Air Temperature Relative Humidity Wind Speed Wind Direction. Solar Radiation

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2 Variables collected at VMC sites: VMC Site CASTET Colchester Reef Mount Mansfield (W) PMRC Start fdata Co//ection: January 1994 ovember 1996 January 1997 January 1988 Variables Collected: Air Temperature Relative Humidity Wind Speed Wind Direction Precipitation Solar Radiation Air Temperature Relative Humidity Wind Speed Wind Direction Barometric Pressure Water Temperature Solar Radiation Air Temperature Relative Humidity Wind Speed Wind Direction Precipitation Solar Radiation Air Temperature Relative Humidity Wind Speed Wind Direction Precipitation Barometric Pressu Photosynthetically Active Radiation (PAR) The criteria for data completeness are as follows: each hour must include a minimum of one 15 minute interval data set and each day must have at least 75% of the hourly data. umber of days in the month are reported in Table 2. Data for MMWest in September 1997 has been excluded from this report due to lack of completeness. Data are reported in a variety of temporal formats. Fifteen minute average data (from MMWest, CR and CASTET) are arithmetically averaged to provide hourly means, which are then averaged into daily means. Monthly and yearly summaries are created from daily data. A number of summary statistics including means, maximum and minimum values, and number of observations are generated. Growing degree days are calculated by adding the degrees above freezing for a given day to the next day's above freezing value. Days when temperature does not go above freezing are given a value of zero. Results and Discussion Yearly and montwy 1997 data summaries for each of the sites are presented in Tables 1 and 2, respectively. Variables (mean air temperature, mean relative humidity, mean barometric pressure, mean total solar irradiance (pyranometer), and mean resultant wind speed) are summarized by month and displayed for site to site comparison (Figure 1); note that Y-axis scales vary. Figure 2 shows a comparison of several meteorological variables at individual sites. Daily total precipitation by month for PMRC AQ is summarized in Figure 3; note that the y-axis scale has been standardized to facilitate comparisons across time. Daily mean, minimum, and maximum temperatures at PMRC AQ are shown by month in Figure 4. Please note that the x- axis crosses the y -axis at degrees Celsius and the y -axis scale is standardized for ease of companson. '7

3 Cumulative growing degree days are based on start temperatures of32 and 5 degrees Fahrenheit, temperature thresholds for plants and insects, respectively, and are plotted together in Figure 5. The ortheast Regional Climate Center reported that in 1997 overall regional temperatures produced a warm winter and cold spring. Most of the northeast was dry, but Vermont was not, with flooding occurring in Montgomery in July Two excellent resources for meteorological information are the VT Climatology web site, and the ortheast Regional Climate Center (RCC). RCC provides interpretive monthly climate summaries and can be accessed via 8

4 Table I: VMC Yearly Data Comparisons For \'ite ColchReef LYE PMRCAQ West lv.\'um

5 Table 2: VMC Meteorological Monthly Data Comparisons For 1997 Site "onth degree., C mb mi.vecond ColchReef Jan , Mill Feb 1i1a Mar,"'tin "+1ean ""fin tfax ft-iin

6 Site Month ColchReef Jun " Mill Jul ,+la Mill.f}um lean M(L\: lax Milt,V , act i lin

7 Site.\lonth ColchReef ov Dec 1Ma. 1tfin.um LYE145 Jan ,IV.\'urn Feb " l"fin Mar,'fax

8 Site,\{onth Wurd Speed: JJuJd Direction: Air H2 Barom Rei Temp Temp p,. Humd Precip pyranom "'fax Resultant Resultant StDev degrees C mh % mm wattslm 2 mi.vecond degrees LYE " , ,.f}um Jun 1tlean Jul b'lax ,IV ax A-/in

9 PMRC AQ Feb Mill Mar ;.\'urn Mill Jun

10 Site Month Air H2 Barom Rei Temp Temp Pre.. Humd Precip pyranom Resultant Resultant StDev degrees C /lib % IIIIII watts//11 2 mi.vecond degrees PMRC AQ Jul Mill 'um \'urn act ov lin

11 Site." nth degrees c mb wattslm 2 % mm mi.vecond PMRC AQ Jul ,Wax ,'lax,.um act ""lax,iv a ,Mt JtIin

12 Site,\lonth PMRC AQ Dec ,tJean "Ma. Mill West Jan Feb,V Mar, P!-,'1a.,\:

13 Site WInd,\'peed: JJ'il,d Direction; Month West Jun..\'um Jul act lr a

14 Site,i\{onth WInd.\'peed: JJ'il,d Direction: Air Hl Barom Rei Temp Temp PrP. Humd Precip pyranom "'fax Resultant Resultant StDev degree.1' C /IIh % mm wattslm 1 mlsecond degrees West ov Dec MlL ,

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16 Air Temperature T (C) Month -+-ColchReef ---LYE PMRC AQ ---West Relative Humidity L RH % ===::..., *"---/

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19 Figure 2: Meteorological Variables marized By Month n Individual Sites PMRCAQ Precip and RH (cm and %) Barom (mb) p Month I::=:J AvgfBaroPress -+-- fprcp ---AvgfReIHumd 24

20 March June Total Daily Precipitation 4 mm I I.I.I l ) 25

21 ctober Total Daily Precipitation I ovember Total Daily Precipitation December Total Daily Precipitation 4 mm mm 2 1 J,1,1.1,,-,1,.,-,,1,,,,,,,, ),1,-,,!,-,

22 Figure 4: PMRC AQ Daily Temperature January Air T (C) r..i'ean(bilytemp -x(bilytemp -Mn(BilyTemp May March

23 Figure 4: I i PMRC AQ Daily Temperature July Air T (C) ctober anceilytemp -MnceilyTemp rv'axdailytemp I ovember Air T (C)

24 '< 177 o - -< 188 ID 199 U1 8 8 o -" Gring Degree Day c.j c.j 8 8 o o o o.,.. 8 o I I g' g' (/) (/)!P..!P.. 5' 5' (1) (1) '(j1'"(;) ::!)::!) UI 8 o (11 if UI.. i"c ("') >. ("') C a C e -. = (JQ td (JQ... td '< fij "" L