Elkhorn Slough (ELK) NERR Meteorological Metadata January-December 2001 Latest Update: February 28, 2005

Meteorological monitoring is conducted at 26 National Estuarine Research Reserves (NERR)
from at least one location within or adjacent to the reserve. Data are collected every 5 seconds
and averages are produced from this data at quarterly (15 minutes), hourly (60 minutes) and
daily (1440 minutes) intervals. The parameters collected within these intervals are: averages,
maximums and minimums of air temperature, relative humidity, barometric pressure, wind speed,
wind direction, precipitation and photosynthetically active solar radiation. Research objectives
The principle objective is to record long-term meteorological data for Elkhorn Slough to observe
any environmental changes or trends over time. These data are also collected as a part of a
county wide monitoring program and are made available for researchers that may be interested in
them.

SUPPLEMENTAL INFORMATION:
Associated researchers and projects. Rain data from the weather
station are shared with the Naval Post Graduate School who in turn organize these data from many
stations in the county. These weather data are also combined with water quality data for
analysis and correlations with rain events. Other remarks/notes Rain Events: January Date Rain
Amount (mm) 8 10.414 9 .762 10 16.510 11 2.286 12 2.032 13 1.524 14 1.016 15 .508 23 11.176 24
31.242 25 16.764 26 1.016 28 .254 29 .762 30 .254 Monthly Total 96.5 February Date Rain Amount
(mm) 9 13.970 10 10.668 11 15.494 12 8.890 15 .254 17 2.286 18 2.032 19 17.526 21 .508 22 5.588
23 10.160 24 13.208 25 8.128 Monthly Total 108.7 March Date Rain Amount (mm) 2 3.556 3 3.556 4
21.844 5 6.604 6 1.270 13 .254 19 .254 24 2.794 25 .508 30 .254 Monthly Total 40.9 April Date
Rain Amount (mm) 6 7.112 7 10.414 9 1.270 10 .254 11 .254 16 .254 18 .762 19 1.524 20 11.938 21
.254 24 .254 27 .254 Monthly Total 34.5 May Date Rain Amount (mm) 7 .254 11 .254 24 .254 27 .254
Monthly Total 1.0 June Date Rain Amount (mm) 20 .254 26 .254 29 .254 Monthly Total .8 July Date
Rain Amount (mm) No rain August Date Rain amount (mm) 5 .254 7 .254 24 .254 26 .254 28 .254 31
1.016 Monthly Total 2.3 September Date Rain Amount (mm) 3 .254 8 .254 17 .254 19 .254 25 1.524
26 .254 27 .254 Monthly Total 3.0 October Date Rain amount (mm) 3 .254 11 .254 18 .254 19 .254
20 .254 22 .254 24 .254 30 8.382 31 .254 Monthly Total 10.4 November Date Rain amount (mm) 1
.254 4 .254 5 .254 6 .254 7 .254 10 .762 11 .508 12 2.540 13 2.540 14 .508 15 .254 16 .254 18
.254 19 15.748 21 .254 22 4.572 23 .254 24 21.336 25 1.270 28 7.112 29 23.368 Monthly Total 82.8
December Day Rain Amount (mm) 1 8.636 2 31.496 3 3.048 4 1.270 5 1.270 6 .254 9 .254 15 .254 16
.762 17 14.478 19 .762 20 36.068 21 19.304 22 1.270 23 1.778 27 .508 28 13.208 29 20.574 30
14.478 Monthly Total 169.7

CURRENTNESS REFERENCE:
Observed

SPATIAL DATA ORGANIZATION INFORMATION:
Indirect Spatial Reference: Site location and character The Elkhorn Slough NERR is located on
the central California coast at the head of the Monterey Bay. There is one weather station on
the reserve that is located approximately one kilometer south of the South Marsh water quality
site. The coordinates for this station are 38° 48' 55.44" N, 121° 44' 16.8" W. The sensors are
located on a 10 ft tower placed according to descriptions outlined in the CDMO Manual V 4.0 and
are located approximately 200 feet above the marsh on a bluff in the uplands of the marsh. The
tipping bucket is located to the west away from the tower. There are no shadow or wind
obstructions from buildings or trees in the immediate area surrounding the location of the
sensors.