Whiteside Mountain
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Whiteside Mountain clear sky chart from 2005-11-06 to 2024-10-25.

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	15% 6% 2 6% 5% 5% 5% 4 6% 7% 38%	100957
	Night	16% 7% 2 6% 4 4 4 4 6% 7% 40%	97806
Transparency	Day	42% 8% 12% 18% 15% 5%	100770
	Night	40% 7% 13% 18% 16% 5%	97663
Seeing	Day	21% 12% 24% 22% 14% 7%	14954
	Night	20% 10% 20% 27% 19% 4	24984

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 4 3 3 3 3 7% 7% 46%	2836
	11th to 20th	Day	16% 7% 3 6% 4 3 3 2 4 4 50%	2840
	21st to end	Day	25% 5% 1 4 3 2 3 4 4 4 44%	3124
February	1st to 10th	Day	18% 8% 3 6% 4 3 3 3 5% 5% 42%	1852
	11th to 20th	Day	20% 7% 2 6% 4 3 3 3 4 6% 40%	1848
	21st to end	Day	22% 8% 2 5% 5% 4 3 3 4 6% 39%	1570
March	1st to 10th	Day	25% 6% 2 5% 3 3 3 3 5% 6% 39%	3309
	11th to 20th	Day	14% 6% 2 4 4 3 3 2 4 5% 51%	3480
	21st to end	Day	19% 8% 2 6% 4 4 4 3 4 5% 40%	3815
April	1st to 10th	Day	13% 6% 2 6% 4 4 4 5% 7% 7% 41%	2090
	11th to 20th	Day	17% 6% 2 6% 5% 4 5% 4 6% 6% 40%	2273
	21st to end	Day	15% 5% 1 5% 4 4 5% 4 5% 6% 46%	2470
May	1st to 10th	Day	15% 8% 3 7% 5% 5% 5% 4 6% 7% 34%	4082
	11th to 20th	Day	20% 8% 3 8% 5% 5% 5% 4 6% 7% 30%	4081
	21st to end	Day	10% 5% 2 6% 5% 5% 5% 5% 8% 9% 38%	4476
June	1st to 10th	Day	13% 7% 3 8% 6% 6% 6% 5% 7% 9% 29%	2470
	11th to 20th	Day	8% 6% 2 7% 6% 5% 7% 6% 9% 10% 33%	2470
	21st to end	Day	9% 6% 2 7% 7% 6% 8% 5% 7% 9% 33%	2470
July	1st to 10th	Day	9% 6% 3 9% 7% 8% 6% 6% 9% 9% 28%	4120
	11th to 20th	Day	11% 6% 3 8% 7% 8% 7% 6% 7% 9% 26%	4120
	21st to end	Day	16% 10% 4 13% 8% 7% 8% 5% 7% 6% 16%	4466
August	1st to 10th	Day	12% 7% 3 8% 6% 7% 7% 6% 9% 10% 25%	4104
	11th to 20th	Day	11% 5% 2 8% 5% 6% 7% 6% 8% 10% 32%	4044
	21st to end	Day	9% 6% 2 7% 4 5% 6% 5% 7% 8% 41%	4108
September	1st to 10th	Day	14% 8% 3 6% 6% 6% 5% 6% 7% 7% 33%	2090
	11th to 20th	Day	18% 7% 3 8% 5% 4 6% 4 6% 8% 31%	2090
	21st to end	Day	18% 6% 2 7% 6% 5% 5% 4 4 6% 37%	2090
October	1st to 10th	Day	15% 7% 2 4 3 3 3 3 4 7% 49%	2090
	11th to 20th	Day	13% 5% 1 4 3 3 4 3 4 6% 54%	1905
	21st to end	Day	15% 4 1 4 3 3 4 3 4 4 55%	2027
November	1st to 10th	Day	13% 6% 2 4 3 2 2 3 4 5% 56%	1740
	11th to 20th	Day	16% 5% 2 4 3 2 3 3 5% 5% 52%	1710
	21st to end	Day	18% 4 2 5% 3 3 3 4 5% 7% 46%	1710
December	1st to 10th	Day	23% 7% 3 6% 4 4 4 4 4 6% 36%	1710
	11th to 20th	Day	18% 6% 2 5% 3 3 3 3 5% 5% 47%	2153
	21st to end	Day	23% 5% 1 4 3 4 4 4 5% 6% 42%	3124
January	1st to 10th	Night	18% 6% 2 5% 4 3 4 3 5% 5% 46%	4109
	11th to 20th	Night	14% 7% 3 6% 4 4 3 3 4 6% 46%	4120
	21st to end	Night	25% 6% 2 5% 3 3 3 4 4 4 40%	4532
February	1st to 10th	Night	16% 6% 2 6% 4 3 3 3 5% 7% 44%	2325
	11th to 20th	Night	20% 8% 2 5% 4 4 4 3 5% 4 42%	2218
	21st to end	Night	21% 7% 2 7% 4 4 4 3 5% 6% 37%	1884
March	1st to 10th	Night	24% 11% 2 5% 4 3 4 5% 5% 5% 31%	3542
	11th to 20th	Night	11% 5% 2 5% 4 3 4 4 6% 9% 48%	3480
	21st to end	Night	20% 6% 2 6% 5% 4 4 3 4 6% 41%	3817
April	1st to 10th	Night	14% 7% 2 6% 3 3 4 4 5% 6% 47%	2090
	11th to 20th	Night	15% 7% 2 4 3 3 3 3 5% 7% 48%	1869
	21st to end	Night	13% 6% 1 5% 4 3 4 3 4 7% 48%	1710
May	1st to 10th	Night	14% 9% 2 7% 5% 4 5% 5% 7% 8% 35%	2813
	11th to 20th	Night	21% 8% 2 5% 4 3 5% 4 6% 8% 34%	2812
	21st to end	Night	10% 5% 2 6% 4 4 5% 5% 8% 10% 40%	3079
June	1st to 10th	Night	13% 6% 3 6% 6% 6% 5% 5% 8% 10% 32%	1710
	11th to 20th	Night	9% 6% 2 6% 5% 4 6% 4 7% 10% 41%	1710
	21st to end	Night	9% 4 2 6% 4 5% 5% 5% 9% 10% 40%	1710
July	1st to 10th	Night	12% 8% 3 9% 6% 6% 6% 5% 8% 10% 29%	2840
	11th to 20th	Night	10% 6% 2 7% 6% 5% 6% 6% 9% 11% 33%	2840
	21st to end	Night	17% 10% 3 10% 7% 6% 5% 5% 7% 8% 22%	3087
August	1st to 10th	Night	12% 7% 2 8% 5% 6% 5% 6% 7% 10% 30%	2825
	11th to 20th	Night	15% 9% 3 8% 5% 5% 5% 4 6% 7% 33%	2785
	21st to end	Night	8% 5% 2 5% 4 4 5% 4 7% 9% 45%	3512
September	1st to 10th	Night	13% 6% 2 7% 5% 4 6% 5% 6% 8% 37%	2090
	11th to 20th	Night	19% 9% 3 7% 4 4 5% 4 5% 6% 34%	2090
	21st to end	Night	18% 7% 2 6% 4 4 3 3 4 7% 43%	2090
October	1st to 10th	Night	16% 5% 2 5% 3 3 3 3 4 6% 51%	2090
	11th to 20th	Night	14% 6% 2 5% 3 3 3 3 4 5% 51%	2274
	21st to end	Night	15% 4 1 3 3 3 4 3 4 4 56%	2435
November	1st to 10th	Night	14% 6% 2 4 3 3 3 2 4 7% 52%	2334
	11th to 20th	Night	16% 6% 2 4 3 3 5% 3 4 5% 50%	2470
	21st to end	Night	16% 5% 2 6% 4 4 4 4 5% 6% 44%	2470
December	1st to 10th	Night	21% 8% 3 6% 4 3 4 3 4 5% 38%	2470
	11th to 20th	Night	16% 7% 2 5% 3 3 3 3 5% 6% 48%	3042
	21st to end	Night	22% 7% 2 6% 4 4 4 4 5% 7% 34%	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	35% 3 9% 21% 22% 10%	2837
	11th to 20th	Day	38% 4 6% 15% 25% 11%	2840
	21st to end	Day	42% 2 6% 21% 20% 9%	3124
February	1st to 10th	Day	43% 5% 8% 19% 19% 6%	1852
	11th to 20th	Day	45% 4 8% 17% 19% 7%	1858
	21st to end	Day	47% 5% 8% 15% 17% 9%	1570
March	1st to 10th	Day	45% 5% 8% 17% 16% 10%	3309
	11th to 20th	Day	35% 6% 7% 14% 26% 12%	3480
	21st to end	Day	45% 4 9% 20% 17% 4	3815
April	1st to 10th	Day	38% 6% 12% 19% 20% 6%	2090
	11th to 20th	Day	41% 5% 9% 17% 20% 7%	2273
	21st to end	Day	37% 6% 12% 25% 17% 3	2470
May	1st to 10th	Day	44% 10% 13% 19% 12% 3	4120
	11th to 20th	Day	50% 9% 12% 18% 11% 1	4085
	21st to end	Day	36% 11% 15% 19% 17% 1	4489
June	1st to 10th	Day	48% 11% 15% 18% 6% 2	2470
	11th to 20th	Day	41% 13% 17% 18% 9% 1	2470
	21st to end	Day	43% 11% 16% 17% 11% 2	2470
July	1st to 10th	Day	44% 15% 18% 18% 4	4055
	11th to 20th	Day	48% 14% 22% 12% 3 1	4051
	21st to end	Day	63% 13% 11% 9% 4	4324
August	1st to 10th	Day	45% 14% 18% 20% 4	4091
	11th to 20th	Day	38% 16% 21% 12% 10% 3	4083
	21st to end	Day	36% 11% 16% 28% 9% 1	4108
September	1st to 10th	Day	45% 10% 11% 17% 14% 3	2090
	11th to 20th	Day	49% 8% 11% 17% 14% 2	2090
	21st to end	Day	45% 7% 11% 16% 15% 5%	2090
October	1st to 10th	Day	36% 5% 10% 17% 26% 7%	2090
	11th to 20th	Day	30% 5% 10% 21% 21% 13%	1905
	21st to end	Day	32% 4 7% 21% 24% 12%	2027
November	1st to 10th	Day	31% 4 8% 18% 29% 11%	1740
	11th to 20th	Day	33% 3 6% 22% 26% 9%	1710
	21st to end	Day	37% 4 7% 20% 26% 7%	1710
December	1st to 10th	Day	48% 5% 7% 18% 16% 7%	1710
	11th to 20th	Day	37% 3 9% 16% 23% 12%	2150
	21st to end	Day	39% 4 9% 23% 21% 5%	3124
January	1st to 10th	Night	38% 3 9% 16% 24% 10%	4109
	11th to 20th	Night	38% 4 9% 11% 27% 11%	4120
	21st to end	Night	45% 2 8% 15% 20% 9%	4532
February	1st to 10th	Night	38% 4 12% 20% 20% 6%	2325
	11th to 20th	Night	45% 4 8% 18% 19% 6%	2219
	21st to end	Night	46% 4 9% 18% 16% 7%	1884
March	1st to 10th	Night	49% 6% 10% 16% 13% 6%	3542
	11th to 20th	Night	31% 6% 10% 19% 22% 13%	3480
	21st to end	Night	44% 5% 9% 18% 15% 8%	3817
April	1st to 10th	Night	36% 4 12% 21% 23% 4	2090
	11th to 20th	Night	35% 4 10% 22% 21% 7%	1869
	21st to end	Night	34% 7% 14% 25% 18% 2	1710
May	1st to 10th	Night	42% 10% 14% 21% 12% 1	2840
	11th to 20th	Night	44% 10% 16% 18% 11%	2813
	21st to end	Night	31% 12% 18% 27% 11% 1	3087
June	1st to 10th	Night	41% 14% 17% 20% 8% 1	1710
	11th to 20th	Night	34% 11% 23% 22% 9% 1	1710
	21st to end	Night	32% 14% 20% 19% 12% 3	1710
July	1st to 10th	Night	44% 15% 21% 15% 5%	2795
	11th to 20th	Night	38% 18% 26% 15% 3 1	2786
	21st to end	Night	54% 15% 17% 11% 3 1	2988
August	1st to 10th	Night	42% 15% 23% 16% 4	2814
	11th to 20th	Night	44% 14% 18% 13% 9% 2	2812
	21st to end	Night	31% 12% 19% 29% 9% 1	3512
September	1st to 10th	Night	41% 11% 15% 18% 12% 3	2090
	11th to 20th	Night	47% 9% 12% 16% 14% 1	2090
	21st to end	Night	41% 6% 11% 21% 16% 5%	2090
October	1st to 10th	Night	34% 6% 11% 18% 26% 5%	2090
	11th to 20th	Night	35% 5% 10% 21% 20% 11%	2274
	21st to end	Night	31% 3 6% 21% 27% 11%	2435
November	1st to 10th	Night	33% 4 9% 19% 23% 11%	2334
	11th to 20th	Night	35% 4 7% 17% 25% 12%	2470
	21st to end	Night	39% 4 6% 21% 23% 7%	2470
December	1st to 10th	Night	47% 4 9% 17% 17% 7%	2470
	11th to 20th	Night	36% 4 9% 19% 24% 8%	3044
	21st to end	Night	46% 4 10% 19% 17% 4	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	32% 21% 33% 10% 3	270
	11th to 20th	Day	36% 21% 28% 13% 2	270
	21st to end	Day	32% 27% 29% 9% 2	297
February	1st to 10th	Day	28% 24% 38% 9% 1	270
	11th to 20th	Day	44% 23% 27% 5%	270
	21st to end	Day	42% 26% 26% 4 2	225
March	1st to 10th	Day	32% 15% 30% 16% 6%	381
	11th to 20th	Day	30% 21% 29% 15% 4 1	460
	21st to end	Day	28% 22% 28% 16% 5% 1	506
April	1st to 10th	Day	27% 15% 29% 20% 8% 1	460
	11th to 20th	Day	20% 21% 27% 21% 10% 2	452
	21st to end	Day	22% 15% 26% 21% 12% 4	460
May	1st to 10th	Day	18% 21% 26% 20% 9% 5%	463
	11th to 20th	Day	22% 10% 23% 25% 13% 7%	487
	21st to end	Day	19% 9% 19% 27% 14% 12%	529
June	1st to 10th	Day	16% 7% 20% 28% 17% 11%	490
	11th to 20th	Day	11% 6% 21% 23% 23% 15%	490
	21st to end	Day	11% 7% 26% 29% 15% 13%	490
July	1st to 10th	Day	9% 4 13% 30% 26% 17%	485
	11th to 20th	Day	10% 3 15% 27% 25% 20%	484
	21st to end	Day	10% 3 14% 29% 25% 19%	532
August	1st to 10th	Day	17% 5% 21% 23% 19% 16%	486
	11th to 20th	Day	11% 5% 15% 29% 25% 15%	479
	21st to end	Day	16% 3 13% 25% 29% 14%	539
September	1st to 10th	Day	12% 5% 18% 26% 29% 10%	490
	11th to 20th	Day	18% 6% 16% 24% 26% 10%	490
	21st to end	Day	21% 6% 17% 28% 22% 5%	490
October	1st to 10th	Day	19% 7% 21% 27% 18% 8%	490
	11th to 20th	Day	15% 12% 26% 28% 14% 4	490
	21st to end	Day	21% 11% 25% 30% 11% 3	514
November	1st to 10th	Day	19% 11% 30% 25% 12% 2	338
	11th to 20th	Day	22% 20% 33% 21% 4	270
	21st to end	Day	18% 17% 37% 20% 6% 1	270
December	1st to 10th	Day	34% 20% 30% 13% 3 1	270
	11th to 20th	Day	27% 16% 33% 20% 4	270
	21st to end	Day	33% 18% 33% 11% 4 1	297
January	1st to 10th	Night	28% 15% 29% 23% 6%	760
	11th to 20th	Night	23% 19% 27% 25% 6%	760
	21st to end	Night	24% 16% 35% 22% 3	836
February	1st to 10th	Night	21% 14% 27% 33% 4	760
	11th to 20th	Night	27% 17% 32% 21% 2	743
	21st to end	Night	29% 19% 28% 20% 4	628
March	1st to 10th	Night	24% 15% 29% 28% 5%	760
	11th to 20th	Night	24% 14% 30% 23% 8% 1	760
	21st to end	Night	23% 14% 30% 24% 8%	836
April	1st to 10th	Night	21% 17% 27% 25% 9% 1	760
	11th to 20th	Night	23% 10% 25% 26% 13% 2	612
	21st to end	Night	15% 11% 21% 33% 18% 2	570
May	1st to 10th	Night	16% 12% 21% 29% 21% 1	570
	11th to 20th	Night	20% 7% 18% 29% 23% 4	561
	21st to end	Night	16% 3 13% 28% 30% 9%	617
June	1st to 10th	Night	14% 3 14% 31% 31% 7%	570
	11th to 20th	Night	9% 3 15% 28% 32% 13%	570
	21st to end	Night	8% 2 14% 28% 40% 7%	570
July	1st to 10th	Night	11% 3 8% 23% 45% 9%	555
	11th to 20th	Night	12% 1 10% 22% 41% 13%	552
	21st to end	Night	9% 3 9% 26% 42% 12%	624
August	1st to 10th	Night	17% 3 10% 24% 35% 11%	567
	11th to 20th	Night	16% 5% 11% 25% 34% 10%	564
	21st to end	Night	13% 3 9% 26% 38% 11%	651
September	1st to 10th	Night	13% 3 12% 28% 34% 10%	760
	11th to 20th	Night	22% 3 12% 25% 32% 5%	760
	21st to end	Night	21% 5% 10% 34% 26% 4	760
October	1st to 10th	Night	17% 7% 17% 25% 26% 8%	760
	11th to 20th	Night	19% 11% 17% 31% 19% 3	760
	21st to end	Night	19% 9% 18% 35% 16% 3	812
November	1st to 10th	Night	18% 8% 20% 31% 20% 3	740
	11th to 20th	Night	20% 13% 21% 32% 12% 3	760
	21st to end	Night	19% 13% 21% 33% 14% 1	760
December	1st to 10th	Night	27% 14% 22% 29% 7% 1	760
	11th to 20th	Night	21% 13% 25% 32% 9% 1	760
	21st to end	Night	30% 13% 24% 29% 5%	836

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