Portland, Maine1999 Climate Data
North America Region, US
Detailed temperature analysis for 1999 with 362 daily measurements across 12 months.
Avg: 48.7°F
12 Months
362 Records
Year Average
48.7°F
1999
Highest
83.2°F
Lowest
12.3°F
Range
70.9°F
Monthly Temperature Progression - 1999
32°F
24°F
Jan
29°F
Feb
36°F
Mar
45°F
Apr
55°F
May
66°F
Jun
71°F
Jul
68°F
Aug
64°F
Sep
48°F
Oct
43°F
Nov
32°F
Dec
Below Freezing
|32°F (0°C)|Above Freezing
Monthly Details - 1999
January 1999
Average:24.4°F
Range:12.3°F - 40.4°F
Days:28 days
Records:28
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February 1999
Average:29.4°F
Range:12.9°F - 42.7°F
Days:28 days
Records:28
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March 1999
Average:35.7°F
Range:17.2°F - 48.5°F
Days:31 days
Records:31
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April 1999
Average:45.3°F
Range:37.3°F - 52.2°F
Days:30 days
Records:30
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May 1999
Average:54.7°F
Range:47.2°F - 69.3°F
Days:31 days
Records:31
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June 1999
Average:66.4°F
Range:56.0°F - 76.0°F
Days:30 days
Records:30
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July 1999
Average:71.2°F
Range:63.5°F - 83.2°F
Days:31 days
Records:31
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August 1999
Average:67.7°F
Range:59.2°F - 79.4°F
Days:31 days
Records:31
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September 1999
Average:63.6°F
Range:52.6°F - 72.9°F
Days:30 days
Records:30
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October 1999
Average:47.6°F
Range:36.9°F - 60.0°F
Days:31 days
Records:31
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November 1999
Average:43.1°F
Range:30.3°F - 59.0°F
Days:30 days
Records:30
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December 1999
Average:32.1°F
Range:13.3°F - 49.2°F
Days:31 days
Records:31
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1999 Climate Summary
The year 1999 in Portland, Maine, US was characterized by an average temperature of 48.7°F, with temperatures ranging from a low of 12.3°F to a high of 83.2°F.
Temperature Analysis
- Annual Average: 48.7°F
- Temperature Extremes: 70.9°F range
- Data Coverage: 12 months with available observations
- Total Measurements: 362 daily records
Seasonal Patterns
January24.4°F
February29.4°F
March35.7°F
April45.3°F
... and 8 more months