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 2024-11-02.

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	5% 11% 4 10% 6% 5% 5% 4 6% 7% 37%	101495
	Night	3 9% 4 11% 7% 6% 5% 4 6% 7% 37%	97653
Transparency	Day	44% 8% 12% 18% 14% 5%	101237
	Night	43% 9% 13% 19% 12% 4	97501
Seeing	Day	15% 21% 32% 22% 9% 2	15431
	Night	10% 14% 30% 32% 12% 1	24931

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 9% 7% 23% 12% 7% 6% 4 6% 6% 19%	2223
	11th to 20th	Day	1 11% 7% 16% 11% 7% 5% 3 5% 6% 28%	2546
	21st to end	Day	1 20% 11% 17% 7% 4 4 3 3 5% 27%	3146
February	1st to 10th	Day	1 14% 10% 19% 10% 7% 5% 4 5% 6% 19%	1710
	11th to 20th	Day	1 15% 8% 21% 9% 5% 5% 4 4 5% 23%	1665
	21st to end	Day	2 17% 8% 20% 12% 7% 5% 2 4 5% 18%	1513
March	1st to 10th	Day	1 13% 7% 18% 8% 5% 4 3 4 5% 32%	3341
	11th to 20th	Day	2 14% 7% 11% 5% 4 4 3 4 5% 40%	3490
	21st to end	Day	4 22% 9% 19% 8% 8% 5% 4 4 4 11%	3825
April	1st to 10th	Day	4 23% 6% 13% 7% 5% 5% 4 5% 6% 22%	2185
	11th to 20th	Day	5% 17% 6% 13% 7% 5% 4 4 5% 6% 27%	2437
	21st to end	Day	9% 20% 5% 11% 6% 4 4 4 5% 6% 26%	2470
May	1st to 10th	Day	8% 20% 6% 10% 6% 6% 4 4 6% 6% 24%	4110
	11th to 20th	Day	6% 11% 3 9% 6% 6% 7% 5% 7% 8% 32%	4255
	21st to end	Day	11% 17% 4 9% 6% 5% 5% 4 5% 6% 28%	4825
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	10% 13% 3 8% 5% 4 4 3 5% 5% 39%	1948
	11th to 20th	Day	8% 13% 4 9% 5% 4 3 2 4 5% 44%	1900
	21st to end	Day	4 13% 4 11% 5% 5% 4 5% 5% 7% 37%	2000
November	1st to 10th	Day	6% 17% 5% 12% 4 4 4 4 5% 6% 33%	1636
	11th to 20th	Day	3 14% 6% 11% 8% 6% 5% 4 6% 7% 30%	1520
	21st to end	Day	2 11% 5% 12% 7% 6% 6% 4 6% 6% 35%	1520
December	1st to 10th	Day	2 12% 6% 15% 9% 8% 8% 4 6% 7% 25%	1520
	11th to 20th	Day	1 14% 8% 19% 7% 6% 6% 5% 7% 7% 19%	1760
	21st to end	Day	1 12% 7% 17% 9% 5% 5% 3 5% 6% 29%	2442
January	1st to 10th	Night	1 7% 5% 23% 11% 7% 7% 5% 6% 7% 21%	4726
	11th to 20th	Night	1 8% 5% 18% 13% 8% 6% 4 6% 7% 24%	4437
	21st to end	Night	2 18% 10% 18% 7% 6% 5% 4 4 5% 21%	4521
February	1st to 10th	Night	1 12% 5% 18% 12% 8% 6% 5% 6% 6% 22%	2470
	11th to 20th	Night	1 11% 6% 18% 11% 6% 6% 5% 5% 6% 25%	2402
	21st to end	Night	1 12% 6% 17% 10% 9% 7% 5% 5% 6% 21%	1938
March	1st to 10th	Night	1 12% 5% 15% 9% 7% 6% 4 5% 6% 31%	3533
	11th to 20th	Night	2 8% 4 11% 5% 4 4 3 4 7% 47%	3490
	21st to end	Night	2 12% 7% 15% 7% 6% 7% 6% 8% 8% 22%	3828
April	1st to 10th	Night	4 14% 6% 12% 8% 6% 4 4 5% 6% 30%	1994
	11th to 20th	Night	5% 10% 3 10% 7% 5% 5% 4 7% 8% 35%	1691
	21st to end	Night	7% 14% 4 8% 5% 5% 4 4 5% 7% 37%	1710
May	1st to 10th	Night	7% 13% 4 10% 7% 7% 6% 5% 6% 7% 28%	2860
	11th to 20th	Night	5% 12% 3 8% 4 5% 5% 4 6% 8% 41%	2646
	21st to end	Night	9% 15% 3 8% 6% 4 5% 5% 7% 9% 29%	2762
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	7% 9% 3 6% 5% 4 4 3 5% 7% 47%	2232
	11th to 20th	Night	6% 12% 4 6% 4 3 3 2 4 6% 48%	2280
	21st to end	Night	4 9% 4 9% 5% 5% 6% 4 6% 8% 40%	2595
November	1st to 10th	Night	6% 12% 4 10% 7% 5% 6% 4 6% 7% 33%	2443
	11th to 20th	Night	2 12% 4 12% 9% 8% 7% 5% 6% 7% 28%	2660
	21st to end	Night	2 9% 5% 11% 8% 5% 6% 5% 6% 8% 34%	2660
December	1st to 10th	Night	2 11% 6% 17% 11% 8% 7% 4 6% 6% 23%	2660
	11th to 20th	Night	2 10% 7% 17% 10% 6% 6% 5% 6% 7% 24%	3428
	21st to end	Night	1 12% 7% 17% 9% 6% 6% 4 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	51% 10% 14% 13% 11%	3341
	11th to 20th	Day	43% 7% 20% 23% 6%	3490
	21st to end	Day	70% 12% 10% 7% 1	3825
April	1st to 10th	Day	61% 8% 12% 14% 6%	2185
	11th to 20th	Day	54% 8% 14% 18% 5%	2440
	21st to end	Day	56% 7% 14% 18% 5%	2470
May	1st to 10th	Day	51% 11% 12% 20% 5% 1	4110
	11th to 20th	Day	40% 10% 17% 21% 10% 1	4259
	21st to end	Day	52% 9% 14% 19% 6%	4825
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	45% 6% 12% 20% 15% 1	1948
	11th to 20th	Day	43% 4 16% 25% 10% 2	1900
	21st to end	Day	44% 10% 15% 21% 8% 1	2000
November	1st to 10th	Day	52% 9% 13% 19% 7% 1	1636
	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	45% 16% 13% 16% 9% 2	3533
	11th to 20th	Night	34% 8% 24% 27% 7%	3490
	21st to end	Night	50% 15% 19% 14% 3	3828
April	1st to 10th	Night	50% 10% 17% 17% 6% 1	1994
	11th to 20th	Night	42% 7% 20% 23% 6% 1	1691
	21st to end	Night	44% 8% 18% 24% 6%	1710
May	1st to 10th	Night	42% 13% 18% 19% 8%	2860
	11th to 20th	Night	35% 10% 14% 30% 8% 2	2647
	21st to end	Night	46% 12% 15% 22% 6%	2762
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	36% 5% 16% 25% 18% 1	2232
	11th to 20th	Night	37% 5% 16% 29% 12% 2	2280
	21st to end	Night	40% 10% 16% 23% 10% 1	2595
November	1st to 10th	Night	50% 9% 15% 19% 7% 1	2443
	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% 12% 2 1	460
	11th to 20th	Day	17% 25% 32% 20% 6%	460
	21st to end	Day	18% 32% 30% 16% 4	506
April	1st to 10th	Day	23% 32% 30% 13% 3	460
	11th to 20th	Day	20% 31% 31% 15% 3	452
	21st to end	Day	23% 22% 31% 16% 6% 2	460
May	1st to 10th	Day	17% 22% 31% 21% 8% 1	463
	11th to 20th	Day	18% 15% 31% 22% 11% 4	594
	21st to end	Day	22% 15% 25% 22% 14% 2	734
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	19% 25% 30% 19% 5% 1	330
November	1st to 10th	Day	22% 23% 31% 16% 7% 2	273
	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	9% 20% 36% 28% 6% 1	760
	11th to 20th	Night	11% 14% 30% 33% 11% 1	760
	21st to end	Night	11% 16% 31% 33% 8% 1	836
April	1st to 10th	Night	12% 19% 32% 29% 8% 1	670
	11th to 20th	Night	11% 16% 35% 29% 8%	563
	21st to end	Night	15% 13% 28% 29% 13% 1	570
May	1st to 10th	Night	14% 12% 25% 34% 14% 1	570
	11th to 20th	Night	14% 8% 24% 35% 19% 1	561
	21st to end	Night	17% 12% 24% 31% 15% 1	617
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% 31% 30% 7% 1	769
	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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