Weather Conditions and Reports

Manitoba's ag weather program measures and records data year round from over 100 weather stations across agro-Manitoba. The stations monitor air temperature, relative humidity, barometric pressure, precipitation, wind speed and direction, solar radiation, soil temperature, and soil moisture. The latest weather conditions from each station are made available every 15 minutes throughout the growing season and every hour during the winter months. 


Weekly Crop Weather Report and Maps

The latest weather report and maps are made available every Monday year round. Subscribe to receive a weekly distribution of seasonal reports and maps by email.

 Higher resolution maps are available on request.

  • Seven Day Accumulated Precipitation Map (PDF 484 KB) from  – September – September 15, 2019 indicates that areas around Winnipeg received the highest amount of precipitation last week. The top three locations with the highest amount of rainfall are Stonewall (49 mm), Selkirk (42.8 mm) and Winkler (41.1 mm). The eastern parts of the Northwest region as well as the northern areas of the Interlake region received less than 5 mm of rain.
  • Total Accumulated Precipitation Map (PDF 487 KB) from May 01 to  September 15, 2019 , 2019 shows that some areas in the Southwest (around Ninette, Mountainside, Minto and Wawanesa); Central (Brunkild) and Southeast (Marchand, Zhoda, Gardenton and Menisino) have received over 350 mm of precipitation since May 1. Zhoda is the only location with over 400 mm of accumulated precipitation. The Interlake, Northwest region around the Riding Mountain National Park as well as Lakeland in the Central region have received the lowest total accumulated precipitation between 162 and 200 mm.
  • Percent of Normal Accumulated Precipitation Map (PDF 491 KB) from May 01 to September 15, 2019 is based on historical record over a 30-year period. Many locations in the southwest region and few locations in the eastern region are above normal accumulated precipitation. The top three locations with above percent of normal accumulated precipitation are Mountainside (137%), Rivers (129%) and Wawanesa (121%). Many areas in the Northwest and Interlake regions are mostly between 60 – 70%.  Arborg, Narcisse, Inwood, Fisherton, Fisher Branch, Eriksdale, Laurier and Lakeland have received between 53 – 60% of normal accumulated precipitation.
  •  Soil Moisture Top 30 cm Map (PDF 465 KB) and 0 – 120 cm Soil Moisture Map (464 KB) from September 16, 2019 in the top 0-30 cm shows the impact of recent precipitation events. Dry soil moisture condition at the surface persists at few locations in the Interlake such as Moosehorn, Eriksdale, Poplarfield, Narcisse and Inwood as well as at few locations in the northwest region. The central and eastern regions are mostly at wet to optimal soil moisture. Sub-surface soil moisture condition remains at optimal level at most locations across agro-Manitoba, except at some locations, especially, the Interlake region. Soil moisture levels are rated as follows: < 20% Very Dry, 20 – 40% Dry; 40 – 70% Optimal; 70 – 90% Wet and >90% Very Wet in relation to the soil saturation level (maximum recorded at that station).
  • Total Accumulated Growing Degree Day Map - Base 5°C (PDF 489 KB) from May 01 to September 15, 2019 shows that the southern areas of the Central region received the greatest total accumulated growing degree-days (1,500 – 1,602 GDD) with Winkler (1,602 units), Morden (1,588 units) and Altona (1,587 units) as the top three locations. Areas south and west of the Riding Mountain National park and Duck Mountain Provincial park have the lowest GDD accumulation. Heat accumulation generally decreases from south to north. 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.
  • Percent of Normal Accumulated Growing Degree Day Map (PDF 501 KB)  from May 01 to September 15, 2019 shows the range in growing degree days for agro-Manitoba compared to historical average.  The climate normal is based on historical record over a 30-year period. Most of agro-Manitoba remains generally cooler than normal, especially areas south and west of the Riding/Duck Mountain Parks as well as some areas in the southwest, central and eastern regions which are between 79 - 88% of normal GDD heat accumulation. Arborg and Minnedosa are the only locations at 100% of normal GDD accumulation.
  • Total Accumulated Corn Heat Unit Map (PDF 485 KB) from May 01 to September 15, 2019 shows that similar to the GDD, the southern areas of the Central region close to the Red River have received the greatest total accumulated corn heat units (2,450 – 2,581 CHU). Heat accumulation generally decreases from south to north. Corn heat 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.
  • Percent of Normal Accumulated Corn Heat Unit Map (PDF 496 KB) from May 01 to September 15, 2019 shows that only 16 of the 111 locations were at or slightly above normal (100 – 102%) of normal CHU. These are locations around the Dauphin Lake as well as locations around Brandon and Carman. The areas with less than 92% of normal CHU are similar to the areas with the lowest percent of normal GDD. The climate normal is based on historical record over a 30-year period.
  • Total Accumulated Physiological Days (P-Days) Map (PDF 490 KB) from June 01 to  September 15, 2019 shows that the top three locations with the highest amount of heat accumulation  occurred at St. Claude (811 units), Morden (808 units) and Portage la Prairie (806 units). 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.
  • Percent of Normal Accumulated P-Days Map (PDF 497 KB) from  June 01 to September 15, 2019  shows that compared to historical accumulation, areas around Minnedosa have received the highest percentage of normal P-days heat accumulation at 8% above normal. Most locations have above normal percent of accumulated P-day. However, the Interlake; areas south and east of the Riding Mountain park as well as the central region close to the US border have accumulated less than 100% of normal P-days.
Other links of interest to access current weather conditions recorded at each station:
-          Current Weather Condition by Station.
-          Interactive Map of all weather stations with latest hourly weather information.

Seasonal Maps

Seasonal Reports

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.