Baxter Conservation Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Baxter Conservation Area clear sky chart from 2005-11-06 to 2024-11-30.

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	17% 10% 3 8% 5% 5% 5% 4 5% 6% 33%	101776
	Night	18% 11% 4 8% 5% 4 4 3 5% 6% 32%	97811
Transparency	Day	49% 8% 12% 21% 9% 1	105259
	Night	51% 7% 12% 19% 9% 1	102417
Seeing	Day	22% 15% 31% 21% 9% 3	14571
	Night	22% 13% 29% 26% 9% 1	23678

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	16% 16% 5% 12% 7% 6% 4 3 4 4 22%	2517
	11th to 20th	Day	15% 15% 5% 13% 7% 6% 5% 4 5% 5% 22%	2520
	21st to end	Day	16% 17% 7% 12% 7% 6% 5% 4 5% 5% 17%	2882
February	1st to 10th	Day	17% 15% 5% 11% 7% 5% 3 4 5% 4 24%	1710
	11th to 20th	Day	13% 16% 5% 10% 7% 5% 5% 3 5% 5% 27%	1682
	21st to end	Day	20% 14% 4 10% 6% 4 5% 4 5% 5% 24%	1570
March	1st to 10th	Day	20% 13% 4 9% 6% 5% 4 3 4 5% 27%	3116
	11th to 20th	Day	13% 15% 5% 9% 6% 5% 5% 3 5% 6% 29%	3469
	21st to end	Day	14% 8% 3 6% 6% 3 4 3 5% 6% 41%	4034
April	1st to 10th	Day	22% 11% 3 6% 5% 4 4 3 5% 6% 32%	2280
	11th to 20th	Day	22% 9% 3 7% 5% 4 3 2 4 5% 36%	2254
	21st to end	Day	23% 9% 3 8% 5% 4 4 3 4 5% 31%	2394
May	1st to 10th	Day	20% 8% 4 7% 5% 4 4 4 5% 7% 31%	4426
	11th to 20th	Day	18% 10% 3 8% 5% 4 4 3 5% 7% 32%	4398
	21st to end	Day	15% 7% 2 6% 5% 5% 5% 4 6% 7% 39%	4837
June	1st to 10th	Day	22% 8% 3 7% 5% 5% 4 4 5% 7% 30%	2660
	11th to 20th	Day	15% 5% 2 6% 4 5% 4 5% 6% 8% 37%	2660
	21st to end	Day	20% 7% 2 7% 5% 5% 4 4 6% 6% 32%	2660
July	1st to 10th	Day	12% 6% 2 7% 5% 5% 6% 5% 7% 9% 36%	4440
	11th to 20th	Day	13% 6% 2 6% 5% 5% 5% 4 7% 9% 39%	4440
	21st to end	Day	11% 6% 2 6% 4 4 5% 5% 7% 9% 42%	4814
August	1st to 10th	Day	15% 8% 3 8% 5% 4 5% 4 5% 7% 35%	4360
	11th to 20th	Day	17% 6% 2 6% 4 5% 5% 4 6% 8% 39%	3962
	21st to end	Day	16% 5% 2 6% 4 4 4 4 7% 9% 39%	4180
September	1st to 10th	Day	14% 5% 2 6% 4 5% 4 4 5% 7% 42%	2280
	11th to 20th	Day	14% 5% 2 6% 4 4 4 3 4 7% 48%	2274
	21st to end	Day	19% 5% 2 5% 4 3 5% 4 7% 6% 40%	2039
October	1st to 10th	Day	20% 8% 3 6% 6% 4 4 3 5% 6% 35%	1900
	11th to 20th	Day	20% 9% 4 9% 5% 5% 5% 4 6% 5% 29%	1900
	21st to end	Day	26% 10% 4 6% 4 5% 5% 3 4 5% 28%	1933
November	1st to 10th	Day	16% 9% 3 7% 5% 5% 7% 4 5% 7% 33%	1761
	11th to 20th	Day	17% 13% 4 7% 6% 5% 5% 3 5% 5% 30%	1628
	21st to end	Day	21% 15% 4 10% 5% 5% 5% 4 5% 6% 21%	1598
December	1st to 10th	Day	23% 18% 3 12% 6% 4 4 3 6% 5% 16%	1520
	11th to 20th	Day	22% 16% 5% 9% 5% 5% 4 3 4 5% 24%	1906
	21st to end	Day	27% 18% 5% 11% 5% 3 4 3 3 3 20%	2772
January	1st to 10th	Night	17% 16% 7% 11% 5% 5% 4 3 5% 6% 21%	4429
	11th to 20th	Night	14% 15% 6% 14% 7% 5% 5% 4 5% 4 20%	4440
	21st to end	Night	18% 19% 6% 11% 5% 5% 4 3 4 4 21%	4756
February	1st to 10th	Night	16% 15% 6% 12% 6% 5% 5% 4 5% 6% 22%	2470
	11th to 20th	Night	13% 15% 5% 12% 6% 4 5% 3 5% 4 29%	2384
	21st to end	Night	16% 14% 5% 9% 6% 4 4 3 5% 5% 28%	1884
March	1st to 10th	Night	21% 12% 4 8% 5% 4 4 2 4 5% 32%	3724
	11th to 20th	Night	18% 16% 5% 9% 5% 4 3 3 5% 5% 27%	3488
	21st to end	Night	16% 10% 3 6% 4 5% 4 3 4 5% 41%	3597
April	1st to 10th	Night	20% 11% 3 7% 5% 5% 3 2 4 5% 34%	1900
	11th to 20th	Night	20% 9% 3 6% 5% 4 4 3 4 6% 35%	1875
	21st to end	Night	22% 9% 3 8% 4 4 4 4 4 6% 34%	1800
May	1st to 10th	Night	22% 9% 3 6% 4 5% 5% 5% 5% 7% 29%	2514
	11th to 20th	Night	20% 9% 3 7% 4 4 4 3 5% 6% 35%	2495
	21st to end	Night	14% 6% 2 6% 4 4 4 4 6% 8% 40%	2738
June	1st to 10th	Night	16% 8% 3 8% 5% 5% 4 5% 6% 8% 32%	1520
	11th to 20th	Night	16% 5% 3 6% 4 4 4 4 6% 8% 40%	1520
	21st to end	Night	19% 7% 3 7% 4 4 4 3 6% 7% 35%	1520
July	1st to 10th	Night	11% 7% 3 9% 6% 6% 4 4 8% 8% 35%	2520
	11th to 20th	Night	13% 6% 2 6% 4 4 4 4 5% 8% 43%	2520
	21st to end	Night	11% 7% 2 6% 4 5% 5% 4 7% 7% 43%	2739
August	1st to 10th	Night	13% 7% 3 7% 4 4 5% 4 6% 8% 40%	2565
	11th to 20th	Night	12% 7% 3 7% 4 5% 4 4 6% 8% 40%	2833
	21st to end	Night	10% 6% 3 6% 4 4 5% 4 7% 8% 42%	3476
September	1st to 10th	Night	13% 5% 3 6% 4 4 4 3 5% 6% 46%	1900
	11th to 20th	Night	14% 5% 1 5% 3 3 3 3 5% 7% 51%	1905
	21st to end	Night	16% 6% 3 6% 4 4 3 3 4 7% 43%	2137
October	1st to 10th	Night	17% 7% 3 8% 4 4 5% 3 5% 7% 38%	2280
	11th to 20th	Night	21% 9% 3 7% 4 4 4 4 5% 6% 33%	2280
	21st to end	Night	24% 10% 3 7% 5% 4 5% 4 5% 7% 27%	2665
November	1st to 10th	Night	20% 10% 3 7% 5% 4 4 3 4 5% 35%	2537
	11th to 20th	Night	17% 11% 3 8% 6% 4 4 3 4 6% 32%	2770
	21st to end	Night	21% 15% 4 9% 5% 5% 4 3 6% 5% 24%	2798
December	1st to 10th	Night	21% 18% 5% 10% 6% 5% 4 4 5% 5% 18%	2660
	11th to 20th	Night	23% 15% 4 9% 5% 3 3 3 3 4 27%	3288
	21st to end	Night	32% 16% 4 11% 5% 4 3 3 3 4 17%	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	62% 11% 13% 8% 5% 1	2518
	11th to 20th	Day	61% 9% 13% 10% 7% 1	2520
	21st to end	Day	69% 9% 10% 8% 4	2882
February	1st to 10th	Day	62% 6% 9% 18% 4 1	1710
	11th to 20th	Day	58% 7% 11% 16% 8% 1	1691
	21st to end	Day	61% 6% 10% 13% 8% 1	1570
March	1st to 10th	Day	57% 7% 10% 17% 8%	3119
	11th to 20th	Day	53% 9% 13% 14% 8% 2	3469
	21st to end	Day	41% 7% 9% 22% 17% 3	4034
April	1st to 10th	Day	53% 6% 8% 18% 13% 2	2280
	11th to 20th	Day	50% 6% 8% 19% 15% 2	2254
	21st to end	Day	54% 6% 9% 14% 14% 4	2394
May	1st to 10th	Day	49% 9% 11% 20% 9% 2	4440
	11th to 20th	Day	49% 9% 13% 19% 9% 1	4402
	21st to end	Day	40% 9% 13% 23% 14% 1	4837
June	1st to 10th	Day	52% 9% 11% 17% 11% 1	2660
	11th to 20th	Day	42% 8% 12% 23% 12% 2	2660
	21st to end	Day	50% 9% 11% 19% 10% 1	2660
July	1st to 10th	Day	41% 7% 13% 26% 12%	4370
	11th to 20th	Day	38% 9% 14% 30% 9%	4365
	21st to end	Day	37% 9% 13% 32% 10%	4661
August	1st to 10th	Day	47% 6% 14% 23% 9%	4346
	11th to 20th	Day	42% 7% 14% 28% 8%	4001
	21st to end	Day	40% 7% 16% 26% 11%	4180
September	1st to 10th	Day	38% 9% 15% 26% 12%	2280
	11th to 20th	Day	36% 6% 13% 31% 13%	2274
	21st to end	Day	42% 8% 14% 26% 9%	2039
October	1st to 10th	Day	46% 5% 11% 29% 8%	3160
	11th to 20th	Day	46% 6% 15% 25% 7%	3140
	21st to end	Day	47% 6% 17% 22% 7%	3158
November	1st to 10th	Day	48% 8% 15% 21% 6% 1	1761
	11th to 20th	Day	55% 7% 11% 16% 10% 1	1628
	21st to end	Day	63% 9% 12% 11% 5%	1598
December	1st to 10th	Day	69% 8% 12% 9% 2 1	1520
	11th to 20th	Day	63% 7% 14% 13% 3	1906
	21st to end	Day	71% 5% 7% 13% 3	2772
January	1st to 10th	Night	63% 9% 14% 10% 4	4429
	11th to 20th	Night	63% 11% 13% 9% 4	4440
	21st to end	Night	67% 7% 10% 10% 5% 1	4756
February	1st to 10th	Night	62% 6% 11% 14% 6% 1	2470
	11th to 20th	Night	57% 6% 11% 19% 7%	2386
	21st to end	Night	57% 6% 9% 18% 9% 1	1884
March	1st to 10th	Night	54% 6% 10% 20% 9% 1	3734
	11th to 20th	Night	56% 8% 14% 14% 7% 1	3489
	21st to end	Night	44% 5% 9% 22% 17% 3	3597
April	1st to 10th	Night	53% 5% 9% 19% 12% 2	1900
	11th to 20th	Night	50% 6% 8% 20% 15% 1	1875
	21st to end	Night	51% 6% 9% 16% 15% 3	1800
May	1st to 10th	Night	50% 11% 11% 17% 9% 3	2520
	11th to 20th	Night	45% 11% 13% 19% 11% 1	2496
	21st to end	Night	38% 10% 14% 20% 17% 2	2739
June	1st to 10th	Night	47% 9% 14% 18% 11% 1	1520
	11th to 20th	Night	40% 7% 14% 20% 17% 2	1520
	21st to end	Night	47% 8% 13% 18% 13% 1	1520
July	1st to 10th	Night	44% 7% 14% 20% 14% 1	2480
	11th to 20th	Night	38% 7% 14% 33% 8%	2472
	21st to end	Night	38% 9% 15% 22% 15%	2651
August	1st to 10th	Night	41% 9% 14% 25% 11%	2555
	11th to 20th	Night	41% 7% 16% 29% 7%	2860
	21st to end	Night	38% 8% 14% 27% 12% 1	3476
September	1st to 10th	Night	38% 8% 11% 28% 14% 1	1900
	11th to 20th	Night	32% 8% 15% 33% 12% 1	1905
	21st to end	Night	40% 7% 12% 28% 12% 1	2137
October	1st to 10th	Night	41% 6% 13% 29% 11%	3800
	11th to 20th	Night	43% 5% 16% 27% 9%	3779
	21st to end	Night	49% 5% 16% 20% 8%	4390
November	1st to 10th	Night	50% 6% 13% 20% 9% 1	2537
	11th to 20th	Night	53% 6% 12% 18% 10% 1	2770
	21st to end	Night	61% 7% 12% 15% 5%	2798
December	1st to 10th	Night	68% 7% 10% 12% 3	2660
	11th to 20th	Night	62% 5% 10% 15% 7% 1	3288
	21st to end	Night	72% 6% 8% 12% 3	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	22% 20% 32% 21% 5% 1	180
	11th to 20th	Day	29% 17% 35% 12% 5% 1	180
	21st to end	Day	23% 16% 37% 17% 6% 1	231
February	1st to 10th	Day	30% 22% 34% 11% 3	270
	11th to 20th	Day	24% 24% 40% 12%	289
	21st to end	Day	29% 17% 35% 17% 3	382
March	1st to 10th	Day	24% 17% 35% 18% 7%	460
	11th to 20th	Day	22% 20% 34% 18% 4 1	460
	21st to end	Day	26% 21% 29% 15% 7% 2	506
April	1st to 10th	Day	28% 17% 33% 15% 6% 1	460
	11th to 20th	Day	29% 21% 23% 16% 8% 2	452
	21st to end	Day	30% 18% 31% 13% 7% 2	460
May	1st to 10th	Day	24% 16% 31% 21% 7% 2	463
	11th to 20th	Day	16% 19% 35% 18% 9% 3	487
	21st to end	Day	18% 17% 31% 22% 11% 1	529
June	1st to 10th	Day	24% 14% 29% 23% 9% 2	490
	11th to 20th	Day	16% 14% 32% 25% 10% 3	490
	21st to end	Day	23% 13% 33% 19% 9% 3	490
July	1st to 10th	Day	13% 7% 31% 32% 14% 3	485
	11th to 20th	Day	12% 10% 34% 27% 13% 4	484
	21st to end	Day	13% 7% 34% 28% 15% 2	532
August	1st to 10th	Day	15% 9% 26% 31% 14% 4	486
	11th to 20th	Day	17% 6% 23% 30% 17% 8%	479
	21st to end	Day	15% 10% 29% 25% 14% 7%	539
September	1st to 10th	Day	15% 12% 29% 23% 13% 8%	490
	11th to 20th	Day	13% 7% 26% 21% 20% 13%	490
	21st to end	Day	19% 10% 30% 20% 16% 5%	490
October	1st to 10th	Day	23% 13% 29% 20% 11% 6%	490
	11th to 20th	Day	24% 19% 26% 23% 6% 1	490
	21st to end	Day	32% 14% 27% 21% 5%	456
November	1st to 10th	Day	27% 19% 28% 19% 7% 1	395
	11th to 20th	Day	24% 22% 36% 11% 5% 2	228
	21st to end	Day	28% 21% 34% 13% 5% 1	200
December	1st to 10th	Day	31% 18% 34% 14% 3	180
	11th to 20th	Day	29% 24% 33% 11% 3 1	180
	21st to end	Day	33% 19% 27% 18% 3 1	198
January	1st to 10th	Night	25% 18% 32% 20% 5%	760
	11th to 20th	Night	27% 19% 27% 21% 5% 1	760
	21st to end	Night	21% 12% 35% 26% 6%	836
February	1st to 10th	Night	23% 17% 36% 20% 4	760
	11th to 20th	Night	21% 18% 36% 21% 3	743
	21st to end	Night	23% 19% 32% 22% 4	628
March	1st to 10th	Night	25% 13% 34% 23% 4	760
	11th to 20th	Night	23% 21% 30% 21% 5%	760
	21st to end	Night	23% 14% 28% 26% 8%	836
April	1st to 10th	Night	25% 14% 31% 24% 5%	760
	11th to 20th	Night	24% 19% 28% 22% 7%	751
	21st to end	Night	27% 14% 28% 25% 7% 1	660
May	1st to 10th	Night	26% 8% 28% 27% 9% 2	380
	11th to 20th	Night	20% 11% 31% 28% 10%	374
	21st to end	Night	13% 10% 37% 26% 13%	411
June	1st to 10th	Night	17% 7% 32% 35% 9%	380
	11th to 20th	Night	16% 11% 28% 32% 12% 1	380
	21st to end	Night	20% 6% 32% 28% 13% 1	380
July	1st to 10th	Night	8% 9% 26% 45% 11% 1	370
	11th to 20th	Night	15% 4 24% 39% 17% 1	368
	21st to end	Night	11% 3 29% 46% 10% 1	416
August	1st to 10th	Night	15% 4 23% 40% 18%	411
	11th to 20th	Night	14% 3 23% 36% 23% 2	586
	21st to end	Night	14% 6% 27% 31% 19% 2	836
September	1st to 10th	Night	15% 8% 27% 32% 17% 1	760
	11th to 20th	Night	16% 7% 21% 30% 22% 4	760
	21st to end	Night	18% 9% 24% 26% 21% 2	760
October	1st to 10th	Night	21% 10% 29% 23% 15% 2	760
	11th to 20th	Night	24% 14% 28% 25% 8% 1	760
	21st to end	Night	29% 14% 27% 24% 6%	836
November	1st to 10th	Night	27% 15% 26% 23% 8% 1	780
	11th to 20th	Night	23% 18% 32% 18% 9%	800
	21st to end	Night	29% 17% 27% 20% 6%	800
December	1st to 10th	Night	30% 15% 30% 20% 4 1	760
	11th to 20th	Night	28% 16% 31% 19% 6% 1	760
	21st to end	Night	34% 15% 29% 19% 3	836

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