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LAF Dewpoint History


Chicago WX

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Every maximum 75º+ dew point day, since 1973. Anything 84º or higher is to be taken with a great degree of caution. As well, I have stricken from the record any days that had a "unrealistic" max 75º+ dew point.

 

Keep in mind there are missing days...but for this set, there have been 511 days since 1973 with a max dewpoint of 75 or greater.

 

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Nice work Tim.  As bad as the summer of 2012 was from a heat standpoint, at least there were only 2 days with a dewpoint of 75F+.

I'm surprised that the avg per year is 12.6.  Without knowing any better, I would have guessed 6 to 8.

 

Also, one of my good friends got married in the Chicago suburbs on 7/30/1999.  That was an unbelievably muggy day...I think the dewpoint at ORD hit the low 80s, with a temp in the mid-upper 90s.

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Nice work Tim.  As bad as the summer of 2012 was from a heat standpoint, at least there were only 2 days with a dewpoint of 75F+.

I'm surprised that the avg per year is 12.6.  Without knowing any better, I would have guessed 6 to 8.

 

Also, one of my good friends got married in the Chicago suburbs on 7/30/1999.  That was an unbelievably muggy day...I think the dewpoint at ORD hit the low 80s, with a temp in the mid-upper 90s.

 

Thanks.

 

Well, LAF and GUS (Peru/Grissom) are the dew point kings in Indiana...so take the readings at both for whatever they're worth.

 

7/30/1999 had a peak dew point of 82º at ORD at 9:00am...and 100º/69º from 3:00-4:00pm. LAF had 99º/79º from 2:00-4:00pm, for a HI of 118º. 

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Longest streaks of consecutive days with a maximum dewpoint of 75º or higher.

 

13 days

July 19-31, 1999: 77, 76, 77, 78, 76, 76, 76, 76, 75, 75, 78, 80, 77

 

12 days

August 9-20, 1995: 79, 77, 76, 78, 78, 79, 78, 79, 77, 77, 75, 75

 

9 days

July 17-25, 2001: 76, 76, 76, 75, 76, 81, 78, 80, 78

 

8 days

August 23-30, 1993: 77, 75, 76, 76, 76, 76, 75, 75

July 17-24, 2011: 76, 77, 81, 80, 78, 78, 79, 77

 

7 days

August 4-10, 1980: 75, 75, 79, 78, 76, 77, 79

August 9-15, 2010: 81, 78, 78, 75, 76, 75, 76

 

6 days

August 3-8, 1982: 75, 79, 76, 76, 77, 76

July 15-20, 1986: 76, 76, 77, 76, 76, 75

August 13-18, 1988: 75, 78, 77, 79, 76, 75

July 28-August 2, 2006: 75, 79, 76, 78, 77, 75

 

5 days

August 5-9, 1979: 79, 77, 77, 76, 77

August 17-21, 1980: 79, 78, 77, 80, 76

August 18-22, 1983: 79, 79, 78, 77, 75

July 24-28, 1993: 76, 79, 77, 79, 76

June 16-20, 1994: 76, 76, 75, 76, 76

July 4-8, 1994: 75, 79, 78, 77, 77

June 24-28, 1998: 75, 75, 76, 79, 77

July 2-6, 1999: 75, 76, 76, 78, 78

 

4 days

July 12-15, 1977: 79, 75, 78, 77

July 18-21, 1977: 76, 76, 76, 75

September 17-20, 1978: 77, 76, 75, 75

July 16-19, 1982: 75, 78, 76, 78

July 18-21, 1983: 75, 76, 77, 76

July 28-31, 1983: 78, 76, 75, 77 

August 6-9, 1984: 75, 78, 79, 76

July 13-16, 1995: 79, 79, 78, 76

July 19-22, 1998: 77, 78, 79, 75

July 31-August 3, 2001: 76, 75, 77, 75

August 25-28, 2004: 76, 76, 79, 75

July 23-26, 2005: 75, 81, 80, 79

July 21-24, 2010: 75, 80, 80, 79 

 

3 days

August 22-24, 1975: 76, 80, 75

July 9-11, 1976: 79, 75, 75

September 12-14, 1978: 79, 75, 75

July 10-12, 1980: 77, 77, 79

July 14-16, 1980: 75, 78, 75

July 31-August 2, 1980: 79, 75, 75

July 25-27, 1982: 75, 77, 77

August 26-28, 1983: 76, 75, 75

August 28-30, 1984: 77, 78, 77

July 9-11, 1987: 75, 75, 75

August 1-3, 1987: 80, 79, 75

August 1-3, 1988: 77, 76, 75

August 9-11, 1988: 79, 78, 76

May 30-June 1, 1989: 76, 77, 76

August 18-20, 1990: 78, 76, 75

July 2-4, 1993: 75, 76, 76

July 17-19, 1996: 75, 81, 77

August 5-7, 1996: 75, 75, 77

July 26-28, 1997: 84*, 86*, 75

July 7-9, 2001: 80, 77, 76

July 27-29, 2002: 78, 76, 77

August 3-5, 2002: 78, 78, 77

August 14-16, 2003: 77, 75, 75

July 16-18, 2005: 76, 76, 79

July 26-28, 2011: 75, 77, 76

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Remember this from not too long ago? August 3-4, 2010

7:54 PM 90.0 °F  109.3 °F  81.0 °F  75% 29.89 in  7.0 mi  North 3.5 mph  -  N/A    Clear 
8:54 PM 87.1 °F  106.2 °F  82.0 °F  85% 29.88 in  5.0 mi  Calm Calm -  N/A    Haze 
9:54 PM 84.9 °F  101.8 °F  82.0 °F  91% 29.88 in  6.0 mi  Calm Calm -  N/A    Mostly Cloudy 
10:54 PM 84.9 °F  101.8 °F  82.0 °F  91% 29.87 in  6.0 mi  Calm Calm -  N/A    Clear 
11:54 PM 84.0 °F  99.9 °F  82.0 °F  94% 29.86 in  6.0 mi  Calm Calm -  N/A    Clear 
12:54 AM 82.9 °F  95.9 °F  81.0 °F  94% 29.86 in  6.0 mi  Calm Calm -  N/A    Clear 
1:54 AM 82.0 °F  93.7 °F  81.0 °F  97% 29.87 in  5.0 mi  Calm Calm -  N/A    Clear 
2:54 AM 81.0 °F  89.9 °F  80.1 °F  97% 29.86 in  5.0 mi  Calm Calm -  N/A    Clear 
3:54 AM 81.0 °F  89.9 °F  80.1 °F  97% 29.85 in  6.0 mi  WSW 3.5 mph  -  N/A    Clear 
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Remember this from not too long ago? August 3-4, 2010

 

7:54 PM 90.0 °F  109.3 °F  81.0 °F  75% 29.89 in  7.0 mi  North 3.5 mph  -  N/A    Clear 
8:54 PM 87.1 °F  106.2 °F  82.0 °F  85% 29.88 in  5.0 mi  Calm Calm -  N/A    Haze 
9:54 PM 84.9 °F  101.8 °F  82.0 °F  91% 29.88 in  6.0 mi  Calm Calm -  N/A    Mostly Cloudy 
10:54 PM 84.9 °F  101.8 °F  82.0 °F  91% 29.87 in  6.0 mi  Calm Calm -  N/A    Clear 
11:54 PM 84.0 °F  99.9 °F  82.0 °F  94% 29.86 in  6.0 mi  Calm Calm -  N/A    Clear 
12:54 AM 82.9 °F  95.9 °F  81.0 °F  94% 29.86 in  6.0 mi  Calm Calm -  N/A    Clear 
1:54 AM 82.0 °F  93.7 °F  81.0 °F  97% 29.87 in  5.0 mi  Calm Calm -  N/A    Clear 
2:54 AM 81.0 °F  89.9 °F  80.1 °F  97% 29.86 in  5.0 mi  Calm Calm -  N/A    Clear 
3:54 AM 81.0 °F  89.9 °F  80.1 °F  97% 29.85 in  6.0 mi  WSW 3.5 mph  -  N/A    Clear 

 

How could I forget? :lol:

 

BTW, from my research...the summer of 2010 had the most number of 70º+ max dewpoint days with 58. Summer 2009 had the fewest with 19. 

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How could I forget? :lol:

BTW, from my research...the summer of 2010 had the most number of 70º+ max dewpoint days with 58. Summer 2009 had the fewest with 19.

From one extreme to the next.

I wouldn't be surprised if August 3-4 is our longest hourly streak with 80+ dewpoints.

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In order of highest to lowest 80º maximum dewpoint temperature (second chart in this post). The 9 consecutive hourly observations of August 3-4, 2010 is indeed the longest. July 13, 1985 is the next closest, but had a LAF failure that night...so who knows?

 

June 17, 1990: 4 hourly observations (3:00pm to 6:00pm)

July 7, 1980: 1 hourly observation (3:00pm)

July 27, 1997: 3 hourly observations (11:00am to 1:00pm)

July 26, 1997: 1 hourly observation (2:00pm)

July 6, 1989: 3 hourly observations (12:00pm to 2:00pm)*

August 3-4, 2010: 9 hourly observations (8:00pm to 4:00am)

July 11, 2011: 4 hourly observations (5:00pm to 8:00pm)

July 8, 1980: 1 hourly observation (1:00am)

July 18, 1996: 1 hourly observation (4:00pm)

August 16, 1997: 1 hourly observation (3:00am)

July 22, 2001: 2 hourly observations (7:00pm to 8:00pm)

July 21, 2004: 3 hourly observations (4:00pm to 6:00pm)

July 24, 2005: 2 and 4 hourly observations (1:00pm to 4:00pm and 10:00pm to 11:00pm)

July 28, 2010: 1 hourly observation (intra hour at 8:15pm and 8:31pm)

August 4, 2010: 1 and 1 hourly observations (9:00am and 6:00pm)

August 9, 2010: 1 hourly observation (intra hour at 8:08pm)

July 19, 2011: 1 hourly observation (intra hour at 11:01am)

August 23, 1975: 1 hourly observation (11:00am)

August 20, 1980: 1, 2, and 2 hourly observations (1:00pm to 2:00pm, 4:00pm, and 6:00pm to 7:00pm)

July 13, 1985: 7 hourly observations (4:00pm to 10:00pm)**

August 1, 1987: 2 hourly observations (6:00pm to 7:00pm)

July 30, 1999: 2 hourly observations (9:00pm to 10:00pm)

July 7, 2001: 1 hourly observation (8:00pm)

July 24, 2001: 1 hourly observation (8:00pm)

July 25, 2005: 1 and 1 hourly observations (12:00pm and 2:00pm)

July 22, 2010: 2 hourly observations (7:00pm to 8:00pm)

July 23, 2010: 2 hourly observations (8:00pm to 9:00pm)

July 20, 2011: 2 hourly observations (1:00pm to 2:00pm) 

 

*dewpoint dropped to 32º at 3:00pm through 9:00pm

**dewpoint dropped to 32º at 11:00pm through 12:00am

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Longest streaks of consecutive days with a 70º+ maximum dewpoint.

 

30 days

July 22-August 20, 1995

 

19 days

July 16-August 3, 2011

 

18 days

July 4-21, 1977

 

16 days

July 5-20, 1986

July 17-August 1, 1999

 

15 days

August 17-31, 1983

July 12-26, 2005

July 11-25, 2010

 

13 days

July 2-14, 1993

July 16-28, 1997

 

12 days

August 4-15, 1980

August 8-19, 1988

 

11 days

July 14-24, 1983

August 1-11, 1984

July 26-August 5, 2002

July 11-21, 2006

 

10 days

August 9-18, 1974

July 7-16, 1980

August 11-20, 1993

June 20-29, 1998

July 17-26, 2001

June 8-17, 2004

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