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 457 KB)  (October 18 - 24, 2021)   shows that precipitation reported at weather stations across agro-Manitoba was not significant this past week. The weather stations in Reedy Creek, Arborg and Waskada reported about 1 mm of precipitation; however most sites reported no precipitation over the past 7 days.
  • Total Accumulated Precipitation Map (PDF 496 KB) (May 01- October 24, 2021)  shows the total precipitation amount since May 1st.  Gretna (440 mm) has reported the highest total accumulated precipitation since May 1st, followed by Altona (385 mm) and Mountainside (382 mm).  Lakeland (204 mm), Stonewall (205 mm) and Brunkild (205 mm) have reported the lowest total accumulated precipitation since May 1st.
  • Percent of Normal Accumulated Precipitation (PDF 484 KB) (May 01- October 24, 2021)  is based on historical records over a 30-year period. Gretna (122%), Mountainside (117%), and Souris (108%) are the locations with the highest percent of normal precipitation since May 1st.  Brunkild (54%), Menisino (54%) and Dugald (55%) have reported the lowest percent of normal precipitation this season to date.
  • Total Accumulation of Growing Degree Days (PDF 481 KB) (May 01- October 24, 2021) shows the accumulated Growing Degree Days (GDD) for the growing season to date.  The highest total GDD accumulation has been observed near Morden (2,154), Winkler (2,135), and Altona (2,090). Birch River (1,406) has accumulated the lowest total GDD this growing season to date.
  • Percent Normal Accumulated Growing Degree Days (PDF 499 KB) (May 01 - October 24, 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. Minnedosa (125%), Arborg (125%), and St. Pierre (124%) have accumulated the highest GDD this season to date.
  • Total Accumulated Corn Heat Units (PDF 484 KB) (May 01 - October 24, 2021) illustrates the total accumulated Corn Heat Units (CHU) for the growing season to date. Areas near Morden (3,355), Altona (3,294), and Winkler (3,293) have accumulated the most CHU since May 1st. Birch River (2,314) has accumulated the lowest total accumulated CHU. 
  • Percent Normal Accumulated Corn Heat Units (PDF 500 KB) (May 01- October 24, 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. At 122%, Minnedosa has accumulated the highest percent normal accumulated CHU compared to the 30-year average. Birch River has accumulated the lowest percent normal accumulated CHU at 96%. 
  • Total Accumulated P-Days (PDF 490 KB) (June 1 - October 24, 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 (1,009) Selkirk (1007) and Altona (1002) have accumulated the highest P-days.  Birch River (754) has the lowest P-Day accumulation.
  • Percent of Normal  Accumulated P-Days (PDF 498 KB) (June 01 - October 24, 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 (124%) The Pas (121%) and Teulon (118%) have the highest percent normal accumulation of P-days. Birch River (96%) has the lowest percent normal accumulation of P-days. 
  • Field Capacity-based Soil Moisture 0-30 cm ( PDF 467 KB) (October 24, 2021) shows a regional representation of soil moisture conditions relative to field capacity for the top 30 cm of the soil profile on October 24. Though various sites across agro-Manitoba are reporting very dry to dry surface soil moisture conditions, much of agro-Manitoba is reporting optimal conditions.
  •  Field Capacity-based Soil Moisture 0-120 cm (PDF 471 KB) (October 24, 2021) shows a regional representation of soil moisture conditions relative to the field capacity for the top 120 cm of the soil profile on October 24. With minimal rainfall last week, several locations in the Interlake, Eastern and Northwest regions are reporting very dry to dry conditions, while most of the Southwest region remains in the optimal range of moisture conditions in the top 120cm of the soil profile.

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

First Fall Frost

Monthly Precipitation 2021

         

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.