Taylor Fork
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Taylor Fork clear sky chart from 2005-11-06 to 2024-03-08.

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	6% 11% 5% 10% 8% 4 5% 5% 5% 7% 34%	78379
	Night	4 9% 5% 11% 9% 4 6% 5% 6% 7% 35%	81204
Transparency	Day	47% 8% 12% 17% 11% 4	78081
	Night	46% 9% 14% 18% 10% 3	81024
Seeing	Day	15% 21% 32% 22% 9% 2	14442
	Night	10% 14% 30% 32% 12% 1	24184

By Month

Percentage Cloud Cover SW (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	1 8% 8% 21% 14% 5% 7% 5% 5% 7% 20%	2223
	11th to 20th	Day	1 10% 8% 13% 14% 5% 6% 4 5% 6% 28%	2546
	21st to end	Day	1 19% 11% 15% 9% 3 4 3 3 5% 27%	3146
February	1st to 10th	Day	1 12% 11% 17% 11% 5% 6% 5% 4 6% 19%	1710
	11th to 20th	Day	1 14% 9% 19% 11% 4 5% 5% 5% 5% 23%	1665
	21st to end	Day	2 14% 11% 19% 13% 6% 5% 3 4 5% 19%	1513
March	1st to 10th	Day	2 15% 7% 16% 11% 4 6% 6% 5% 6% 22%	1987
	11th to 20th	Day	4 15% 8% 11% 8% 4 6% 5% 5% 7% 27%	1980
	21st to end	Day	6% 18% 10% 15% 10% 5% 6% 5% 4 5% 18%	2178
April	1st to 10th	Day	5% 21% 7% 12% 8% 4 5% 5% 5% 6% 22%	2069
	11th to 20th	Day	6% 16% 7% 12% 9% 4 4 5% 5% 6% 26%	2307
	21st to end	Day	10% 18% 6% 10% 7% 4 4 4 5% 6% 26%	2340
May	1st to 10th	Day	9% 15% 6% 9% 7% 5% 5% 5% 6% 7% 27%	2340
	11th to 20th	Day	10% 11% 4 9% 8% 5% 7% 6% 6% 8% 26%	2401
	21st to end	Day	16% 17% 5% 9% 7% 4 6% 5% 5% 6% 20%	2724
June	1st to 10th	Day	12% 10% 4 8% 7% 4 6% 6% 7% 7% 28%	2686
	11th to 20th	Day	13% 11% 5% 9% 7% 4 4 5% 4 6% 32%	2700
	21st to end	Day	4 5% 2 5% 6% 3 5% 5% 7% 8% 49%	2700
July	1st to 10th	Day	4 3 2 4 5% 3 6% 6% 8% 10% 49%	2700
	11th to 20th	Day	3 3 1 5% 5% 3 5% 5% 6% 7% 57%	2662
	21st to end	Day	4 3 2 4 5% 4 5% 5% 6% 7% 54%	2568
August	1st to 10th	Day	7% 5% 2 6% 5% 4 5% 5% 7% 8% 45%	2328
	11th to 20th	Day	4 3 2 5% 6% 4 4 6% 6% 7% 55%	2299
	21st to end	Day	6% 3 2 4 6% 3 5% 5% 6% 7% 52%	2574
September	1st to 10th	Day	6% 6% 2 5% 4 2 4 3 5% 6% 57%	2143
	11th to 20th	Day	8% 8% 2 6% 4 3 4 5% 5% 6% 49%	1980
	21st to end	Day	9% 7% 2 5% 4 4 3 4 5% 8% 49%	1980
October	1st to 10th	Day	11% 14% 4 7% 6% 3 4 4 5% 5% 36%	1846
	11th to 20th	Day	8% 13% 4 8% 5% 3 4 3 4 5% 42%	1800
	21st to end	Day	4 13% 4 9% 6% 3 5% 5% 5% 7% 37%	1895
November	1st to 10th	Day	6% 15% 6% 11% 5% 4 4 5% 5% 6% 33%	1627
	11th to 20th	Day	3 12% 7% 11% 8% 5% 5% 5% 7% 7% 30%	1520
	21st to end	Day	2 9% 7% 10% 9% 5% 6% 6% 6% 6% 35%	1520
December	1st to 10th	Day	2 10% 6% 13% 10% 6% 8% 6% 6% 7% 25%	1520
	11th to 20th	Day	2 13% 8% 17% 9% 5% 7% 6% 7% 7% 20%	1760
	21st to end	Day	2 11% 8% 14% 11% 4 5% 5% 5% 6% 29%	2442
January	1st to 10th	Night	2 6% 6% 20% 14% 6% 7% 6% 6% 7% 21%	4726
	11th to 20th	Night	1 7% 6% 15% 16% 7% 7% 5% 6% 7% 24%	4437
	21st to end	Night	2 17% 11% 16% 9% 4 6% 5% 4 5% 21%	4521
February	1st to 10th	Night	1 10% 6% 15% 14% 6% 6% 6% 6% 6% 22%	2470
	11th to 20th	Night	1 10% 7% 16% 13% 5% 7% 6% 5% 6% 25%	2402
	21st to end	Night	2 9% 8% 15% 12% 7% 8% 7% 5% 6% 21%	1938
March	1st to 10th	Night	1 11% 7% 13% 10% 4 8% 5% 5% 8% 28%	2133
	11th to 20th	Night	4 10% 4 9% 6% 5% 6% 6% 5% 8% 37%	1980
	21st to end	Night	4 13% 6% 13% 10% 4 6% 7% 6% 8% 26%	2178
April	1st to 10th	Night	4 12% 7% 11% 9% 5% 5% 5% 5% 6% 30%	1890
	11th to 20th	Night	6% 8% 4 9% 8% 4 6% 5% 7% 8% 34%	1601
	21st to end	Night	7% 14% 4 7% 5% 3 4 5% 5% 7% 37%	1620
May	1st to 10th	Night	7% 10% 2 6% 8% 6% 5% 5% 7% 9% 34%	1620
	11th to 20th	Night	8% 10% 3 6% 6% 4 7% 6% 7% 8% 35%	1490
	21st to end	Night	14% 12% 4 8% 7% 3 6% 6% 6% 9% 25%	1552
June	1st to 10th	Night	10% 8% 3 7% 7% 4 4 5% 7% 9% 36%	1270
	11th to 20th	Night	11% 8% 3 5% 6% 3 5% 6% 8% 7% 38%	1260
	21st to end	Night	4 3 1 4 4 3 5% 4 5% 8% 58%	1260
July	1st to 10th	Night	3 2 3 3 3 5% 5% 8% 10% 57%	1260
	11th to 20th	Night	2 2 1 4 4 3 4 3 6% 7% 63%	1294
	21st to end	Night	3 2 1 3 5% 2 5% 6% 7% 8% 58%	1749
August	1st to 10th	Night	5% 3 2 6% 6% 3 5% 5% 7% 8% 50%	1611
	11th to 20th	Night	3 3 1 4 4 3 4 5% 6% 7% 61%	1602
	21st to end	Night	5% 3 2 5% 5% 3 4 5% 5% 7% 57%	1782
September	1st to 10th	Night	6% 4 2 5% 4 3 5% 4 4 6% 57%	1814
	11th to 20th	Night	6% 5% 2 4 4 3 4 5% 5% 8% 55%	1980
	21st to end	Night	9% 6% 2 4 3 3 3 3 4 6% 56%	1980
October	1st to 10th	Night	8% 8% 4 6% 5% 3 4 5% 5% 7% 45%	2114
	11th to 20th	Night	7% 11% 5% 6% 4 2 3 3 4 6% 48%	2160
	21st to end	Night	4 9% 4 8% 7% 4 6% 5% 6% 8% 40%	2458
November	1st to 10th	Night	6% 11% 5% 9% 7% 4 6% 6% 6% 7% 33%	2430
	11th to 20th	Night	3 11% 5% 10% 11% 5% 8% 6% 6% 7% 28%	2660
	21st to end	Night	2 7% 6% 10% 8% 4 7% 7% 6% 8% 34%	2660
December	1st to 10th	Night	2 10% 6% 15% 13% 6% 8% 5% 6% 6% 23%	2660
	11th to 20th	Night	2 9% 7% 15% 12% 5% 7% 6% 6% 7% 24%	3428
	21st to end	Night	2 11% 8% 13% 12% 5% 6% 6% 6% 6% 26%	5214

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% 12% 11% 11% 3	2223
	11th to 20th	Day	55% 9% 13% 9% 8% 6%	2546
	21st to end	Day	62% 9% 9% 14% 5% 1	3146
February	1st to 10th	Day	65% 10% 10% 12% 3	1710
	11th to 20th	Day	62% 10% 12% 12% 3 1	1674
	21st to end	Day	67% 8% 8% 9% 4 3	1513
March	1st to 10th	Day	60% 10% 13% 12% 5% 1	1987
	11th to 20th	Day	55% 8% 14% 14% 8% 1	1980
	21st to end	Day	67% 8% 13% 11% 2	2178
April	1st to 10th	Day	62% 7% 11% 13% 6%	2069
	11th to 20th	Day	56% 8% 14% 17% 5%	2310
	21st to end	Day	56% 7% 14% 18% 4	2340
May	1st to 10th	Day	51% 9% 14% 19% 6% 1	2340
	11th to 20th	Day	51% 9% 18% 16% 6%	2405
	21st to end	Day	63% 8% 14% 11% 4	2724
June	1st to 10th	Day	50% 11% 17% 19% 3	2686
	11th to 20th	Day	50% 8% 10% 18% 11% 3	2700
	21st to end	Day	29% 8% 12% 25% 22% 5%	2700
July	1st to 10th	Day	24% 7% 12% 25% 24% 7%	2626
	11th to 20th	Day	24% 5% 9% 20% 24% 18%	2581
	21st to end	Day	26% 5% 9% 17% 28% 16%	2425
August	1st to 10th	Day	33% 7% 10% 20% 23% 8%	2313
	11th to 20th	Day	25% 5% 11% 26% 26% 7%	2299
	21st to end	Day	28% 6% 10% 24% 25% 8%	2574
September	1st to 10th	Day	28% 5% 8% 20% 30% 9%	2143
	11th to 20th	Day	34% 5% 10% 24% 21% 5%	1980
	21st to end	Day	32% 6% 12% 29% 17% 3	1980
October	1st to 10th	Day	47% 6% 13% 20% 12% 1	1846
	11th to 20th	Day	45% 5% 16% 24% 9% 1	1800
	21st to end	Day	44% 9% 16% 21% 8% 1	1895
November	1st to 10th	Day	51% 9% 13% 19% 7% 1	1627
	11th to 20th	Day	51% 12% 16% 15% 4 2	1520
	21st to end	Day	49% 10% 14% 15% 10% 2	1520
December	1st to 10th	Day	57% 11% 11% 11% 8% 2	1520
	11th to 20th	Day	63% 9% 12% 13% 2 1	1759
	21st to end	Day	51% 11% 9% 13% 6% 10%	2442
January	1st to 10th	Night	58% 11% 12% 13% 6% 1	4726
	11th to 20th	Night	56% 12% 10% 12% 7% 4	4437
	21st to end	Night	64% 9% 10% 10% 5% 1	4521
February	1st to 10th	Night	63% 9% 11% 12% 5%	2470
	11th to 20th	Night	59% 10% 12% 11% 6% 1	2403
	21st to end	Night	61% 9% 11% 11% 5% 3	1938
March	1st to 10th	Night	51% 11% 14% 16% 6% 2	2133
	11th to 20th	Night	44% 10% 17% 19% 9%	1980
	21st to end	Night	54% 11% 18% 14% 4	2178
April	1st to 10th	Night	51% 10% 17% 16% 6% 1	1890
	11th to 20th	Night	43% 8% 20% 23% 6% 1	1601
	21st to end	Night	43% 9% 19% 24% 6%	1620
May	1st to 10th	Night	40% 10% 20% 23% 7%	1620
	11th to 20th	Night	40% 10% 18% 24% 8%	1491
	21st to end	Night	54% 10% 16% 14% 6%	1552
June	1st to 10th	Night	42% 11% 19% 22% 6%	1270
	11th to 20th	Night	39% 10% 16% 21% 11% 3	1260
	21st to end	Night	22% 6% 14% 29% 23% 7%	1260
July	1st to 10th	Night	17% 8% 16% 27% 24% 8%	1225
	11th to 20th	Night	17% 6% 13% 18% 28% 18%	1252
	21st to end	Night	18% 5% 12% 22% 29% 13%	1652
August	1st to 10th	Night	28% 8% 13% 21% 23% 7%	1602
	11th to 20th	Night	20% 5% 13% 28% 26% 8%	1602
	21st to end	Night	25% 5% 11% 23% 28% 8%	1782
September	1st to 10th	Night	26% 5% 9% 23% 26% 11%	1814
	11th to 20th	Night	27% 8% 15% 24% 21% 6%	1980
	21st to end	Night	29% 6% 12% 30% 19% 3	1980
October	1st to 10th	Night	37% 5% 17% 25% 15% 1	2114
	11th to 20th	Night	37% 5% 16% 29% 11% 2	2160
	21st to end	Night	40% 10% 16% 23% 10% 1	2458
November	1st to 10th	Night	49% 9% 15% 19% 7% 1	2430
	11th to 20th	Night	52% 10% 16% 15% 5% 2	2660
	21st to end	Night	46% 10% 17% 15% 10% 2	2660
December	1st to 10th	Night	60% 10% 12% 10% 6% 2	2660
	11th to 20th	Night	59% 9% 14% 15% 3	3429
	21st to end	Night	53% 11% 10% 15% 5% 6%	5214

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	13% 24% 31% 24% 6% 1	180
	11th to 20th	Day	11% 28% 35% 15% 8% 3	184
	21st to end	Day	9% 20% 46% 20% 4	297
February	1st to 10th	Day	11% 38% 36% 12% 2	270
	11th to 20th	Day	19% 23% 34% 19% 3 2	270
	21st to end	Day	21% 28% 30% 18% 3	325
March	1st to 10th	Day	17% 36% 33% 11% 2 1	449
	11th to 20th	Day	18% 26% 33% 18% 5%	420
	21st to end	Day	19% 33% 28% 16% 4	462
April	1st to 10th	Day	23% 32% 30% 11% 3	420
	11th to 20th	Day	21% 32% 30% 14% 3	412
	21st to end	Day	23% 22% 30% 16% 6% 2	420
May	1st to 10th	Day	15% 22% 31% 22% 9% 1	423
	11th to 20th	Day	18% 15% 31% 22% 11% 3	548
	21st to end	Day	23% 14% 25% 22% 14% 2	679
June	1st to 10th	Day	15% 18% 24% 26% 14% 4	630
	11th to 20th	Day	21% 22% 28% 20% 7% 1	630
	21st to end	Day	9% 13% 29% 30% 15% 3	630
July	1st to 10th	Day	4 13% 30% 35% 16% 2	621
	11th to 20th	Day	5% 11% 41% 30% 14%	580
	21st to end	Day	6% 14% 36% 30% 13% 3	487
August	1st to 10th	Day	10% 13% 33% 29% 12% 2	447
	11th to 20th	Day	7% 11% 28% 33% 16% 4	437
	21st to end	Day	7% 17% 34% 26% 11% 5%	495
September	1st to 10th	Day	9% 16% 37% 24% 12% 2	450
	11th to 20th	Day	17% 16% 32% 23% 8% 4	450
	21st to end	Day	15% 18% 33% 22% 10% 2	450
October	1st to 10th	Day	16% 19% 28% 22% 12% 3	316
	11th to 20th	Day	18% 22% 27% 17% 13% 4	270
	21st to end	Day	19% 24% 31% 21% 5% 1	297
November	1st to 10th	Day	23% 22% 31% 16% 7% 2	270
	11th to 20th	Day	13% 26% 36% 20% 4 1	270
	21st to end	Day	10% 19% 40% 26% 6%	270
December	1st to 10th	Day	17% 21% 31% 21% 7% 2	270
	11th to 20th	Day	17% 33% 29% 18% 4	215
	21st to end	Day	15% 23% 34% 18% 9% 1	198
January	1st to 10th	Night	9% 21% 36% 28% 6%	950
	11th to 20th	Night	8% 19% 39% 23% 9% 1	773
	21st to end	Night	7% 15% 42% 25% 10% 1	836
February	1st to 10th	Night	8% 22% 41% 24% 4 1	760
	11th to 20th	Night	8% 21% 35% 29% 7%	744
	21st to end	Night	9% 21% 36% 27% 7%	628
March	1st to 10th	Night	10% 20% 35% 28% 6% 1	750
	11th to 20th	Night	12% 13% 31% 33% 10% 1	720
	21st to end	Night	11% 16% 32% 31% 9% 1	792
April	1st to 10th	Night	12% 19% 31% 29% 9% 1	635
	11th to 20th	Night	11% 17% 36% 28% 9%	533
	21st to end	Night	16% 12% 28% 30% 14% 1	540
May	1st to 10th	Night	13% 11% 26% 34% 14% 1	540
	11th to 20th	Night	14% 7% 24% 35% 19% 1	531
	21st to end	Night	17% 12% 24% 30% 15% 1	584
June	1st to 10th	Night	13% 8% 19% 39% 20% 1	370
	11th to 20th	Night	14% 10% 28% 36% 13%	360
	21st to end	Night	4 4 19% 49% 23% 1	360
July	1st to 10th	Night	3 3 14% 49% 28% 3	350
	11th to 20th	Night	3 2 19% 56% 20%	348
	21st to end	Night	4 3 21% 47% 23% 2	567
August	1st to 10th	Night	6% 4 18% 45% 25% 1	537
	11th to 20th	Night	5% 3 16% 46% 28% 2	534
	21st to end	Night	7% 5% 22% 41% 25% 1	594
September	1st to 10th	Night	8% 3 24% 41% 22% 2	566
	11th to 20th	Night	9% 4 20% 37% 28% 3	720
	21st to end	Night	13% 6% 24% 34% 20% 3	720
October	1st to 10th	Night	13% 6% 30% 34% 16% 2	720
	11th to 20th	Night	13% 10% 27% 33% 15% 2	720
	21st to end	Night	11% 15% 31% 31% 9% 3	792
November	1st to 10th	Night	14% 16% 31% 30% 7% 1	765
	11th to 20th	Night	11% 24% 34% 26% 5%	950
	21st to end	Night	9% 19% 35% 30% 8% 1	950
December	1st to 10th	Night	12% 18% 36% 27% 6% 1	950
	11th to 20th	Night	10% 20% 38% 25% 5% 1	950
	21st to end	Night	11% 22% 37% 25% 6%	1045

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