The Weather Wire

 

January 2010                                                                                                            Volume 17 Number 01

 

Contents

 

 

 
·   2009 Year in Review
 

·   Drought Monitor

 

·   December

    Summary

 

·   December Stats

 

·   January Preview

 

·   Sunrise/Sunset

 

·   Snow Totals

.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

December

Avg High - 36.4

Avg Low - 11.9

Snow - 11.1"

Season Snow - 37.6"

Precipitation - 0.45"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

January

Avg High - 43.2

Avg Low - 15.2

Avg Snow -  7.7"

Avg Precip - 0.51"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Skyview Weather 

2350 N Rocky View Rd

Castle Rock, CO 80108

 

Phone: (303) 688-9175

Fax: (303) 380-3338

 

E-mail:    

tim@skyview-wx.com

 

We’re on the Web!

http://www.skyview-wx.com/

 

Copyright 2010

Skyview Weather

2009 Year in Review

Looking back at 2009 the year began rather dry and mild without much snow for the months of January and February.  Towards the end of March the storm track became more active and between the 25-27th the season’s largest snow occurred for many areas below 6,500’ in elevation.   April continued to produce snow with 5 measureable snow events and on the 16-18th many foothill locations above 6,500’ received between 1-2 feet or more of snow with lower elevations mixing with rain resulting in much lower snow totals but overall liquid amounts were high especially west of I-25.  The last two months of spring made up for a winter lacking in snow and pushed seasonal snow totals to near normal for most locations except Colorado Springs, DIA and some Larimer County locations.  This wet weather pattern that developed in the spring would continue into the summer months with a very active and wet thunderstorm season for many Front Range communities north of the Palmer Divide.  The months of June and July in particular would provide over 8.0” of rainfall which is more than half of what Denver averages in an entire year!  Below is a graph of monthly precipitation at DIA versus normal. 

Notice the three spikes of well above normal precipitation and 8 months of below normal precipitation. 

As summer came to a close August and September were on the dry side, but October would prove to be a very cold and snowy month with an early season “blizzard” bringing more than 16-24” of snow to the Denver suburbs.  November and December would produce near normal snowfall with many areas already up to 60-75% of an entire winters worth of snow and we still have the 2 of the top 3 snowiest months to come in March and April!  Below is a graph of yearly snowfall at DIA:

 

 

 

 

 

 

 

Temperatures in October would be extremely cold for historical standards becoming the 2nd coldest October on record.  Average high temperatures in October were more than 11 degrees below normal.  December would also be cold for Colorado standards finishing as the 7th coldest December ever record.  Below are graphs of high and low temperatures at DIA for the year:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Notice how the trend was above normal temperatures for the first 5 months of the year then the last 7 months except September and November have all been below normal. 

2009 proved to be a rather cool and wet year with a total of 18.12” recorded at DIA versus 14.79” on average resulting in a surplus of 3.33” for 2009.  DIA was actually rather low on annual precipitation this year compared with other areas with many locations reporting over 20.0”. Here are some other Front Range yearly precipitation totals (reminder these yearly totals are not official, but will represent the locations fairly well):

Aurora South

22.69”

Broomfield

20.01”

Centennial

22.31”

Colorado Springs

15.74”

Denver SE

22.44”

Fort Collins

22.77”

Golden

24.67”

Highlands Ranch

23.93”

Lakewood

24.04”

Loveland

20.32

Wheatridge

24.22”

Drought Update

With the widespread precipitation of the last several months few areas of drought remain over Colorado, though some dry areas have developed in southwestern Colorado.

The map below shows forecasted temperature deviances for January 2010. As can be seen, normal temperatures are expected statewide, with the exception of far northwest Colorado where above normal temperatures are expected.

The map below shows forecasted precipitation deviances for January 2010.  All of Colorado is expected to have normal precipitation for January 2010.

Little in the way of drought remains in Colorado, with the exception of a small area in far southwest Colorado where any areas of drought are improving..

December Summary

December of 2009 was unusually cold with an average maximum temperature of 36.4 compared to 44.1 normally.  This was 7.7 degrees below normal and ranks December of 2009 as the 7th coldest on record.  Along with the cold came some snow with 11.1" reported at DIA which is 2.4" above normal and results in a 10.7" surplus so far this winter season.  The snow had little water content and the month actually fell below normal as far as melted precipitation with only 0.45" compared to 0.63" on average.  For the year Denver finished above normal in total precipitation by over 3" and many Denver suburbs were well well above that!  It has been quite awhile since we finished a year above normal in precipitation and the wetter than normal trend looks to continue into 2010.

December Stats

TEMPERATURE (IN DEGREES F)

 

 

 

 

 

 

AVERAGE MAX

36.4

NORMAL

44.1

DEPARTURE

-7.7

AVERAGE MIN

11.9

NORMAL

16.4

DEPARTURE

-4.5

MONTHLY MEAN

24.1

NORMAL

30.3

DEPARTURE

-6.2

HIGHEST

59 on the 21st

LOWEST

-17 on the 9th

 

 

 

 

 

 

DAYS WITH MAX 90 OR ABOVE

0

NORMAL

0

DAYS WITH MAX 32 OR BELOW

15

NORMAL

5.3

DAYS WITH MIN 32 OR BELOW

31

NORMAL

29.2

DAYS WITH MIN ZERO OR BELOW

6

NORMAL

2.8

 

 

 

 

 

 

TEMPERATURE RECORDS

 

No new temperature records broken or tied.

 

 

 

 

 

 

 

HEATING DEGREE DAYS

 

 

 

 

 

 

MONTHLY TOTAL

1260

NORMAL

1078

DEPARTURE

182

SEASONAL TOTAL

2739

NORMAL

2485

DEPARTURE

261

 

 

 

 

 

 

COOLING DEGREE DAYS

 

 

 

 

 

 

MONTHLY TOTAL

0

NORMAL

0

DEPARTURE

0

YEARLY TOTAL

533

NORMAL

696

DEPARTURE

-163

 

 

 

 

 

 

PRECIPITATION (IN INCHES)

 

 

 

 

 

 

MONTHLY TOTAL

0.45

NORMAL

0.63

DEPARTURE

-0.18

YEARLY TOTAL

18.12

NORMAL

14.79

DEPARTURE

3.33

GREATEST IN 24 HOURS

0.20" on the 22nd into the 23rd

DAYS WITH MEASURABLE PRECIPITATION

7

 

 

 

 

 

SNOWFALL (IN INCHES)

 

 

 

 

 

 

MONTHLY TOTAL

11.1

NORMAL

8.7

DEPARTURE

2.4

SEASONAL TOTAL

37.6

NORMAL

26.9

DEPARTURE

10.7

GREATEST IN 24 HOURS

5.9" from 12/23 to 12/24

GREATEST DEPTH

NA

 

 

 

 

 

 

WIND (IN MILES PER HOUR)

 

 

 

 

 

 

AVERAGE SPEED

8.8mph from the SW

PEAK WIND GUST

49mph from the WSW on the 13th

 

 

 

 

 

 

MISCELLANEOUS WEATHER

 

 

 

 

 

 

NUMBER OF DAYS WITH THUNDERSTORMS

0

NORMAL

0

NUMBER OF DAYS WITH HEAVY FOG

1

NORMAL

1

NUMBER OF DAYS WITH HAIL

0

 

 

PERCENT OF SUNSHINE

NA

NORMAL

67%

January Preview

January is the driest winter month for the Front Range and it is also the coldest.  Along with the cold air comes limited moisture with around 2-4 storms on average with each producing 1-3" type snowfall.  There are not typically any "heavy" snows during the month with 7.7" of total snowfall on average.  The unusually cold December has spilled over into January with below normal temperatures and near normal snowfall anticipated.  Average highs for the month are in the lower 40s with overnight lows typically in the teens.  The sun angle is still low during the month even though we add daylight each day and the snow is typically tough to melt as the ground is frozen solid. 

DENVER'S NOVEMBER CLIMATOLOGICALLY NORMAL

(NORMAL PERIOD 1971-2000)

 

 

TEMPERATURE

 

 

 

AVERAGE HIGH

43.2

AVERAGE LOW

15.2

MONTHLY MEAN

29.2

DAYS WITH HIGH 90 OR ABOVE

0

DAYS WITH HIGH 32 OR BELOW

7

DAYS WITH LOW 32 OR BELOW

30

DAYS WITH LOWS ZERO OR BELOW

4

 

 

PRECIPITATION

 

 

 

MONTHLY MEAN

0.51"

DAYS WITH MEASURABLE PRECIPITATION

6

AVERAGE SNOWFALL IN INCHES

7.7"

DAYS WITH 1.0 INCH OF SNOW OR MORE

2

 

 

MISCELLANEOUS AVERAGES

 

 

 

HEATING DEGREE DAYS

1111

COOLING DEGREE DAYS

0

WIND SPEED (MPH)

8.6mph

WIND DIRECTION

South

DAYS WITH THUNDERSTORMS

Less than 1

DAYS WITH DENSE FOG

1

PERCENT OF SUNSHINE POSSIBLE

71%

 

 

EXTREMES

 

 

 

RECORD HIGH

76 on 1/27/1888

RECORD LOW

-29 on 1/9/1875

WARMEST

40.3 in 1986

COLDEST

16.9 in 1930

WETTEST

2.35" in 1883

DRIEST

0.01" in 1933, 1934, 1952

SNOWIEST

24.3" in 1992

LEAST SNOWIEST

Trace in 1934, 2003
 

Sunrise/Sunset (Jan - June Denver area)

             JAN              FEB               MAR              APR              MAY              JUN
_______________________________________________________________________________
      sr - ss     sr - ss     sr - ss     sr - ss     sr - ss     sr - ss 
 01  0721-0446 | 0707-0518 | 0632-0550 | 0544-0623 | 0600-0753 | 0534-0821  01
 02  0721-0447 | 0706-0519 | 0631-0551 | 0542-0624 | 0559-0754 | 0533-0822  02
 03  0721-0448 | 0705-0520 | 0629-0553 | 0540-0625 | 0558-0755 | 0533-0822  03
 04  0721-0448 | 0704-0522 | 0628-0554 | 0639-0726 | 0556-0756 | 0533-0823  04
 
 05  0721-0449 | 0703-0523 | 0626-0555 | 0637-0727 | 0555-0757 | 0532-0824  05
 06  0721-0450 | 0702-0524 | 0625-0556 | 0636-0728 | 0554-0758 | 0532-0824  06
 07  0721-0451 | 0701-0525 | 0623-0557 | 0634-0729 | 0553-0759 | 0532-0825  07
 08  0720-0452 | 0700-0526 | 0622-0558 | 0633-0730 | 0552-0800 | 0532-0825  08
 
 09  0720-0453 | 0659-0527 | 0620-0559 | 0631-0731 | 0551-0801 | 0531-0826  09
 10  0720-0454 | 0658-0529 | 0619-0600 | 0630-0732 | 0550-0802 | 0531-0827  10
 11  0720-0455 | 0657-0530 | 0617-0601 | 0628-0733 | 0549-0803 | 0531-0827  11
 12  0720-0456 | 0655-0531 | 0616-0602 | 0626-0734 | 0548-0804 | 0531-0828  12
 
 13  0719-0457 | 0654-0532 | 0614-0603 | 0625-0735 | 0547-0805 | 0531-0828  13
 14  0719-0458 | 0653-0533 | 0612-0604 | 0623-0736 | 0546-0806 | 0531-0828  14
 15  0719-0459 | 0652-0535 | 0611-0605 | 0622-0737 | 0545-0806 | 0531-0829  15
 16  0718-0501 | 0650-0536 | 0609-0606 | 0620-0738 | 0544-0807 | 0531-0829  16
 
 17  0718-0501 | 0649-0537 | 0608-0607 | 0619-0739 | 0543-0808 | 0531-0830  17
 18  0717-0502 | 0648-0538 | 0606-0608 | 0618-0740 | 0542-0809 | 0531-0830  18
 19  0717-0503 | 0647-0539 | 0604-0609 | 0616-0741 | 0542-0810 | 0531-0830  19
 20  0716-0504 | 0645-0540 | 0603-0610 | 0615-0742 | 0541-0811 | 0532-0830  20
 
 21  0716-0505 | 0644-0541 | 0601-0612 | 0613-0743 | 0540-0812 | 0532-0831  21
 22  0715-0506 | 0642-0543 | 0600-0613 | 0612-0744 | 0539-0813 | 0532-0831  22
 23  0714-0507 | 0641-0544 | 0558-0614 | 0611-0745 | 0539-0814 | 0532-0831  23
 24  0714-0509 | 0640-0545 | 0556-0615 | 0609-0746 | 0538-0815 | 0533-0831  24
 
 25  0713-0510 | 0638-0546 | 0555-0616 | 0608-0747 | 0537-0815 | 0533-0831  25
 26  0712-0511 | 0637-0547 | 0553-0617 | 0606-0748 | 0537-0816 | 0533-0831  26
 27  0712-0512 | 0635-0548 | 0552-0618 | 0605-0749 | 0536-0817 | 0534-0832  27
 28  0711-0513 | 0634-0549 | 0550-0619 | 0604-0750 | 0536-0818 | 0534-0832  28
 
 29  0710-0514 |                     | 0548-0620 | 0603-0751 | 0535-0819 | 0534-0832  29
 30  0709-0516 |                     | 0547-0621 | 0601-0752 | 0535-0819 | 0535-0831  30
 31  0708-0517 |                     | 0545-0622 |                      | 0534-0820 |                       31


Snowfall

Sept 2009 to Apr 2010

City

Sept-Oct

Nov

Dec

Jan

Feb

Mar Apr

Seasonal Totals

Aurora (Central)

20.2 9.3 13.8         43.3
Brighton 18.4 8.3 12.4         39.1
Broomfield 27.2 11.8 17.3         56.3

Castle Rock 4 NE

27.5 8.7 12.5         48.7

Colorado Sprgs Airport

1.8 1.5 9.4         12.7
Denver DIA 17.2 9.3 11.1         37.6

Denver Downtown

21.4 9.0 16.1         46.5

Golden

28.3 12.9 21.7         62.9

Fort Collins

25.5 6.6 19.5         51.6

Highlands Ranch

34.4 9.7 15.4         59.5

Lakewood

20.5 9.0 12.4         41.9

Littleton

25.9 12.2 16.0         54.1

Parker

22.5 8.2 12.8         43.5

Sedalia - Hwy 67

30.0 10.0 10.5         50.5

Thornton

22.8 8.3 16.6         47.7

Westminster

21.6 13.0 15.2         49.8

Wheatridge

28.8 10.9 15.6         55.3