Rainsburg Mountain
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Rainsburg Mountain clear sky chart from 2005-11-06 to 2024-12-06.

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% 8% 3 7% 5% 5% 5% 4 6% 7% 36%	101458
	Night	15% 8% 3 7% 5% 4 4 4 5% 7% 38%	98198
Transparency	Day	44% 7% 13% 22% 12% 2	105101
	Night	43% 7% 13% 22% 13% 2	102695
Seeing	Day	22% 16% 26% 21% 11% 4	14911
	Night	19% 14% 25% 28% 12% 1	24529

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	15% 14% 4 8% 6% 5% 4 3 4 5% 31%	2685
	11th to 20th	Day	11% 18% 7% 12% 8% 5% 5% 3 4 4 24%	2840
	21st to end	Day	17% 14% 7% 10% 6% 5% 4 3 4 5% 25%	3124
February	1st to 10th	Day	14% 14% 4 8% 8% 5% 5% 3 4 6% 30%	1710
	11th to 20th	Day	13% 9% 5% 11% 6% 5% 5% 4 6% 6% 31%	1663
	21st to end	Day	16% 10% 4 11% 6% 4 3 3 4 5% 34%	1572
March	1st to 10th	Day	19% 14% 3 7% 5% 4 4 3 4 6% 30%	3435
	11th to 20th	Day	11% 8% 4 7% 4 4 4 3 6% 8% 40%	3480
	21st to end	Day	15% 10% 3 8% 5% 4 4 3 4 6% 38%	3815
April	1st to 10th	Day	14% 11% 3 8% 5% 5% 4 4 5% 7% 33%	2255
	11th to 20th	Day	13% 9% 3 7% 5% 5% 4 4 4 6% 39%	2254
	21st to end	Day	20% 8% 3 6% 5% 4 4 3 6% 6% 35%	2374
May	1st to 10th	Day	26% 7% 3 7% 5% 5% 4 3 5% 6% 28%	4082
	11th to 20th	Day	26% 8% 2 6% 5% 4 4 3 5% 7% 30%	4166
	21st to end	Day	12% 5% 2 6% 4 5% 5% 5% 7% 10% 39%	4823
June	1st to 10th	Day	13% 6% 3 5% 5% 5% 5% 5% 7% 8% 39%	2660
	11th to 20th	Day	11% 6% 2 6% 5% 6% 6% 6% 7% 10% 35%	2660
	21st to end	Day	10% 5% 2 6% 5% 5% 5% 5% 7% 11% 39%	2660
July	1st to 10th	Day	7% 4 2 6% 5% 6% 6% 5% 7% 9% 44%	4440
	11th to 20th	Day	7% 5% 2 6% 6% 6% 6% 5% 7% 10% 40%	4167
	21st to end	Day	12% 8% 3 8% 6% 5% 5% 5% 6% 8% 36%	4466
August	1st to 10th	Day	17% 5% 2 7% 4 5% 6% 5% 7% 9% 31%	4104
	11th to 20th	Day	10% 5% 2 7% 5% 5% 6% 5% 7% 9% 38%	4026
	21st to end	Day	12% 5% 2 5% 4 5% 5% 4 6% 9% 42%	4180
September	1st to 10th	Day	16% 5% 2 5% 4 4 4 4 5% 6% 44%	2280
	11th to 20th	Day	14% 6% 2 5% 4 3 4 3 6% 7% 47%	2209
	21st to end	Day	21% 7% 3 6% 4 5% 4 2 6% 5% 36%	2024
October	1st to 10th	Day	16% 6% 2 6% 5% 4 5% 3 4 7% 42%	1900
	11th to 20th	Day	16% 7% 2 8% 5% 4 4 3 4 5% 41%	1900
	21st to end	Day	15% 7% 3 7% 5% 4 5% 3 5% 7% 41%	2090
November	1st to 10th	Day	10% 7% 3 6% 4 3 3 3 6% 7% 48%	1927
	11th to 20th	Day	14% 10% 3 6% 4 4 4 4 6% 7% 38%	1645
	21st to end	Day	15% 11% 3 8% 6% 5% 4 4 6% 6% 34%	1600
December	1st to 10th	Day	16% 11% 4 9% 6% 6% 5% 4 7% 7% 24%	1560
	11th to 20th	Day	15% 14% 4 7% 5% 5% 3 4 4 5% 33%	1910
	21st to end	Day	18% 13% 4 10% 6% 6% 5% 4 5% 6% 24%	2772
January	1st to 10th	Night	11% 12% 5% 10% 7% 6% 5% 4 5% 6% 29%	4258
	11th to 20th	Night	13% 14% 5% 11% 5% 4 4 3 4 5% 30%	4120
	21st to end	Night	19% 11% 6% 9% 7% 5% 4 3 5% 5% 26%	4532
February	1st to 10th	Night	14% 9% 3 8% 6% 5% 5% 4 6% 6% 35%	2470
	11th to 20th	Night	15% 10% 3 9% 5% 5% 5% 4 6% 7% 32%	2403
	21st to end	Night	14% 11% 4 9% 6% 4 5% 4 6% 6% 32%	1876
March	1st to 10th	Night	21% 10% 3 6% 5% 4 4 3 4 6% 34%	3418
	11th to 20th	Night	10% 9% 4 7% 4 4 4 3 5% 6% 43%	3480
	21st to end	Night	13% 8% 2 6% 5% 4 3 3 4 6% 46%	3817
April	1st to 10th	Night	16% 11% 2 7% 6% 5% 4 4 5% 5% 35%	1924
	11th to 20th	Night	13% 8% 2 6% 5% 4 4 3 6% 8% 40%	1875
	21st to end	Night	17% 6% 2 5% 4 4 4 4 5% 8% 41%	1821
May	1st to 10th	Night	26% 9% 3 7% 5% 4 4 4 5% 6% 28%	2813
	11th to 20th	Night	27% 8% 2 5% 4 4 4 4 5% 6% 31%	2727
	21st to end	Night	12% 5% 2 6% 4 5% 5% 4 7% 9% 42%	2732
June	1st to 10th	Night	12% 5% 2 5% 4 3 5% 4 6% 8% 46%	1520
	11th to 20th	Night	12% 5% 1 7% 4 4 5% 5% 5% 9% 43%	1520
	21st to end	Night	10% 4 2 5% 4 4 5% 4 8% 11% 44%	1520
July	1st to 10th	Night	7% 4 2 6% 4 6% 5% 5% 7% 10% 43%	2520
	11th to 20th	Night	6% 5% 2 7% 5% 5% 5% 4 7% 10% 45%	2775
	21st to end	Night	10% 7% 3 7% 5% 5% 5% 5% 6% 9% 39%	3087
August	1st to 10th	Night	15% 5% 3 7% 4 5% 5% 4 6% 9% 37%	2825
	11th to 20th	Night	10% 6% 2 8% 4 4 5% 4 6% 7% 45%	2785
	21st to end	Night	15% 5% 2 4 4 4 3 4 6% 7% 47%	3462
September	1st to 10th	Night	15% 6% 2 5% 3 3 4 3 5% 5% 48%	1900
	11th to 20th	Night	13% 5% 1 5% 3 3 4 3 5% 6% 51%	1967
	21st to end	Night	21% 6% 2 4 3 3 3 4 5% 6% 41%	2156
October	1st to 10th	Night	16% 6% 2 5% 4 4 4 4 5% 7% 43%	2280
	11th to 20th	Night	16% 4 2 5% 3 4 4 3 5% 7% 47%	2280
	21st to end	Night	17% 5% 2 5% 4 3 4 3 5% 6% 44%	2508
November	1st to 10th	Night	10% 7% 2 5% 4 4 4 3 5% 5% 51%	2369
	11th to 20th	Night	14% 9% 3 7% 5% 5% 4 4 6% 6% 39%	2752
	21st to end	Night	14% 8% 3 8% 5% 5% 5% 4 5% 6% 36%	2800
December	1st to 10th	Night	16% 12% 4 8% 4 4 4 4 6% 7% 31%	2737
	11th to 20th	Night	16% 9% 4 8% 5% 5% 5% 4 6% 6% 33%	3285
	21st to end	Night	17% 13% 3 8% 6% 5% 6% 4 6% 7% 24%	4884

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	52% 7% 13% 21% 5% 2	2686
	11th to 20th	Day	63% 5% 11% 12% 8% 1	2840
	21st to end	Day	60% 7% 12% 16% 5% 1	3124
February	1st to 10th	Day	54% 6% 14% 17% 8% 1	1710
	11th to 20th	Day	53% 5% 13% 19% 10%	1672
	21st to end	Day	52% 6% 12% 17% 10% 3	1572
March	1st to 10th	Day	53% 7% 12% 20% 8% 1	3435
	11th to 20th	Day	39% 7% 13% 27% 12% 2	3480
	21st to end	Day	46% 7% 13% 21% 12% 2	3815
April	1st to 10th	Day	48% 8% 11% 17% 13% 3	2255
	11th to 20th	Day	45% 7% 10% 18% 16% 3	2254
	21st to end	Day	47% 6% 11% 22% 11% 2	2374
May	1st to 10th	Day	54% 7% 9% 19% 9% 1	4120
	11th to 20th	Day	51% 8% 12% 20% 7% 2	4170
	21st to end	Day	37% 10% 15% 22% 14% 2	4837
June	1st to 10th	Day	40% 9% 14% 21% 15% 1	2660
	11th to 20th	Day	41% 11% 14% 20% 13% 1	2660
	21st to end	Day	37% 9% 16% 24% 13% 1	2660
July	1st to 10th	Day	36% 9% 14% 26% 10% 4	4370
	11th to 20th	Day	36% 9% 16% 25% 13% 1	4096
	21st to end	Day	44% 7% 10% 22% 16% 1	4324
August	1st to 10th	Day	45% 11% 15% 20% 8%	4091
	11th to 20th	Day	39% 9% 11% 27% 13%	4065
	21st to end	Day	36% 8% 14% 27% 14% 2	4180
September	1st to 10th	Day	39% 7% 12% 19% 19% 4	2280
	11th to 20th	Day	36% 5% 11% 26% 19% 2	2209
	21st to end	Day	47% 6% 13% 16% 16% 1	2024
October	1st to 10th	Day	36% 4 9% 25% 22% 4	3160
	11th to 20th	Day	35% 5% 13% 25% 12% 10%	3140
	21st to end	Day	28% 4 15% 29% 23% 1	3428
November	1st to 10th	Day	35% 5% 13% 23% 19% 4	1927
	11th to 20th	Day	44% 6% 13% 20% 15% 3	1645
	21st to end	Day	49% 6% 14% 21% 9% 1	1600
December	1st to 10th	Day	56% 8% 13% 17% 5% 1	1560
	11th to 20th	Day	52% 6% 12% 24% 6% 1	1906
	21st to end	Day	58% 8% 14% 12% 7%	2772
January	1st to 10th	Night	52% 7% 12% 18% 9% 1	4258
	11th to 20th	Night	53% 8% 15% 16% 7% 1	4120
	21st to end	Night	59% 6% 10% 19% 5% 1	4532
February	1st to 10th	Night	48% 7% 13% 22% 9% 1	2470
	11th to 20th	Night	50% 6% 11% 19% 13% 1	2405
	21st to end	Night	51% 7% 11% 19% 10% 3	1876
March	1st to 10th	Night	49% 6% 12% 24% 8% 1	3418
	11th to 20th	Night	40% 6% 12% 30% 10% 1	3480
	21st to end	Night	39% 6% 12% 23% 17% 3	3817
April	1st to 10th	Night	48% 7% 12% 17% 14% 2	1924
	11th to 20th	Night	40% 8% 12% 21% 16% 4	1875
	21st to end	Night	40% 7% 13% 25% 12% 3	1821
May	1st to 10th	Night	56% 7% 8% 17% 10% 3	2840
	11th to 20th	Night	51% 10% 12% 18% 9% 1	2728
	21st to end	Night	34% 11% 18% 24% 10% 3	2739
June	1st to 10th	Night	35% 8% 12% 27% 17% 1	1520
	11th to 20th	Night	36% 10% 14% 26% 12% 2	1520
	21st to end	Night	31% 10% 17% 25% 15% 1	1520
July	1st to 10th	Night	34% 10% 16% 21% 14% 5%	2480
	11th to 20th	Night	33% 9% 16% 26% 14% 2	2724
	21st to end	Night	39% 9% 14% 20% 17% 1	2988
August	1st to 10th	Night	42% 10% 17% 22% 9%	2814
	11th to 20th	Night	36% 8% 11% 28% 16% 1	2812
	21st to end	Night	35% 6% 14% 29% 14% 2	3462
September	1st to 10th	Night	38% 6% 12% 22% 19% 3	1900
	11th to 20th	Night	32% 6% 11% 29% 20% 2	1967
	21st to end	Night	42% 6% 11% 22% 16% 2	2156
October	1st to 10th	Night	36% 5% 9% 27% 22% 1	3800
	11th to 20th	Night	28% 6% 10% 25% 22% 9%	3779
	21st to end	Night	27% 4 12% 30% 23% 3	4120
November	1st to 10th	Night	34% 5% 13% 23% 20% 4	2369
	11th to 20th	Night	44% 6% 10% 23% 14% 3	2752
	21st to end	Night	46% 7% 13% 21% 11% 2	2800
December	1st to 10th	Night	50% 6% 14% 21% 8% 1	2737
	11th to 20th	Night	49% 7% 13% 21% 10% 1	3288
	21st to end	Night	54% 9% 17% 13% 6%	4884

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% 28% 24% 12% 3	229
	11th to 20th	Day	36% 27% 28% 8% 1	270
	21st to end	Day	29% 30% 26% 12% 3	297
February	1st to 10th	Day	31% 24% 33% 10% 2	270
	11th to 20th	Day	36% 30% 30% 4 1	270
	21st to end	Day	33% 26% 27% 12% 2	341
March	1st to 10th	Day	29% 21% 27% 19% 3	460
	11th to 20th	Day	30% 26% 26% 12% 4 1	460
	21st to end	Day	29% 21% 31% 13% 5% 1	506
April	1st to 10th	Day	28% 24% 25% 18% 5% 1	460
	11th to 20th	Day	22% 22% 27% 17% 7% 5%	452
	21st to end	Day	32% 18% 28% 14% 7% 2	460
May	1st to 10th	Day	28% 19% 24% 16% 9% 3	463
	11th to 20th	Day	25% 16% 27% 19% 10% 3	487
	21st to end	Day	20% 11% 23% 25% 14% 7%	529
June	1st to 10th	Day	18% 14% 27% 21% 16% 3	490
	11th to 20th	Day	15% 13% 28% 25% 15% 4	490
	21st to end	Day	11% 14% 31% 25% 14% 4	490
July	1st to 10th	Day	11% 7% 25% 29% 18% 9%	485
	11th to 20th	Day	6% 7% 27% 32% 20% 8%	484
	21st to end	Day	14% 7% 27% 30% 17% 5%	532
August	1st to 10th	Day	13% 7% 23% 28% 19% 9%	486
	11th to 20th	Day	14% 5% 25% 28% 19% 10%	479
	21st to end	Day	13% 5% 23% 27% 19% 12%	539
September	1st to 10th	Day	19% 8% 20% 22% 21% 9%	490
	11th to 20th	Day	16% 4 19% 31% 22% 8%	490
	21st to end	Day	27% 11% 24% 20% 14% 4	490
October	1st to 10th	Day	22% 9% 23% 24% 18% 4	490
	11th to 20th	Day	21% 15% 27% 24% 12% 2	490
	21st to end	Day	19% 19% 30% 21% 9% 2	539
November	1st to 10th	Day	16% 17% 30% 25% 11% 2	480
	11th to 20th	Day	24% 22% 27% 22% 4	245
	21st to end	Day	28% 23% 29% 17% 3 1	200
December	1st to 10th	Day	29% 26% 28% 11% 4 1	190
	11th to 20th	Day	27% 26% 26% 18% 4	180
	21st to end	Day	27% 21% 28% 19% 5%	198
January	1st to 10th	Night	21% 24% 34% 17% 3	760
	11th to 20th	Night	24% 20% 31% 21% 3	760
	21st to end	Night	22% 23% 31% 21% 2	836
February	1st to 10th	Night	23% 19% 31% 25% 2	760
	11th to 20th	Night	25% 27% 31% 16% 1	743
	21st to end	Night	25% 20% 31% 22% 2	628
March	1st to 10th	Night	24% 19% 32% 21% 3	760
	11th to 20th	Night	26% 22% 26% 20% 5% 1	760
	21st to end	Night	23% 18% 35% 19% 5% 1	836
April	1st to 10th	Night	24% 21% 28% 21% 5%	760
	11th to 20th	Night	18% 18% 28% 28% 9%	751
	21st to end	Night	21% 13% 27% 30% 8%	681
May	1st to 10th	Night	22% 12% 23% 29% 13% 1	570
	11th to 20th	Night	23% 10% 23% 33% 11%	515
	21st to end	Night	15% 7% 18% 35% 24% 1	411
June	1st to 10th	Night	13% 5% 24% 36% 21%	380
	11th to 20th	Night	13% 6% 22% 38% 21%	380
	21st to end	Night	10% 4 24% 39% 21% 1	380
July	1st to 10th	Night	10% 4 18% 38% 26% 3	370
	11th to 20th	Night	8% 3 14% 37% 35% 4	516
	21st to end	Night	10% 2 19% 37% 31% 2	624
August	1st to 10th	Night	9% 4 14% 41% 29% 2	567
	11th to 20th	Night	10% 5% 13% 41% 27% 4	564
	21st to end	Night	14% 3 16% 35% 29% 4	822
September	1st to 10th	Night	17% 4 17% 34% 24% 4	760
	11th to 20th	Night	15% 5% 15% 34% 28% 4	760
	21st to end	Night	25% 7% 18% 28% 19% 3	760
October	1st to 10th	Night	19% 7% 21% 29% 21% 2	760
	11th to 20th	Night	18% 13% 27% 31% 11% 1	760
	21st to end	Night	21% 14% 24% 31% 10% 1	836
November	1st to 10th	Night	14% 11% 28% 36% 11% 1	780
	11th to 20th	Night	21% 18% 25% 27% 7% 1	800
	21st to end	Night	21% 18% 28% 27% 6%	800
December	1st to 10th	Night	26% 19% 28% 22% 5%	783
	11th to 20th	Night	22% 18% 31% 26% 3	760
	21st to end	Night	22% 18% 29% 29% 2	836

Page generated at 2024-12-03 06:45:12. Version ac07

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