Climatography of the United States No

Transcription

1 Climate Division: WY 9 NWS Call Sign: LND Temperature ( F) Month (1) Min (2) Month(1) Extremes Lowest (2) Lowest Month(1) Degree s (1) Base Temp 65 Heating Cooling 100 Number of s (3) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec <= 32 Min <= 32 Min <= 0 Ann Aug Jul Dec Jan Also occurred on an earlier date(s) (1) From the Monthly Denotes mean number of days greater than 0 but less than.05 (2) Derived from station s available digital record: Complete documentation available from: /oa/climate/normals/usnormals.html (3) Derived from serially complete daily data Issue Date: February A

2 Climate Division: WY 9 NWS Call Sign: LND Precipitation (inches) Month s/ Medians(1) Median (2) Precipitation Totals Extremes Monthly(1) Lowest Monthly(1) 0.01 Number of s (3) Precipitation Precipitation Probabilities (1) Probability that the monthly/annual precipitation will be equal to or less than the indicated amount Monthly/Annual Precipitation vs Probability Levels These values were determined from the incomplete gamma distribution Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann May Apr Oct Also occurred on an earlier date(s) (1) From the Monthly Normals # Denotes amounts of a trace (2) Derived from station s available digital record: Denotes mean number of days greater than 0 but less than.05 (3) Derived from serially complete daily data ** Statistics not computed because less than six years out of thirty had measurable precipitation Complete documentation available from: /oa/climate/normals/usnormals.html 055-B

3 s Climate Division: WY 9 NWS Call Sign: LND Month s/medians (1) Extremes (2) Median Median (inches) Totals Number of s (1) Monthly Monthly Thresholds Thresholds Jan Feb Mar Apr May # Jun.3.0 # # # Jul Aug Sep # Oct # Nov Dec Ann N/A N/A 28.6 Apr Apr Dec Feb Also occurred on an earlier date(s) #Denotes trace amounts (1) Derived from Climatology and daily Denotes mean number of days greater than 0 but less than.05 (2) Derived from daily data -9/-9.9 represents missing values Complete documentation available from: Annual statistics for /Median snow depths are not appropriate /oa/climate/normals/usnormals.html 055-C

4 Climate Division: WY 9 NWS Call Sign: LND Temp (F) Freeze Data Spring Freeze Dates (Month/) Probability of later date in spring (thru Jul 31) than indicated(*) /19 6/13 6/08 6/04 6/01 5/28 5/24 5/19 5/ /06 5/31 5/26 5/22 5/19 5/15 5/11 5/07 4/ /17 5/13 5/09 5/07 5/04 5/01 4/29 4/25 4/ /03 4/28 4/24 4/21 4/18 4/15 4/11 4/08 4/ /26 4/19 4/15 4/11 4/07 4/04 3/31 3/26 3/ /18 4/11 4/05 4/01 3/27 3/23 3/18 3/13 3/06 Temp (F) Freeze Dates (Month/) Probability of earlier date in fall (beginning Aug 1) than indicated(*) /08 9/11 9/14 9/15 9/17 9/19 9/21 9/23 9/ /13 9/17 9/20 9/22 9/24 9/26 9/29 10/02 10/ /18 9/23 9/27 9/30 10/03 10/06 10/09 10/13 10/ /28 10/04 10/08 10/11 10/15 10/18 10/22 10/26 10/ /10 10/16 10/20 10/23 10/26 10/29 11/01 11/05 11/ /21 10/26 10/29 11/01 11/03 11/06 11/09 11/12 11/16 Temp (F) Freeze Free Period Probability of longer than indicated freeze free period (s) * Probability of observing a temperature as cold, or colder, later in the spring or earlier in the fall than the indicated date. 0/00 Indicates that the probability of occurrence of threshold temperature is less than the indicated probability. Derived from serially complete daily data Complete documentation available from: /oa/climate/normals/usnormals.html 055-D

5 Climate Division: WY 9 NWS Call Sign: LND Degree s to Selected Base Temperatures ( F) Base Heating Degree s (1) Below Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann Base Cooling Degree s (1) Above Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann Growing Degree Units (2) Base Growing Degree Units (Monthly) Growing Degree Units (Accumulated Monthly) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Base Growing Degree Units for Corn (Monthly) Growing Degree Units for Corn (Accumulated Monthly) 50/ (1) Derived from the Monthly Normals Complete documentation available from: (2) Derived from serially complete daily data /oa/climate/normals/usnormals.html Note: For corn, temperatures below 50 are set to 50, and temperatures above 86 are set to E

6 Notes a. The monthly means are simple arithmetic averages computed by summing the monthly values for the period and dividing by thirty. Prior to averaging, the data are adjusted if necessary to compensate for data quality issues, station moves or changes in station reporting practices. Missing months are replaced by estimates based on neighboring stations. b. The median is defined as the middle value in an ordered set of values. The median is being provided for the snow and precipitation elements because the mean can be a misleading value for precipitation normals. c. Only observed validated values were used to select the extreme daily values. d. Extreme monthly temperature/precipitation means were selected from the monthly normals data. Monthly snow extremes were calculated from daily values quality controlled to be consistent with the Climatology. e. Degree s were derived using the same techniques as the normals. Compete documentation for the Normals is available on the internet from: /oa/climate/normals/usnormals.html f. number of days statistics for temperature and precipitation were calculated from a serially complete daily data set. Documentation of the serially complete data set is available from the link below: g. fall and snow depth statistics were derived from the Climatology. Documentation for the Climatology project is available from the link under references. Data Sources for Tables Several different data sources were used to create the Clim20 climate summaries. In some cases the daily extremes appear inconsistent with the monthly extremes and or the mean number of days statistics. For example, a high daily extreme value may not be reflected in the highest monthly value or the mean number of days threshold that is less than and equal to the extreme value. Some of these difference are caused by different periods of record. extremes are derived from the station s entire period of record while the serial data and normals data were are for the period. Therefore extremes observed before 1971 would not be included in the normals or the serial daily data set. Inconsistencies can also occur when monthly values are adjusted to reflect the current observing conditions or were replaced during the Monthly Normals processing and are not reconciled with the Summary of the data. a. Temperature/ Precipitation Tables c. Tables 1. Monthly Normals 1. Climatology 2. Cooperative Summary of the 2. Cooperative Summary of the 3. National Weather Service station records 4. serially complete daily data d. Freeze Data Table serially complete daily data b. Degree Table 1. Monthly and Annual Heating and Cooling Degree s Normals to Selected Bases derived from Monthly Normals 2. Normal Growing Degree Units to Selected Base Temperatures derived from serially complete daily data References U.S. Climate Normals, /normals.html U.S. Climate Normals -Products Clim20, /oa/climate/normals/usnormalsprods.html Climatology Project Description, /oa/climate/monitoring/snowclim/mainpage.html Eischeid, J. K., P. Pasteris, H. F. Diaz, M. Plantico, and N. Lott, 2000: Creating a serially complete, national daily time series of temperature and precipitation for the Western United States. J. Appl. Meteorol., 39, , www1.ncdc.noaa.gov/pub/data/special/ serialcomplete_jam_0900.pdf