September 2012 will enter the record books as the 2nd driest September ever recorded in Winnipeg since records began in 1872. The monthly total of only 4.0 mm was less than 5% of normal for September (average = 52 mm) and was second driest only to September 1948 at 1.3 mm. The dry weather has persisted for 6 weeks now, with the last appreciable rainfall back on August 15th when 9 mm was recorded at YWG airport. The dry weather comes on the heels of a dry summer that saw only about half our normal rainfall. This has left soil moisture conditions bone dry, and significant rainfall of 50 mm or more is desperately needed to replenish soil moisture levels. September was Winnipeg's 4th consecutive drier than normal month, with rainfall deficit now standing at 153 mm since June 1st.
Top 5 driest Septembers on record (Winnipeg) - since 1872
1. 1948 ..... 1.3 mm
2. 2012 ..... 4.0 mm
3. 1938 ..... 6.1 mm
4. 1897 ..... 8.6 mm
5. 1976 ..... 9.9 mm
September 2012 also finished slightly above normal thanks to some warm weather at month's end that boosted the monthly average to 12.6C, or about 0.3C above normal. That extends the monthly above normal streak to an unprecedented 15 straight months in Winnipeg, going back to June 2011.