IMPERIAL BEACH NALF (NRS)
LAT 32 34N
LONG 117 07W
ELEV 00026(ft) 00008(m)
TYPE NAVY SMOS V3 16031995
PERIOD OF RECORD 1945-1993
GENERAL SUMMARY:
Outlying Landing Field, Imperial Beach,
California is located on a coastal plain in the
extreme southwestern section of the state. The
Pacific Ocean is one mile west and the Mexican
border 2 miles south. The city of San Diego is 15
miles north.
Imperial Beach is characterized by a sub-
tropical climate with very dry summers and rain
occurring during the winter season. The most
significant precipitation amounts occur in November,
December, January, February and March. The dry
season extends from May through October. On rare
occasions an extra-tropical storm may move into this
area in late August or September from the south,
bringing moderate east to southeast winds and heavy
rainfall.
The station is subject to daily land and sea
breezes. The sea breeze commences 2 to 4 hours
after sunrise and is experienced as a westerly wind
with an average speed of 10 knots. Land breezes
normally begin 2 to 4 hours after sunset and are
generally lighter than sea breezes. The approach of
a cold front may increase the local winds from south
or southwest and they may reach speeds of 30 to 40
knots. After the frontal passage the winds diminish
at the station as they shift to the north or
northwest even though offshore they may continue to
maintain speeds in excess of 30 knots. When "Santa
Ana" winds occur, normally during the fall and
winter months, there is a sharp increase in
temperature as winds begin blowing from the Mojave
Desert. The humidity may decrease to 15%% or less.
Winds generally are sustained at 18 to 24 knots with
gusts in excess of 30 knots from the east or
southeast.
Thunderstorms at the station in the summer are
infrequent and usually very weak. They occur with
greatest frequency in the interior and are usually
confined to the higher mountains and southeastern
desert areas. During the winter they are rare but
sometimes accompany cold frontal passages.
Flying conditions in the local area are
generally excellent throughout the year. Visual
Flight Rules (VFR) may be expected to prevail at the
station on an average of 86%% of the time in all
seasons. Conditions over the operating area to
seaward and the mountainous areas inland are
somewhat less favorable. The most important weather
phenomena, from flying standpoint, is the frequent
stratus and fog conditions along the Southern
California coast. These conditions occur most
frequently and over extended periods during the
summer.
A local phenomena called the Catalina Eddy has
a critical effect on fog and stratus along the coast
from Santa Barbara to the Mexican border. The
stratus layer is carried farther north and inland
than would normally be expected.
Snow has been recorded once. A trace was
observed in December 1967.
--------------------------------------------------------------
Percent Frequency Daily PRECIPITATION AMOUNTS
PERCENT TOTAL TOTAL
OF DAYS NO. PRECIP
WITH OF (INCHES)
INCHES AMOUNTS OBS MEAN HI LOW
NONE TRACE .01 <=.05 <=.10 <=.25 <=.50 <=1.0 <=2.5 <=5.0 <=10.0 <=20.0 >20.0 >=.01
JAN 74.4 5.3 2.1 4.4 2.9 4.5 3.8 1.7 .9 0 0 0 0 20.3 1071 1.53 7.47 T
FEB 74.0 7.8 1.4 4.3 3.2 4.1 2.7 2.6 .1 0 0 0 0 18.3 887 1.13 4.36 T
MAR 72.4 7.1 1.2 3.9 3.7 4.8 4.0 2.2 .6 0 0 0 0 20.5 1147 1.57 5.45 T
APR 79.5 7.7 1.2 3.0 2.6 3.1 2.0 .8 .1 0 0 0 0 12.9 1066 .68 3.22 0
MAY 84.1 10.8 .9 2.2 .9 .9 .1 .1 .1 0 0 0 0 5.1 1175 .14 1.15 0
JUN 84.2 12.7 .6 1.6 .3 .1 .4 .2 0 0 0 0 0 3.1 1131 .10 1.54 0
JUL 91.7 6.4 .5 .8 .3 .2 .2 0 0 0 0 0 0 1.9 1147 .04 .80 0
AUG 93.2 5.4 .3 .9 0 .1 0 .1 .1 0 0 0 0 1.5 1155 .07 2.10 0
SEP 88.8 7.6 .1 1.6 .5 .7 .4 .1 .2 0 0 0 0 3.6 1093 .18 2.25 0
OCT 85.4 7.2 1.0 2.2 1.4 1.6 .8 .4 0 0 0 0 0 7.4 1108 .29 1.72 0
NOV 81.3 4.2 1.2 3.4 1.6 3.2 2.2 2.0 .7 .1 0 0 0 14.4 970 1.31 6.42 0
DEC 78.0 6.1 .9 3.7 2.5 3.9 2.5 1.7 .6 0 0 0 0 15.9 1144 1.24 6.68 T
ANN 82.4 7.3 .9 2.6 1.6 2.2 1.6 1.0 .3 * 0 0 0 10.3 13471 8.26 16.66 4.03
* = PERCENT < .05
T = ZERO PRECIP, SNOWFALL OR SNOW DEPTH MEASURED BUT A TRACE WAS NOTED
+ = ANNUAL HI AND LOW VALUES ARE DERIVED FROM ANNUAL TOTALS
# = EXCESSIVE MISSING DATA - VALUE NOT COMPUTED
Cumulative Percent Frequency Daily MINIMUM TEMPERATURES
Temp(F) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
>=75 0 0 0 0 0 0 0 .1 0 0 0 0 *
>=70 0 0 0 0 0 0 1.7 3.2 1.2 .3 0 0 .5
>=65 0 0 0 0 1.0 2.5 29.5 52.7 31.1 4.3 0 0 10.0
>=60 .7 .3 .9 3.1 17.4 52.6 85.9 94.4 80.5 35.9 3.0 .8 31.0
>=55 7.1 10.1 11.8 34.5 72.7 95.1 98.9 99.9 97.4 72.8 21.3 6.1 52.3
>=50 27.0 39.1 51.2 73.4 96.5 99.6 100 100 100 94.4 58.9 27.6 72.4
>=45 57.3 71.6 85.5 95.5 99.7 100 100 100 100 99.3 86.0 62.3 88.2
>=40 86.8 94.8 98.3 99.6 100 100 100 100 100 99.8 98.1 92.1 97.5
>=35 98.4 99.8 99.9 99.9 100 100 100 100 100 100 100 99.0 99.8
>=30 99.3 100 100 100 100 100 100 100 100 100 100 100 99.9
>=25 100 100 100 100 100 100 100 100 100 100 100 100 100
MEAN 45.9 47.8 49.4 52.3 56.4 59.5 62.8 64.4 62.5 57.3 50.3 46.3 54.6
STDV 5.7 5.1 4.5 4.4 3.4 2.7 3.3 2.9 3.6 4.7 5.1 5.1 7.7
#OBS 1030 925 1049 1099 1071 1000 1038 992 999 1035 978 104912265
* = PERCENT < .05
# = EXCESSIVE MISSING DATA - VALUE NOT COMPUTED
Cumulative Percent Frequency Daily MAXIMUM TEMPERATURES
Temp(F) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
>=105 0 0 0 0 0 0 0 0 .2 .1 0 0 *
>=100 0 0 0 0 0 0 0 0 .4 .2 0 0 *
>=95 0 0 0 .1 0 0 .1 .1 .7 .8 .5 0 .2
>=90 0 0 .1 .3 .2 .4 .2 .3 1.3 1.7 .8 0 .4
>=85 .1 .2 .3 .6 .4 1.1 1.2 .6 3.2 4.5 1.6 .2 1.2
>=80 1.7 1.9 1.0 1.8 1.3 2.7 4.3 5.2 8.3 8.8 4.7 1.8 3.6
>=75 6.9 6.1 3.8 5.7 3.6 6.5 26.1 42.5 35.8 19.5 14.0 6.8 14.6
>=70 15.9 14.7 11.8 15.9 21.1 42.1 78.6 96.0 89.5 64.7 31.9 18.8 41.5
>=65 39.4 38.0 35.7 58.9 83.8 93.0 99.7 100 99.9 97.4 73.5 46.3 72.0
>=60 78.6 84.6 90.0 98.1 99.7 100 100 100 100 99.8 97.6 83.5 94.3
>=55 97.3 99.4 99.8 100 100 100 100 100 100 99.9 100 98.2 99.5
>=50 100 100 100 100 100 100 100 100 100 100 100 100 100
MEAN 64.0 64.3 64.1 66.1 67.5 69.2 72.6 74.2 73.9 71.9 68.2 64.7 68.4
STDV 5.8 5.4 4.6 4.6 3.6 4.0 3.8 3.1 4.5 5.5 5.9 5.8 6.1
#OBS 1139 1017 1147 1174 1152 1087 1125 1087 1085 1114 1069 113613332
* = PERCENT < .05
# = EXCESSIVE MISSING DATA - VALUE NOT COMPUTED
--------------------------------------------------------------------------------
------------------INTERNATIONAL STATION METEOROLOGICAL CLIMATE SUMMARY-------------------
:STA 722909 | KNRS | IMPERIAL BEACH NALF ,CA,US
:LAT 32 34N :LONG 117 07W :ELEV 00026(ft) 00008(m) :TYPE NAVY SMOS V3 16031995
37 - STATION CLIMATIC SUMMARY
POR: (HOURLY): 1945-1993
TEMPERATURE (DEG F)| PRECIPITATION (INCHES) (^) |REL HUM|VAP|DEW| PR |WIND (KTS) | | MEAN NO. OF DAYS WITH (&)
MEANS |EXTREME| PRECIP. |SNOWFALL (@)|PERCENT|PR |PT.| ALT| |SKY|PRECIP.|SNOW- | | | TEMP (DEG F)
| | | | | | | |24H| | |24H| (LST) |IN.|(F)| FT.|PREVAIL|MAX|CVR|INCHES |FALL(")|TH |FOG|MAX|MAX|MIN|MIN
MAX|MIN|AVG|MAX|MIN| MEAN| MAX| MIN|MAX|MEAN|MAX|MAX| AM| PM|HG.| | $ |DIR|SPD|GST| + | >=| >=| >=| >=|STM| * | >=| >=| <=| <=
| 07| 16| |.01|.50|.10|1.5| | 90| 70| 32| 10
JAN 64 46 55 86 26 1.5 7.5 T 2.3 0 0 0 74 67 .29 44 20 E 6 49 SCT 6 1 0 0 # 14 0 5 # 0
FEB 64 48 56 88 32 1.1 4.4 T 2.4 0 0 0 77 68 .32 46 25 E 6 46 SCT 5 1 0 0 # 12 0 4 # 0
MAR 64 49 57 93 33 1.6 5.4 T 1.7 0 0 0 78 67 .34 48 25 W 8 52 SCT 6 1 0 0 # 12 # 4 0 0
APR 66 52 59 99 34 .7 3.2 0 1.2 0 0 0 75 67 .37 51 20 W 8 48 SCT 4 # 0 0 # 11 # 5 0 0
MAY 67 56 62 92 44 .1 1.1 0 1.0 0 0 0 75 68 .41 53 20 W 8 37 OVR 2 # 0 0 0 8 # 7 0 0
JUN 69 59 65 94 46 .1 1.5 0 .8 0 0 0 79 70 .46 56 25 W 7 28 OVR 1 # 0 0 # 14 # 13 0 0
JUL 73 63 68 96 52 T .8 0 .5 0 0 0 81 71 .53 60 20 W 7 27 SCT 1 0 0 0 # 15 # 24 0 0
AUG 74 64 69 97 53 .1 2.1 0 1.4 0 0 0 82 72 .56 62 20 W 7 30 SCT # # 0 0 # 15 # 30 0 0
SEP 74 62 68 108 51 .2 2.3 0 1.1 0 0 0 80 72 .53 61 30 W 6 38 SCT 1 # 0 0 # 16 # 27 0 0
OCT 72 57 65 105 35 .3 1.7 0 .6 0 0 0 76 71 .45 56 25 W 6 41 SCT 2 # 0 0 # 17 1 20 0 0
NOV 68 50 60 99 35 1.3 6.4 0 2.9 0 0 0 72 68 .34 49 20 E 6 51 CLR 4 1 0 0 # 14 # 10 0 0
DEC 65 46 56 87 30 1.2 6.7 T 2.3 0 0 0 72 67 .29 44 25 E 6 44 CLR 5 1 0 0 # 15 0 6 # 0
ANN 68 55 62 108 26 8.3 16.7 4.0 2.9 0 0 0 77 69 .40 53 30 W 7 52 SCT 37 5 0 0 5 163 2 153 # 0
POR 37 34 34 37 34 37 37 37 37 37 37 37 37 37 31 31 30 31 31 31 27 37 37 37 37 19 19 37 34 34 34
T = TRACE AMOUNTS ( < .05 < .5 INCHES
# = MEAN NO. DAYS < .5 DAYS
$ = PRESSURE ALTITUDE IN TENS OF FEET (I.E. 50 = 500 FEET)
@ = NAVY STATIONS REPORT HAIL AS SNOWFALL; ALSO NWS FROM JULY,1948 - DEC.,1955
+ = THE PREDOMINANT SKY CONDITION
* = VISIBILITY IS NOT CONSIDERED
& = ANN TOTALS MAY NOT EQUAL SUM OF MONTHLY VALUES DUE TO ROUNDING
^ = 24 HR MAX PRECIP AND SNOWFALL ARE DAILY TOTALS (MID-NIGHT TO MID-NIGHT)
I = EXCESSIVE MISSING DATA - VALUE NOT COMPUTED
" = INCHES
--------------------------------------------------------------------------------
MEAN NO. OF DAYS WITH (&) |
PRECIPITATION | OBSTR TO VISION |
|FRZ | |HAIL| |SMOK|BLOW|DUST| OBS|
R/DZ|R/DZ|SNOW|/SLT|PRCP|HAZE|SNOW|SAND| VIS|
JAN 9 0 0 # 9 11 0 # 17
FEB 7 0 0 # 7 11 0 # 15
MAR 8 0 0 0 8 10 0 0 14
APR 7 0 0 # 7 13 0 0 16
MAY 5 0 0 0 5 11 0 0 13
JUN 7 0 0 0 7 15 0 0 18
JUL 3 0 0 0 3 19 0 0 23
AUG 2 0 0 0 2 19 0 0 22
SEP 3 0 0 0 3 19 0 0 22
OCT 5 0 0 # 5 19 0 # 21
NOV 6 0 0 0 6 12 0 # 17
DEC 7 0 0 # 7 11 0 # 18
ANN 69 0 0 # 69 170 0 1 216
POR 19 19 19 19 19 19 19 19 19
& = ANN TOTALS MAY NOT EQUAL SUM OF MONTHLY VALUES DUE TO ROUNDING
I = EXCESSIVE MISSING DATA - VALUE NOT COMPUTED
# = MEAN NO. DAYS < .5 DAYS
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