Victor Mine
Clear Sky Chart
History

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

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% 12% 4 10% 6% 5% 5% 4 6% 7% 26%	102199
	Night	13% 13% 5% 11% 7% 6% 6% 5% 6% 6% 24%	97122
Transparency	Day	55% 6% 12% 19% 7%	105571
	Night	58% 6% 12% 18% 6%	101838
Seeing	Day	20% 9% 28% 26% 13% 4	15616
	Night	19% 8% 29% 30% 12% 2	24627

By Month

Percentage Cloud Cover NE (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	7% 14% 7% 15% 9% 10% 9% 6% 10% 5% 8%	2208
	11th to 20th	Day	6% 11% 5% 17% 14% 10% 8% 9% 10% 5% 5%	2210
	21st to end	Day	11% 18% 7% 18% 6% 6% 7% 5% 5% 5% 11%	2687
February	1st to 10th	Day	6% 12% 6% 10% 7% 7% 8% 7% 11% 9% 17%	1520
	11th to 20th	Day	6% 12% 4 12% 8% 7% 8% 8% 10% 8% 18%	1611
	21st to end	Day	4 9% 4 12% 7% 7% 10% 9% 8% 8% 22%	1508
March	1st to 10th	Day	5% 9% 4 14% 10% 8% 9% 5% 8% 7% 22%	3118
	11th to 20th	Day	8% 14% 6% 18% 10% 9% 5% 4 6% 6% 14%	3434
	21st to end	Day	10% 12% 4 13% 7% 7% 7% 6% 6% 6% 21%	3924
April	1st to 10th	Day	12% 14% 4 10% 6% 6% 6% 4 4 5% 27%	2354
	11th to 20th	Day	13% 12% 5% 11% 5% 5% 5% 3 4 5% 31%	2442
	21st to end	Day	13% 12% 4 9% 5% 4 5% 3 5% 6% 34%	2470
May	1st to 10th	Day	13% 13% 5% 10% 6% 5% 5% 4 5% 6% 28%	4548
	11th to 20th	Day	20% 14% 4 9% 4 4 4 3 5% 6% 26%	4716
	21st to end	Day	18% 9% 3 7% 5% 4 4 4 6% 8% 33%	5185
June	1st to 10th	Day	19% 9% 3 8% 5% 4 4 3 5% 6% 33%	2850
	11th to 20th	Day	17% 6% 2 7% 4 4 5% 3 6% 8% 36%	2850
	21st to end	Day	17% 7% 2 7% 5% 5% 5% 4 5% 8% 36%	2850
July	1st to 10th	Day	14% 8% 2 6% 5% 4 4 4 5% 8% 38%	4760
	11th to 20th	Day	17% 7% 2 7% 5% 4 5% 4 6% 8% 34%	4760
	21st to end	Day	14% 8% 3 8% 6% 5% 6% 5% 7% 8% 30%	5162
August	1st to 10th	Day	22% 7% 2 5% 4 4 5% 4 6% 8% 32%	4461
	11th to 20th	Day	13% 6% 2 6% 4 4 4 4 5% 8% 44%	4167
	21st to end	Day	15% 7% 3 7% 5% 4 4 4 5% 7% 39%	4532
September	1st to 10th	Day	19% 11% 4 8% 5% 4 5% 3 6% 8% 27%	2380
	11th to 20th	Day	26% 11% 3 8% 5% 4 4 3 4 6% 26%	2090
	21st to end	Day	25% 13% 4 6% 4 4 4 3 5% 6% 27%	2090
October	1st to 10th	Day	23% 17% 4 7% 5% 5% 5% 4 5% 5% 19%	1976
	11th to 20th	Day	22% 23% 4 9% 5% 5% 3 3 4 5% 17%	1735
	21st to end	Day	19% 22% 6% 11% 6% 5% 3 3 4 5% 15%	1881
November	1st to 10th	Day	20% 21% 6% 12% 6% 5% 5% 3 5% 3 14%	1576
	11th to 20th	Day	19% 23% 9% 12% 6% 5% 3 3 3 5% 12%	1382
	21st to end	Day	17% 20% 6% 14% 9% 7% 4 3 3 5% 12%	1330
December	1st to 10th	Day	10% 15% 7% 16% 9% 6% 5% 4 6% 5% 16%	1330
	11th to 20th	Day	7% 14% 7% 14% 6% 11% 8% 5% 7% 7% 14%	1671
	21st to end	Day	10% 20% 6% 14% 9% 7% 6% 4 4 5% 15%	2431
January	1st to 10th	Night	8% 15% 6% 18% 10% 9% 9% 5% 7% 5% 9%	4748
	11th to 20th	Night	6% 13% 6% 17% 11% 10% 9% 8% 9% 5% 6%	4760
	21st to end	Night	9% 20% 7% 14% 6% 6% 7% 6% 8% 5% 13%	4980
February	1st to 10th	Night	5% 9% 4 12% 9% 7% 9% 9% 10% 10% 15%	2660
	11th to 20th	Night	7% 12% 5% 12% 8% 7% 10% 7% 9% 7% 17%	2455
	21st to end	Night	3 11% 4 11% 6% 6% 9% 9% 8% 8% 24%	1943
March	1st to 10th	Night	9% 10% 3 9% 8% 7% 6% 6% 6% 8% 27%	3722
	11th to 20th	Night	7% 12% 6% 17% 10% 8% 6% 5% 5% 6% 19%	3524
	21st to end	Night	9% 13% 5% 13% 7% 7% 6% 4 5% 5% 26%	3736
April	1st to 10th	Night	11% 12% 4 10% 7% 6% 6% 4 5% 5% 30%	1825
	11th to 20th	Night	13% 11% 4 10% 6% 5% 4 4 5% 6% 31%	1687
	21st to end	Night	12% 10% 4 9% 6% 5% 5% 3 5% 5% 36%	1710
May	1st to 10th	Night	14% 10% 4 11% 5% 4 5% 4 5% 6% 32%	2398
	11th to 20th	Night	19% 14% 4 8% 5% 4 4 4 5% 6% 28%	2189
	21st to end	Night	20% 10% 3 8% 5% 4 4 3 5% 7% 31%	2402
June	1st to 10th	Night	19% 8% 2 5% 4 5% 4 4 6% 6% 36%	1330
	11th to 20th	Night	16% 7% 2 7% 5% 4 4 4 5% 7% 37%	1330
	21st to end	Night	16% 6% 2 6% 4 4 5% 4 6% 6% 40%	1330
July	1st to 10th	Night	15% 7% 2 6% 4 4 5% 4 6% 8% 38%	2210
	11th to 20th	Night	14% 9% 3 6% 4 5% 5% 4 6% 7% 38%	2210
	21st to end	Night	14% 5% 2 6% 4 5% 4 4 6% 7% 43%	2402
August	1st to 10th	Night	19% 6% 2 6% 4 4 4 4 6% 9% 37%	2475
	11th to 20th	Night	11% 5% 3 6% 4 3 4 3 6% 9% 47%	2665
	21st to end	Night	10% 6% 2 6% 4 3 4 3 5% 10% 47%	3124
September	1st to 10th	Night	17% 10% 2 6% 4 5% 4 4 6% 7% 34%	1779
	11th to 20th	Night	21% 10% 3 9% 5% 5% 5% 4 5% 6% 26%	2090
	21st to end	Night	20% 10% 4 8% 5% 5% 4 3 5% 7% 30%	2090
October	1st to 10th	Night	22% 14% 3 7% 4 5% 4 3 4 5% 27%	2204
	11th to 20th	Night	21% 18% 4 10% 5% 6% 4 3 5% 7% 18%	2441
	21st to end	Night	17% 21% 7% 10% 5% 5% 5% 3 5% 6% 17%	2717
November	1st to 10th	Night	19% 22% 6% 13% 6% 4 4 3 4 5% 15%	2720
	11th to 20th	Night	18% 21% 7% 12% 6% 5% 4 3 4 5% 14%	2804
	21st to end	Night	14% 21% 8% 16% 7% 6% 4 3 4 5% 12%	2850
December	1st to 10th	Night	9% 19% 7% 16% 9% 5% 6% 5% 6% 6% 12%	2850
	11th to 20th	Night	8% 16% 5% 12% 9% 7% 8% 6% 7% 5% 16%	3526
	21st to end	Night	12% 14% 6% 13% 9% 7% 6% 4 6% 6% 17%	5236

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	68% 6% 12% 11% 3	2209
	11th to 20th	Day	73% 4 9% 10% 3	2210
	21st to end	Day	74% 3 5% 14% 4	2687
February	1st to 10th	Day	56% 6% 10% 19% 9%	1520
	11th to 20th	Day	57% 6% 11% 20% 6%	1620
	21st to end	Day	53% 5% 12% 22% 8%	1508
March	1st to 10th	Day	55% 7% 10% 15% 13%	3120
	11th to 20th	Day	69% 5% 9% 12% 5%	3434
	21st to end	Day	59% 6% 10% 16% 9%	3924
April	1st to 10th	Day	58% 5% 8% 16% 13% 1	2354
	11th to 20th	Day	54% 5% 8% 21% 11% 1	2442
	21st to end	Day	50% 6% 8% 22% 13% 2	2470
May	1st to 10th	Day	53% 9% 9% 21% 8% 1	4560
	11th to 20th	Day	57% 7% 10% 18% 7%	4720
	21st to end	Day	47% 7% 12% 26% 9%	5185
June	1st to 10th	Day	51% 5% 11% 21% 11% 1	2850
	11th to 20th	Day	45% 7% 11% 26% 11%	2850
	21st to end	Day	45% 8% 14% 24% 9% 1	2850
July	1st to 10th	Day	43% 8% 18% 26% 6%	4686
	11th to 20th	Day	45% 7% 17% 25% 5%	4679
	21st to end	Day	48% 9% 19% 20% 3	4999
August	1st to 10th	Day	49% 7% 17% 24% 3	4445
	11th to 20th	Day	38% 6% 15% 36% 4	4209
	21st to end	Day	45% 6% 14% 23% 12%	4531
September	1st to 10th	Day	55% 9% 16% 16% 4	2380
	11th to 20th	Day	60% 5% 14% 19% 2	2090
	21st to end	Day	58% 6% 11% 18% 7%	2090
October	1st to 10th	Day	64% 6% 14% 13% 3	3288
	11th to 20th	Day	60% 6% 17% 15% 2	2860
	21st to end	Day	69% 5% 9% 15% 2	3081
November	1st to 10th	Day	73% 5% 10% 10% 2	1576
	11th to 20th	Day	77% 4 7% 9% 2	1382
	21st to end	Day	76% 4 7% 9% 3	1330
December	1st to 10th	Day	66% 6% 10% 14% 5%	1330
	11th to 20th	Day	62% 5% 11% 16% 6%	1671
	21st to end	Day	70% 4 6% 13% 7% 1	2431
January	1st to 10th	Night	73% 5% 11% 10% 1	4748
	11th to 20th	Night	72% 6% 11% 9% 3	4760
	21st to end	Night	68% 6% 7% 15% 5%	4980
February	1st to 10th	Night	57% 7% 11% 19% 7%	2660
	11th to 20th	Night	59% 6% 10% 18% 7%	2457
	21st to end	Night	50% 7% 12% 20% 10%	1943
March	1st to 10th	Night	50% 5% 11% 22% 11%	3733
	11th to 20th	Night	64% 7% 8% 15% 6%	3525
	21st to end	Night	57% 5% 8% 17% 12% 1	3736
April	1st to 10th	Night	55% 5% 9% 17% 13% 2	1825
	11th to 20th	Night	53% 5% 9% 21% 12% 1	1687
	21st to end	Night	50% 5% 6% 22% 15% 2	1710
May	1st to 10th	Night	50% 6% 11% 23% 10% 1	2405
	11th to 20th	Night	54% 7% 13% 17% 8%	2190
	21st to end	Night	50% 7% 10% 23% 10%	2403
June	1st to 10th	Night	46% 7% 11% 23% 13%	1330
	11th to 20th	Night	46% 7% 12% 21% 14%	1330
	21st to end	Night	41% 7% 14% 26% 11% 1	1330
July	1st to 10th	Night	42% 9% 16% 31% 3	2175
	11th to 20th	Night	44% 7% 16% 25% 8%	2168
	21st to end	Night	38% 8% 25% 27% 2	2325
August	1st to 10th	Night	43% 9% 16% 27% 4	2467
	11th to 20th	Night	34% 6% 21% 34% 4	2689
	21st to end	Night	34% 6% 14% 36% 9%	3124
September	1st to 10th	Night	46% 9% 18% 22% 5%	1779
	11th to 20th	Night	57% 8% 15% 16% 3	2090
	21st to end	Night	54% 7% 15% 18% 6%	2090
October	1st to 10th	Night	57% 5% 13% 20% 4	3672
	11th to 20th	Night	57% 7% 16% 18% 2	4055
	21st to end	Night	66% 6% 10% 16% 2	4467
November	1st to 10th	Night	72% 6% 9% 9% 3	2720
	11th to 20th	Night	72% 6% 10% 11% 1	2804
	21st to end	Night	75% 4 8% 10% 2	2850
December	1st to 10th	Night	70% 6% 9% 13% 2	2850
	11th to 20th	Night	64% 5% 10% 14% 6%	3525
	21st to end	Night	67% 5% 7% 14% 8%	5236

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	10% 12% 33% 24% 17% 3	180
	11th to 20th	Day	12% 9% 25% 32% 14% 7%	180
	21st to end	Day	13% 4 24% 35% 17% 6%	270
February	1st to 10th	Day	8% 9% 31% 33% 16% 3	270
	11th to 20th	Day	10% 7% 37% 26% 13% 6%	270
	21st to end	Day	9% 12% 40% 26% 11% 2	225
March	1st to 10th	Day	12% 12% 30% 24% 16% 6%	270
	11th to 20th	Day	12% 12% 29% 30% 14% 4	427
	21st to end	Day	11% 8% 31% 33% 14% 3	506
April	1st to 10th	Day	14% 7% 29% 30% 16% 4	460
	11th to 20th	Day	20% 11% 26% 25% 11% 6%	452
	21st to end	Day	15% 8% 29% 27% 15% 5%	460
May	1st to 10th	Day	19% 11% 29% 24% 15% 3	612
	11th to 20th	Day	21% 14% 26% 26% 10% 3	675
	21st to end	Day	23% 9% 28% 27% 10% 3	734
June	1st to 10th	Day	20% 9% 30% 25% 12% 3	680
	11th to 20th	Day	20% 8% 27% 27% 14% 4	680
	21st to end	Day	19% 8% 30% 24% 16% 4	680
July	1st to 10th	Day	17% 8% 26% 27% 16% 5%	671
	11th to 20th	Day	19% 7% 25% 31% 16% 2	668
	21st to end	Day	20% 7% 22% 28% 17% 7%	739
August	1st to 10th	Day	24% 6% 22% 26% 17% 4	676
	11th to 20th	Day	19% 7% 21% 25% 18% 10%	554
	21st to end	Day	23% 6% 25% 25% 14% 6%	539
September	1st to 10th	Day	21% 9% 29% 29% 9% 3	490
	11th to 20th	Day	26% 10% 25% 23% 12% 4	490
	21st to end	Day	28% 8% 28% 20% 12% 4	490
October	1st to 10th	Day	28% 12% 27% 21% 9% 3	490
	11th to 20th	Day	32% 12% 25% 18% 10% 3	325
	21st to end	Day	23% 11% 33% 21% 9% 3	330
November	1st to 10th	Day	28% 12% 28% 22% 9% 1	205
	11th to 20th	Day	27% 12% 27% 24% 7% 3	180
	21st to end	Day	24% 12% 37% 16% 7% 3	180
December	1st to 10th	Day	17% 6% 31% 32% 9% 5%	180
	11th to 20th	Day	15% 7% 31% 32% 10% 5%	180
	21st to end	Day	15% 7% 31% 27% 16% 4	198
January	1st to 10th	Night	16% 9% 31% 33% 10% 1	950
	11th to 20th	Night	16% 10% 26% 34% 12% 2	950
	21st to end	Night	13% 8% 26% 31% 18% 4	1045
February	1st to 10th	Night	8% 7% 29% 37% 17% 1	950
	11th to 20th	Night	12% 6% 31% 33% 15% 3	795
	21st to end	Night	8% 7% 25% 37% 19% 4	628
March	1st to 10th	Night	14% 7% 29% 33% 14% 2	760
	11th to 20th	Night	11% 9% 35% 33% 11% 2	760
	21st to end	Night	14% 9% 31% 32% 13% 2	793
April	1st to 10th	Night	17% 7% 34% 29% 12% 1	570
	11th to 20th	Night	16% 7% 30% 33% 12% 2	563
	21st to end	Night	16% 7% 30% 32% 14% 1	570
May	1st to 10th	Night	21% 9% 26% 31% 11% 1	461
	11th to 20th	Night	20% 10% 35% 26% 9%	374
	21st to end	Night	22% 10% 33% 28% 6%	411
June	1st to 10th	Night	22% 8% 31% 26% 12%	380
	11th to 20th	Night	19% 6% 31% 33% 10% 1	380
	21st to end	Night	18% 7% 30% 35% 10%	380
July	1st to 10th	Night	19% 8% 27% 33% 12%	370
	11th to 20th	Night	12% 4 33% 38% 13%	368
	21st to end	Night	17% 5% 27% 34% 16% 1	416
August	1st to 10th	Night	19% 4 17% 43% 16% 1	538
	11th to 20th	Night	19% 5% 23% 35% 17% 1	564
	21st to end	Night	19% 7% 25% 32% 17% 2	627
September	1st to 10th	Night	20% 5% 30% 34% 10% 1	573
	11th to 20th	Night	26% 8% 28% 29% 9%	760
	21st to end	Night	25% 9% 27% 30% 9% 1	760
October	1st to 10th	Night	28% 10% 32% 22% 7% 1	760
	11th to 20th	Night	31% 8% 27% 21% 12% 1	760
	21st to end	Night	25% 9% 30% 24% 10% 2	836
November	1st to 10th	Night	29% 10% 28% 22% 9% 1	780
	11th to 20th	Night	27% 11% 30% 23% 9% 1	900
	21st to end	Night	26% 13% 31% 21% 8% 1	950
December	1st to 10th	Night	16% 11% 34% 26% 11% 2	950
	11th to 20th	Night	16% 9% 29% 28% 16% 2	950
	21st to end	Night	20% 8% 32% 24% 12% 5%	1045

Page generated at 2024-11-08 06:44:50. Version ac07

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