Indiana Climate And Weather Report – 7/18/2019

While the remnants of Hurricane Barry brought some much-needed precipitation to the state, the next few weeks look to be on the dry side.  Temperatures are also expected to be warmer than normal, so heat stress may become an issue for plants and animals.  The Midwestern Regional Climate Center’s (MRCC) Vegetation Impact Program (VIP) provides a modified stress degree-day (mSDD) tool ( for corn plants that accumulates degree-day units when temperatures exceed 86°F.  Modified SDD departures indicate most of Indiana to be near normal (Figure 1), however, excessive heat is in the forecast so mSDDs are expected to accumulate quickly.

Drought-like conditions are developing, particularly in northern Indiana.  While the excessive spring and early-summer rains saturated soils, the sudden dryness is causing some stress where plant roots were not able to deeply establish.  These changing weather conditions could leave plants more susceptible to external stresses from pests and diseases.

Fun Fact: Indiana experiences an average of 7-14 days with a Heat Index greater than or equal to 90°F and 3-7 days with a Heat Index greater than or equal to 100°F (source: MRCC Heat Index Climatologies;   So far in 2019, the Indianapolis weather station has recorded 14 days with a Heat Index over 90°F and 2 days with a Heat Index at or above 100°F.


Modified stress degree days (base 86F) for corn plants, departure from normal

Share This Article
It is the policy of the Purdue University that all persons have equal opportunity and access to its educational programs, services, activities, and facilities without regard to race, religion, color, sex, age, national origin or ancestry, marital status, parental status, sexual orientation, disability or status as a veteran. Purdue is an Affirmative Action Institution. This material may be available in alternative formats. 1-888-EXT-INFO Disclaimer: Reference to products in this publication is not intended to be an endorsement to the exclusion of others which may have similar uses. Any person using products listed in this publication assumes full responsibility for their use in accordance with current directions of the manufacturer.
Pest&Crop newsletter - Department of Entomology Purdue University 901 W. State St. West Lafayette, IN 47907

© 2022 Purdue University | An equal access/equal opportunity university | Copyright Complaints | Maintained by Pest&Crop newsletter

If you have trouble accessing this page because of a disability, please contact Pest&Crop newsletter at