Weather History for Lancaster, PA

Change the Weather History Date:

Month of December, 1999

  Max Avg Min Sum
Temperature  
Max Temperature 64 °F 44 °F 27 °F
Mean Temperature 52 °F 36 °F 20 °F
Min Temperature 46 °F 28 °F 12 °F
Degree Days  
Heating Degree Days (base 65) 45 29 14 861
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 2 0 0 4
Dew Point  
Dew Point 54 °F 26 °F 4 °F
Precipitation  
Precipitation 1.02 in 0.09 in 0.00 in 2.84 in
Snowdepth - - - -
Wind  
Wind 30 mph 7 mph 0 mph
Gust Wind 39 mph 25 mph 17 mph
Sea Level Pressure  
Sea Level Pressure 30.51 in 30.10 in 29.61 in

Monthly Weather History Graph

Monthly Weather History Graph

Search for Another Location

Airport:

Trip Planner

Search our weather history database for the weather conditions in past years. The results will help you decide how hot, cold, wet, or windy it might be!

Date:

Astronomy

Dec. 31, 1999 Rise Set
Actual Time 7:27 AM EST 4:49 PM EST
Civil Twilight 6:56 AM EST 5:19 PM EST
Nautical Twilight 6:22 AM EST 5:53 PM EST
Astronomical Twilight 5:49 AM EST 6:26 PM EST
Moon 1:42 AM EST (12/31) 1:14 PM EST (12/31)
Length of Visible Light 10h 22m
Length of Day
9h 21m
Waning Crescent, 30% of the Moon is Illuminated
Dec 31
Waning Crescent
Jan 6
New
Jan 14
First Quarter
Jan 20
Full
Jan 28
Last Quarter

Weather History Calendar

Precipitation Actual month total 2.84 Average Month Total: 2.93
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Clear
Actual:
35 | 21 0.00
Average:
46 | 30 0.13
Clear
Actual:
45 | 23 0.00
Average:
47 | 30 0.12
Clear
Actual:
52 | 28 0.00
Average:
47 | 28 0.14
Rain
Actual:
62 | 37 0.02
Average:
48 | 30 0.16
Fog
Actual:
64 | 39 0.01
Average:
45 | 30 0.14
Rain
Actual:
57 | 46 0.73
Average:
44 | 30 0.05
Partly Cloudy
Actual:
48 | 30 0.00
Average:
46 | 30 0.01
Clear
Actual:
46 | 27 0.00
Average:
46 | 29 0.03
Scattered Clouds
Actual:
51 | 28 0.00
Average:
45 | 26 0.17
Rain
Actual:
53 | 35 0.41
Average:
42 | 25 0.08
Clear
Actual:
45 | 32 0.00
Average:
43 | 27 0.02
Clear
Actual:
46 | 27 0.00
Average:
42 | 26 0.13
Rain
Actual:
42 | 28 0.27
Average:
43 | 26 0.14
Rain
Actual:
42 | 37 1.02
Average:
43 | 25 0.12
Mostly Cloudy
Actual:
44 | 33 0.00
Average:
45 | 26 0.11
Snow
Actual:
44 | 30 0.01
Average:
43 | 25 0.11
Scattered Clouds
Actual:
42 | 27 0.00
Average:
42 | 27 0.14
Partly Cloudy
Actual:
42 | 32 0.00
Average:
40 | 24 0.19
Partly Cloudy
Actual:
42 | 28 0.00
Average:
39 | 23 0.04
Rain
Actual:
44 | 33 0.37
Average:
39 | 24 0.03
Fog
Actual:
41 | 32 0.00
Average:
39 | 23 0.15
Partly Cloudy
Actual:
36 | 25 0.00
Average:
41 | 23 0.08
Partly Cloudy
Actual:
39 | 21 0.00
Average:
43 | 23 0.05
Clear
Actual:
27 | 16 0.00
Average:
41 | 23 0.06
Clear
Actual:
28 | 12 0.00
Average:
41 | 22 0.25
Partly Cloudy
Actual:
36 | 21 0.00
Average:
36 | 20 0.00
Overcast
Actual:
34 | 28 0.00
Average:
35 | 19 0.04
Snow
Actual:
30 | 19 0.00
Average:
37 | 24 0.10
Scattered Clouds
Actual:
46 | 23 0.00
Average:
38 | 24 0.06
Rain
Actual:
62 | 28 0.00
Average:
38 | 24 0.02
Partly Cloudy
Actual:
- | - 0.00
Average:
38 | 22 0.06
 

Calendar Legend

Sunny
Clear
Mostly Cloudy
Partly Sunny
Partly Cloudy
Mostly Sunny
Cloudy Rain Snow
Hail
Flurries
Thunderstorms Hazy
Fog
Sleet '?' denotes
'chance of'
Unknown

Daily Weather History & Observations

1999 Temp. (°F) Dew Point (°F) Humidity (%) Sea Level Press. (in) Visibility (mi) Wind (mph) Precip. (in) Events
Dec high avg low high avg low high avg low high avg low high avg low high avg high sum  
1 35 28 21 13 8 4 58 45 30 30.51 30.42 30.35 10 10 10 22 12 28 0.00  
2 45 34 23 21 17 13 77 53 30 30.38 30.30 30.22 10 10 10 10 6 - 0.00  
3 52 40 28 33 28 22 86 66 36 30.25 30.20 30.16 10 8 3 5 1 - 0.00  
4 62 50 37 48 42 32 96 77 58 30.22 30.16 30.09 10 7 3 18 4 - 0.02 Rain
5 64 52 39 50 43 39 100 86 52 30.21 30.11 29.94 10 5 0 12 4 - 0.01 Fog
6 57 52 46 54 49 37 100 88 68 29.96 29.88 29.83 10 5 1 15 4 - 0.73 Rain
7 48 40 30 36 31 26 82 67 46 30.32 30.16 29.96 10 10 10 18 13 22 0.00  
8 46 36 27 32 29 24 92 76 56 30.42 30.38 30.32 10 8 3 8 5 - 0.00  
9 51 40 28 38 31 27 100 84 56 30.42 30.34 30.16 10 4 1 8 1 - 0.00  
10 53 44 35 51 41 22 100 87 49 30.13 29.89 29.74 10 5 1 30 8 39 0.41 Rain
11 45 38 32 25 24 23 73 56 44 30.14 30.09 29.99 10 10 10 25 17 33 0.00  
12 46 36 27 26 24 22 82 65 37 30.22 30.14 30.10 10 10 10 13 7 - 0.00  
13 42 35 28 40 34 23 97 89 76 30.10 30.06 30.01 10 5 1 10 5 - 0.27 Rain
14 42 40 37 39 37 36 100 92 85 30.07 29.93 29.76 10 6 1 24 11 32 1.02 Rain
15 44 38 33 43 39 34 100 95 87 30.11 30.03 29.92 7 4 2 15 5 - 0.00  
16 44 37 30 43 33 22 100 76 47 30.09 29.95 29.89 10 7 2 23 9 30 0.01 Snow
17 42 34 27 28 21 15 82 60 34 30.21 30.16 30.07 10 10 10 18 8 24 0.00  
18 42 38 32 29 27 23 82 68 53 30.36 30.27 30.17 10 10 9 9 3 - 0.00  
19 42 35 28 28 24 22 79 66 47 30.44 30.38 30.34 10 10 10 12 7 - 0.00  
20 44 38 33 43 37 27 100 91 70 30.35 30.12 29.97 10 5 1 15 9 - 0.37 Rain
21 41 36 32 40 28 13 100 79 42 30.23 30.12 30.00 10 6 0 20 7 - 0.00 Fog
22 36 30 25 23 14 7 78 52 31 30.33 30.26 30.20 10 10 10 17 8 21 0.00  
23 39 30 21 24 18 10 88 62 45 30.32 30.21 30.08 10 10 10 21 6 25 0.00  
24 27 22 16 11 7 4 74 54 39 30.34 30.24 30.18 10 10 10 15 8 22 0.00  
25 28 20 12 12 9 5 81 61 47 30.41 30.31 30.13 10 10 10 14 8 - 0.00  
26 36 28 21 22 14 8 60 52 42 30.09 29.79 29.66 10 10 10 21 9 30 0.00  
27 34 31 28 18 15 13 61 54 44 29.86 29.82 29.76 10 10 10 20 14 26 0.00  
28 30 24 19 25 17 11 93 71 45 29.87 29.72 29.61 10 8 1 10 7 - 0.00 Snow
29 46 34 23 23 16 13 88 53 27 29.91 29.81 29.62 10 10 7 15 11 23 0.00  
30 62 45 28 31 24 17 68 45 25 29.95 29.85 29.77 10 9 6 7 3 - 0.00 Rain
31 - - - - - - - - - 30.19 30.07 29.94 6 4 1 8 4 - 0.00