Stone Tavern Farm
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Stone Tavern Farm clear sky chart from 2005-11-06 to 2024-11-08.

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	16% 12% 4 9% 5% 5% 5% 4 5% 7% 29%	101443
	Night	16% 13% 5% 10% 5% 4 4 3 5% 6% 29%	97663
Transparency	Day	53% 7% 11% 18% 9% 1	104950
	Night	54% 7% 11% 18% 9% 1	102245
Seeing	Day	26% 20% 28% 16% 7% 3	14826
	Night	25% 20% 25% 21% 8% 1	23942

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	12% 15% 13% 16% 5% 3 3 3 3 4 22%	2517
	11th to 20th	Day	12% 18% 8% 15% 7% 6% 4 3 4 3 19%	2520
	21st to end	Day	18% 18% 10% 12% 6% 5% 3 3 4 4 18%	2973
February	1st to 10th	Day	13% 16% 5% 14% 10% 4 5% 4 5% 5% 20%	1710
	11th to 20th	Day	10% 13% 6% 15% 7% 6% 4 4 5% 6% 25%	1787
	21st to end	Day	15% 16% 4 11% 8% 4 4 3 5% 5% 25%	1570
March	1st to 10th	Day	21% 18% 5% 10% 5% 3 3 2 3 5% 26%	3116
	11th to 20th	Day	10% 18% 8% 11% 5% 4 3 3 4 5% 26%	3384
	21st to end	Day	20% 12% 4 11% 4 3 3 3 4 6% 31%	4096
April	1st to 10th	Day	15% 17% 5% 8% 5% 4 4 3 5% 5% 29%	2280
	11th to 20th	Day	16% 12% 3 8% 5% 4 4 4 4 5% 33%	2254
	21st to end	Day	19% 14% 4 8% 4 4 4 3 4 5% 31%	2308
May	1st to 10th	Day	26% 12% 3 6% 4 4 4 3 5% 6% 28%	4256
	11th to 20th	Day	18% 11% 3 7% 6% 5% 5% 4 6% 7% 27%	4398
	21st to end	Day	13% 7% 2 6% 5% 5% 5% 5% 6% 8% 37%	4837
June	1st to 10th	Day	19% 8% 3 8% 5% 6% 5% 5% 6% 9% 28%	2660
	11th to 20th	Day	17% 8% 3 7% 5% 5% 5% 5% 7% 9% 29%	2660
	21st to end	Day	19% 8% 3 6% 5% 6% 5% 4 7% 8% 29%	2660
July	1st to 10th	Day	12% 7% 3 8% 6% 6% 6% 5% 8% 9% 31%	4440
	11th to 20th	Day	10% 6% 3 8% 6% 6% 6% 5% 9% 11% 30%	4440
	21st to end	Day	15% 8% 3 8% 6% 6% 6% 4 7% 7% 30%	4814
August	1st to 10th	Day	20% 8% 3 9% 5% 5% 5% 4 6% 8% 28%	4275
	11th to 20th	Day	16% 7% 3 8% 6% 6% 7% 5% 9% 8% 26%	3770
	21st to end	Day	15% 8% 2 6% 4 5% 5% 4 7% 8% 34%	4180
September	1st to 10th	Day	16% 6% 2 7% 5% 5% 4 3 5% 8% 38%	2280
	11th to 20th	Day	14% 8% 2 6% 4 4 3 4 5% 7% 44%	2228
	21st to end	Day	17% 7% 2 8% 5% 4 5% 4 5% 8% 36%	2090
October	1st to 10th	Day	19% 10% 3 8% 5% 5% 4 3 4 5% 32%	1930
	11th to 20th	Day	15% 13% 3 6% 4 4 4 4 6% 6% 35%	1900
	21st to end	Day	21% 17% 3 7% 4 4 4 3 5% 6% 27%	1940
November	1st to 10th	Day	13% 14% 4 7% 4 4 4 3 5% 7% 36%	1734
	11th to 20th	Day	15% 18% 5% 10% 5% 5% 4 3 4 3 28%	1710
	21st to end	Day	14% 18% 5% 8% 5% 5% 5% 3 4 6% 26%	1528
December	1st to 10th	Day	14% 22% 7% 14% 5% 4 4 3 4 5% 18%	1520
	11th to 20th	Day	17% 18% 9% 11% 6% 3 3 2 3 3 24%	1906
	21st to end	Day	16% 20% 9% 13% 6% 4 4 3 5% 5% 16%	2772
January	1st to 10th	Night	14% 15% 8% 13% 5% 4 5% 3 4 5% 23%	4429
	11th to 20th	Night	10% 20% 8% 16% 9% 5% 4 3 3 4 18%	4440
	21st to end	Night	18% 17% 6% 14% 8% 5% 4 3 3 4 17%	4682
February	1st to 10th	Night	12% 16% 6% 13% 8% 6% 5% 4 5% 5% 21%	2470
	11th to 20th	Night	9% 14% 7% 14% 9% 6% 6% 4 5% 6% 20%	2279
	21st to end	Night	17% 11% 5% 13% 7% 5% 4 4 4 6% 25%	1884
March	1st to 10th	Night	18% 14% 5% 12% 6% 4 4 3 4 5% 25%	3724
	11th to 20th	Night	10% 17% 9% 11% 7% 5% 4 3 4 5% 26%	3557
	21st to end	Night	14% 14% 6% 11% 5% 4 4 3 4 4 31%	3535
April	1st to 10th	Night	14% 16% 5% 9% 5% 5% 4 4 4 6% 27%	1900
	11th to 20th	Night	17% 15% 3 6% 5% 4 3 3 4 5% 35%	1875
	21st to end	Night	19% 13% 4 6% 4 3 4 3 4 6% 34%	1870
May	1st to 10th	Night	25% 12% 3 6% 4 3 3 3 4 6% 31%	2713
	11th to 20th	Night	17% 12% 4 9% 4 4 5% 3 5% 6% 30%	2495
	21st to end	Night	14% 9% 3 7% 4 4 4 4 6% 8% 36%	2738
June	1st to 10th	Night	15% 9% 3 7% 4 4 4 4 6% 8% 37%	1520
	11th to 20th	Night	17% 8% 2 5% 4 4 4 4 6% 9% 38%	1520
	21st to end	Night	13% 6% 2 5% 4 6% 5% 4 7% 8% 40%	1520
July	1st to 10th	Night	13% 8% 3 7% 6% 5% 5% 4 7% 7% 37%	2520
	11th to 20th	Night	16% 7% 2 6% 4 4 5% 4 6% 8% 39%	2520
	21st to end	Night	17% 7% 3 6% 5% 4 4 4 6% 6% 38%	2739
August	1st to 10th	Night	25% 8% 3 7% 4 4 4 3 4 6% 32%	2651
	11th to 20th	Night	17% 10% 2 7% 4 3 5% 3 4 6% 38%	3024
	21st to end	Night	13% 12% 2 5% 4 3 4 3 5% 7% 43%	3476
September	1st to 10th	Night	15% 7% 3 7% 4 4 4 3 5% 6% 43%	1900
	11th to 20th	Night	15% 7% 1 6% 3 3 3 3 5% 6% 49%	1952
	21st to end	Night	17% 7% 2 7% 5% 5% 3 3 4 6% 40%	2090
October	1st to 10th	Night	19% 11% 3 7% 4 4 4 4 5% 6% 33%	2247
	11th to 20th	Night	17% 11% 3 8% 4 4 4 3 5% 5% 37%	2280
	21st to end	Night	21% 15% 3 8% 4 4 3 3 5% 7% 27%	2656
November	1st to 10th	Night	11% 15% 4 7% 4 4 4 3 5% 5% 37%	2505
	11th to 20th	Night	16% 16% 5% 9% 5% 4 4 4 4 6% 27%	2470
	21st to end	Night	12% 15% 6% 10% 5% 5% 5% 3 5% 6% 27%	2650
December	1st to 10th	Night	14% 20% 7% 12% 6% 5% 4 3 5% 5% 18%	2660
	11th to 20th	Night	17% 16% 7% 13% 6% 4 4 3 4 4 22%	3288
	21st to end	Night	19% 17% 8% 14% 6% 4 3 3 4 4 18%	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	62% 9% 9% 15% 4 1	2518
	11th to 20th	Day	68% 7% 6% 13% 4 2	2520
	21st to end	Day	69% 5% 8% 12% 5% 1	2973
February	1st to 10th	Day	66% 6% 9% 13% 6% 1	1710
	11th to 20th	Day	58% 6% 9% 17% 9% 1	1796
	21st to end	Day	59% 6% 10% 16% 8%	1570
March	1st to 10th	Day	62% 5% 10% 14% 9% 1	3119
	11th to 20th	Day	57% 8% 12% 15% 8% 1	3384
	21st to end	Day	55% 7% 6% 14% 16% 3	4096
April	1st to 10th	Day	57% 5% 7% 19% 9% 2	2280
	11th to 20th	Day	51% 8% 10% 18% 12% 1	2254
	21st to end	Day	56% 5% 9% 16% 12% 2	2308
May	1st to 10th	Day	56% 6% 9% 17% 10% 1	4270
	11th to 20th	Day	53% 10% 11% 19% 7% 1	4402
	21st to end	Day	40% 10% 14% 23% 11% 1	4837
June	1st to 10th	Day	51% 8% 14% 16% 11%	2660
	11th to 20th	Day	49% 8% 15% 18% 9% 1	2660
	21st to end	Day	51% 9% 13% 19% 8%	2660
July	1st to 10th	Day	45% 9% 15% 20% 10% 1	4370
	11th to 20th	Day	43% 10% 16% 21% 9%	4365
	21st to end	Day	49% 9% 13% 19% 10%	4661
August	1st to 10th	Day	54% 8% 13% 17% 8%	4261
	11th to 20th	Day	49% 10% 16% 22% 4	3807
	21st to end	Day	44% 7% 14% 27% 7% 1	4180
September	1st to 10th	Day	44% 7% 13% 23% 12% 1	2280
	11th to 20th	Day	40% 6% 10% 23% 20% 1	2228
	21st to end	Day	46% 7% 12% 20% 13% 2	2090
October	1st to 10th	Day	52% 5% 8% 19% 14% 1	3203
	11th to 20th	Day	44% 5% 9% 20% 16% 5%	3140
	21st to end	Day	42% 6% 15% 24% 11% 2	3178
November	1st to 10th	Day	48% 6% 12% 19% 13% 2	1734
	11th to 20th	Day	59% 6% 9% 15% 10% 2	1710
	21st to end	Day	58% 7% 12% 16% 6% 1	1528
December	1st to 10th	Day	69% 5% 9% 10% 5% 1	1520
	11th to 20th	Day	66% 4 12% 14% 4	1906
	21st to end	Day	70% 7% 7% 10% 7%	2772
January	1st to 10th	Night	58% 10% 12% 13% 6% 1	4429
	11th to 20th	Night	69% 6% 9% 11% 5% 1	4440
	21st to end	Night	69% 7% 7% 11% 5% 1	4682
February	1st to 10th	Night	62% 8% 9% 13% 7% 1	2470
	11th to 20th	Night	62% 9% 9% 12% 7% 1	2281
	21st to end	Night	59% 7% 10% 15% 8% 2	1884
March	1st to 10th	Night	61% 6% 10% 14% 8% 1	3734
	11th to 20th	Night	59% 8% 11% 16% 6% 1	3558
	21st to end	Night	55% 6% 7% 15% 16% 2	3535
April	1st to 10th	Night	57% 7% 10% 17% 8% 1	1900
	11th to 20th	Night	51% 7% 10% 18% 13%	1875
	21st to end	Night	51% 8% 8% 19% 11% 3	1870
May	1st to 10th	Night	55% 6% 10% 18% 9% 2	2719
	11th to 20th	Night	52% 11% 11% 18% 7% 1	2496
	21st to end	Night	42% 11% 14% 20% 12% 1	2739
June	1st to 10th	Night	45% 8% 11% 24% 12% 1	1520
	11th to 20th	Night	43% 7% 17% 23% 9%	1520
	21st to end	Night	39% 10% 16% 24% 10% 1	1520
July	1st to 10th	Night	44% 7% 17% 18% 13% 1	2480
	11th to 20th	Night	41% 7% 15% 26% 10%	2472
	21st to end	Night	45% 8% 13% 22% 11% 1	2651
August	1st to 10th	Night	53% 8% 13% 19% 7%	2641
	11th to 20th	Night	47% 7% 15% 23% 8%	3053
	21st to end	Night	41% 6% 12% 31% 9%	3476
September	1st to 10th	Night	41% 7% 13% 25% 13% 1	1900
	11th to 20th	Night	36% 6% 11% 25% 21% 1	1952
	21st to end	Night	47% 6% 10% 22% 15% 1	2090
October	1st to 10th	Night	54% 6% 10% 19% 10% 1	3754
	11th to 20th	Night	44% 5% 14% 16% 16% 6%	3779
	21st to end	Night	45% 6% 15% 24% 9% 1	4368
November	1st to 10th	Night	48% 7% 10% 18% 14% 3	2505
	11th to 20th	Night	55% 7% 11% 16% 9% 3	2470
	21st to end	Night	55% 8% 14% 17% 6%	2650
December	1st to 10th	Night	67% 7% 10% 12% 4	2660
	11th to 20th	Night	65% 5% 10% 12% 7%	3288
	21st to end	Night	69% 6% 8% 11% 6%	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	32% 28% 25% 11% 3 1	180
	11th to 20th	Day	41% 27% 22% 8% 1 1	180
	21st to end	Day	30% 30% 29% 9% 3	256
February	1st to 10th	Day	40% 32% 23% 4	270
	11th to 20th	Day	39% 34% 19% 7% 1	395
	21st to end	Day	38% 25% 26% 9% 2	382
March	1st to 10th	Day	33% 27% 27% 11% 3	460
	11th to 20th	Day	37% 24% 25% 9% 3	460
	21st to end	Day	35% 27% 22% 9% 5% 2	506
April	1st to 10th	Day	36% 26% 21% 13% 4	460
	11th to 20th	Day	30% 27% 25% 11% 5% 2	452
	21st to end	Day	31% 24% 28% 10% 4 2	460
May	1st to 10th	Day	36% 19% 26% 10% 5% 3	463
	11th to 20th	Day	21% 20% 33% 18% 7% 2	487
	21st to end	Day	19% 13% 34% 20% 10% 4	529
June	1st to 10th	Day	22% 21% 31% 17% 8% 2	490
	11th to 20th	Day	19% 19% 28% 24% 8% 2	490
	21st to end	Day	23% 18% 32% 18% 7% 2	490
July	1st to 10th	Day	13% 12% 34% 25% 13% 3	485
	11th to 20th	Day	11% 11% 38% 26% 12% 2	484
	21st to end	Day	15% 13% 38% 22% 9% 2	532
August	1st to 10th	Day	12% 16% 30% 22% 15% 5%	486
	11th to 20th	Day	16% 13% 30% 23% 11% 7%	479
	21st to end	Day	16% 14% 30% 22% 12% 7%	539
September	1st to 10th	Day	21% 13% 24% 22% 14% 6%	490
	11th to 20th	Day	15% 13% 24% 22% 13% 12%	490
	21st to end	Day	21% 15% 29% 20% 9% 5%	490
October	1st to 10th	Day	26% 17% 26% 14% 12% 4	490
	11th to 20th	Day	26% 20% 26% 19% 7% 2	490
	21st to end	Day	31% 22% 26% 16% 5%	459
November	1st to 10th	Day	28% 21% 23% 19% 8% 1	386
	11th to 20th	Day	37% 24% 21% 13% 5% 1	370
	21st to end	Day	37% 23% 29% 10% 1	188
December	1st to 10th	Day	37% 28% 23% 8% 4	180
	11th to 20th	Day	38% 27% 28% 6% 1	180
	21st to end	Day	37% 28% 26% 7% 1 1	198
January	1st to 10th	Night	28% 29% 29% 11% 2	760
	11th to 20th	Night	30% 26% 26% 14% 3	760
	21st to end	Night	24% 32% 27% 14% 2	836
February	1st to 10th	Night	30% 24% 33% 12% 1	760
	11th to 20th	Night	30% 30% 28% 11% 1	743
	21st to end	Night	35% 25% 27% 12% 2	628
March	1st to 10th	Night	29% 28% 27% 14% 2	760
	11th to 20th	Night	29% 29% 24% 15% 3	760
	21st to end	Night	27% 26% 24% 16% 6%	836
April	1st to 10th	Night	27% 25% 28% 18% 3	760
	11th to 20th	Night	28% 23% 25% 17% 7%	751
	21st to end	Night	30% 20% 23% 20% 7%	730
May	1st to 10th	Night	29% 16% 25% 22% 8% 1	501
	11th to 20th	Night	20% 14% 32% 28% 5% 1	374
	21st to end	Night	16% 10% 29% 30% 14% 1	411
June	1st to 10th	Night	17% 15% 24% 31% 13%	380
	11th to 20th	Night	18% 12% 20% 37% 13%	380
	21st to end	Night	16% 8% 26% 37% 13% 1	380
July	1st to 10th	Night	14% 9% 22% 38% 15% 1	370
	11th to 20th	Night	13% 6% 26% 36% 19% 1	368
	21st to end	Night	12% 7% 23% 43% 15% 1	416
August	1st to 10th	Night	14% 7% 24% 32% 21% 1	458
	11th to 20th	Night	16% 7% 19% 36% 19% 3	701
	21st to end	Night	17% 8% 19% 31% 23% 2	836
September	1st to 10th	Night	18% 9% 27% 28% 16% 3	760
	11th to 20th	Night	19% 9% 22% 24% 20% 6%	760
	21st to end	Night	21% 13% 24% 25% 15% 3	760
October	1st to 10th	Night	26% 16% 20% 23% 13% 2	760
	11th to 20th	Night	24% 17% 26% 25% 8% 1	760
	21st to end	Night	31% 22% 24% 20% 3	836
November	1st to 10th	Night	23% 21% 28% 21% 7%	771
	11th to 20th	Night	29% 25% 24% 15% 5% 2	760
	21st to end	Night	25% 28% 25% 17% 4 1	760
December	1st to 10th	Night	31% 29% 24% 12% 4	760
	11th to 20th	Night	32% 26% 24% 15% 2	760
	21st to end	Night	32% 31% 23% 13% 2	836

Page generated at 2024-11-05 08:15:53. Version ac07

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