Trap Pond State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Trap Pond State Park clear sky chart from 2005-11-06 to 2024-11-05.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	14% 6% 2 6% 4 4 4 4 6% 8% 41%	101170
	Night	15% 7% 2 6% 4 4 4 3 5% 7% 43%	97815
Transparency	Day	22% 48% 7% 13% 9% 2	104787
	Night	22% 48% 6% 13% 9% 2	102337
Seeing	Day	16% 12% 29% 25% 14% 4	15150
	Night	17% 10% 29% 31% 13% 1	24513

By Month

Percentage Cloud Cover SE (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	15% 6% 2 5% 3 3 4 3 4 6% 49%	2517
	11th to 20th	Day	16% 8% 3 8% 5% 4 3 3 4 6% 42%	2726
	21st to end	Day	17% 10% 3 8% 5% 4 4 3 4 5% 37%	3124
February	1st to 10th	Day	14% 7% 2 7% 5% 4 5% 4 6% 7% 39%	1710
	11th to 20th	Day	17% 7% 2 4 3 4 4 3 5% 5% 45%	1829
	21st to end	Day	17% 9% 3 7% 5% 4 3 4 4 7% 38%	1570
March	1st to 10th	Day	24% 8% 2 5% 3 2 3 3 4 7% 39%	3173
	11th to 20th	Day	10% 4 1 4 3 3 3 3 6% 8% 54%	3480
	21st to end	Day	19% 9% 2 6% 4 3 4 3 4 6% 41%	4023
April	1st to 10th	Day	14% 6% 2 5% 4 3 4 3 5% 6% 47%	2280
	11th to 20th	Day	12% 5% 2 5% 4 3 4 3 5% 7% 49%	2254
	21st to end	Day	15% 7% 2 5% 3 3 3 4 4 9% 43%	2280
May	1st to 10th	Day	20% 9% 3 7% 5% 4 4 4 6% 8% 30%	3849
	11th to 20th	Day	23% 9% 2 7% 4 4 4 4 5% 6% 32%	4384
	21st to end	Day	10% 5% 2 5% 5% 4 5% 4 7% 9% 45%	4823
June	1st to 10th	Day	11% 5% 2 5% 5% 5% 4 5% 8% 10% 40%	2660
	11th to 20th	Day	11% 5% 2 5% 5% 4 4 5% 6% 10% 43%	2660
	21st to end	Day	9% 5% 2 5% 5% 4 5% 5% 7% 11% 44%	2660
July	1st to 10th	Day	7% 4 2 6% 5% 5% 5% 5% 8% 13% 40%	4440
	11th to 20th	Day	11% 6% 2 7% 5% 5% 5% 5% 8% 10% 37%	4440
	21st to end	Day	9% 5% 3 7% 6% 6% 7% 6% 8% 10% 32%	4564
August	1st to 10th	Day	15% 7% 2 6% 4 5% 6% 5% 8% 11% 31%	4052
	11th to 20th	Day	9% 6% 3 7% 6% 5% 6% 5% 7% 10% 39%	3730
	21st to end	Day	8% 5% 1 6% 5% 5% 4 4 6% 9% 46%	4180
September	1st to 10th	Day	13% 5% 2 6% 5% 5% 5% 4 6% 6% 42%	2280
	11th to 20th	Day	11% 6% 2 6% 4 5% 4 4 5% 7% 45%	2256
	21st to end	Day	19% 7% 3 6% 4 4 4 4 6% 5% 38%	2085
October	1st to 10th	Day	16% 6% 2 6% 4 4 4 4 5% 6% 43%	1900
	11th to 20th	Day	17% 5% 2 3 3 3 3 3 4 4 52%	1900
	21st to end	Day	14% 6% 3 5% 3 4 3 3 4 5% 50%	2077
November	1st to 10th	Day	13% 5% 1 5% 4 3 3 3 5% 7% 51%	1708
	11th to 20th	Day	13% 6% 2 5% 4 4 4 3 5% 5% 49%	1710
	21st to end	Day	15% 4 2 6% 3 4 3 3 4 6% 48%	1644
December	1st to 10th	Day	16% 6% 2 6% 5% 3 4 3 6% 8% 41%	1520
	11th to 20th	Day	16% 9% 3 6% 3 3 3 2 4 4 46%	1910
	21st to end	Day	16% 7% 2 6% 3 4 4 4 5% 7% 43%	2772
January	1st to 10th	Night	14% 8% 3 5% 3 3 4 4 5% 6% 46%	4429
	11th to 20th	Night	18% 8% 2 6% 4 3 3 3 3 5% 46%	4216
	21st to end	Night	19% 10% 3 6% 4 3 4 3 3 4 41%	4532
February	1st to 10th	Night	16% 7% 3 5% 3 3 4 4 5% 7% 43%	2470
	11th to 20th	Night	18% 8% 3 5% 4 4 3 3 4 6% 43%	2236
	21st to end	Night	18% 7% 2 4 3 4 3 3 4 6% 45%	1884
March	1st to 10th	Night	22% 10% 3 6% 4 3 3 3 4 5% 37%	3675
	11th to 20th	Night	14% 5% 2 4 3 4 3 4 5% 8% 47%	3480
	21st to end	Night	18% 10% 3 6% 4 3 3 2 4 4 43%	3608
April	1st to 10th	Night	17% 7% 2 5% 4 4 4 4 5% 6% 41%	1900
	11th to 20th	Night	11% 6% 2 6% 4 4 4 3 5% 6% 47%	1875
	21st to end	Night	17% 5% 2 5% 4 5% 4 4 6% 7% 42%	1900
May	1st to 10th	Night	18% 9% 3 9% 5% 5% 4 4 5% 6% 32%	3044
	11th to 20th	Night	23% 10% 3 7% 4 4 4 4 5% 6% 32%	2538
	21st to end	Night	11% 6% 2 7% 4 5% 4 4 6% 9% 41%	2732
June	1st to 10th	Night	12% 7% 3 5% 4 5% 5% 5% 6% 7% 41%	1520
	11th to 20th	Night	10% 5% 2 6% 6% 5% 5% 4 6% 9% 42%	1520
	21st to end	Night	8% 5% 2 7% 5% 4 6% 4 8% 11% 40%	1520
July	1st to 10th	Night	8% 5% 2 7% 5% 6% 5% 5% 8% 11% 38%	2520
	11th to 20th	Night	9% 6% 2 7% 5% 4 5% 5% 6% 11% 40%	2520
	21st to end	Night	12% 9% 4 8% 6% 5% 5% 4 6% 9% 34%	2985
August	1st to 10th	Night	17% 7% 4 8% 5% 4 4 4 5% 9% 33%	2845
	11th to 20th	Night	9% 7% 3 7% 5% 5% 5% 4 6% 10% 41%	3097
	21st to end	Night	8% 6% 2 5% 4 3 4 3 5% 8% 53%	3476
September	1st to 10th	Night	14% 7% 2 5% 4 4 3 3 5% 7% 46%	1900
	11th to 20th	Night	10% 5% 2 5% 4 4 3 3 6% 8% 49%	1922
	21st to end	Night	20% 8% 2 5% 5% 4 4 4 5% 7% 37%	2093
October	1st to 10th	Night	16% 7% 2 5% 4 3 3 3 4 7% 46%	2280
	11th to 20th	Night	16% 5% 2 5% 3 3 3 3 4 5% 52%	2280
	21st to end	Night	14% 7% 3 4 3 3 3 3 4 6% 49%	2518
November	1st to 10th	Night	11% 6% 3 6% 4 3 3 2 4 5% 52%	2470
	11th to 20th	Night	14% 7% 2 6% 4 3 3 3 4 5% 48%	2470
	21st to end	Night	12% 6% 2 4 4 3 3 3 5% 6% 51%	2531
December	1st to 10th	Night	17% 8% 3 6% 4 3 3 3 6% 6% 40%	2660
	11th to 20th	Night	18% 7% 2 5% 5% 3 3 3 4 6% 44%	3285
	21st to end	Night	14% 7% 3 7% 5% 4 4 4 5% 7% 39%	4884

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	22% 38% 5% 21% 11% 3	2518
	11th to 20th	Day	28% 38% 6% 13% 12% 4	2726
	21st to end	Day	33% 43% 6% 11% 6% 1	3124
February	1st to 10th	Day	16% 66% 6% 7% 4 1	1710
	11th to 20th	Day	16% 64% 3 8% 7% 2	1838
	21st to end	Day	18% 66% 5% 5% 6% 1	1570
March	1st to 10th	Day	33% 41% 4 12% 7% 3	3173
	11th to 20th	Day	12% 42% 7% 22% 15% 2	3480
	21st to end	Day	27% 41% 6% 10% 13% 4	4023
April	1st to 10th	Day	15% 66% 3 8% 6% 1	2280
	11th to 20th	Day	13% 67% 4 9% 7% 1	2254
	21st to end	Day	14% 65% 5% 8% 6% 1	2280
May	1st to 10th	Day	36% 44% 6% 10% 3 1	3884
	11th to 20th	Day	35% 44% 8% 12% 2	4388
	21st to end	Day	18% 44% 9% 14% 13% 2	4837
June	1st to 10th	Day	15% 67% 4 8% 6% 1	2660
	11th to 20th	Day	10% 67% 6% 9% 8% 1	2660
	21st to end	Day	10% 65% 7% 9% 8% 1	2660
July	1st to 10th	Day	21% 42% 17% 11% 7% 1	4370
	11th to 20th	Day	29% 38% 12% 16% 3	4365
	21st to end	Day	30% 40% 9% 12% 8% 1	4418
August	1st to 10th	Day	30% 40% 12% 15% 3	4039
	11th to 20th	Day	23% 40% 8% 23% 6%	3766
	21st to end	Day	19% 38% 8% 21% 13% 1	4180
September	1st to 10th	Day	16% 62% 8% 7% 7% 1	2280
	11th to 20th	Day	17% 61% 5% 8% 7% 2	2256
	21st to end	Day	23% 60% 3 9% 3 1	2085
October	1st to 10th	Day	20% 38% 5% 15% 18% 4	3160
	11th to 20th	Day	12% 37% 4 17% 22% 8%	3140
	21st to end	Day	10% 36% 7% 21% 17% 9%	3403
November	1st to 10th	Day	15% 57% 5% 12% 7% 3	1708
	11th to 20th	Day	14% 60% 4 8% 12% 3	1710
	21st to end	Day	14% 60% 3 15% 7% 1	1644
December	1st to 10th	Day	21% 60% 5% 8% 4 2	1520
	11th to 20th	Day	21% 48% 4 17% 7% 3	1906
	21st to end	Day	23% 42% 12% 14% 9%	2772
January	1st to 10th	Night	24% 39% 6% 16% 12% 3	4429
	11th to 20th	Night	26% 38% 6% 18% 11% 2	4216
	21st to end	Night	31% 41% 4 16% 8% 1	4532
February	1st to 10th	Night	14% 66% 6% 9% 3 1	2470
	11th to 20th	Night	17% 64% 2 6% 9% 2	2238
	21st to end	Night	14% 65% 3 9% 6% 2	1884
March	1st to 10th	Night	35% 42% 5% 10% 6% 1	3675
	11th to 20th	Night	16% 43% 6% 19% 13% 3	3480
	21st to end	Night	27% 41% 4 10% 14% 3	3608
April	1st to 10th	Night	17% 65% 3 7% 7% 1	1900
	11th to 20th	Night	13% 67% 4 8% 6% 1	1875
	21st to end	Night	15% 66% 5% 7% 6% 1	1900
May	1st to 10th	Night	34% 44% 6% 13% 3	3074
	11th to 20th	Night	35% 43% 9% 11% 3	2539
	21st to end	Night	22% 43% 11% 12% 9% 2	2739
June	1st to 10th	Night	15% 67% 2 8% 7% 1	1520
	11th to 20th	Night	11% 67% 4 10% 8%	1520
	21st to end	Night	12% 65% 5% 10% 7% 1	1520
July	1st to 10th	Night	26% 42% 15% 12% 6% 1	2480
	11th to 20th	Night	27% 39% 15% 16% 4	2472
	21st to end	Night	34% 38% 10% 10% 9%	2890
August	1st to 10th	Night	35% 39% 10% 13% 4	2834
	11th to 20th	Night	23% 40% 9% 21% 6%	3127
	21st to end	Night	16% 38% 6% 20% 20% 1	3476
September	1st to 10th	Night	14% 61% 9% 10% 5% 2	1900
	11th to 20th	Night	14% 61% 4 10% 9% 2	1922
	21st to end	Night	23% 61% 3 8% 4	2093
October	1st to 10th	Night	21% 37% 7% 16% 16% 2	3800
	11th to 20th	Night	10% 37% 8% 13% 26% 6%	3779
	21st to end	Night	9% 36% 8% 20% 20% 7%	4142
November	1st to 10th	Night	17% 58% 4 11% 7% 3	2470
	11th to 20th	Night	15% 60% 3 7% 12% 3	2470
	21st to end	Night	12% 60% 4 12% 10% 1	2531
December	1st to 10th	Night	22% 60% 5% 9% 3 2	2660
	11th to 20th	Night	20% 49% 5% 12% 12% 2	3288
	21st to end	Night	27% 41% 11% 15% 5% 1	4884

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	20% 23% 36% 16% 4 1	180
	11th to 20th	Day	23% 30% 29% 14% 4	240
	21st to end	Day	21% 21% 41% 14% 3	297
February	1st to 10th	Day	20% 25% 38% 13% 4	270
	11th to 20th	Day	25% 22% 38% 12% 2	437
	21st to end	Day	24% 19% 37% 15% 4	382
March	1st to 10th	Day	22% 23% 32% 18% 5%	460
	11th to 20th	Day	22% 21% 34% 17% 3 2	460
	21st to end	Day	23% 19% 35% 19% 5%	506
April	1st to 10th	Day	20% 21% 37% 15% 5% 2	460
	11th to 20th	Day	16% 15% 35% 26% 7% 2	452
	21st to end	Day	20% 14% 35% 21% 7% 2	460
May	1st to 10th	Day	21% 15% 35% 19% 9% 2	463
	11th to 20th	Day	20% 11% 32% 28% 8% 1	487
	21st to end	Day	17% 6% 22% 32% 18% 5%	529
June	1st to 10th	Day	12% 8% 29% 31% 17% 3	490
	11th to 20th	Day	12% 6% 27% 31% 18% 6%	490
	21st to end	Day	11% 4 25% 37% 19% 4	490
July	1st to 10th	Day	10% 4 19% 34% 25% 9%	485
	11th to 20th	Day	4 2 18% 39% 28% 10%	484
	21st to end	Day	9% 3 21% 35% 25% 7%	532
August	1st to 10th	Day	11% 4 20% 31% 23% 10%	486
	11th to 20th	Day	9% 4 18% 30% 30% 8%	479
	21st to end	Day	8% 5% 19% 31% 24% 12%	539
September	1st to 10th	Day	14% 5% 22% 29% 17% 13%	490
	11th to 20th	Day	12% 5% 24% 29% 20% 10%	490
	21st to end	Day	23% 9% 28% 24% 12% 5%	490
October	1st to 10th	Day	19% 8% 26% 25% 15% 8%	490
	11th to 20th	Day	19% 12% 25% 23% 19% 3	490
	21st to end	Day	15% 12% 33% 26% 11% 3	532
November	1st to 10th	Day	17% 11% 28% 24% 16% 4	378
	11th to 20th	Day	16% 16% 34% 22% 11% 1	370
	21st to end	Day	16% 17% 29% 26% 10% 2	304
December	1st to 10th	Day	19% 21% 38% 14% 7% 1	180
	11th to 20th	Day	22% 21% 33% 17% 7%	180
	21st to end	Day	22% 20% 27% 23% 8% 1	198
January	1st to 10th	Night	18% 17% 37% 23% 5%	760
	11th to 20th	Night	19% 17% 34% 26% 4	760
	21st to end	Night	19% 14% 41% 24% 3	836
February	1st to 10th	Night	19% 13% 38% 26% 3	760
	11th to 20th	Night	23% 19% 36% 20% 1	743
	21st to end	Night	22% 17% 36% 21% 4	628
March	1st to 10th	Night	19% 16% 38% 23% 5%	760
	11th to 20th	Night	22% 15% 36% 21% 6% 1	760
	21st to end	Night	20% 13% 38% 24% 5%	836
April	1st to 10th	Night	20% 15% 39% 20% 6%	760
	11th to 20th	Night	14% 12% 35% 33% 6%	751
	21st to end	Night	19% 8% 35% 30% 8%	760
May	1st to 10th	Night	19% 10% 32% 31% 8% 1	713
	11th to 20th	Night	18% 7% 30% 34% 10%	404
	21st to end	Night	15% 4 22% 39% 19% 1	411
June	1st to 10th	Night	13% 4 23% 45% 14% 1	380
	11th to 20th	Night	10% 2 21% 45% 23%	380
	21st to end	Night	7% 3 21% 50% 18%	380
July	1st to 10th	Night	8% 2 19% 47% 22% 2	370
	11th to 20th	Night	4 2 15% 44% 35% 1	368
	21st to end	Night	6% 1 15% 47% 28% 2	561
August	1st to 10th	Night	10% 2 12% 46% 28% 2	574
	11th to 20th	Night	10% 2 17% 39% 28% 4	750
	21st to end	Night	9% 3 15% 40% 29% 5%	836
September	1st to 10th	Night	17% 3 15% 34% 27% 3	760
	11th to 20th	Night	12% 4 17% 34% 29% 4	760
	21st to end	Night	23% 7% 19% 31% 19% 2	760
October	1st to 10th	Night	19% 5% 19% 33% 19% 5%	760
	11th to 20th	Night	18% 8% 26% 31% 16% 1	760
	21st to end	Night	17% 8% 32% 29% 12% 2	836
November	1st to 10th	Night	13% 9% 32% 31% 13% 2	760
	11th to 20th	Night	16% 12% 32% 30% 9% 1	760
	21st to end	Night	14% 13% 32% 30% 11% 1	760
December	1st to 10th	Night	23% 13% 33% 21% 9% 1	760
	11th to 20th	Night	19% 13% 38% 24% 6%	760
	21st to end	Night	17% 12% 36% 30% 4	836

Page generated at 2024-11-03 02:11:23. Version ac07

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