National Weather Service United States Department of Commerce

Sunday Brings Heat Relief For Some; Flash Flood Threat Along Cold Front

A cold front shifting across the Central Plains, Midwest, Great Lakes and Northeast on Sunday will bring some relief from the heat with cooler and drier air. Excessive heat holds Sunday roughly south of I-70. Heavy rain from thunderstorms along the front may bring flash flooding. Read More >

Duluth and International Falls April Climate Summary
and May Climate Outlook
THE DULUTH MN CLIMATE SUMMARY FOR THE MONTH OF APRIL 2016
CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1870 TO 2016

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              88   04/27/1952
 LOW               -5   04/04/1975
                        04/03/1954
HIGHEST            71   04/16        MM      MM       76  04/12
LOWEST              2   04/09        MM      MM       22  04/05
AVG. MAXIMUM     45.7              49.2    -3.5     52.4
AVG. MINIMUM     29.8              30.0    -0.2     32.1
MEAN             37.7              39.6    -1.9     42.2
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      5               1.5     3.5        0
DAYS MIN <= 32     19              17.8     1.2       18
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         8.18   2001
 MINIMUM         0.24   1987
TOTALS           2.40              2.43   -0.03     1.03
DAILY AVG.       0.08              0.08    0.00     0.03
DAYS >= .01        10              10.6    -0.6        7
DAYS >= .10         5               5.5    -0.5        2
DAYS >= .50         1               1.6    -0.6        1
DAYS >= 1.00        1               0.3     0.7        0
GREATEST
 24 HR. TOTAL    1.51                            04/19 TO 04/19

SNOWFALL (INCHES)
RECORDS
 TOTAL           26.3   2014
TOTALS            9.8               6.9     2.9      1.2
SINCE 7/1        81.3              85.7    -4.4     49.2
SNOWDEPTH AVG.      1                MM      MM        0
DAYS >= 1.0         4               1.8     2.2        0
GREATEST
 SNOW DEPTH         4   04/02                          1  04/21
                                                          04/20
 24 HR TOTAL      3.3   04/02 TO 04/02

DEGREE_DAYS
HEATING TOTAL     809               762      47      675
 SINCE 7/1       7674              8839   -1165     8573
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0        0
..........................................................

WIND (MPH)
AVERAGE WIND SPEED              12.1
HIGHEST WIND SPEED/DIRECTION    35/080    DATE  04/25
HIGHEST GUST SPEED/DIRECTION    47/090    DATE  04/25

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            6
NUMBER OF DAYS PC             17
NUMBER OF DAYS CLOUDY          7

AVERAGE RH (PERCENT)     65

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               1
HEAVY RAIN                2     RAIN                       2
LIGHT RAIN                7     FREEZING RAIN              0
LT FREEZING RAIN          3     HAIL                       0
HEAVY SNOW                1     SNOW                       4
LIGHT SNOW               12     SLEET                      1
FOG                      13     FOG W/VIS <= 1/4 MILE      4
HAZE                      5

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

APRIL 2016 WAS COOLER WITH NEAR NORMAL PRECIPITATION AT DULUTH MN

THE AVERAGE TEMPERATURE FOR APRIL WAS 37.7 DEGREES WHICH WAS 1.9
DEGREES BELOW THE NORMAL OF 39.6 DEGREES MAKING THIS THE 31ST
COOLEST APRIL IN STATION HISTORY. THE HIGHEST TEMPERATURE FOR THE
MONTH WAS 71 DEGREES ON THE 16TH. THE LOWEST TEMPERATURE WAS 2
DEGREES ON THE 9TH. ONE DAILY TEMPERATURE RECORD WAS BROKEN FOR THE
MONTH. THE RECORD LOW TEMPERATURE OF 2 DEGREES WAS RECORDED ON THE
9TH. THIS BREAKS THE OLD RECORD OF 6 DEGREES SET IN 2007. TWENTY ONE
DAYS HAD AVERAGE TEMPERATURES BELOW NORMAL.

APRIL 2016 WAS NEAR NORMAL FOR PRECIPITATION WITH A TOTAL OF 2.40
INCHES OF PRECIPITATION RECORDED FOR THE MONTH. THIS WAS 0.03 INCHES
BELOW THE NORMAL OF 2.43 INCHES. THE GREATEST AMOUNT OF
PRECIPITATION IN A 24 HOUR PERIOD OCCURRED ON THE 24TH TO THE 25TH
WHEN 1.51 INCHES WAS RECORDED. AT LEAST A TRACE OF PRECIPITATION WAS
RECORDED ON 20 DAYS. AT LEAST 0.01 INCHES OF PRECIPITATION FELL ON
10 DAYS. AT LEAST 0.10 INCHES FELL ON 5 DAYS. AT LEAST 0.50 INCHES
FELL ON 1 DAY. AT LEAST 1.00 INCHES FELL ON 1 DAY. THERE WAS 9.8
INCHES OF SNOW FOR THE MONTH WHICH IS 2.9 INCHES ABOVE THE NORMAL OF
6.9 INCHES WHICH MADE IT THE 25TH SNOWIEST APRIL IN STATION HISTORY.
THE GREATEST AMOUNT OF SNOWFALL IN A 24 HOUR PERIOD OCCURRED ON THE
2ND WHERE 3.3 INCHES OF SNOW WAS RECORDED. NO DAILY PRECIPITATION
RECORDS WERE BROKEN FOR THE MONTH.

THE AVERAGE WIND SPEED FOR THE MONTH WAS 12.1 MPH. THE WINDIEST DAY
OF THE MONTH WAS ON THE 25TH WITH AN AVERAGE WIND OF 25.3 MPH. THE
HIGHEST SUSTAINED WIND OCCURRED ON THE 25TH WITH A WIND FROM THE
EAST AT 35 MPH. A PEAK WIND GUST OF 47 MPH WAS RECORDED ON THE 25TH.
THERE WERE 809 HEATING DEGREE DAYS FOR THE MONTH WHICH WAS 47 ABOVE
THE NORMAL OF 762. THIS BROUGHT THE SEASONAL TOTAL TO 7674 WHICH WAS
1165 BELOW THE NORMAL OF 8839. THERE WERE 0 COOLING DEGREE DAYS FOR
THE MONTH WHICH WAS NORMAL. THE SEASONAL TOTAL COOLING DEGREE DAYS
STANDS AT 0 WHICH WAS NORMAL. THE HIGHEST SEA LEVEL PRESSURE FOR THE
MONTH WAS 30.46 INCHES REACHED ON THE 18TH AND THE LOWEST SEA LEVEL
PRESSURE READING WAS 29.53 INCHES REACHED ON THE 2ND.

THE INTERNATIONAL FALLS MN CLIMATE SUMMARY FOR THE MONTH OF APRIL 2016
CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1895 TO 2016

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              93   04/27/1952
 LOW              -14   04/03/1954
HIGHEST            77   04/16        MM      MM       72  04/17
                                                          04/15
LOWEST              6   04/09        MM      MM        7  04/05
AVG. MAXIMUM     47.9              51.5    -3.6     53.3
AVG. MINIMUM     26.6              27.1    -0.5     25.6
MEAN             37.3              39.3    -2.0     39.5
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      5               1.5     3.5        2
DAYS MIN <= 32     20              21.8    -1.8       25
DAYS MIN <= 0       0               0.2    -0.2        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.53   1925
 MINIMUM         0.08   1987
TOTALS           2.11              1.53    0.58     0.72
DAILY AVG.       0.07              0.05    0.02     0.02
DAYS >= .01        15               8.7     6.3        6
DAYS >= .10         5               4.1     0.9        2
DAYS >= .50         1               0.8     0.2        0
DAYS >= 1.00        0               0.1    -0.1        0
GREATEST
 24 HR. TOTAL    0.80   04/25 TO 04/25

SNOWFALL (INCHES)
RECORDS
 TOTAL           23.5   2008
TOTALS            4.9               6.4    -1.5      4.3
SINCE 7/1        47.7              70.8   -23.1     64.5
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         1               1.7    -0.7        2
GREATEST
 SNOW DEPTH         3   04/06                          2  04/22
                                                          04/08
                                                          04/07
 24 HR TOTAL      2.4   04/05 TO 04/05

DEGREE_DAYS
HEATING TOTAL     826               772      54      759
 SINCE 7/1       8461              9638   -1177     9682
COOLING TOTAL       0                 1      -1        0
 SINCE 1/1          0                 1      -1        0
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              8.2
HIGHEST WIND SPEED/DIRECTION    28/100    DATE  04/25
HIGHEST GUST SPEED/DIRECTION    36/090    DATE  04/25

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR           11
NUMBER OF DAYS PC              6
NUMBER OF DAYS CLOUDY         13

AVERAGE RH (PERCENT)     64

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               1
HEAVY RAIN                2     RAIN                       4
LIGHT RAIN                8     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                1     SNOW                       5
LIGHT SNOW                9     SLEET                      0
FOG                      13     FOG W/VIS <= 1/4 MILE      2
HAZE                     12

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

APRIL 2016 WAS COOLER AND WETTER THAN NORMAL AT INTERNATIONAL FALLS MN

THE AVERAGE TEMPERATURE FOR APRIL WAS 37.3 DEGREES WHICH WAS 2.0
DEGREES ABOVE THE NORMAL OF 39.3 DEGREES MAKING THIS THE 40TH
WARMEST APRIL IN STATION HISTORY. THE HIGHEST TEMPERATURE FOR THE
MONTH WAS 77 DEGREES ON THE 16TH. THE LOWEST TEMPERATURE WAS 6
DEGREES ON THE 9TH. NO DAILY TEMPERATURE RECORDS WERE BROKEN FOR THE
MONTH. TWENTY ONE DAYS HAD AVERAGE TEMPERATURES BELOW NORMAL.

APRIL 2016 WAS WETTER THAN NORMAL WITH A TOTAL OF 2.11 INCHES OF
PRECIPITATION RECORDED FOR THE MONTH. THIS WAS 0.58 INCHES ABOVE THE
NORMAL OF 1.53 INCHES MAKING THIS THE 22ND WETTEST APRIL IN RECORDED
HISTORY. THE GREATEST AMOUNT OF PRECIPITATION IN A 24 HOUR PERIOD
OCCURRED ON THE 25TH WHEN 0.80 INCHES WAS RECORDED. AT LEAST A TRACE
OF PRECIPITATION WAS RECORDED ON 19 DAYS. AT LEAST 0.01 OF AN INCH
OF PRECIPITATION FELL ON 15 DAYS. AT LEAST 0.10 OF AN INCH FELL ON 5
DAYS. AT LEAST 0.50 OF AN INCH FELL ON 1 DAY. THERE WAS 4.9 INCHES
OF SNOW FOR THE MONTH WHICH IS 1.5 INCHES BELOW THE NORMAL OF 6.4
INCHES WHICH MADE IT THE 23RD LEAST SNOWIEST APRIL IN STATION
HISTORY. THE GREATEST AMOUNT OF SNOWFALL IN A 24 HOUR PERIOD
OCCURRED ON THE 5TH WHERE 2.4 INCHES OF SNOW WAS RECORDED. NO DAILY
PRECIPITATION RECORDS WERE BROKEN FOR THE MONTH.

THE AVERAGE WIND SPEED FOR THE MONTH WAS 8.2 MPH. THE WINDIEST DAY
FOR THE MONTH WAS ON THE 25TH WITH AN AVERAGE WIND OF 13.4 MPH. THE
HIGHEST SUSTAINED WIND OCCURRED ON THE 25TH WITH A SPEED OF 28 MPH
OUT OF THE EAST. A PEAK GUST OF 36 MPH FROM THE EAST WAS RECORDED ON
THE 25TH. THERE WERE 826 HEATING DEGREE DAYS FOR THE MONTH WHICH WAS
54 ABOVE THE NORMAL OF 772. THIS BROUGHT THE SEASONAL TOTAL TO 8461
WHICH WAS 1177 BELOW THE NORMAL OF 9638. THERE WERE 0 COOLING DEGREE
DAYS FOR THE MONTH WHICH WAS 1 BELOW THE NORMAL OF 1. THE SEASONAL
TOTAL COOLING DEGREE DAYS STANDS AT 0 WHICH IS NEAR NORMAL. THE
HIGHEST SEA LEVEL PRESSURE READING FOR THE MONTH WAS 30.51 INCHES
REACHED ON THE 18TH AND THE LOWEST SEA LEVEL PRESSURE READING WAS
29.50 INCHES REACHED ON THE 10TH.

THE OUTLOOK FOR MAY...NORMAL HIGHS BEGIN THE MONTH IN THE LOW 60S
AND WARM TO THE UPPER 60S AT THE END OF THE MONTH. NORMAL LOWS FOR
THE MONTH START IN THE MID 30S AND WARM TO THE MID 40S AT THE END OF
THE MONTH. NORMAL PRECIPITATION FOR MAY IS 2.86 INCHES. ABOVE
AVERAGE TEMPERATURES AND BELOW NORMAL PRECIPITATION ARE FORECASTED
FOR MAY.

 

May Climate Outlook

Temperature Outlook Precipitation Outlook
NORMAL HIGHS FOR DULUTH START IN THE MID TO UPPER 50S AND WARM TO THE MID
60S AT THE END OF THE MONTH. NORMAL LOWS FOR THE MONTH START IN THE MID 30S
AND WARM TO THE MID 40S AT THE END OF THE MONTH. NORMAL PRECIPITATION FOR
MAY IS 3.23 INCHES. 
NORMAL HIGHS FOR INTERNATIONAL FALLS START IN THE LOW 60S AND WARM TO THE
UPPER 60S AT THE END OF THE MONTH. NORMAL LOWS FOR NONTH START IN THE MID
30S AND WARM TO THE MID 40S AT THE END OF THE MONTH. NORMAL PRECIPITATION
FOR MAY IS 2.86 INCHES. 
FOR BOTH LOCATIONS ABOVE AVERAGE TEMPERATURES AND BELOW NORMAL
PRECIPITATION ARE FORECASTED FOR MAY.

 

Duluth, MN

Normals for the Month of May 
(The monthly climate normals are from a 30 year period defined by the Climate Prediction Center as 1981-2010)

The Normal, Monthly Average Temperature (degrees F)

51.4

The Normal, Monthly High Temperature (degrees F)

62.2

The Normal, Monthly Low Temperature (degrees F)

40.6

 

 

Normal Monthly Precipitation (inches)

3.23

Normal Monthly Snowfall (inches)

0.4

 

 

Normal number of days with Measurable Precipitation

12.3

Normal number of days with snow depth of 1 inch or greater

0.1

 

 

Normal Heating Degree Days

426

Normal Cooling Degree Days

4

 

Records for the Month of May

Warmest Month (Monthly Average Temperature)

57.4 in 1977

Coldest  Month (Monthly Average Temperature)

38.8 in 1907

Highest Observed Temperature (degrees F)

95 on the 30th in 1939

Lowest Observed High Temperature (degrees F)

27 on the 3rd in 1954

Lowest Observed Temperature (degrees F)

16 on the 3rd in 1907

Highest Observed Low Temperature (degrees F)

42 on the 10th in 1927

 

 

Greatest Monthly Precipitation (inches)

7.99 in 1879

Least Monthly  Precipitation (inches)

0.15 in 1976

Greatest Daily Precipitation (inches)

3.93 on the 23rd in 2010

 

 

Greatest Monthly Snowfall (inches)

8.1 in 1954

Least Monthly Snowfall (inches)

0 in multiple years

Greatest Daily Snowfall (inches)

5.5 on the 10th in 1902

Greatest Measured Snow Depth (inches)

9 on the 1st to 3rd in 1950

 

 

Greatest Measured Wind Speed (mph)

61 on the 12th in 1959

 

 

International Falls, MN

Normals for the Month of May
(The monthly climate normals are from a 30 year period defined by the Climate Prediction Center as 1981-2010)

  The Normal, Monthly Average Temperature (degrees F)

51.8

  The Normal, Monthly High Temperature (degrees F)

64.8

  The Normal, Monthly Low Temperature (degrees F)

38.7

 

 

  Normal Monthly Precipitation (inches)

2.86

  Normal Monthly Snowfall (inches)

0.2

 

 

  Normal number of days with Measurable Precipitation

12.4

  Normal number of days with snow depth of 1 inch or greater

4.5

 

 

  Normal Heating Degree Days

419

  Normal Cooling Degree Days

8

 

Records for the Month of May

  Warmest Month (Monthly Average Temperature)

60.9 in 1977

  Coldest  Month (Monthly Average Temperature)

43.0 in 1924

  Highest Observed Temperature (degrees F)

95 on the 21st in 1964

  Lowest Observed High Temperature (degrees F)

26 on the 2nd in 1967

  Lowest Observed Temperature (degrees F)

8 on the 17th in 1926

  Highest Observed Low Temperature (degrees F)

66 on the 31st in 1988 & on the 21st in 1992

 

 

  Greatest Monthly Precipitation (inches)

6.67 in 1985

  Least Monthly  Precipitation (inches)

0.07 in 1917

  Greatest Daily Precipitation (inches)

2.67 on the 23rd in 1991

 

 

  Greatest Monthly Snowfall (inches)

13.4 in 1954

  Least Monthly Snowfall (inches)

0 in multiple years

  Greatest Daily Snowfall (inches)

8.0 on 5th 1925

  Greatest Measured Snow Depth (inches)

12 on the 4th-5th in 1954

 

 

  Greatest Measured Wind Speed (mph)

58 on the 24th in 1989