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. 

Special Maps

Agro-Manitoba Weather Extremes

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 481 KB)  (September 13 - 19, 2021)   shows that precipitation reported at weather stations across agro-Manitoba ranged from 0 to 11 mm this week. The weather stations in Lac du Bonnet, Pinnawa and Deloraine reported the highest precipitation with 11 mm over the past 7 days.
  • Total Accumulated Precipitation Map (PDF 492 KB) (May 01- September 19, 2021)  shows the total precipitation amount since May 1st.  Mountainside (339 mm) has reported the highest total accumulated precipitation since May 1st, followed by St. Lazare and Souris (337 mm).  Some areas throughout the Interlake, Eastern and Central regions have accumulated less than 200 mm of precipitation since May 1st. Brunkild (161 mm), Emerson (162 mm) and Dugald (169 mm) have reported the lowest total accumulated precipitation since May 1st.
  • Percent of Normal Accumulated Precipitation (PDF 488 KB) (May 01- September 19, 2021)  is based on historical records over a 30-year period. Mountainside (118%), Souris (112%), and Brandon (112%) are the top locations with the highest percent of normal precipitation since May 1st.  Although much of Western agro-Manitoba has accumulated upwards of 80% of normal seasonal precipitation compared to the 30-year average, the map does not account for the timing of the rainfall, much which has fallen very late in the growing season.
  • Total Accumulation of Growing Degree Days (PDF 479 KB) (May 01- September 19, 2021) shows the accumulated Growing Degree Days (GDD) for the growing season to date.  The highest total GDD accumulation has been observed near Morden (1,878), Winkler (1,867), and Deerwood (1,818). Birch River (1,234) has accumulated the lowest total GDD this growing season to date.
  • Percent Normal Accumulated Growing Degree Days (PDF 504 KB) (May 01 - September 19, 2021)        represents the variation of accumulated Growing Degree Days (GDD) from the historical record over a 30-year period. Most of agro-Manitoba has accumulated above average GDD compared to the historical average. Arborg (117%), Minnedosa (117%), and Moosehorn (115%) have accumulated the highest GDD this season to date.
  • Total Accumulated Corn Heat Units (PDF 483 KB) (May 01 - September 19, 2021) illustrates the total accumulated Corn Heat Units (CHU) for the growing season to date. Areas near Morden (2,925), Winkler (2,876) and St. Adolphe (2,857) have accumulated the most CHU since May 1st. Birch River (1,990) has accumulated the lowest total accumulated CHU. 
  • Percent Normal Accumulated Corn Heat Units (PDF 499 KB) (May 01- September 19, 2021)     represents the variation of accumulated Corn Heat Units (CHU) from the historical record over a 30-year period. Most of agro-Manitoba has accumulated above average CHU compared to the historical average accumulated CHU. Minnedosa has accumulated the highest percent normal accumulated CHU at 115% compared to the 30-year average. Birch River has accumulated the lowest percent normal accumulated CHU at 89%. 
  • Total Accumulated P-Days (PDF 495 KB) (June 1 - September 19, 2021)  represents the total accumulated physiological days for potatoes (P-days) since June 1, 2021.  P-days accumulation has a different start date (June 1) because accumulation commences at about 50% potato emergence. Other heat accumulation starts from May 1. St. Claude (854) Teulon (847) and Portage (846) have accumulated the highest P-days.  Birch River (638) has the lowest P-Day accumulation.
  • Percent of Normal  Accumulated P-Days (PDF 494 KB) (June 01 - September 19, 2021) represents the variation of accumulated physiological days for potatoes (P-days) from the historical record over a 30-year period.  Much of agro-Manitoba has accumulated above average P-Days compared to the historical average. Minnedosa (117%) and The Pas (113%) have the highest percent normal accumulation of P-days. Birch River (88%) has the lowest percent normal accumulation of P-days. 
  • Field Capacity-based Soil Moisture 0-30 cm ( PDF 481 KB) (September 19, 2021) shows a regional representation of soil moisture conditions relative to field capacity for the top 30 cm of the soil profile on September 19. Most of the Eastern, Central and Interlake regions of Agro-Manitoba are indicating dry surface soil moisture conditions (with localized areas of very dry to optimal), while much of the Southwest and Northwest regions are indicating dry to optimal moisture conditions (with localized areas or very dry to wet).
  •  Field Capacity-based Soil Moisture 0-120 cm (PDF 478 KB) (September 19, 2021) shows a regional representation of soil moisture conditions relative to the field capacity for the top 120 cm on September 19. Some areas across agro-Manitoba (the Interlake, Central and Eastern regions in particular) are indicating very dry to dry soil moisture conditions throughout the entire soil profile, however; much of agro-Manitoba is ranging from optimal to wet.

Soil Moisture Maps Descriptions:

Saturation-based soil moisture maps takes the estimated saturation point at each location and depth as 100%. At saturation, the entire soil pore is completely field with water and this condition occurs when the water table is high or in the spring when subsoil is frozen and top soil is saturated from snowmelt. Typical saturation values for clay ranges from 50 – 60% Volumetric Water Content (VWC) but saturation for sands range from 25 – 35% VWC. Soil moisture maps were previously based on saturation, however, the use of field-capacity-based moisture determination provides an improvement over saturation-based observation.

Field Capacity-based soil moisture maps takes the estimated saturation, field-capacity and wilting points at each location and depth into account. A soil is at field-capacity when excess soil moisture from drainage has stopped and the soil is holding to the maximum amount of moisture it can hold against the force of gravity. The maps are created by defining current values that are less than 25% of available water as very dry, between 25% - 50% of available water as dry, 50% of available water to field capacity at optimal, field capacity to 75% of saturation minus field capacity, as wet and above this level, very wet. Available water is soil moisture held between field capacity and wilting point.

 
The information on the maps provides regional representation. Field-specific conditions may be different from the information provided on the maps.

 

Other links of interest to access current weather conditions recorded at each station:
 
 

Seasonal Maps

Last Spring Frost

Monthly Precipitation 2020

         

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.