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 (June 4 to 10, 2018) shows that areas close to the Saskatchewan border received significantly more precipitation and amounts decrease eastward in Manitoba. The greates amount of precipitation was received in the area surrounding Roblin (66mm), Inglis (58mm), Russell (63mm) and St. Lazare (56mm).
  2.  Total Accumulated Precipitation (May 01 to June 10, 2018) shows that more precipitation has occurred in along the Saskatchewan border and these amounts decrease eastward.   Many areas in the Interlake (e.g. Arborg, Teulon, Inwood and Moosehorn) and Central regions (e.g. Kane, Altona, Elie, Elm Creek and Portage) regions have received less than 45 mm since the beginning of May. 
  3.  Percent of Normal Accumulated precipitation (May 01 to June 10, 2018) relates accumulated precipitation since May 1 to a 30-year historical record. The map shows that the most areas in the Northwest region have received well above normal precipitation. Some areas in the Southwest region (Hamiota, McAuley, Virden) and Northwest region (Swan Valley, Roblin, Swan River) have received more than twice the normal precipitation. Most areas in other parts of agro-Manitoba have received less than the normal precipitation.
  4. Soil Moisture (June 10, 2018, 0-30 cm) shows that the majority of agro-Manitoba has adequate to wet soil moisture in the top 0-30 cm in relation to the soil saturation level (maximum recorded at that station). . The areas around Moosehorn, Findlay, Kane, Marchand and Menisino are very dry. Many of these areas received relatively lower accumulated precipitation. 
  5. Total Accumulated Growing Degree Days (base 5°C) from May 1 to June 10, 2018 shows that the south central and southwestern portion of the province continue to accumulate the highest growing degree days (max 473 GDD). GDD is a reflection of air temperature and most areas had > 30°C maximum air temperature last week. 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 1 to June 10, 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 all the locations are warmer than normal ranging from 110-144% of normal accumulated GDD.
  7. Total Accumulated Corn Heat Units from May 1 to June 10, 2018 shows that the south central and south west portions of the province received the greatest accumulated corn heat units (maximum of 748 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 1 to June 10, 2018 shows above normal CHU accumulation at all agro-MB regions (ranging between 112 – 138). The climate normal is based on historical record over a 30-year period.
  9. Total Accumulated Physiological Days (P-Days) from June 1 – 10, 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 is used for P-days because accumulation commences when about 50% of potato emergence. Other heat accumulation starts from seeding.
  10. Percent of Normal Accumulated P-Days from June 1 - 10, 2018 shows that compared to historical accumulation, the Central region (areas around Carman) have 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.  Current conditions at each weather station can be found here.

Additional geospatial viewers are available at 

Note:  Barometric Pressure Sensors will be added to all weather stations in 2018 and this will enable “forecast” data” and to possibly include this into modelling products.  You will also note that each weather station will have 4 soil moisture probes recording information (5, 20, 50 and 100 cm) in 2018.  This data will become available as weather stations are upgraded.  


Special Weather Events

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.
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