Buffalo Camp
Clear Sky Chart
History

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

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	8% 7% 2 6% 4 4 5% 4 6% 8% 46%	105789
	Night	7% 7% 3 7% 5% 4 5% 4 6% 8% 44%	102352
Transparency	Day	34% 6% 13% 26% 15% 5%	105520
	Night	36% 7% 14% 25% 15% 3	102210
Seeing	Day	11% 9% 27% 31% 18% 4	15892
	Night	11% 8% 27% 38% 15% 1	25397

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	6% 12% 4 9% 6% 5% 7% 6% 8% 9% 29%	2219
	11th to 20th	Day	4 10% 5% 9% 7% 6% 7% 5% 7% 8% 32%	2424
	21st to end	Day	4 9% 4 6% 5% 5% 5% 4 7% 8% 44%	2931
February	1st to 10th	Day	7% 13% 5% 11% 7% 6% 6% 4 6% 9% 26%	1710
	11th to 20th	Day	7% 13% 6% 9% 7% 5% 5% 5% 6% 8% 29%	1665
	21st to end	Day	5% 11% 5% 11% 6% 7% 5% 4 6% 7% 33%	1456
March	1st to 10th	Day	4 9% 4 11% 7% 6% 5% 5% 6% 8% 37%	3248
	11th to 20th	Day	5% 7% 2 6% 4 5% 5% 4 6% 10% 45%	3490
	21st to end	Day	13% 18% 6% 12% 5% 4 5% 4 5% 7% 21%	3930
April	1st to 10th	Day	9% 9% 2 8% 6% 5% 6% 4 6% 8% 37%	2280
	11th to 20th	Day	11% 12% 4 9% 5% 5% 4 5% 7% 7% 31%	2300
	21st to end	Day	12% 11% 3 7% 5% 4 5% 5% 6% 8% 36%	2494
May	1st to 10th	Day	17% 9% 3 7% 6% 5% 5% 4 6% 7% 33%	4430
	11th to 20th	Day	9% 5% 2 6% 4 5% 5% 5% 7% 9% 43%	4388
	21st to end	Day	14% 5% 2 6% 5% 6% 6% 5% 8% 9% 35%	4825
June	1st to 10th	Day	12% 5% 2 5% 5% 4 5% 4 6% 9% 42%	2764
	11th to 20th	Day	11% 5% 3 5% 5% 4 4 4 6% 8% 44%	2850
	21st to end	Day	5% 3 1 4 4 4 5% 4 7% 9% 54%	2850
July	1st to 10th	Day	3 2 1 5% 4 5% 6% 5% 7% 9% 52%	4740
	11th to 20th	Day	3 1 1 3 2 3 3 3 5% 8% 69%	4627
	21st to end	Day	2 2 1 3 3 3 4 3 6% 8% 65%	4802
August	1st to 10th	Day	5% 3 1 5% 4 4 4 4 6% 9% 54%	4295
	11th to 20th	Day	6% 3 1 4 3 3 4 4 6% 9% 56%	4028
	21st to end	Day	9% 4 1 4 3 3 3 3 4 6% 62%	4371
September	1st to 10th	Day	9% 4 2 4 3 3 3 3 5% 8% 57%	2280
	11th to 20th	Day	10% 4 2 5% 5% 3 4 3 7% 8% 50%	2280
	21st to end	Day	11% 5% 2 4 3 3 2 3 5% 7% 55%	2003
October	1st to 10th	Day	9% 5% 2 5% 3 3 3 2 4 7% 57%	3170
	11th to 20th	Day	7% 5% 2 5% 3 3 4 3 4 8% 56%	3150
	21st to end	Day	5% 5% 1 6% 4 4 5% 4 6% 9% 51%	3235
November	1st to 10th	Day	11% 9% 3 7% 6% 4 4 4 4 7% 42%	1582
	11th to 20th	Day	6% 7% 3 6% 6% 5% 5% 5% 6% 8% 42%	1600
	21st to end	Day	7% 10% 3 9% 6% 5% 5% 4 6% 7% 38%	1552
December	1st to 10th	Day	6% 12% 4 12% 5% 5% 4 4 5% 8% 34%	1520
	11th to 20th	Day	4 9% 3 9% 6% 5% 5% 4 6% 9% 39%	1858
	21st to end	Day	6% 8% 3 6% 5% 5% 5% 5% 7% 7% 42%	2442
January	1st to 10th	Night	4 9% 3 8% 6% 6% 6% 6% 7% 9% 37%	4726
	11th to 20th	Night	4 10% 5% 11% 6% 5% 6% 4 5% 7% 36%	4526
	21st to end	Night	4 8% 4 9% 5% 5% 5% 5% 7% 9% 38%	4767
February	1st to 10th	Night	7% 12% 5% 11% 6% 6% 6% 4 7% 7% 30%	2470
	11th to 20th	Night	5% 12% 4 13% 7% 6% 5% 4 6% 7% 31%	2402
	21st to end	Night	7% 10% 4 8% 6% 6% 5% 5% 6% 6% 37%	1998
March	1st to 10th	Night	6% 10% 4 9% 5% 5% 5% 5% 7% 8% 36%	3619
	11th to 20th	Night	7% 5% 2 5% 5% 4 5% 4 7% 8% 48%	3490
	21st to end	Night	13% 17% 6% 15% 6% 5% 4 3 5% 6% 19%	3718
April	1st to 10th	Night	9% 10% 3 7% 6% 5% 4 5% 5% 6% 39%	1900
	11th to 20th	Night	11% 10% 3 8% 5% 6% 5% 5% 6% 7% 34%	1826
	21st to end	Night	12% 7% 3 8% 4 5% 5% 5% 7% 8% 36%	1686
May	1st to 10th	Night	14% 7% 2 6% 4 4 4 4 6% 7% 42%	2540
	11th to 20th	Night	9% 6% 2 8% 5% 5% 5% 5% 7% 10% 39%	2517
	21st to end	Night	12% 5% 2 5% 3 3 4 4 8% 9% 45%	2762
June	1st to 10th	Night	10% 7% 2 5% 5% 5% 6% 4 6% 8% 41%	1413
	11th to 20th	Night	12% 5% 2 6% 5% 4 5% 4 6% 8% 44%	1330
	21st to end	Night	5% 3 1 5% 4 4 5% 4 5% 7% 57%	1330
July	1st to 10th	Night	4 3 1 5% 3 3 3 4 6% 8% 60%	2220
	11th to 20th	Night	4 2 1 3 3 4 4 4 5% 7% 64%	2334
	21st to end	Night	3 2 1 4 4 4 5% 5% 6% 8% 56%	2761
August	1st to 10th	Night	6% 4 2 6% 5% 4 4 4 6% 7% 52%	2641
	11th to 20th	Night	6% 3 2 5% 4 3 4 5% 8% 10% 51%	2811
	21st to end	Night	9% 4 1 4 3 3 4 4 5% 8% 55%	3296
September	1st to 10th	Night	8% 3 1 4 3 3 4 4 5% 8% 56%	1900
	11th to 20th	Night	10% 5% 2 5% 3 4 4 3 5% 8% 51%	1900
	21st to end	Night	11% 5% 2 4 3 3 3 3 5% 7% 55%	2175
October	1st to 10th	Night	9% 6% 2 5% 3 3 3 3 5% 6% 55%	3800
	11th to 20th	Night	6% 5% 2 5% 4 4 4 3 6% 8% 54%	3778
	21st to end	Night	6% 7% 3 6% 5% 4 5% 4 6% 8% 47%	4277
November	1st to 10th	Night	11% 10% 2 6% 4 4 5% 4 6% 7% 40%	2711
	11th to 20th	Night	6% 9% 3 8% 5% 5% 5% 4 7% 8% 40%	2800
	21st to end	Night	6% 8% 3 7% 5% 5% 5% 4 7% 9% 41%	2723
December	1st to 10th	Night	5% 11% 4 9% 7% 6% 7% 4 7% 8% 31%	2660
	11th to 20th	Night	4 10% 4 9% 5% 5% 4 4 6% 7% 42%	3331
	21st to end	Night	5% 7% 3 7% 4 4 4 4 6% 7% 51%	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	45% 10% 16% 24% 4	2219
	11th to 20th	Day	48% 9% 15% 18% 11% 1	2424
	21st to end	Day	36% 8% 23% 26% 8%	2931
February	1st to 10th	Day	53% 6% 16% 18% 7%	1710
	11th to 20th	Day	51% 8% 15% 19% 7% 1	1674
	21st to end	Day	48% 7% 17% 18% 8% 1	1456
March	1st to 10th	Day	43% 7% 14% 29% 6%	3248
	11th to 20th	Day	31% 9% 26% 24% 9%	3490
	21st to end	Day	60% 9% 14% 13% 3	3930
April	1st to 10th	Day	42% 8% 16% 24% 9% 1	2280
	11th to 20th	Day	47% 7% 13% 23% 8% 1	2303
	21st to end	Day	44% 7% 12% 24% 11% 1	2494
May	1st to 10th	Day	46% 8% 13% 21% 10% 2	4430
	11th to 20th	Day	32% 9% 13% 31% 13% 2	4392
	21st to end	Day	39% 10% 13% 26% 10% 2	4825
June	1st to 10th	Day	37% 8% 14% 27% 13% 2	2764
	11th to 20th	Day	35% 7% 15% 24% 15% 3	2850
	21st to end	Day	24% 7% 15% 33% 18% 4	2850
July	1st to 10th	Day	26% 5% 13% 28% 19% 9%	4666
	11th to 20th	Day	14% 4 7% 28% 29% 18%	4546
	21st to end	Day	16% 4 5% 24% 30% 21%	4651
August	1st to 10th	Day	25% 5% 7% 27% 24% 12%	4280
	11th to 20th	Day	25% 4 11% 32% 24% 5%	4067
	21st to end	Day	24% 3 9% 31% 28% 5%	4370
September	1st to 10th	Day	26% 4 9% 29% 23% 8%	2280
	11th to 20th	Day	30% 6% 15% 28% 16% 5%	2280
	21st to end	Day	29% 4 10% 31% 22% 4	2003
October	1st to 10th	Day	30% 3 8% 33% 21% 6%	3170
	11th to 20th	Day	28% 3 13% 33% 20% 2	3150
	21st to end	Day	30% 5% 12% 32% 19% 1	3235
November	1st to 10th	Day	41% 6% 14% 24% 13% 2	1582
	11th to 20th	Day	36% 8% 20% 24% 10% 1	1600
	21st to end	Day	43% 8% 18% 20% 10% 1	1552
December	1st to 10th	Day	47% 6% 16% 23% 9%	1520
	11th to 20th	Day	40% 8% 22% 25% 4 1	1856
	21st to end	Day	36% 7% 12% 26% 13% 6%	2442
January	1st to 10th	Night	39% 9% 23% 23% 5% 1	4726
	11th to 20th	Night	46% 6% 14% 18% 15% 1	4526
	21st to end	Night	38% 10% 20% 25% 6%	4767
February	1st to 10th	Night	51% 8% 14% 18% 8% 1	2470
	11th to 20th	Night	50% 8% 15% 19% 7%	2403
	21st to end	Night	45% 6% 14% 22% 11% 1	1998
March	1st to 10th	Night	41% 7% 14% 26% 12%	3619
	11th to 20th	Night	30% 9% 21% 31% 8%	3490
	21st to end	Night	64% 8% 13% 11% 4	3718
April	1st to 10th	Night	44% 6% 15% 22% 12% 1	1900
	11th to 20th	Night	46% 9% 13% 21% 10% 2	1826
	21st to end	Night	42% 7% 14% 21% 15% 1	1686
May	1st to 10th	Night	39% 7% 10% 28% 14% 2	2540
	11th to 20th	Night	35% 11% 10% 31% 11% 1	2518
	21st to end	Night	32% 9% 14% 30% 15% 1	2762
June	1st to 10th	Night	39% 7% 15% 25% 12% 2	1413
	11th to 20th	Night	37% 7% 13% 24% 17% 2	1330
	21st to end	Night	24% 6% 15% 30% 21% 4	1330
July	1st to 10th	Night	21% 5% 18% 31% 18% 7%	2185
	11th to 20th	Night	19% 4 7% 26% 29% 14%	2292
	21st to end	Night	22% 5% 6% 22% 33% 12%	2674
August	1st to 10th	Night	30% 5% 8% 22% 25% 10%	2633
	11th to 20th	Night	26% 5% 16% 29% 20% 4	2838
	21st to end	Night	27% 4 9% 30% 24% 5%	3296
September	1st to 10th	Night	26% 5% 8% 27% 23% 11%	1900
	11th to 20th	Night	32% 6% 12% 26% 18% 6%	1900
	21st to end	Night	29% 4 10% 28% 23% 5%	2175
October	1st to 10th	Night	30% 5% 8% 28% 25% 4	3800
	11th to 20th	Night	28% 4 10% 32% 24% 2	3778
	21st to end	Night	34% 6% 13% 28% 17% 2	4277
November	1st to 10th	Night	41% 7% 15% 22% 11% 3	2711
	11th to 20th	Night	39% 8% 16% 25% 10% 1	2800
	21st to end	Night	38% 7% 20% 23% 11% 1	2723
December	1st to 10th	Night	48% 8% 15% 19% 9% 1	2660
	11th to 20th	Night	40% 7% 20% 28% 5% 1	3332
	21st to end	Night	31% 6% 12% 30% 15% 7%	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	10% 11% 26% 28% 18% 7%	180
	11th to 20th	Day	15% 6% 21% 35% 16% 7%	240
	21st to end	Day	8% 11% 29% 34% 16% 2	297
February	1st to 10th	Day	19% 7% 32% 33% 9% 1	270
	11th to 20th	Day	11% 10% 35% 30% 13% 1	270
	21st to end	Day	11% 7% 36% 31% 12% 3	225
March	1st to 10th	Day	10% 11% 33% 32% 11% 3	336
	11th to 20th	Day	11% 10% 32% 32% 11% 5%	460
	21st to end	Day	14% 8% 31% 26% 17% 4	506
April	1st to 10th	Day	18% 11% 33% 28% 10%	460
	11th to 20th	Day	16% 15% 37% 25% 7% 1	452
	21st to end	Day	19% 12% 21% 33% 15% 1	484
May	1st to 10th	Day	14% 11% 23% 27% 21% 4	653
	11th to 20th	Day	13% 8% 24% 28% 21% 5%	675
	21st to end	Day	16% 9% 22% 27% 21% 5%	734
June	1st to 10th	Day	12% 9% 27% 27% 21% 5%	680
	11th to 20th	Day	14% 14% 33% 26% 11% 3	680
	21st to end	Day	8% 8% 25% 33% 21% 4	680
July	1st to 10th	Day	7% 5% 21% 39% 24% 5%	671
	11th to 20th	Day	4 5% 27% 40% 19% 4	668
	21st to end	Day	4 4 24% 37% 24% 7%	739
August	1st to 10th	Day	4 6% 22% 41% 20% 6%	612
	11th to 20th	Day	8% 6% 19% 34% 23% 10%	477
	21st to end	Day	8% 7% 23% 33% 24% 6%	539
September	1st to 10th	Day	8% 8% 27% 32% 20% 6%	490
	11th to 20th	Day	11% 7% 26% 28% 22% 6%	490
	21st to end	Day	14% 8% 28% 26% 18% 6%	394
October	1st to 10th	Day	18% 6% 22% 28% 19% 6%	300
	11th to 20th	Day	15% 9% 25% 32% 15% 4	300
	21st to end	Day	13% 14% 39% 21% 11% 2	330
November	1st to 10th	Day	18% 13% 29% 23% 14% 3	300
	11th to 20th	Day	11% 12% 40% 27% 9% 2	300
	21st to end	Day	11% 10% 38% 26% 14% 1	282
December	1st to 10th	Day	11% 10% 36% 24% 16% 4	270
	11th to 20th	Day	12% 10% 37% 25% 14% 2	250
	21st to end	Day	11% 7% 29% 30% 18% 5%	198
January	1st to 10th	Night	10% 8% 30% 37% 13% 1	950
	11th to 20th	Night	11% 10% 28% 35% 14% 1	950
	21st to end	Night	11% 10% 31% 37% 10% 1	978
February	1st to 10th	Night	11% 9% 24% 38% 16% 1	760
	11th to 20th	Night	10% 8% 30% 42% 9% 1	744
	21st to end	Night	9% 8% 25% 37% 17% 3	628
March	1st to 10th	Night	9% 8% 30% 37% 16% 1	760
	11th to 20th	Night	11% 6% 28% 39% 14% 1	760
	21st to end	Night	12% 9% 24% 38% 15% 1	777
April	1st to 10th	Night	14% 9% 25% 38% 13%	570
	11th to 20th	Night	16% 10% 30% 33% 10% 1	563
	21st to end	Night	16% 8% 24% 40% 12%	570
May	1st to 10th	Night	14% 5% 25% 41% 15% 1	570
	11th to 20th	Night	12% 7% 19% 40% 22% 1	561
	21st to end	Night	15% 7% 24% 33% 18% 2	617
June	1st to 10th	Night	11% 7% 26% 34% 20% 2	463
	11th to 20th	Night	13% 9% 29% 39% 10%	380
	21st to end	Night	6% 6% 24% 44% 19% 1	380
July	1st to 10th	Night	9% 4 21% 48% 18% 1	370
	11th to 20th	Night	7% 5% 24% 49% 14% 1	430
	21st to end	Night	4 2 24% 47% 22%	624
August	1st to 10th	Night	4 5% 25% 47% 18% 1	567
	11th to 20th	Night	6% 4 21% 46% 22% 1	564
	21st to end	Night	8% 6% 20% 42% 24%	627
September	1st to 10th	Night	9% 4 18% 44% 24% 1	570
	11th to 20th	Night	13% 4 23% 39% 20% 1	570
	21st to end	Night	14% 6% 19% 38% 21% 2	750
October	1st to 10th	Night	14% 7% 22% 36% 19% 2	760
	11th to 20th	Night	13% 11% 24% 38% 14% 1	760
	21st to end	Night	13% 10% 32% 33% 11% 1	931
November	1st to 10th	Night	15% 8% 30% 37% 9% 1	975
	11th to 20th	Night	11% 13% 33% 31% 12% 1	1000
	21st to end	Night	9% 10% 32% 41% 8%	973
December	1st to 10th	Night	11% 9% 29% 34% 16% 1	950
	11th to 20th	Night	9% 9% 31% 39% 11% 1	950
	21st to end	Night	12% 8% 29% 36% 14% 1	1045

Page generated at 2024-11-22 06:02:29. Version ac07

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