What channel is North Dakota on tonight?

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Isolines are drawn through points of approximately equal values.

Hourly precipitation data from recorder substations will be available in the publication "ilourly Precipitation

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VOOROCABREVILLE Isolines aro drawn through points of approximately equal values. Data"

Hourly precipitation data from recorder substations will be available in the publication "Hourly Precipitation

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Additional information regarding the climate of North Dakota may be obtained by writing to the State Climatologist at Weather Bureau Airport Station, Bismarck, North Dakota, or to any Weather Bureau Office near you.

Unless otherwise indicated, dimensional units used in this bulletin are:

Temperature in °F., precipitation and evaporation in inches, and wind movement in miles.

Evaporation is measured in the standard Feather Bureau type pan of 4 foot diameter unless otherwise shown by footnote following Table 4.

Long-term means for full-time stations (those with Weather Bureau, Weather Bureau Airport, or Weather Bureau City in the station name) are based on the period 1921-1950 adjusted to represent observations taken at the present location. Long-term means for all stations except full-time Weather Bureau stations are based on the period 1931-1955.

Climatological divisions, outlined on the maps in this bulletin, became effective with data for August 1956.

Figures and letters following the station name, such as 12 SSW, indicate distance in miles and direction from the post office.

Delayed data and corrections will be carried in the June and December issues of Climatological Data.

No record Also later date (dates) or months. Amount included in following measurement.

Includes total for previous month. Vin annual column means total is for a two-year period.

Gage is equipped with a windshield.
Thermometers are generally exposed in a shelter located a few feet above sod covered ground; however the reference indicates that the thermometers
are exposed in a shelter located on the roof of a building. Adjusted to full month. Data for recorder stations denoted by "C" in the Refer to Tables column of the Station Index are processed for special purposes and published in

"Hourly Precipitation Data". Length of

record for recorder-only stations may be found in the annual issue of "Hourly Precipitation Data".
E Amount is wholly or partially estimated.
N One or more days' record missing; if average value is entered, less than 10 days record is missing. See monthly climatological Data for

detailed daily record.
Amounts from recording gage. (These amounts are essentially accurate but may vary slightly from the amounts to be published later in Hourly

Precipitation Data.) T Trace, an amount too small to measure. Information concerning the history of changes in location, elevations, exposures, etc., of substations through 1955 may be found in the publication "Substation History for this state. That publication may be obtained from the Superintendent of Documents, Government Printing office, Washington, D. C., for 25 cents. Sivilar information for regular Weather Bureau stations may be found in the latest issue of Local climatological Data annuals, obtained as indicated above, price 15 cents.

Subscription Price: 20 cents per copy, monthly and annual; $2.50 per year. (Yearly subscription includes the Annual Summary.) Checks and money orders should be aade payable to the Superintendent of Documents. Remittances and correspondence regarding subscriptions should be sent to the Superintendent of Documents, Government Printing Office, Washington 25, D.C.

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35 14 - 3

3 21 10 6 6 7 6 10 2 15 301 19 18 10-11 12.8 13-4-15-17 - 8 - 9 -7 -10 -11 -16 - 6 -13 -15 - 2 - 2 - 2 -13 -20 - 3.6

44 43 21 7 25 28 29

6 5 33 12 10 24 36 19 17 31 18 - 5

61 20.0 1 18 - 4 -15 -12 - 6 - 8 5 0-10 - 4 14 - 1 -16 -17

33 31 1 7 - 8 17

2 1 4 o 12 17

9 - 3

9.7 9 - 2-11-25 - 30 -21-16 -14 -15 -20 -21 -16 -29 -27 -19 - 9 -11 -27 -26-19.2 41 35 9 0 10 28 15 1 5 5 10 12 8 9 31 21 14 8 17

5 16.4 7

9-15 -10 - 8 -12 - 6 -17-11-17 5 0 - 2 - 9 6 - 8 -15 -32 - 5.)

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UNCOKOLAGSVILU Isolines are drawn through points of approximately equal values. Data".

Hourly precipitation data from recorder substations will be available in the publication "Hourly Precipitation

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Additional information regarding the climate of North Dakota may be obtained by writing to the State climatologist at Weather Bureau Airport Station, Bismarck North Dakota, or to any Weather Bureau office near you.

Figures and letters following the station name, such as 12 ssw, indicate distance in miles and direction from the post office.

Delayed data and corrections will be carried only in the June and December issues of this bulletin.

Monthly and seasonal snowfall and heating degree days for the preceding 12 months will be carried in the June issue of this bulletin.

Stations appearing in the Index, but for which data are not listed in the tables, are either missing or received too late to be included in this issue.

Divisions, as used in "Climatological Data" Table and on the maps, became effective with data for August 1956.

Unless otherwise indicated, dimensional units used in this bulletin are: Temperature in °F. precipitation and evaporation in inches, and wind movement in siles, Monthly degree day totals are the sums of the negative departures of average daily temperatures from 65°F.

Evaporation is measured in the standard Weather Bureau type pan of 4 foot diameter unless otherwise shown by footnote following the "Evaporation and Tind" Table.

Long-term means for full-time stations (those shown in the Station Index as "U. S. Weather Bureau") are based on the period 1921-1950, adjusted to represect observations taken at the present location. Long-term means for all stations except full-time Weather Bureau stations are based on the period 1931-1955.

Water equivalent values published in the "Snowfall and Snow on Ground" Table are the water equivalent of snow, sleet, or ice on the ground. Samples for obtaining measurements are taken from different points for successive observations, consequently, occasional drifting and other causes of local variability in the snowpack result in apparent inconsistencies in the record.

Entries of snowfall in the "Climatological Data" Table and the "Snowfall and Snow on Ground" Table, and in the seasonal snowfall table include snow and sleet. Entries of snow on ground include snow, sleet and ice. Data in the "Daily rrecipitation" Table; "Da ily Temperature" Table; and "Evaporation and wind" Table, and snowfall in the "Snowfall and snow on Ground Table, when published, are for the 24 hours ending at time of observation. The station Index shows observation times in local standard time. During the sumber kostbs some observers take the observations on daylight saving time.

snow on ground in the "Snowfall and snow on Ground" Table is at observation time for all except Weather Bureau and CAA Stations. values are at 0600 C.S.T.

For those stations. S DOV OD ground

In the Station Index the letters C, H, and J in the "Special" column under the heading "Observation Time and Tables", indicate the following:

No record in the "Climatological Data" Table and the "Daily Temperature" Table is indicated by no entry.
Interpolated values for monthly precipitation totals may be found in the annual issue of this publication.
No record in the "Daily Precipitation Table; "Evaporation and wind" Table; "Snowfall and Snow on Ground" Table; and the station Index.
And also on an earlier date or dates. Amount included in following measurement, time distribution unknown.

Thermometers are generally exposed in a shelter located a few feet above sod-covered ground; however, the reference indicates that the

thermometers are exposed in a shelter located on the roof of a building.
Gage is equipped with a windshield.
This entry in time of observation column in Station Index means after rain.
Data based on observational day ending before noon. Adjusted to a full month.

Water equivalent of snowfall wholly or partly estimated, using a ratio of 1 inch water equivalent to every 10 inches of new snowfall.

One or more days of record missing; if average value is entered, less than 10 days record is missing. See "Daily Temperature" Table for detailed daily record. Degree day data, if carried for this station, have been adjusted to represent the value for a full month. Amounts from recording gage. (These amounts are essentially accurate but may vary slightly from the amounts to be published later in Hourly Precipitation Data.) This entry in time of observation column in Station Index means observation made near sunset. Trace, an amount too small to measure. Includes total for previous month.

Subscription Price: 20 cents per copy, monthly and annual; $2.50 per year. (Yearly subscription includes the Annual Summary.) Checks and money orders should be made payable to the Superintendent of Documents. Remittance and correspondence regarding subscriptions should be sent to the Superintendent of Documents, Government Printing Office, Washington 25, D. C.

General weather conditions in the U. S. for each month are described in the publications MONTHLY WEATHER REVIEW and the MONTHLY CLIMATOLOGICAL DATA, NATIONAL SUMMARY, either of which may be obtained from the Superintendent of Documents, Government Printing Office, Washington, D. C.

Information concerning the history of changes in locations, elevations, exposure, etc., of substations through 1955 may be found in the publication "Substation History" for this state. That publication may be obtained from the Superintendent of Documents, Government Printing Office, Washington 25, D. C. for 25 ceats. similar information for regular Weather Bureau stations may be found in the latest issues of Local Climatological Data Annual, obtained as indicated above, price 15 cents.

USCOM-WB-Asheville - 3-6-59--825