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Sioux City, Iowa

January 2006 was a record warm month for Sioux City, Iowa.  Below is a graph showing the daily maximum and minimum temperature for Sioux City.  Also shown is the normal high and low temperature for Sioux City.  There were 8 days where the observed low temperature was warmer than the normal high temperature for the date. 

Click on image to see table of values shown in graph.

The warmest temperature of the month was 64 degrees on January 15 which was a record for the day.  This also ties for the 5th warmest day ever to occur in January temperature in Sioux City.  In addition, a high temperature of 62 on January 26 is tied for the 13th warmest January temperature.

The average January temperature in Sioux City was 33.5 degrees.  This set a record for the warmest average temperature in January and broke the old record by 2.0 degrees.  The graph below shows the top 10 warmest Januarys in Sioux City.

Red indicates 2006 average and yellow is normal.  Click on image to see table of values shown in graph.

Sioux City also set a record for the warmest average minimum temperature in January.  The average minimum temperature was 23.1 degrees and broke the old record of 21.7 degrees set in 1931. January 2006 was 14.6 degrees above the normal low of 8.5 degrees in January.  The average temperature for January 2006 was comparable to the normal low temperature for March 8.

Red indicates 2006 average and yellow is normal.  Click on image to see table of values shown in graph.

Sioux City set a record for the warmest average maximum temperature in January.  The average maximum temperature of 43.8 degrees broke the old record of 42.4 degrees set in 1990.  An average temperature of 38.2 degrees is 15.1 degrees above normal and would be the normal temperature on March 9.

Red indicates 2006 and yellow is normal.  Click on image to see table of values shown in graph.

There are several other interesting facts associated with January 2006.  This was the ninth January on record where the low temperature did not fall below zero.   Normally, there are 8 days in January when the low temperature is below zero.

Dark blue indicates 2006 and grey is normal.  Click on image to see table of values shown in graph.

This was the first January ever recorded when the daily minimum temperature was not less than 10 degrees.  In 1990, 1992, and 1921, the minimum temperature fell below 10 degrees twice.  Normally, Sioux City has a minimum temperature of 10 degrees on 14 days.

Dark blue indicates 2006 and grey is normal.  Click on image to see table of values shown in graph.

Sioux City had the third-most days in recorded history when the low temperature remained above 19 degrees.  For 21 of the 31 days in January, the low temperature was at least 20 degrees.  This is 2 fewer than in 1919 when 23 days had a minimum temperature of at least 20 degrees.  Sioux City normally has 8 days in January with a minimum temperature of at least 20 degrees.

Dark blue indicates 2006 and grey is normal.  Click on image to see table of values shown in graph.

Sioux City also saw the most number of days in January above freezing.  There were 29 days above freezing in January.  This is one more than the previous record of 28 set in 1990.  On average, there are 13 days in January when the temperature rises above freezing.

Dark blue indicates 2006 and grey is normal.  Click on image to see table of values shown in graph.

Table 1. Daily observed high and low temperature and normal high and low
temperature for January 2006 in Sioux City, Iowa.

Date	Observed High	Observed Low	Normal Low	Normal High
January 1	35	29	9	29
January 2	34	31	8	28
January 3	38	30	8	28
January 4	45	31	8	28
January 5	32	22	8	28
January 6	48	16	8	28
January 7	47	25	8	28
January 8	35	30	8	28
January 9	35	24	8	28
January 10	43	20	8	28
January 11	55	22	8	28
January 12	47	31	8	28
January 13	36	19	8	28
January 14	51	18	8	28
January 15	64	27	8	28
January 16	41	27	8	28
January 17	31	11	8	28
January 18	48	11	8	29
January 19	39	29	8	29
January 20	34	24	8	29
January 21	48	18	8	29
January 22	34	14	9	29
January 23	49	13	9	29
January 24	46	16	9	29
January 25	50	15	9	29
January 26	62	25	9	30
January 27	59	42	9	30
January 28	48	43	10	30
January 29	39	32	10	30
January 30	36	24	10	30
January 31	49	21	11	31

Table II. Top Ten Warmest Average Temperature for
Sioux City, Iowa

Year	Average Temperature
2006	33.5
1933	31.5
1931	31.2
1992	30.7
1990	30.4
1989	29.9
1939	29.5
1919	29.2
1921	28.5
1944	28.5
1986	28.0
Normal	18.6

Table III. Top Ten Warmest Minimum Temperature for
Sioux City, Iowa

Year	Average Temperature
2006	23.1
1990	21.7
1944	21.6
1931	21.6
1939	20.7
1992	20.7
1919	20.3
1933	19.8
1989	19.3
1921	18.4
2002	18.4
Normal	8.5

 

Table IV. Top Ten Warmest Maximum Temperature for
Sioux City, Iowa

Year	Average Temperature
2006	43.8
1990	42.4
1933	41.4
1944	41.0
1931	40.6
1992	40.6
1989	40.4
2002	39.9
1986	38.9
1939	38.3
1919	38.1
Normal	28.7

 

Table V. Fewest Number of January Days
Below Zero in Sioux City, Iowa

Year	Average Temperature
1990	0
2006	0
1989	0
1933	0
1923	0
1921	0
1901	0
1898	0
1891	0
2002	1
1992	1
1941	1
1934	1
1914	1
1908	1
Normal	8

 

Table VI. Fewest Number of Days with a
Minimum Temperature of Less Than 10 Degrees
in Sioux City, Iowa

Year	Average Temperature
2006	0
1992	2
1990	2
1921	2
1933	3
1923	3
1939	5
1906	5
1891	5
1919	6
1987	6
1998	6
Normal	14

 

Table VII. Greatest Number of Days with a
Minimum Temperature Greater Than 19 Degrees
in Sioux City, Iowa

Year	Average Temperature
2006	23
1939	22
1919	21
1942	21
1931	21
1992	19
1933	18
1944	18
1921	18
1986	17
1989	17
Normal	8

Table VIII. Greatest Number of Days with a
Maximum Temperature of Greater Than 32 Degrees
in Sioux City, Iowa

Year	Average Temperature
2006	29
1919	28
1992	26
1989	26
1933	26
1944	24
1931	23
1939	23
1986	23
1964	22
1942	21
1923	21
1900	21
Normal	13