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 2025-05-26.

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	4 10% 4 11% 6% 5% 5% 4 6% 7% 37%	117779
	Night	3 8% 4 11% 7% 6% 6% 4 6% 7% 37%	120324
Transparency	Day	43% 8% 12% 19% 14% 5%	117521
	Night	42% 9% 13% 20% 13% 4	120172
Seeing	Day	15% 21% 32% 22% 9% 2	16112
	Night	10% 14% 31% 32% 12% 1	25766

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% 6% 22% 11% 8% 6% 5% 7% 6% 19%	3197
	11th to 20th	Day	8% 5% 15% 11% 8% 7% 4 6% 6% 30%	3660
	21st to end	Day	14% 8% 14% 6% 4 4 3 5% 6% 36%	4510
February	1st to 10th	Day	1 14% 10% 20% 11% 7% 5% 4 5% 6% 18%	1800
	11th to 20th	Day	1 14% 8% 22% 9% 5% 5% 4 5% 5% 22%	1755
	21st to end	Day	2 16% 8% 20% 11% 7% 5% 2 4 5% 20%	1590
March	1st to 10th	Day	1 12% 7% 15% 7% 4 4 3 4 6% 36%	4799
	11th to 20th	Day	2 14% 8% 16% 6% 4 4 3 5% 5% 33%	5000
	21st to end	Day	3 18% 9% 19% 9% 8% 6% 4 5% 5% 15%	5486
April	1st to 10th	Day	4 22% 6% 13% 7% 5% 5% 4 5% 6% 23%	2300
	11th to 20th	Day	5% 17% 6% 13% 7% 5% 4 4 5% 6% 28%	2567
	21st to end	Day	9% 19% 6% 11% 6% 5% 4 4 5% 6% 25%	2600
May	1st to 10th	Day	8% 19% 5% 10% 6% 6% 4 4 6% 6% 25%	4240
	11th to 20th	Day	6% 11% 3 9% 6% 6% 7% 5% 7% 8% 31%	4391
	21st to end	Day	11% 17% 4 9% 6% 5% 5% 4 5% 6% 28%	4897
June	1st to 10th	Day	11% 11% 3 9% 6% 6% 6% 5% 7% 7% 29%	2836
	11th to 20th	Day	12% 11% 4 9% 6% 4 4 4 5% 6% 33%	2850
	21st to end	Day	4 5% 2 6% 5% 5% 5% 4 7% 7% 50%	2850
July	1st to 10th	Day	3 3 1 4 4 4 5% 4 7% 8% 56%	4740
	11th to 20th	Day	2 3 1 5% 4 5% 5% 5% 7% 8% 54%	4660
	21st to end	Day	3 2 1 4 4 5% 6% 5% 7% 9% 53%	4490
August	1st to 10th	Day	4 4 2 6% 4 6% 6% 6% 8% 9% 44%	4092
	11th to 20th	Day	4 3 1 5% 4 4 4 4 6% 8% 57%	4028
	21st to end	Day	4 3 2 5% 4 4 5% 4 6% 6% 57%	4521
September	1st to 10th	Day	6% 6% 2 5% 4 4 3 3 5% 6% 57%	2261
	11th to 20th	Day	8% 8% 3 7% 3 4 4 4 5% 6% 48%	2090
	21st to end	Day	8% 7% 2 5% 3 4 3 4 5% 8% 51%	2090
October	1st to 10th	Day	6% 8% 2 5% 4 3 4 2 3 4 57%	3244
	11th to 20th	Day	5% 10% 3 7% 3 3 2 2 4 7% 54%	3150
	21st to end	Day	4 12% 4 10% 4 5% 5% 5% 6% 6% 38%	3291
November	1st to 10th	Day	5% 16% 5% 12% 4 4 4 4 5% 6% 34%	1714
	11th to 20th	Day	3 14% 6% 12% 8% 6% 5% 4 7% 8% 30%	1600
	21st to end	Day	2 11% 5% 12% 7% 7% 6% 4 6% 6% 34%	1600
December	1st to 10th	Day	1 7% 4 14% 7% 6% 6% 4 5% 7% 42%	2620
	11th to 20th	Day	1 9% 6% 20% 9% 8% 7% 5% 9% 8% 18%	2762
	21st to end	Day	1 10% 7% 21% 11% 6% 6% 4 6% 6% 23%	3498
January	1st to 10th	Night	1 6% 5% 23% 11% 9% 8% 5% 6% 7% 21%	6766
	11th to 20th	Night	1 6% 4 15% 12% 9% 8% 6% 7% 8% 24%	6324
	21st to end	Night	1 12% 7% 13% 6% 5% 6% 5% 6% 6% 32%	6468
February	1st to 10th	Night	1 11% 5% 18% 13% 8% 6% 5% 7% 6% 21%	2600
	11th to 20th	Night	1 11% 6% 18% 11% 7% 6% 5% 5% 6% 25%	2532
	21st to end	Night	1 12% 6% 17% 10% 9% 8% 5% 5% 6% 22%	2036
March	1st to 10th	Night	1 11% 5% 15% 8% 6% 5% 3 4 6% 36%	5095
	11th to 20th	Night	2 9% 5% 12% 6% 5% 4 3 6% 8% 40%	5000
	21st to end	Night	1 9% 5% 13% 8% 7% 7% 6% 9% 9% 26%	5489
April	1st to 10th	Night	4 14% 6% 12% 8% 6% 4 4 5% 6% 31%	2098
	11th to 20th	Night	5% 10% 3 10% 7% 5% 5% 4 7% 8% 36%	1781
	21st to end	Night	7% 15% 4 8% 5% 5% 4 4 5% 7% 36%	1800
May	1st to 10th	Night	7% 12% 4 10% 7% 6% 6% 5% 6% 7% 30%	2950
	11th to 20th	Night	5% 12% 3 8% 4 5% 5% 5% 6% 8% 40%	2730
	21st to end	Night	9% 15% 3 7% 6% 4 5% 5% 7% 9% 30%	2806
June	1st to 10th	Night	9% 8% 3 8% 6% 5% 4 5% 7% 9% 35%	1340
	11th to 20th	Night	10% 8% 3 6% 5% 5% 5% 5% 8% 7% 38%	1330
	21st to end	Night	3 3 1 5% 3 5% 4 4 6% 8% 58%	1330
July	1st to 10th	Night	3 3 1 4 3 3 3 3 6% 7% 62%	2220
	11th to 20th	Night	2 2 1 5% 4 3 4 4 6% 7% 62%	2282
	21st to end	Night	2 2 1 4 4 3 5% 4 7% 10% 59%	3071
August	1st to 10th	Night	3 2 1 5% 4 5% 6% 5% 8% 9% 52%	2847
	11th to 20th	Night	2 2 1 5% 4 4 5% 5% 7% 7% 57%	2811
	21st to end	Night	4 3 1 4 3 4 3 3 5% 6% 64%	3146
September	1st to 10th	Night	5% 5% 2 5% 3 4 4 3 4 6% 58%	1916
	11th to 20th	Night	6% 5% 2 5% 3 4 4 5% 5% 8% 53%	2090
	21st to end	Night	8% 6% 2 5% 2 3 3 3 4 6% 58%	2090
October	1st to 10th	Night	4 5% 2 4 3 3 3 3 4 6% 63%	3728
	11th to 20th	Night	6% 10% 3 5% 3 3 3 2 4 6% 54%	3778
	21st to end	Night	4 10% 4 8% 5% 6% 6% 4 6% 8% 39%	4264
November	1st to 10th	Night	6% 12% 5% 10% 7% 5% 6% 4 6% 7% 33%	2562
	11th to 20th	Night	2 12% 4 12% 9% 8% 7% 4 6% 7% 28%	2800
	21st to end	Night	2 8% 5% 11% 8% 6% 7% 6% 7% 9% 33%	2800
December	1st to 10th	Night	1 8% 4 12% 8% 5% 5% 4 5% 7% 41%	4570
	11th to 20th	Night	1 7% 5% 15% 12% 7% 7% 6% 9% 9% 21%	5416
	21st to end	Night	1 10% 6% 16% 11% 8% 7% 5% 6% 6% 22%	7458

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	61% 11% 12% 10% 6%	3197
	11th to 20th	Day	51% 9% 13% 12% 8% 6%	3660
	21st to end	Day	48% 8% 9% 17% 14% 4	4510
February	1st to 10th	Day	66% 10% 9% 11% 3	1800
	11th to 20th	Day	62% 10% 12% 12% 3 1	1764
	21st to end	Day	66% 8% 8% 11% 5% 2	1590
March	1st to 10th	Day	46% 9% 15% 14% 11% 5%	4799
	11th to 20th	Day	50% 7% 15% 21% 7%	5000
	21st to end	Day	64% 12% 13% 9% 1	5486
April	1st to 10th	Day	60% 8% 12% 14% 7%	2300
	11th to 20th	Day	54% 8% 14% 18% 6% 1	2570
	21st to end	Day	56% 7% 13% 18% 5%	2600
May	1st to 10th	Day	50% 11% 12% 21% 6% 1	4240
	11th to 20th	Day	41% 10% 17% 21% 10% 1	4395
	21st to end	Day	52% 9% 14% 19% 6%	4897
June	1st to 10th	Day	49% 11% 17% 19% 4	2836
	11th to 20th	Day	49% 7% 10% 18% 12% 4	2850
	21st to end	Day	28% 7% 11% 26% 22% 5%	2850
July	1st to 10th	Day	20% 6% 9% 18% 33% 15%	4666
	11th to 20th	Day	24% 4 8% 15% 25% 24%	4579
	21st to end	Day	22% 5% 8% 20% 30% 15%	4348
August	1st to 10th	Day	30% 7% 8% 19% 27% 8%	4078
	11th to 20th	Day	22% 4 9% 27% 32% 6%	4067
	21st to end	Day	25% 5% 7% 22% 31% 9%	4520
September	1st to 10th	Day	27% 5% 8% 22% 30% 9%	2261
	11th to 20th	Day	35% 5% 10% 24% 20% 5%	2090
	21st to end	Day	31% 6% 12% 29% 18% 4	2090
October	1st to 10th	Day	31% 4 8% 24% 31% 2	3244
	11th to 20th	Day	33% 3 14% 31% 17% 3	3150
	21st to end	Day	43% 9% 13% 26% 9% 1	3291
November	1st to 10th	Day	51% 9% 12% 19% 8% 1	1714
	11th to 20th	Day	51% 12% 17% 15% 5% 2	1600
	21st to end	Day	49% 10% 15% 15% 9% 2	1600
December	1st to 10th	Day	42% 9% 19% 21% 8% 2	2620
	11th to 20th	Day	62% 9% 13% 14% 2	2761
	21st to end	Day	56% 10% 9% 12% 5% 7%	3498
January	1st to 10th	Night	59% 10% 10% 13% 7%	6766
	11th to 20th	Night	51% 12% 10% 15% 7% 5%	6324
	21st to end	Night	48% 8% 9% 15% 14% 6%	6468
February	1st to 10th	Night	62% 9% 11% 11% 6% 1	2600
	11th to 20th	Night	59% 10% 12% 12% 7% 1	2533
	21st to end	Night	60% 9% 11% 11% 6% 3	2036
March	1st to 10th	Night	45% 12% 14% 15% 9% 6%	5095
	11th to 20th	Night	37% 10% 19% 27% 7%	5000
	21st to end	Night	44% 16% 17% 18% 4	5489
April	1st to 10th	Night	50% 10% 17% 17% 6% 1	2098
	11th to 20th	Night	41% 7% 19% 24% 7% 1	1781
	21st to end	Night	45% 9% 17% 23% 6%	1800
May	1st to 10th	Night	41% 12% 17% 20% 8%	2950
	11th to 20th	Night	36% 10% 14% 30% 7% 2	2731
	21st to end	Night	46% 11% 15% 22% 6%	2806
June	1st to 10th	Night	41% 11% 18% 22% 6%	1340
	11th to 20th	Night	38% 10% 15% 21% 13% 3	1330
	21st to end	Night	22% 6% 13% 28% 24% 7%	1330
July	1st to 10th	Night	19% 6% 10% 21% 38% 6%	2185
	11th to 20th	Night	18% 4 9% 15% 29% 24%	2240
	21st to end	Night	17% 5% 8% 26% 30% 14%	2975
August	1st to 10th	Night	24% 7% 9% 24% 26% 9%	2838
	11th to 20th	Night	22% 5% 9% 28% 28% 7%	2838
	21st to end	Night	21% 3 9% 24% 34% 9%	3146
September	1st to 10th	Night	25% 5% 9% 24% 26% 11%	1916
	11th to 20th	Night	28% 8% 14% 24% 20% 6%	2090
	21st to end	Night	28% 6% 12% 30% 20% 4	2090
October	1st to 10th	Night	23% 4 10% 29% 31% 3	3728
	11th to 20th	Night	32% 4 16% 27% 18% 2	3778
	21st to end	Night	40% 9% 13% 25% 13%	4264
November	1st to 10th	Night	49% 9% 15% 19% 8% 1	2562
	11th to 20th	Night	52% 10% 16% 15% 6% 1	2800
	21st to end	Night	46% 10% 17% 15% 10% 2	2800
December	1st to 10th	Night	43% 8% 19% 20% 9% 1	4570
	11th to 20th	Night	56% 11% 16% 15% 2	5417
	21st to end	Night	54% 13% 11% 13% 5% 4	7458

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	14% 29% 30% 22% 6% 1	200
	11th to 20th	Day	11% 32% 34% 13% 7% 2	205
	21st to end	Day	10% 19% 45% 22% 4	330
February	1st to 10th	Day	16% 36% 34% 11% 2	300
	11th to 20th	Day	20% 24% 33% 19% 3 2	300
	21st to end	Day	22% 28% 31% 17% 3	354
March	1st to 10th	Day	16% 36% 33% 12% 2 1	500
	11th to 20th	Day	20% 25% 31% 19% 5%	500
	21st to end	Day	19% 32% 29% 16% 3	550
April	1st to 10th	Day	22% 31% 29% 15% 3	500
	11th to 20th	Day	21% 31% 31% 14% 3	492
	21st to end	Day	23% 22% 32% 15% 6% 2	500
May	1st to 10th	Day	17% 21% 31% 22% 8% 1	503
	11th to 20th	Day	19% 15% 31% 21% 10% 3	640
	21st to end	Day	22% 15% 26% 22% 13% 2	760
June	1st to 10th	Day	15% 18% 25% 26% 14% 3	680
	11th to 20th	Day	22% 22% 28% 20% 7% 1	680
	21st to end	Day	10% 15% 29% 30% 14% 3	680
July	1st to 10th	Day	5% 14% 30% 34% 15% 2	671
	11th to 20th	Day	5% 11% 40% 30% 14%	627
	21st to end	Day	5% 15% 36% 29% 12% 3	531
August	1st to 10th	Day	9% 14% 33% 29% 12% 3	487
	11th to 20th	Day	7% 13% 30% 32% 15% 4	477
	21st to end	Day	9% 17% 34% 25% 11% 5%	539
September	1st to 10th	Day	9% 16% 37% 23% 12% 2	490
	11th to 20th	Day	18% 17% 33% 22% 8% 3	490
	21st to end	Day	16% 18% 33% 22% 10% 2	490
October	1st to 10th	Day	15% 19% 29% 22% 12% 3	348
	11th to 20th	Day	17% 21% 26% 18% 12% 5%	300
	21st to end	Day	20% 25% 31% 19% 5% 1	330
November	1st to 10th	Day	21% 25% 29% 16% 7% 2	300
	11th to 20th	Day	16% 26% 34% 19% 4 1	300
	21st to end	Day	11% 21% 38% 24% 5%	300
December	1st to 10th	Day	16% 20% 32% 22% 8% 2	300
	11th to 20th	Day	18% 31% 31% 16% 4	238
	21st to end	Day	16% 23% 35% 17% 8%	220
January	1st to 10th	Night	9% 22% 37% 27% 5%	1000
	11th to 20th	Night	8% 19% 40% 23% 9% 1	813
	21st to end	Night	7% 16% 41% 25% 10% 1	880
February	1st to 10th	Night	10% 22% 41% 23% 4 1	800
	11th to 20th	Night	8% 21% 36% 28% 7%	784
	21st to end	Night	10% 21% 36% 26% 7%	660
March	1st to 10th	Night	10% 20% 36% 28% 7% 1	800
	11th to 20th	Night	13% 14% 30% 32% 10% 1	800
	21st to end	Night	10% 17% 32% 32% 8% 1	880
April	1st to 10th	Night	12% 19% 31% 29% 8% 1	705
	11th to 20th	Night	11% 16% 35% 30% 8%	593
	21st to end	Night	16% 13% 29% 29% 13% 1	600
May	1st to 10th	Night	14% 12% 24% 36% 13% 1	600
	11th to 20th	Night	15% 9% 23% 34% 18% 1	591
	21st to end	Night	17% 12% 25% 31% 15% 1	634
June	1st to 10th	Night	13% 9% 19% 40% 19% 1	390
	11th to 20th	Night	14% 10% 28% 36% 12%	380
	21st to end	Night	4 4 21% 49% 22% 1	380
July	1st to 10th	Night	4 3 14% 49% 28% 3	370
	11th to 20th	Night	2 2 18% 57% 20%	368
	21st to end	Night	4 3 21% 47% 23% 2	599
August	1st to 10th	Night	6% 4 19% 45% 24% 2	567
	11th to 20th	Night	5% 3 17% 46% 27% 2	564
	21st to end	Night	7% 6% 22% 40% 24% 1	627
September	1st to 10th	Night	8% 3 23% 41% 23% 2	598
	11th to 20th	Night	9% 5% 21% 36% 26% 3	760
	21st to end	Night	12% 6% 24% 34% 20% 3	760
October	1st to 10th	Night	12% 6% 31% 35% 16% 1	760
	11th to 20th	Night	14% 9% 26% 33% 15% 2	760
	21st to end	Night	12% 15% 31% 30% 9% 3	836
November	1st to 10th	Night	14% 16% 32% 30% 7% 1	807
	11th to 20th	Night	13% 24% 33% 26% 4	1000
	21st to end	Night	9% 20% 35% 28% 7% 1	1000
December	1st to 10th	Night	12% 18% 36% 28% 6% 1	1000
	11th to 20th	Night	11% 21% 38% 24% 5% 1	1000
	21st to end	Night	11% 22% 37% 24% 5%	1100

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