Rickett's Glen State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Rickett's Glen State Park clear sky chart from 2005-11-06 to 2024-11-04.

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	17% 9% 3 7% 5% 5% 5% 4 6% 7% 33%	101432
	Night	17% 9% 3 7% 5% 4 4 4 5% 7% 35%	97588
Transparency	Day	49% 3 11% 23% 12% 2	105006
	Night	48% 3 12% 23% 13% 2	102102
Seeing	Day	24% 17% 28% 19% 9% 3	14806
	Night	22% 15% 29% 24% 9% 1	24076

By Month

Percentage Cloud Cover NE (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	13% 17% 6% 9% 5% 4 4 3 4 5% 31%	2517
	11th to 20th	Day	12% 16% 8% 17% 6% 5% 4 3 4 5% 21%	2598
	21st to end	Day	19% 14% 8% 11% 6% 4 4 3 4 5% 21%	3124
February	1st to 10th	Day	15% 14% 5% 10% 5% 6% 5% 4 6% 5% 27%	1710
	11th to 20th	Day	13% 11% 4 9% 7% 5% 4 4 6% 7% 30%	1720
	21st to end	Day	19% 12% 3 9% 6% 4 4 3 5% 6% 28%	1570
March	1st to 10th	Day	23% 12% 3 7% 5% 4 4 3 4 5% 29%	3229
	11th to 20th	Day	10% 11% 4 9% 5% 4 5% 4 5% 6% 37%	3480
	21st to end	Day	18% 12% 3 6% 4 3 4 2 5% 6% 37%	3968
April	1st to 10th	Day	17% 13% 3 7% 5% 4 4 3 4 6% 32%	2280
	11th to 20th	Day	17% 11% 3 7% 4 5% 4 4 5% 5% 35%	2254
	21st to end	Day	17% 8% 3 8% 5% 4 5% 3 6% 6% 36%	2280
May	1st to 10th	Day	27% 8% 2 6% 4 4 4 3 5% 7% 30%	4230
	11th to 20th	Day	26% 9% 3 8% 5% 5% 4 4 5% 6% 25%	4398
	21st to end	Day	15% 5% 2 5% 4 4 4 4 7% 9% 41%	4837
June	1st to 10th	Day	16% 7% 2 6% 7% 5% 6% 4 6% 8% 34%	2660
	11th to 20th	Day	16% 7% 2 6% 6% 5% 5% 4 6% 7% 35%	2660
	21st to end	Day	15% 6% 2 6% 5% 4 5% 4 7% 9% 37%	2660
July	1st to 10th	Day	9% 6% 3 6% 6% 6% 6% 5% 7% 10% 35%	4440
	11th to 20th	Day	9% 5% 2 7% 5% 5% 5% 5% 9% 10% 37%	4440
	21st to end	Day	13% 8% 3 8% 5% 6% 6% 4 7% 7% 33%	4701
August	1st to 10th	Day	23% 7% 2 7% 5% 5% 5% 4 5% 7% 30%	4104
	11th to 20th	Day	17% 6% 2 6% 5% 5% 6% 4 6% 9% 34%	3885
	21st to end	Day	18% 5% 2 5% 3 4 5% 4 7% 9% 39%	4180
September	1st to 10th	Day	17% 6% 2 6% 4 4 4 4 5% 8% 41%	2280
	11th to 20th	Day	14% 6% 2 5% 3 4 3 4 5% 6% 46%	2280
	21st to end	Day	23% 7% 3 6% 4 4 4 3 5% 6% 35%	2026
October	1st to 10th	Day	20% 7% 3 5% 4 4 4 3 6% 8% 37%	1900
	11th to 20th	Day	18% 9% 3 7% 5% 4 4 3 4 7% 36%	1900
	21st to end	Day	20% 10% 2 7% 5% 4 4 4 5% 6% 32%	2052
November	1st to 10th	Day	15% 8% 3 6% 5% 4 4 3 4 6% 42%	1698
	11th to 20th	Day	17% 11% 3 8% 5% 4 3 3 5% 6% 34%	1653
	21st to end	Day	18% 10% 3 7% 6% 5% 4 4 5% 7% 32%	1520
December	1st to 10th	Day	19% 14% 4 8% 5% 7% 4 3 5% 4 25%	1520
	11th to 20th	Day	21% 11% 5% 8% 4 4 4 3 5% 5% 29%	1906
	21st to end	Day	19% 15% 6% 11% 7% 5% 5% 4 4 4 20%	2772
January	1st to 10th	Night	14% 10% 4 9% 6% 5% 5% 4 6% 7% 30%	4429
	11th to 20th	Night	14% 13% 6% 15% 5% 4 4 3 4 5% 26%	4344
	21st to end	Night	19% 13% 4 11% 8% 4 4 4 5% 5% 23%	4532
February	1st to 10th	Night	16% 11% 3 8% 5% 5% 4 4 5% 7% 31%	2470
	11th to 20th	Night	13% 10% 4 10% 7% 5% 5% 4 6% 7% 30%	2346
	21st to end	Night	16% 13% 3 9% 5% 5% 4 4 4 6% 31%	1884
March	1st to 10th	Night	21% 16% 4 6% 4 3 4 3 4 5% 30%	3609
	11th to 20th	Night	10% 9% 6% 8% 5% 5% 5% 4 5% 7% 37%	3479
	21st to end	Night	13% 12% 2 8% 5% 4 4 3 4 5% 41%	3663
April	1st to 10th	Night	16% 12% 4 8% 6% 4 4 4 5% 6% 31%	1900
	11th to 20th	Night	18% 8% 2 6% 5% 4 4 3 5% 8% 37%	1875
	21st to end	Night	19% 7% 2 6% 4 4 4 4 6% 6% 40%	1900
May	1st to 10th	Night	28% 9% 3 6% 4 3 3 3 4 5% 31%	2738
	11th to 20th	Night	26% 9% 3 6% 4 4 4 3 5% 6% 31%	2495
	21st to end	Night	16% 7% 2 5% 5% 4 3 3 6% 8% 40%	2738
June	1st to 10th	Night	16% 5% 2 5% 4 4 5% 4 6% 8% 40%	1520
	11th to 20th	Night	15% 5% 2 6% 5% 4 5% 3 7% 9% 39%	1520
	21st to end	Night	13% 6% 3 4 4 4 4 4 8% 9% 41%	1520
July	1st to 10th	Night	11% 6% 2 7% 4 5% 5% 4 6% 9% 43%	2520
	11th to 20th	Night	12% 5% 3 5% 4 5% 5% 5% 7% 10% 40%	2520
	21st to end	Night	17% 6% 2 5% 5% 4 4 3 6% 6% 42%	2849
August	1st to 10th	Night	21% 7% 2 5% 4 4 4 4 7% 8% 34%	2825
	11th to 20th	Night	18% 8% 3 6% 3 3 4 3 4 5% 44%	2911
	21st to end	Night	15% 4 1 4 3 4 4 3 5% 8% 47%	3476
September	1st to 10th	Night	17% 5% 2 5% 3 4 4 4 4 7% 43%	1900
	11th to 20th	Night	13% 6% 2 5% 3 4 3 3 5% 6% 50%	1900
	21st to end	Night	20% 7% 2 6% 4 4 3 3 4 6% 41%	2151
October	1st to 10th	Night	21% 9% 2 5% 3 3 3 3 3 7% 42%	2280
	11th to 20th	Night	18% 8% 2 5% 4 4 3 4 4 5% 43%	2280
	21st to end	Night	21% 8% 2 6% 4 4 5% 3 5% 7% 34%	2545
November	1st to 10th	Night	11% 8% 3 7% 4 4 4 4 5% 6% 44%	2453
	11th to 20th	Night	19% 8% 3 6% 5% 5% 4 4 5% 5% 36%	2524
	21st to end	Night	14% 9% 4 7% 5% 4 5% 4 5% 7% 35%	2660
December	1st to 10th	Night	17% 13% 5% 9% 4 5% 5% 4 6% 7% 25%	2660
	11th to 20th	Night	19% 11% 4 8% 5% 4 5% 4 5% 6% 29%	3288
	21st to end	Night	20% 12% 5% 9% 5% 5% 5% 3 5% 6% 24%	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	56% 2 10% 24% 7% 2	2518
	11th to 20th	Day	66% 3 8% 16% 6% 1	2598
	21st to end	Day	65% 1 9% 18% 6% 1	3124
February	1st to 10th	Day	58% 2 12% 18% 10% 1	1710
	11th to 20th	Day	53% 3 8% 26% 9% 1	1729
	21st to end	Day	56% 2 8% 22% 9% 2	1570
March	1st to 10th	Day	58% 1 8% 23% 7% 1	3232
	11th to 20th	Day	46% 2 12% 27% 10% 3	3480
	21st to end	Day	50% 1 9% 18% 20% 2	3968
April	1st to 10th	Day	53% 3 8% 21% 12% 4	2280
	11th to 20th	Day	49% 3 10% 21% 14% 2	2254
	21st to end	Day	47% 2 9% 23% 15% 4	2280
May	1st to 10th	Day	55% 2 9% 22% 10% 1	4242
	11th to 20th	Day	59% 2 11% 19% 8% 1	4402
	21st to end	Day	39% 4 11% 28% 17% 2	4837
June	1st to 10th	Day	47% 4 13% 22% 13% 1	2660
	11th to 20th	Day	46% 4 13% 23% 12% 1	2660
	21st to end	Day	41% 5% 14% 28% 12%	2660
July	1st to 10th	Day	41% 7% 15% 25% 11% 1	4370
	11th to 20th	Day	39% 5% 18% 24% 13% 1	4365
	21st to end	Day	49% 5% 12% 19% 15% 1	4551
August	1st to 10th	Day	53% 4 13% 19% 10%	4091
	11th to 20th	Day	46% 4 13% 28% 9%	3924
	21st to end	Day	39% 4 12% 33% 10% 1	4180
September	1st to 10th	Day	42% 5% 10% 25% 16% 2	2280
	11th to 20th	Day	37% 3 10% 26% 22% 2	2280
	21st to end	Day	48% 4 10% 20% 17% 1	2026
October	1st to 10th	Day	42% 4 9% 22% 20% 4	3160
	11th to 20th	Day	41% 3 6% 29% 16% 4	3140
	21st to end	Day	35% 2 15% 30% 16% 1	3366
November	1st to 10th	Day	41% 3 13% 24% 17% 3	1698
	11th to 20th	Day	50% 3 10% 21% 14% 2	1653
	21st to end	Day	50% 3 14% 24% 8% 1	1520
December	1st to 10th	Day	59% 4 13% 15% 7% 1	1520
	11th to 20th	Day	56% 3 16% 20% 6%	1906
	21st to end	Day	68% 2 9% 15% 5%	2772
January	1st to 10th	Night	52% 1 12% 26% 8% 1	4429
	11th to 20th	Night	60% 3 10% 18% 7% 1	4344
	21st to end	Night	62% 2 9% 19% 7% 1	4532
February	1st to 10th	Night	51% 3 13% 23% 10% 1	2470
	11th to 20th	Night	53% 4 9% 21% 12% 2	2348
	21st to end	Night	54% 2 9% 21% 12% 2	1884
March	1st to 10th	Night	57% 2 9% 21% 10% 2	3619
	11th to 20th	Night	46% 1 14% 28% 10% 1	3480
	21st to end	Night	47% 2 8% 19% 20% 4	3663
April	1st to 10th	Night	54% 2 8% 21% 12% 2	1900
	11th to 20th	Night	45% 4 10% 22% 17% 1	1875
	21st to end	Night	44% 3 10% 22% 18% 3	1900
May	1st to 10th	Night	56% 2 7% 24% 8% 2	2745
	11th to 20th	Night	55% 4 14% 18% 9% 1	2496
	21st to end	Night	44% 3 14% 21% 15% 2	2739
June	1st to 10th	Night	41% 4 11% 27% 17% 1	1520
	11th to 20th	Night	40% 4 15% 28% 11% 2	1520
	21st to end	Night	37% 6% 13% 30% 13% 1	1520
July	1st to 10th	Night	38% 5% 15% 22% 17% 2	2480
	11th to 20th	Night	39% 6% 16% 25% 13% 1	2472
	21st to end	Night	42% 5% 14% 20% 19% 1	2758
August	1st to 10th	Night	47% 5% 16% 23% 8%	2814
	11th to 20th	Night	43% 3 12% 27% 14%	2938
	21st to end	Night	36% 4 12% 34% 15% 1	3476
September	1st to 10th	Night	41% 5% 10% 27% 16% 2	1900
	11th to 20th	Night	35% 3 11% 28% 22% 2	1900
	21st to end	Night	45% 2 9% 24% 19% 1	2151
October	1st to 10th	Night	43% 3 10% 23% 20% 1	3800
	11th to 20th	Night	34% 2 11% 27% 19% 6%	3779
	21st to end	Night	34% 2 16% 28% 17% 2	4181
November	1st to 10th	Night	40% 3 13% 24% 18% 2	2453
	11th to 20th	Night	48% 3 11% 22% 13% 3	2524
	21st to end	Night	47% 3 14% 25% 10% 1	2660
December	1st to 10th	Night	57% 3 13% 20% 7%	2660
	11th to 20th	Night	55% 3 12% 19% 10% 1	3288
	21st to end	Night	60% 2 12% 22% 4	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	30% 25% 33% 9% 3 1	180
	11th to 20th	Day	37% 25% 29% 7% 1	204
	21st to end	Day	27% 30% 27% 13% 2	297
February	1st to 10th	Day	33% 29% 29% 8% 1	270
	11th to 20th	Day	35% 29% 31% 5%	327
	21st to end	Day	35% 24% 29% 11% 2	382
March	1st to 10th	Day	34% 23% 27% 13% 3	460
	11th to 20th	Day	29% 26% 30% 11% 3 1	460
	21st to end	Day	31% 25% 26% 12% 4 2	506
April	1st to 10th	Day	31% 25% 26% 12% 5% 1	460
	11th to 20th	Day	31% 24% 24% 13% 6% 3	452
	21st to end	Day	25% 22% 33% 13% 5% 2	460
May	1st to 10th	Day	31% 20% 29% 10% 8% 2	463
	11th to 20th	Day	25% 15% 31% 17% 9% 2	487
	21st to end	Day	22% 10% 29% 20% 16% 3	529
June	1st to 10th	Day	21% 14% 31% 21% 11% 2	490
	11th to 20th	Day	20% 13% 26% 29% 12% 1	490
	21st to end	Day	19% 12% 34% 25% 10% 1	490
July	1st to 10th	Day	14% 8% 28% 29% 18% 4	485
	11th to 20th	Day	11% 9% 27% 32% 17% 4	484
	21st to end	Day	15% 10% 32% 28% 12% 4	532
August	1st to 10th	Day	14% 9% 27% 24% 20% 6%	486
	11th to 20th	Day	18% 7% 27% 27% 15% 6%	479
	21st to end	Day	16% 12% 25% 25% 13% 9%	539
September	1st to 10th	Day	21% 11% 24% 21% 17% 7%	490
	11th to 20th	Day	14% 7% 26% 26% 18% 9%	490
	21st to end	Day	29% 12% 23% 21% 12% 3	490
October	1st to 10th	Day	28% 12% 20% 23% 13% 4	490
	11th to 20th	Day	23% 20% 28% 20% 7% 1	490
	21st to end	Day	27% 18% 29% 20% 6% 1	519
November	1st to 10th	Day	24% 19% 27% 20% 9% 1	374
	11th to 20th	Day	28% 23% 27% 18% 4 1	313
	21st to end	Day	29% 24% 35% 9% 3	180
December	1st to 10th	Day	33% 28% 25% 7% 6% 1	180
	11th to 20th	Day	35% 26% 28% 9% 2	180
	21st to end	Day	30% 28% 30% 10% 2	198
January	1st to 10th	Night	22% 24% 38% 13% 3	760
	11th to 20th	Night	24% 22% 32% 19% 3	760
	21st to end	Night	19% 25% 36% 18% 2	836
February	1st to 10th	Night	25% 21% 34% 18% 2	760
	11th to 20th	Night	26% 25% 37% 12% 1	743
	21st to end	Night	29% 20% 34% 14% 3	628
March	1st to 10th	Night	26% 22% 34% 16% 2	760
	11th to 20th	Night	26% 23% 30% 17% 4	760
	21st to end	Night	25% 22% 32% 16% 4 1	836
April	1st to 10th	Night	24% 22% 32% 19% 4	760
	11th to 20th	Night	23% 17% 34% 19% 6%	751
	21st to end	Night	24% 16% 32% 24% 5%	760
May	1st to 10th	Night	28% 13% 25% 24% 10%	514
	11th to 20th	Night	21% 11% 31% 30% 6% 1	374
	21st to end	Night	21% 6% 21% 37% 14%	411
June	1st to 10th	Night	18% 4 24% 38% 15% 1	380
	11th to 20th	Night	17% 7% 26% 37% 14%	380
	21st to end	Night	13% 4 30% 42% 11% 1	380
July	1st to 10th	Night	12% 5% 22% 39% 20% 2	370
	11th to 20th	Night	10% 7% 19% 44% 20% 1	368
	21st to end	Night	13% 4 21% 43% 19% 2	477
August	1st to 10th	Night	16% 2 16% 43% 21% 2	567
	11th to 20th	Night	16% 3 17% 35% 26% 3	638
	21st to end	Night	16% 5% 21% 33% 24% 2	836
September	1st to 10th	Night	19% 6% 23% 31% 19% 2	760
	11th to 20th	Night	16% 6% 22% 27% 25% 4	760
	21st to end	Night	23% 9% 21% 29% 16% 2	760
October	1st to 10th	Night	27% 8% 22% 25% 16% 2	760
	11th to 20th	Night	23% 12% 28% 29% 6% 1	760
	21st to end	Night	25% 14% 32% 24% 5%	836
November	1st to 10th	Night	16% 16% 34% 26% 8% 1	755
	11th to 20th	Night	24% 18% 30% 22% 5% 1	760
	21st to end	Night	21% 20% 34% 21% 3 1	760
December	1st to 10th	Night	26% 23% 32% 15% 4	760
	11th to 20th	Night	23% 20% 33% 20% 3	760
	21st to end	Night	26% 20% 35% 17% 3	836

Page generated at 2024-11-01 22:47:44. Version ac07

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