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 482 KB) from July 01 to July 14, 2019 indicates that the areas around Brunkild (Central), Mountainside (Southwest) as well as the southeast region, close to the US border received the highest amount of one-week accumulated rainfall since the start of the season. Most of the precipitation was received during the event that occurred from Monday evening till Wednesday morning. Brunkild received a total of 153 mm, Zhoda (147 mm), Mountainside (137 mm), Rosa (131 mm) and Marchand (130 mm). The Northwest region had the lowest amount of precipitation which ranged from 4 mm – 20 mm. The Interlake and north parts of the eastern and central regions received between 40 - 60 mm.
  • Total Accumulated Precipitation Map (PDF 486 KB) from May 01 to July 14, 2019 shows that some areas in the Southwest  (around Ninette, Souris, Wawanesa, Mountainside, Minto and Boissevain); Central (Brunkild) and Southeast (Steinbach, Marchand, Rosa, Zhoda, Gardenton and Menisino) have received over 200 mm of precipitation since May 1. The Central region is mainly between 140 – 180 mm. There is reduced accumulate precipitation in the Northwest and Interlake regions as well as Lakeland and Gladstone in the Central region with low precipitation accumulation between 62 – 120 mm.
  • Percent of Normal Accumulated Precipitation Map (PDF 489 KB) from May 01 to July 14, 2019 is based on historical record over a 30-year period. Last week’s precipitation in many areas has increased the percent of normal accumulated precipitation. Only six locations had above normal accumulated precipitation last week. However, this week, there are 28 locations mainly in the southwest and southeast regions. The top three are Mountainside (167%), Brunkild (136%) and Wawanesa (134%). The Northwest and Interlake regions are dry with less than 60% of normal precipitation. All the regions tend to have higher precipitation in the south and the amount reduces northward.
  •  Soil Moisture Top 30 cm Map (PDF 468 KB) from July 14, 2019 in the top 0-30 cm shows that most areas are at wet and optimal soil moisture condition. The north areas of the Interlake and areas around Drifting River, Rorketon, Alonsa and Gladstone are dry in the top 0-30 cm. The 0 – 120 cm Soil Moisture Map (467 KB) shows that soil moisture is mostly at optimal level across agro-Manitoba with an increase in the areas showing wet when compared to last week. Dry condition persists at Virden, Forrest, Shilo, Pipelake, Eden, Pierson, Winkler, Gladstone, Gardenton, Menisino, Narcisse and Moosehorn. 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 487 KB) from May 01 to July 14, 2019 shows that the southern areas of the Central region received the greatest total accumulated growing degree days (720 – 784 GDD) with Winkler (784 units), Altona (783 units) and Morden (772 units) as the top three locations. 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 505 KB)  from May 01 to July 14, 2019 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 is generally cooler than normal at all locations, up to a maximum of 98% at Minnedosa. Areas south of the Riding Mountain National Park as well as Pipe Lake, Grandview, San Clara, Reedy Creek and Minitonas (northwest region); Boissevain (southwest region); Manitou, Snowflake and Windygates (central region); Rosa, Gardenton and Marchand (southeast) are between 78 - 86% of normal GDD heat accumulation.
  • Total Accumulated Corn Heat Unit Map (PDF 486 KB) from May 01 to July 14, 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 (1,210 – 1,281 CHU). 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.
  • Percent of Normal Accumulated Corn Heat Unit Map (PDF 498 KB) from May 01 to July 14, 2019 reflects the increasing heat accumulation compared to the slow start in May. Although all locations are still at or below normal, CHU accumulation at all agro-MB regions, especially, at Alexander, Minnedosa and Carberry are the highest at 100% of normal CHU accumulation for their respective area. The climate normal is based on historical record over a 30-year period.
  • Total Accumulated Physiological Days (P-Days) Map (PDF 501 KB) from June 01 to July 14, 2019 shows that the top three locations with the highest amount of heat accumulation  occurred at St. Adolphe (340 units), Dand (338 units) and  Portage la Prairie (337 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 498 KB) from June 01 to July 07, 2019 shows that compared to historical accumulation, areas around Minnedosa have received the highest percentage of normal P-days heat accumulation at 11% above normal. 85 of the 116 locations monitored were slightly above normal P-day accumulation. The main areas with less than 98% of normal accumulation in the Central region are Manitou, Snowflake and Windygates.

Special Report: As at 8 am on July 15, precipitation information since midnight showed that areas in the Northwest region have received about 10 mm, St. Claude (Central), Treherne (Central), Holland (Central) and St. Lazare (Southwest). The precipitation event is moving eastward and about 5 – 10 mm of rain expected in the southeast region.

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

 
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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.