Worth Mountain WMA
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Worth Mountain WMA clear sky chart from 2005-11-06 to 2024-11-05.

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	14% 6% 2 6% 4 4 5% 4 6% 8% 43%	101186
	Night	15% 6% 2 6% 4 4 4 4 5% 7% 43%	97814
Transparency	Day	37% 7% 12% 20% 18% 5%	104902
	Night	38% 7% 11% 18% 20% 6%	102237
Seeing	Day	17% 9% 23% 24% 19% 8%	15230
	Night	16% 8% 23% 30% 19% 3	25284

By Month

Percentage Cloud Cover SE (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	17% 5% 2 5% 3 3 3 3 4 6% 50%	2836
	11th to 20th	Day	15% 7% 2 5% 3 3 3 3 4 4 52%	2840
	21st to end	Day	25% 7% 2 5% 3 3 3 3 4 5% 43%	3124
February	1st to 10th	Day	16% 7% 2 6% 4 4 4 4 5% 7% 42%	1729
	11th to 20th	Day	22% 6% 2 4 3 3 4 3 4 4 46%	1848
	21st to end	Day	20% 7% 2 6% 5% 3 4 4 3 5% 41%	1590
March	1st to 10th	Day	23% 7% 2 5% 3 3 3 3 4 5% 41%	3435
	11th to 20th	Day	12% 4 2 4 3 4 4 3 5% 6% 53%	3480
	21st to end	Day	21% 6% 2 5% 3 3 4 3 5% 6% 42%	3815
April	1st to 10th	Day	11% 5% 2 4 3 3 4 4 5% 8% 50%	2090
	11th to 20th	Day	13% 5% 2 5% 4 4 4 4 6% 6% 47%	2216
	21st to end	Day	12% 5% 2 6% 4 3 4 4 5% 6% 50%	2465
May	1st to 10th	Day	11% 6% 3 7% 5% 5% 5% 5% 8% 10% 36%	4082
	11th to 20th	Day	16% 8% 3 8% 4 4 5% 3 5% 7% 38%	4081
	21st to end	Day	7% 4 2 5% 4 4 5% 5% 8% 10% 46%	4476
June	1st to 10th	Day	10% 6% 2 7% 5% 5% 6% 5% 7% 10% 37%	2470
	11th to 20th	Day	7% 5% 2 5% 6% 4 6% 5% 8% 9% 44%	2470
	21st to end	Day	8% 4 2 7% 5% 5% 6% 5% 8% 11% 40%	2470
July	1st to 10th	Day	9% 6% 3 6% 5% 6% 8% 5% 8% 10% 34%	4120
	11th to 20th	Day	6% 5% 2 7% 5% 6% 7% 5% 9% 12% 36%	4120
	21st to end	Day	11% 8% 3 9% 6% 7% 7% 5% 9% 10% 25%	4466
August	1st to 10th	Day	20% 7% 2 7% 5% 5% 6% 5% 8% 10% 26%	4104
	11th to 20th	Day	10% 5% 2 7% 5% 5% 6% 6% 8% 11% 35%	4044
	21st to end	Day	6% 4 1 5% 4 4 4 4 6% 10% 52%	4228
September	1st to 10th	Day	8% 5% 2 6% 5% 5% 5% 5% 7% 9% 42%	2090
	11th to 20th	Day	13% 7% 3 6% 4 4 5% 4 6% 8% 40%	2090
	21st to end	Day	17% 6% 3 6% 5% 4 5% 4 4 5% 42%	2090
October	1st to 10th	Day	15% 4 2 4 2 2 3 2 4 5% 56%	2004
	11th to 20th	Day	13% 5% 1 4 3 3 2 2 4 4 60%	1900
	21st to end	Day	14% 5% 2 3 3 3 2 2 3 5% 57%	2090
November	1st to 10th	Day	14% 5% 2 4 3 2 3 3 4 5% 55%	1898
	11th to 20th	Day	14% 5% 1 4 3 4 4 2 5% 6% 53%	1728
	21st to end	Day	17% 5% 2 4 4 4 3 3 4 6% 49%	1710
December	1st to 10th	Day	19% 8% 3 6% 3 4 4 3 5% 7% 39%	1710
	11th to 20th	Day	17% 5% 2 5% 2 2 3 3 5% 5% 50%	2153
	21st to end	Day	20% 6% 2 5% 3 3 4 3 5% 6% 43%	3124
January	1st to 10th	Night	18% 5% 2 5% 4 3 3 2 4 5% 50%	4109
	11th to 20th	Night	13% 6% 2 5% 4 4 4 3 5% 5% 49%	4120
	21st to end	Night	24% 8% 2 5% 3 3 2 2 3 4 45%	4532
February	1st to 10th	Night	15% 6% 2 6% 5% 3 4 3 4 5% 48%	2447
	11th to 20th	Night	20% 7% 2 5% 4 4 3 3 4 4 44%	2218
	21st to end	Night	16% 7% 2 7% 4 4 4 3 5% 6% 42%	1862
March	1st to 10th	Night	23% 8% 3 6% 4 4 4 3 4 5% 36%	3418
	11th to 20th	Night	11% 5% 2 5% 3 3 4 3 6% 8% 51%	3480
	21st to end	Night	19% 6% 2 5% 4 3 4 3 4 6% 43%	3817
April	1st to 10th	Night	13% 5% 2 5% 4 3 4 3 4 8% 49%	2090
	11th to 20th	Night	13% 5% 2 4 4 3 3 3 5% 7% 50%	1913
	21st to end	Night	12% 5% 2 6% 4 3 4 3 5% 6% 50%	1729
May	1st to 10th	Night	13% 7% 3 6% 4 5% 4 3 6% 9% 40%	2813
	11th to 20th	Night	17% 7% 3 7% 5% 4 4 4 5% 7% 38%	2812
	21st to end	Night	7% 4 2 6% 4 4 6% 5% 9% 11% 41%	3079
June	1st to 10th	Night	10% 5% 2 7% 6% 5% 6% 6% 7% 11% 34%	1710
	11th to 20th	Night	10% 5% 2 6% 6% 6% 5% 6% 7% 11% 37%	1710
	21st to end	Night	8% 5% 2 7% 7% 5% 7% 5% 8% 11% 35%	1710
July	1st to 10th	Night	10% 8% 3 9% 6% 6% 6% 5% 7% 11% 28%	2840
	11th to 20th	Night	9% 5% 2 6% 5% 5% 6% 6% 10% 14% 32%	2840
	21st to end	Night	14% 9% 5% 10% 7% 6% 7% 5% 7% 9% 21%	3087
August	1st to 10th	Night	20% 9% 3 8% 5% 5% 5% 4 7% 9% 24%	2825
	11th to 20th	Night	12% 6% 2 8% 6% 6% 6% 5% 8% 9% 30%	2785
	21st to end	Night	6% 4 2 6% 4 5% 5% 5% 7% 9% 47%	3391
September	1st to 10th	Night	11% 5% 2 7% 4 3 5% 4 6% 9% 43%	2090
	11th to 20th	Night	14% 7% 2 7% 4 5% 6% 5% 5% 8% 36%	2090
	21st to end	Night	17% 6% 2 6% 4 4 4 4 5% 7% 41%	2090
October	1st to 10th	Night	15% 4 2 5% 4 3 3 2 4 6% 52%	2175
	11th to 20th	Night	14% 5% 1 5% 3 3 3 2 5% 6% 54%	2280
	21st to end	Night	13% 4 2 5% 2 2 3 2 3 4 58%	2508
November	1st to 10th	Night	14% 5% 1 4 3 3 3 2 4 5% 55%	2280
	11th to 20th	Night	14% 6% 1 4 3 3 3 3 4 6% 52%	2450
	21st to end	Night	15% 4 2 4 3 4 5% 4 5% 6% 49%	2470
December	1st to 10th	Night	19% 8% 2 6% 3 4 4 3 4 5% 42%	2470
	11th to 20th	Night	17% 6% 2 5% 2 2 2 3 3 5% 52%	3042
	21st to end	Night	21% 5% 1 5% 4 4 4 3 5% 7% 41%	4532

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	36% 3 5% 25% 23% 7%	2837
	11th to 20th	Day	36% 4 5% 16% 32% 6%	2840
	21st to end	Day	45% 4 5% 16% 25% 6%	3124
February	1st to 10th	Day	40% 5% 9% 21% 19% 5%	1729
	11th to 20th	Day	42% 5% 7% 17% 23% 6%	1858
	21st to end	Day	46% 5% 7% 15% 20% 7%	1590
March	1st to 10th	Day	46% 5% 7% 17% 16% 10%	3435
	11th to 20th	Day	32% 6% 8% 15% 28% 11%	3480
	21st to end	Day	43% 5% 7% 19% 23% 3	3815
April	1st to 10th	Day	32% 6% 10% 20% 26% 6%	2090
	11th to 20th	Day	36% 6% 8% 19% 21% 10%	2216
	21st to end	Day	35% 6% 12% 24% 20% 4	2465
May	1st to 10th	Day	40% 10% 16% 19% 13% 2	4120
	11th to 20th	Day	45% 8% 10% 22% 14% 1	4085
	21st to end	Day	29% 10% 17% 22% 19% 3	4489
June	1st to 10th	Day	38% 9% 15% 26% 10% 1	2470
	11th to 20th	Day	33% 10% 18% 23% 15% 1	2470
	21st to end	Day	34% 11% 16% 21% 14% 2	2470
July	1st to 10th	Day	38% 12% 20% 18% 10% 2	4055
	11th to 20th	Day	36% 13% 26% 18% 5% 1	4051
	21st to end	Day	50% 13% 15% 16% 6%	4324
August	1st to 10th	Day	49% 10% 17% 18% 5%	4091
	11th to 20th	Day	39% 12% 18% 18% 12% 2	4083
	21st to end	Day	26% 8% 16% 30% 16% 3	4228
September	1st to 10th	Day	36% 9% 13% 19% 18% 4	2090
	11th to 20th	Day	40% 8% 13% 16% 20% 3	2090
	21st to end	Day	45% 6% 9% 18% 16% 6%	2090
October	1st to 10th	Day	28% 4 7% 20% 31% 10%	3329
	11th to 20th	Day	19% 3 6% 18% 29% 25%	3140
	21st to end	Day	26% 3 5% 25% 25% 16%	3428
November	1st to 10th	Day	33% 4 7% 18% 29% 9%	1898
	11th to 20th	Day	33% 4 8% 21% 26% 9%	1728
	21st to end	Day	38% 4 8% 21% 23% 7%	1710
December	1st to 10th	Day	45% 5% 8% 20% 17% 5%	1710
	11th to 20th	Day	35% 4 8% 20% 22% 11%	2150
	21st to end	Day	41% 5% 8% 22% 21% 3	3124
January	1st to 10th	Night	37% 4 7% 18% 27% 7%	4109
	11th to 20th	Night	36% 5% 8% 16% 29% 7%	4120
	21st to end	Night	45% 3 4 16% 26% 6%	4532
February	1st to 10th	Night	39% 5% 9% 19% 22% 6%	2447
	11th to 20th	Night	44% 4 7% 16% 22% 7%	2219
	21st to end	Night	42% 5% 9% 16% 21% 7%	1862
March	1st to 10th	Night	48% 7% 10% 14% 15% 7%	3418
	11th to 20th	Night	31% 5% 8% 16% 25% 14%	3480
	21st to end	Night	42% 5% 7% 18% 20% 8%	3817
April	1st to 10th	Night	34% 6% 9% 19% 26% 7%	2090
	11th to 20th	Night	32% 5% 9% 21% 23% 9%	1913
	21st to end	Night	34% 5% 11% 25% 21% 4	1729
May	1st to 10th	Night	39% 8% 14% 22% 15% 2	2840
	11th to 20th	Night	43% 9% 12% 20% 15% 1	2813
	21st to end	Night	30% 10% 16% 27% 16% 1	3087
June	1st to 10th	Night	40% 11% 16% 19% 11% 2	1710
	11th to 20th	Night	38% 11% 16% 22% 11% 2	1710
	21st to end	Night	40% 12% 16% 16% 12% 4	1710
July	1st to 10th	Night	47% 12% 17% 13% 9% 2	2795
	11th to 20th	Night	37% 14% 26% 18% 4 1	2786
	21st to end	Night	56% 13% 14% 13% 4 1	2988
August	1st to 10th	Night	54% 10% 18% 14% 4	2814
	11th to 20th	Night	44% 13% 20% 14% 8%	2812
	21st to end	Night	29% 10% 15% 25% 20% 2	3391
September	1st to 10th	Night	36% 10% 14% 18% 17% 5%	2090
	11th to 20th	Night	43% 8% 13% 14% 18% 2	2090
	21st to end	Night	41% 7% 12% 16% 18% 5%	2090
October	1st to 10th	Night	33% 6% 9% 19% 27% 7%	3630
	11th to 20th	Night	23% 3 5% 19% 26% 24%	3779
	21st to end	Night	28% 3 5% 20% 27% 17%	4120
November	1st to 10th	Night	33% 5% 7% 17% 27% 11%	2280
	11th to 20th	Night	34% 5% 6% 17% 26% 12%	2450
	21st to end	Night	35% 5% 6% 20% 27% 7%	2470
December	1st to 10th	Night	44% 6% 8% 17% 20% 6%	2470
	11th to 20th	Night	36% 4 8% 17% 24% 10%	3044
	21st to end	Night	41% 5% 9% 21% 21% 3	4532

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	23% 18% 40% 17% 2	270
	11th to 20th	Day	29% 18% 30% 18% 4	270
	21st to end	Day	24% 21% 37% 14% 4	297
February	1st to 10th	Day	21% 23% 34% 15% 6%	270
	11th to 20th	Day	37% 17% 34% 11% 1	270
	21st to end	Day	27% 23% 35% 13% 2	245
March	1st to 10th	Day	23% 15% 32% 23% 7% 1	460
	11th to 20th	Day	21% 15% 38% 19% 5% 1	460
	21st to end	Day	21% 19% 35% 19% 6% 1	506
April	1st to 10th	Day	20% 17% 32% 21% 10% 1	460
	11th to 20th	Day	15% 15% 31% 22% 14% 2	452
	21st to end	Day	16% 11% 27% 25% 15% 5%	460
May	1st to 10th	Day	11% 14% 32% 25% 13% 5%	463
	11th to 20th	Day	17% 6% 22% 25% 21% 9%	487
	21st to end	Day	15% 4 17% 24% 26% 13%	529
June	1st to 10th	Day	12% 3 16% 33% 24% 11%	490
	11th to 20th	Day	8% 5% 16% 29% 28% 14%	490
	21st to end	Day	9% 3 16% 32% 27% 13%	490
July	1st to 10th	Day	10% 2 9% 25% 32% 22%	485
	11th to 20th	Day	8% 1 10% 29% 35% 17%	484
	21st to end	Day	8% 1 11% 35% 29% 15%	532
August	1st to 10th	Day	18% 4 12% 24% 27% 15%	486
	11th to 20th	Day	13% 4 10% 28% 29% 16%	479
	21st to end	Day	11% 3 11% 27% 29% 19%	539
September	1st to 10th	Day	13% 1 13% 28% 29% 16%	490
	11th to 20th	Day	18% 4 16% 22% 26% 14%	490
	21st to end	Day	21% 4 20% 26% 25% 6%	490
October	1st to 10th	Day	17% 4 23% 26% 21% 9%	490
	11th to 20th	Day	13% 8% 21% 30% 22% 6%	490
	21st to end	Day	18% 8% 19% 29% 22% 5%	539
November	1st to 10th	Day	21% 8% 24% 27% 17% 3	472
	11th to 20th	Day	18% 13% 38% 23% 6% 2	288
	21st to end	Day	13% 13% 30% 31% 11% 2	270
December	1st to 10th	Day	25% 14% 37% 17% 7%	270
	11th to 20th	Day	25% 11% 33% 21% 8% 1	270
	21st to end	Day	29% 16% 32% 15% 7% 2	297
January	1st to 10th	Night	21% 17% 30% 27% 6%	760
	11th to 20th	Night	20% 15% 29% 30% 5%	760
	21st to end	Night	20% 13% 36% 28% 3	836
February	1st to 10th	Night	19% 13% 35% 30% 4	760
	11th to 20th	Night	26% 13% 39% 20% 2	743
	21st to end	Night	21% 14% 38% 23% 3	628
March	1st to 10th	Night	20% 11% 32% 32% 5%	760
	11th to 20th	Night	18% 13% 34% 25% 8% 1	760
	21st to end	Night	20% 13% 33% 28% 7%	836
April	1st to 10th	Night	17% 15% 33% 27% 9%	760
	11th to 20th	Night	16% 12% 27% 31% 13% 1	751
	21st to end	Night	13% 6% 28% 36% 17% 1	589
May	1st to 10th	Night	10% 9% 28% 37% 16%	570
	11th to 20th	Night	14% 3 24% 35% 22% 2	561
	21st to end	Night	14% 3 13% 32% 36% 2	617
June	1st to 10th	Night	12% 2 15% 38% 29% 4	570
	11th to 20th	Night	12% 2 14% 30% 33% 9%	570
	21st to end	Night	9% 3 12% 36% 36% 5%	570
July	1st to 10th	Night	10% 3 7% 31% 39% 10%	555
	11th to 20th	Night	10% 2 6% 30% 41% 10%	552
	21st to end	Night	10% 2 10% 30% 42% 7%	624
August	1st to 10th	Night	15% 2 8% 29% 39% 7%	567
	11th to 20th	Night	12% 3 9% 32% 37% 7%	564
	21st to end	Night	12% 2 9% 27% 43% 7%	749
September	1st to 10th	Night	10% 3 11% 30% 39% 7%	760
	11th to 20th	Night	16% 4 15% 26% 35% 5%	760
	21st to end	Night	19% 3 16% 31% 28% 3	760
October	1st to 10th	Night	17% 4 17% 30% 27% 6%	760
	11th to 20th	Night	16% 6% 24% 30% 22% 2	760
	21st to end	Night	15% 8% 22% 34% 19% 3	836
November	1st to 10th	Night	16% 7% 24% 32% 19% 3	760
	11th to 20th	Night	15% 11% 29% 33% 12% 1	760
	21st to end	Night	16% 8% 27% 35% 13% 1	760
December	1st to 10th	Night	23% 11% 26% 33% 6%	760
	11th to 20th	Night	20% 8% 27% 34% 11%	760
	21st to end	Night	26% 12% 25% 29% 9%	836

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