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 2026-09-29.

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 9% 4 10% 6% 5% 5% 4 6% 7% 40%	158378
	Night	3 7% 4 10% 7% 6% 6% 4 6% 8% 40%	150505
Transparency	Day	41% 8% 11% 20% 16% 5%	153078
	Night	40% 9% 13% 21% 14% 4	146813
Seeing	Day	16% 21% 32% 21% 8% 2	18015
	Night	11% 14% 31% 32% 12% 1	27427

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 7% 7% 28% 12% 7% 6% 4 6% 6% 16%	4142
	11th to 20th	Day	6% 4 12% 9% 7% 5% 4 6% 7% 41%	4774
	21st to end	Day	11% 6% 12% 6% 5% 5% 4 6% 7% 37%	5844
February	1st to 10th	Day	1 13% 10% 20% 10% 7% 6% 4 4 6% 19%	1890
	11th to 20th	Day	1 14% 8% 22% 9% 5% 5% 4 5% 5% 22%	1845
	21st to end	Day	1 16% 8% 19% 11% 7% 5% 2 4 5% 22%	1667
March	1st to 10th	Day	1 12% 7% 15% 7% 5% 4 3 4 6% 36%	4905
	11th to 20th	Day	2 14% 8% 16% 6% 4 4 3 5% 5% 33%	5110
	21st to end	Day	3 18% 9% 19% 9% 8% 6% 4 5% 5% 15%	5607
April	1st to 10th	Day	4 21% 6% 13% 7% 5% 5% 4 6% 6% 24%	2415
	11th to 20th	Day	4 17% 6% 13% 7% 6% 4 4 5% 6% 28%	2697
	21st to end	Day	9% 19% 6% 12% 6% 5% 4 3 5% 6% 25%	2730
May	1st to 10th	Day	6% 12% 4 7% 5% 4 4 4 7% 9% 38%	7626
	11th to 20th	Day	5% 13% 5% 11% 6% 5% 6% 4 6% 8% 30%	7948
	21st to end	Day	9% 12% 4 8% 5% 5% 6% 4 6% 7% 33%	9026
June	1st to 10th	Day	10% 10% 3 9% 6% 6% 6% 5% 7% 7% 31%	3134
	11th to 20th	Day	11% 10% 4 9% 6% 4 4 4 5% 7% 35%	3150
	21st to end	Day	4 6% 2 7% 5% 5% 5% 4 7% 7% 48%	3150
July	1st to 10th	Day	2 2 2 5% 4 5% 6% 5% 8% 9% 53%	8819
	11th to 20th	Day	2 3 1 5% 4 5% 6% 5% 7% 9% 53%	8684
	21st to end	Day	2 3 1 5% 4 5% 6% 5% 8% 10% 50%	8366
August	1st to 10th	Day	2 2 1 4 3 5% 5% 5% 7% 8% 57%	7549
	11th to 20th	Day	3 3 1 5% 4 5% 6% 5% 7% 8% 52%	7565
	21st to end	Day	8% 5% 2 5% 4 4 5% 4 7% 8% 49%	8374
September	1st to 10th	Day	6% 5% 2 5% 4 4 3 3 5% 6% 57%	2498
	11th to 20th	Day	8% 8% 3 7% 4 5% 4 4 5% 6% 47%	2310
	21st to end	Day	7% 7% 2 5% 4 5% 3 4 5% 8% 51%	2289
October	1st to 10th	Day	6% 8% 2 5% 4 3 4 2 3 4 57%	3346
	11th to 20th	Day	5% 11% 3 7% 4 3 2 2 4 7% 53%	3250
	21st to end	Day	4 12% 4 10% 4 5% 5% 5% 6% 6% 40%	3396
November	1st to 10th	Day	5% 16% 5% 12% 4 4 4 4 5% 7% 34%	1801
	11th to 20th	Day	3 14% 6% 12% 8% 5% 5% 4 7% 8% 29%	1680
	21st to end	Day	2 10% 5% 12% 7% 7% 6% 4 6% 6% 35%	1680
December	1st to 10th	Day	1 7% 4 14% 7% 6% 6% 4 5% 7% 41%	2700
	11th to 20th	Day	1 9% 6% 20% 9% 8% 7% 5% 8% 8% 19%	2836
	21st to end	Day	1 10% 7% 21% 11% 6% 6% 4 6% 6% 24%	3575
January	1st to 10th	Night	1 6% 5% 25% 12% 9% 8% 5% 6% 6% 19%	8768
	11th to 20th	Night	4 3 12% 9% 7% 7% 5% 7% 12% 33%	8211
	21st to end	Night	1 10% 6% 12% 6% 7% 7% 5% 7% 8% 32%	8370
February	1st to 10th	Night	1 11% 5% 17% 12% 7% 6% 5% 7% 6% 23%	2730
	11th to 20th	Night	1 10% 6% 18% 11% 7% 7% 5% 5% 6% 24%	2662
	21st to end	Night	1 11% 6% 16% 9% 9% 8% 5% 5% 6% 23%	2135
March	1st to 10th	Night	1 11% 5% 15% 8% 6% 5% 3 4 6% 36%	5209
	11th to 20th	Night	2 9% 5% 12% 6% 5% 5% 3 5% 8% 40%	5110
	21st to end	Night	1 9% 5% 13% 7% 6% 7% 6% 9% 9% 26%	5610
April	1st to 10th	Night	3 13% 6% 12% 8% 6% 4 4 5% 6% 32%	2203
	11th to 20th	Night	5% 10% 3 10% 7% 5% 5% 4 7% 8% 36%	1871
	21st to end	Night	7% 14% 4 8% 5% 5% 4 4 5% 7% 36%	1890
May	1st to 10th	Night	6% 8% 3 7% 5% 4 4 3 6% 7% 47%	5321
	11th to 20th	Night	6% 13% 3 9% 4 4 5% 4 6% 8% 37%	4940
	21st to end	Night	7% 10% 3 6% 5% 4 5% 5% 7% 9% 39%	5181
June	1st to 10th	Night	8% 8% 3 8% 6% 5% 5% 5% 7% 9% 37%	1481
	11th to 20th	Night	9% 7% 3 6% 5% 4 5% 5% 8% 7% 41%	1470
	21st to end	Night	4 4 1 6% 3 5% 4 4 6% 8% 57%	1470
July	1st to 10th	Night	2 2 1 4 4 4 4 4 7% 10% 59%	4140
	11th to 20th	Night	1 2 1 4 3 3 4 4 6% 8% 62%	4258
	21st to end	Night	1 2 1 4 4 4 6% 4 8% 10% 56%	5739
August	1st to 10th	Night	2 2 1 3 3 4 5% 4 6% 9% 61%	5273
	11th to 20th	Night	2 2 1 5% 4 5% 5% 4 7% 7% 57%	5291
	21st to end	Night	5% 6% 2 5% 3 4 3 3 6% 8% 54%	5842
September	1st to 10th	Night	5% 4 2 5% 3 4 4 3 5% 6% 58%	2118
	11th to 20th	Night	6% 5% 2 5% 4 4 4 5% 6% 8% 51%	2310
	21st to end	Night	8% 6% 2 5% 2 3 3 3 4 6% 59%	2288
October	1st to 10th	Night	4 5% 2 4 3 3 3 3 4 6% 62%	3846
	11th to 20th	Night	6% 11% 3 5% 3 3 3 3 4 6% 53%	3898
	21st to end	Night	4 10% 4 8% 5% 5% 6% 4 6% 8% 40%	4401
November	1st to 10th	Night	5% 11% 4 10% 7% 5% 6% 4 6% 7% 34%	2694
	11th to 20th	Night	2 11% 4 12% 9% 8% 7% 5% 6% 7% 28%	2940
	21st to end	Night	2 8% 4 11% 8% 6% 7% 6% 7% 8% 34%	2940
December	1st to 10th	Night	1 7% 4 13% 8% 6% 6% 4 5% 7% 41%	4710
	11th to 20th	Night	1 7% 5% 14% 12% 7% 7% 6% 9% 9% 22%	5562
	21st to end	Night	1 10% 6% 16% 11% 8% 7% 5% 6% 6% 22%	7623

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	66% 10% 11% 8% 5%	4143
	11th to 20th	Day	41% 8% 18% 14% 11% 8%	4774
	21st to end	Day	44% 9% 12% 16% 15% 5%	5844
February	1st to 10th	Day	64% 10% 10% 12% 4	1890
	11th to 20th	Day	62% 10% 11% 12% 4 1	1854
	21st to end	Day	64% 8% 8% 13% 6% 2	1667
March	1st to 10th	Day	46% 9% 15% 14% 11% 5%	4905
	11th to 20th	Day	50% 7% 15% 21% 7%	5110
	21st to end	Day	64% 12% 13% 10% 2	5607
April	1st to 10th	Day	59% 8% 12% 15% 6%	2415
	11th to 20th	Day	54% 8% 14% 18% 6% 1	2700
	21st to end	Day	57% 7% 13% 18% 5%	2730
May	1st to 10th	Day	36% 8% 11% 32% 12% 1	7626
	11th to 20th	Day	47% 9% 12% 19% 12% 2	7952
	21st to end	Day	45% 9% 13% 23% 10%	9027
June	1st to 10th	Day	47% 10% 16% 20% 6%	3134
	11th to 20th	Day	46% 7% 9% 20% 14% 4	3150
	21st to end	Day	30% 7% 10% 25% 22% 5%	3150
July	1st to 10th	Day	23% 6% 7% 22% 29% 13%	8746
	11th to 20th	Day	24% 5% 7% 21% 25% 17%	8603
	21st to end	Day	25% 6% 8% 19% 30% 11%	8180
August	1st to 10th	Day	22% 5% 6% 16% 29% 22%	5978
	11th to 20th	Day	28% 6% 11% 24% 26% 5%	5964
	21st to end	Day	29% 7% 9% 22% 26% 6%	6569
September	1st to 10th	Day	26% 5% 8% 23% 30% 8%	2498
	11th to 20th	Day	36% 6% 10% 23% 21% 5%	2310
	21st to end	Day	31% 6% 12% 29% 19% 4	2289
October	1st to 10th	Day	31% 4 8% 24% 31% 2	3346
	11th to 20th	Day	34% 3 14% 30% 16% 3	3250
	21st to end	Day	42% 9% 12% 27% 9% 1	3396
November	1st to 10th	Day	50% 9% 14% 19% 7% 1	1801
	11th to 20th	Day	51% 11% 17% 14% 4 2	1680
	21st to end	Day	49% 10% 15% 15% 10% 2	1680
December	1st to 10th	Day	42% 9% 18% 21% 8% 2	2700
	11th to 20th	Day	60% 9% 13% 14% 2 1	2835
	21st to end	Day	56% 10% 10% 12% 5% 7%	3575
January	1st to 10th	Night	61% 11% 10% 12% 6%	8769
	11th to 20th	Night	41% 11% 17% 17% 7% 6%	8211
	21st to end	Night	46% 8% 11% 15% 15% 6%	8370
February	1st to 10th	Night	61% 9% 12% 11% 6% 1	2730
	11th to 20th	Night	59% 10% 11% 11% 7% 1	2663
	21st to end	Night	59% 8% 11% 13% 6% 3	2135
March	1st to 10th	Night	45% 12% 14% 15% 9% 5%	5209
	11th to 20th	Night	37% 10% 19% 27% 7%	5110
	21st to end	Night	44% 17% 16% 18% 5%	5610
April	1st to 10th	Night	49% 10% 16% 18% 6% 1	2203
	11th to 20th	Night	41% 7% 20% 24% 8% 1	1871
	21st to end	Night	44% 9% 17% 24% 7%	1890
May	1st to 10th	Night	31% 8% 15% 34% 12%	5319
	11th to 20th	Night	40% 8% 11% 28% 9% 3	4941
	21st to end	Night	38% 10% 15% 28% 8%	5182
June	1st to 10th	Night	41% 10% 17% 23% 8%	1481
	11th to 20th	Night	36% 9% 15% 20% 16% 3	1470
	21st to end	Night	23% 6% 13% 28% 23% 6%	1470
July	1st to 10th	Night	19% 5% 8% 25% 36% 7%	4105
	11th to 20th	Night	18% 4 10% 22% 28% 17%	4216
	21st to end	Night	19% 6% 9% 26% 31% 9%	5613
August	1st to 10th	Night	18% 5% 7% 20% 29% 21%	4168
	11th to 20th	Night	27% 7% 12% 25% 24% 5%	4168
	21st to end	Night	25% 5% 13% 26% 24% 6%	4578
September	1st to 10th	Night	25% 5% 9% 24% 27% 10%	2118
	11th to 20th	Night	29% 8% 14% 25% 20% 5%	2310
	21st to end	Night	27% 6% 12% 30% 21% 4	2288
October	1st to 10th	Night	23% 4 10% 28% 31% 3	3846
	11th to 20th	Night	33% 5% 16% 26% 18% 2	3898
	21st to end	Night	39% 8% 13% 25% 13% 1	4401
November	1st to 10th	Night	47% 9% 15% 20% 8% 1	2694
	11th to 20th	Night	51% 10% 16% 15% 5% 1	2940
	21st to end	Night	46% 10% 17% 15% 10% 2	2940
December	1st to 10th	Night	43% 9% 19% 20% 9% 1	4710
	11th to 20th	Night	55% 11% 16% 15% 3 1	5563
	21st to end	Night	54% 13% 11% 13% 5% 4	7623

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	15% 30% 28% 20% 5% 1	220
	11th to 20th	Day	12% 32% 35% 12% 7% 2	226
	21st to end	Day	10% 19% 46% 21% 4	363
February	1st to 10th	Day	16% 35% 35% 11% 2 1	330
	11th to 20th	Day	20% 25% 32% 19% 3 2	330
	21st to end	Day	25% 27% 30% 16% 3	383
March	1st to 10th	Day	17% 36% 32% 12% 2 1	540
	11th to 20th	Day	23% 25% 29% 17% 5%	540
	21st to end	Day	21% 32% 28% 15% 3	594
April	1st to 10th	Day	22% 30% 29% 15% 3	540
	11th to 20th	Day	21% 30% 31% 14% 3	532
	21st to end	Day	24% 22% 32% 15% 5% 2	540
May	1st to 10th	Day	17% 21% 32% 22% 8% 1	543
	11th to 20th	Day	21% 15% 31% 20% 10% 3	686
	21st to end	Day	21% 16% 26% 23% 13% 2	844
June	1st to 10th	Day	15% 19% 26% 24% 13% 3	780
	11th to 20th	Day	22% 24% 28% 19% 7% 1	780
	21st to end	Day	12% 16% 29% 29% 13% 2	780
July	1st to 10th	Day	5% 15% 31% 33% 14% 2	771
	11th to 20th	Day	5% 12% 40% 29% 14% 1	723
	21st to end	Day	5% 15% 38% 27% 12% 2	619
August	1st to 10th	Day	9% 16% 35% 27% 11% 2	567
	11th to 20th	Day	8% 14% 32% 30% 13% 3	557
	21st to end	Day	10% 18% 34% 24% 10% 5%	627
September	1st to 10th	Day	10% 17% 35% 23% 12% 3	570
	11th to 20th	Day	18% 17% 32% 22% 7% 3	570
	21st to end	Day	15% 17% 32% 23% 10% 3	563
October	1st to 10th	Day	16% 21% 28% 21% 12% 3	380
	11th to 20th	Day	21% 20% 26% 17% 11% 5%	330
	21st to end	Day	20% 25% 30% 19% 6% 1	363
November	1st to 10th	Day	23% 25% 29% 15% 7% 2	330
	11th to 20th	Day	17% 27% 34% 18% 3 1	330
	21st to end	Day	11% 22% 40% 23% 5%	330
December	1st to 10th	Day	18% 21% 32% 20% 8% 2	330
	11th to 20th	Day	21% 31% 30% 15% 3	262
	21st to end	Day	20% 22% 35% 16% 7%	242
January	1st to 10th	Night	10% 22% 36% 26% 5%	1050
	11th to 20th	Night	9% 19% 41% 22% 9% 1	853
	21st to end	Night	7% 15% 43% 25% 9% 1	924
February	1st to 10th	Night	10% 22% 41% 23% 5%	840
	11th to 20th	Night	8% 21% 36% 28% 7%	824
	21st to end	Night	11% 21% 37% 25% 6%	692
March	1st to 10th	Night	10% 20% 35% 27% 6% 1	840
	11th to 20th	Night	14% 15% 30% 31% 10% 1	840
	21st to end	Night	11% 17% 33% 31% 8% 1	924
April	1st to 10th	Night	12% 19% 31% 29% 9% 1	740
	11th to 20th	Night	12% 16% 35% 29% 7%	623
	21st to end	Night	15% 14% 28% 30% 12% 1	630
May	1st to 10th	Night	14% 12% 24% 36% 13% 1	630
	11th to 20th	Night	16% 9% 24% 33% 18% 1	621
	21st to end	Night	16% 12% 24% 33% 14% 1	683
June	1st to 10th	Night	13% 8% 21% 39% 18% 1	431
	11th to 20th	Night	14% 10% 29% 36% 11%	420
	21st to end	Night	5% 5% 21% 48% 20% 1	420
July	1st to 10th	Night	3 3 14% 51% 26% 3	410
	11th to 20th	Night	2 2 19% 56% 20%	408
	21st to end	Night	4 3 22% 47% 22% 2	663
August	1st to 10th	Night	6% 5% 20% 45% 23% 1	627
	11th to 20th	Night	5% 4 16% 48% 26% 2	624
	21st to end	Night	7% 6% 23% 40% 23% 1	693
September	1st to 10th	Night	7% 4 24% 40% 23% 2	661
	11th to 20th	Night	9% 5% 21% 37% 25% 3	840
	21st to end	Night	12% 6% 24% 34% 20% 3	832
October	1st to 10th	Night	12% 6% 32% 34% 15% 1	800
	11th to 20th	Night	15% 11% 26% 32% 14% 2	800
	21st to end	Night	12% 15% 32% 30% 9% 3	880
November	1st to 10th	Night	15% 16% 32% 29% 7% 1	849
	11th to 20th	Night	13% 24% 34% 25% 4	1050
	21st to end	Night	9% 19% 36% 28% 7% 1	1050
December	1st to 10th	Night	13% 19% 36% 27% 6%	1050
	11th to 20th	Night	12% 22% 38% 23% 5% 1	1050
	21st to end	Night	13% 22% 36% 23% 5%	1155

Page generated at 2026-09-26 02:18:38. Version ac07

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