Weather Conditions and Reports

From month to month, Manitoba's ag weather program retrieves data every 15 minutes from equipment across the province. About 109 stations monitor air temperature, relative humidity, rainfall, wind speed/wind direction and soil temperature.

In addition to regular weather and soil reports, producers can access more specialized tools during the growing season. These tools include disease and crop condition reports, which helps producers determine the safest and most effective times to spray.

Weather reports are best viewed using Internet Explorer.


Latest weather and conditions

  1. Seven-Day Accumulated Precipitation (July 09 to July 15, 2018) shows the amount of precipitation received across agro-Manitoba last week. The greatest precipitation occurred in Gimli and the surrounding areas, Melita, Wawanesa, St. Claude, Snowflake and Brunkild.
  2. Total Accumulated Precipitation (May 01 to July 15, 2018) shows that Rorketon south to Reedy Creek, the Interlake region and select locations throughout Manitoba have received low total precipitation since May 1. The early June storm in areas in the Northwest region close to the Saskatchewan border continues to boost the total accumulated precipitation in those areas (> 180 mm). The majority of agro-Manitoba has received between 90 – 150 mm of precipitation. 
  3. Percent of Normal Accumulated precipitation (May 01 to July 15, 2018) relates accumulated precipitation since May 1, 2018 to a 30-year historical record. Areas in the Northwest and Southwest regions along the Saskatchewan border received above normal precipitation. Some areas in the central/eastern regions (Altona, Gretna, Dominion City,  etc.) and many areas north of Lake Manitoba (Rorketon east to Moosehorn) have received less than 70% of the expected amount of precipitation since May 01.
  4. Soil Moisture (July 15, 2018, top 0-30 cm) shows that the areas that received significant precipitation are very wet (Swan , San Clara).  In general, surface soil moisture conditions mostly range from adequate to dry. 
  5. Total Accumulated Growing Degree Days (base 5°C) from May 01 to July 15, 2018 shows that the central part of the province continue to accumulate the highest growing degree days (max 1,044 GDD). Growing degree days are calculated by averaging daily maximum-minimum temperatures and subtracting 5°C which assumes that growth does not occur below this temperature. Heat accumulation generally decreases from south to north.
  6. Percent of Normal Accumulated Growing Degree Days from May 01 to July 15 2018 shows the range in growing degree days for agro-Manitoba.  The climate normal is based on historical record over a 30-year period. The map shows that agro Manitoba has greater growing degree days ranging from 103-135% of normal accumulated GDD. 
  7. Total Accumulated Corn Heat Units from May 01 to July 15, 2018 shows that the central portions of the province received the greatest accumulated corn heat units (maximum of 1637 units). Heat accumulation generally decreases from south to north. Corn heats units are similar to growing degree days given they both assume that growth increases with increasing temperature but they are calculated differently.  Corn heat units calculates the day and night temperatures separately.  It is assumed that no growth occurs with night temperatures below 4.4°C or day temperatures below 10°C . Maximum growth occurs at 30°C and decreases with higher temperatures. 
  8. Percent of Normal Accumulated Corn Heat Units from May 01 to July 15, 2018 shows above normal CHU accumulation at all agro-MB regions (ranging between 105 – 132%). The climate normal is based on historical record over a 30-year period.
  9. Total Accumulated Physiological Days (P-Days) from June 01 to July 15, 2018 shows greater heat accumulation in the central and southwest regions of agro-Manitoba. Similar to GDD and CHU, the P-day provides an indication of heat accumulation. However, it uses 7°C as the minimum air temperature for growth and development; rapid growth at 21°C and maximum growth at 30°C. P-Day is mostly used for Potato heat accumulation. A different start date (June 01) is used for P-days because accumulation commences at about 50% potato emergence. Other heat accumulation starts from seeding.
  10. Percent of Normal Accumulated P-Days from June 01 to July 15, 2018 shows that the western region has received the highest percentage of normal P-days heat accumulation. 
  11. The average daily soil temperature across agro-Manitoba can be found at (   
  12. The Manitoba Weather Report shows weather information by individual weather station.  This information is also available here for each weather station. Additional geospatial viewers are available at

All the heat indicators (GDD, CHU and P-Days) show that this growing season has been warmer than normal.

Barometric Pressure Sensors are currently being added to all weather stations this season and this will enable “forecast” data” to be included into modelling products. 

Note that each weather station will have 4 soil moisture probes recording information (5, 20, 50 and 100 cm) shortly.  This data will become available as weather stations are upgraded.

Weekly Maps

(Higher resolution is available on request)

Crop Weather Report



Subscribe to the receive weekly distribution of seasonal reports and maps by email.


Seasonal maps

Visit the Seasonal Reports page for information on progress in seeding and crop establishment, crop development, pest activity including weeds, insects and disease, harvest progress, crop yields and grades, fall field work progress, and status of winter cereal crop seeding and establishment. Information on haying progress and estimated yields, as well as pasture conditions is included.