than a full one).
• CDD = Cooling Degree Days & HDD = Heating Degree Days. Degree days are calculated using daily NWS averages compared to a base value of 65°. For example, a day with an avg temperature of 67.7° will have 2.7 CDDs & 0 HDDs. A 33.2° avg temperature will produce 31.8 HDDs & 0 CDDs.
• In the daily & monthly history tables, "Wind Chill" appears only October through April. It is calculated when the temperature is 50 or below and maximum wind speed is greater than 3 mph. Otherwise, it equals the temperature. Likewise, "Heat Index" appears only May through September. It is calculated only when the temperature is 80 or above. Otherwise, it equals the temperature.
• Since our anemometer is at 8' AGL (rather than 33') we use the 10-minute average maximum wind speed to calculate wind chill which is a reasonable approximation of actual 10 meter sustained speeds (the parameter normally used to calculate wind chill). This has been verified via many comparisons between our max wind speeds and Millard Airport's sustained wind readings measured about 3 miles away.

Wind

• "Sustained" wind is the rolling 10 minute average sustained wind speed.
• "Wind Dir" is a scalar average of direction irrespective of speed. However, calm winds do not have a valid direction and are not included in the average.
• "Wind Run" uses the 10 minute wind average.
• "Low Sustained" & "Low Max" wind values are omitted from the yearly history table since every field equals 0.

Humidity / Dew Point

• Daily, monthly, and yearly history tables contain corrected humidities and dew points. A custom correction curve addresses an upper end dry bias and a mid-range wet bias inherent to the sensor. A third-party device accurate to within 2% humidity established the deltas used in the algorithm. The daily table contains up-to-date corrections for today. The monthly and yearly tables have corrections through yesterday (updated just after midnight each morning).

Precipitation

• "Liquid" precipitation in the winter is the amount of melted snow and/or ice.

Pressure

• Pressure is recorded in altimeter format. The home page, however, displays "Barometer" in MSLP format by default.

Solar

• UV index is a measurement of ultraviolet radiation at wavelengths of 290 to 390 nm. Scale is 0-16.
• The scale for solar radiation is 0 - 1800 Watts per meter squared. This measurement of the sun's energy (detected between 300 and 1100 nanometers wavelength) can approximate daylight cloud cover relative to clear days for a given time of year. It's also useful for determining solar electricity generation and aerosol levels (pollution, smoke, dust, ash, etc).
• The daily table summary footer for this tab omits "Min" since every value is always 0. Instead you'll see a "Daytime Avg" row displaying weighted averages of all hourly maximums, minimums, and averages between sunrise & sunset.
• In monthly & yearly tables, you'll see a "Daytime Avg" column containing daylight averages. The "Min" column will be entirely missing since every value would be 0.
• Total Radiation is measured in Megajoules (1,000,000 J) per meter squared.

Normals

• "Depart" in the Normals table refers to the average departure (or difference) between our weather station and the official Omaha average temperature.

Air Quality

• Each history table contains the Air Quality Index (AQI) and the adjusted AQI which appears on the Home page. AQI is based on a PM_2.5 particle count. The scale is 0-500. The higher the AQI, the worse the air quality. We use a Purple Air PA-II with dual laser particle counters which are polled every minute. For an explanation of AQI please tap on the linked headline "Air Quality" on the home page (in the Weather Conditions section at the top/left).
• The values found in the history tables under the column header "ADJ AQI" represent adjusted AQIs. We use the ALT cf=3 correction factor which is said to better estimate the particle count for our sensor as compared to federal air quality monitors. It does not leverage any problematic proprietary formulas such as CF_ATM or CF1.
• PM_2.5 concentrations (µg/m³) are corrected data using the ALT-CF3 algorithm mentioned earlier. They correspond to the adjusted (ADJ) AQI figures. Calculations are performed on 1 minute instantaneous samples (not 10-minute averages).