Waltham (MA) monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Waltham

Waltham average temperature chart (Celsius) Waltham average temperature chart (Fahrenheit)
Average monthly temperatures in Waltham (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 0.6 2 7.2 13.6 19.9 24.8 27.6 26.5 22.2 16.6 10 3
°F 33 35.7 44.9 56.5 67.8 76.6 81.6 79.6 71.9 61.9 50 37.4

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Waltham monthly rainfall chart (mm) Waltham monthly rainfall chart (inches)
Average monthly rainfall in Waltham (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 96 92 101 98 90 81 82 91 90 91 119 109
inches 3.8 3.6 4 3.9 3.5 3.2 3.2 3.6 3.6 3.6 4.7 4.3
Rainy days 11 10 11 11 11 11 9 10 9 9 11 12

Average annual rainfall in Waltham: 1112.067mm (437.8 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Waltham

Waltham average daily sunshine chart
Average daily sunshine Waltham
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5.8 6.4 7.1 7.8 8.8 9.8 10.1 9.2 8.2 7 5.1 5.1

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Waltham average minimum / maximum temperatures (Celsius) Waltham average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Waltham (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -9.4 -8.3 -3 2.1 7.6 12.8 16 15.1 10.4 4.5 0.2 -6.3
Max °C 0.8 2.3 7.4 13.9 20.2 25.1 27.9 26.8 22.5 16.9 10.3 3.3
Min °F 15.1 17.1 26.6 35.8 45.7 55 60.7 59.1 50.6 40.1 32.3 20.8
Max °F 24.3 26.6 36 46.4 57 66 71.4 69.6 61.5 51.3 41.4 29.3

Sea temperature

The graph below shows the average sea temperature.

Waltham average sea temperature chart (Celsius) Waltham average sea temperature chart (Fahrenheit)
Average sea temperature around Waltham in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 5.4 3.8 3.5 5.2 9.1 14 18.6 19.8 17.8 14.2 10.7 7.9
°F 41.8 38.8 38.3 41.4 48.4 57.3 65.4 67.7 64.1 57.6 51.3 46.2

Wind speed

The graph below shows the average wind speed.

Waltham average winspeed by month (km/h) Waltham average winspeed by month (mph)
Average wind speed in Waltham (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 18 18 19 18 16 15 14 14 14 15 17 17
mph 11 11 12 11 10 9 9 9 9 9 10 11

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Waltham relative humidity averages
Average relative humidity in Waltham
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
64% 63% 63% 61% 66% 69% 69% 72% 73% 70% 69% 67%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

Waltham weather stats

Waltham weather statistics
Hottest month: July 27.6°C 81.7°F
Driest month: June 81mm 3.2ins
Sunniest month: July 10.1hrs
Coldest month: January 0.6°C 33.1°F
Wettest month: November 119mm 4.7ins
Warmest sea: August 19.8°C 67.6°F
Map showing location of Waltham (42.37649, -71.23561) Waltham map pin © Google

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