Upper Gagetown
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Upper Gagetown clear sky chart from 2005-11-06 to 2025-01-22.

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	18% 9% 3 7% 5% 4 4 4 5% 7% 33%	105027
	Night	19% 10% 3 8% 5% 4 4 4 5% 6% 33%	104443
Transparency	Day	49% 6% 12% 21% 11% 1	108557
	Night	51% 6% 12% 21% 10% 1	109004
Seeing	Day	26% 16% 31% 19% 7% 1	16622
	Night	25% 15% 31% 22% 6%	24593

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	13% 14% 4 11% 5% 4 3 3 5% 6% 31%	2277
	11th to 20th	Day	14% 12% 5% 9% 5% 5% 3 3 4 4 35%	2514
	21st to end	Day	13% 10% 3 8% 4 4 5% 5% 6% 8% 34%	3039
February	1st to 10th	Day	16% 12% 4 6% 5% 5% 5% 4 6% 6% 31%	1710
	11th to 20th	Day	15% 12% 4 7% 6% 6% 5% 5% 5% 6% 30%	1663
	21st to end	Day	11% 11% 3 7% 7% 4 5% 4 5% 6% 37%	1513
March	1st to 10th	Day	21% 13% 5% 9% 5% 3 4 3 5% 5% 28%	3302
	11th to 20th	Day	17% 15% 4 10% 7% 6% 5% 3 4 5% 25%	3480
	21st to end	Day	28% 10% 4 9% 5% 4 4 3 5% 6% 22%	3816
April	1st to 10th	Day	20% 14% 4 7% 5% 4 4 4 5% 6% 28%	2220
	11th to 20th	Day	19% 9% 3 6% 4 4 4 3 6% 6% 35%	2442
	21st to end	Day	23% 9% 4 7% 4 4 3 3 5% 5% 34%	2470
May	1st to 10th	Day	18% 11% 3 8% 5% 5% 5% 4 5% 7% 30%	4106
	11th to 20th	Day	17% 9% 3 7% 5% 5% 5% 4 5% 8% 34%	4334
	21st to end	Day	16% 8% 3 7% 5% 5% 6% 4 6% 8% 32%	4954
June	1st to 10th	Day	23% 9% 3 8% 5% 5% 5% 4 4 7% 29%	2850
	11th to 20th	Day	21% 7% 3 6% 5% 4 4 4 5% 7% 35%	2850
	21st to end	Day	24% 9% 3 6% 5% 5% 5% 4 5% 7% 28%	2850
July	1st to 10th	Day	15% 6% 2 7% 5% 6% 6% 5% 7% 8% 32%	4760
	11th to 20th	Day	18% 7% 3 6% 4 4 5% 4 7% 8% 35%	4760
	21st to end	Day	15% 7% 3 6% 5% 5% 6% 5% 6% 7% 35%	4594
August	1st to 10th	Day	20% 8% 3 7% 5% 5% 5% 3 6% 7% 32%	4105
	11th to 20th	Day	14% 7% 3 8% 5% 5% 5% 4 7% 9% 32%	4045
	21st to end	Day	13% 4 2 6% 4 4 5% 3 6% 8% 45%	4532
September	1st to 10th	Day	13% 4 2 5% 4 4 4 4 6% 8% 45%	2269
	11th to 20th	Day	16% 6% 2 5% 4 4 3 3 5% 5% 48%	2090
	21st to end	Day	17% 8% 2 6% 3 3 4 3 4 5% 44%	2090
October	1st to 10th	Day	16% 8% 3 7% 4 4 4 3 5% 8% 39%	1925
	11th to 20th	Day	19% 8% 2 7% 4 3 4 3 5% 6% 38%	1900
	21st to end	Day	21% 8% 3 8% 6% 5% 4 3 5% 6% 33%	1981
November	1st to 10th	Day	20% 9% 3 7% 4 5% 4 3 4 6% 36%	1678
	11th to 20th	Day	20% 9% 3 7% 4 5% 4 3 5% 7% 34%	1600
	21st to end	Day	21% 13% 4 8% 5% 4 3 3 4 4 30%	1600
December	1st to 10th	Day	20% 12% 3 7% 4 3 4 3 6% 7% 32%	2610
	11th to 20th	Day	21% 11% 3 9% 5% 3 3 2 4 4 35%	2622
	21st to end	Day	17% 13% 4 8% 4 3 4 3 5% 4 34%	3476
January	1st to 10th	Night	13% 12% 4 9% 5% 3 4 4 6% 7% 33%	4898
	11th to 20th	Night	16% 11% 4 10% 6% 5% 4 3 5% 6% 30%	4665
	21st to end	Night	13% 14% 4 8% 5% 4 4 4 6% 8% 31%	4639
February	1st to 10th	Night	15% 13% 3 7% 5% 4 4 4 5% 7% 32%	2470
	11th to 20th	Night	16% 12% 4 9% 6% 5% 4 4 6% 6% 29%	2403
	21st to end	Night	15% 12% 4 7% 5% 5% 4 4 5% 4 34%	1940
March	1st to 10th	Night	22% 16% 4 7% 4 5% 5% 3 4 4 27%	3538
	11th to 20th	Night	20% 14% 5% 10% 6% 5% 5% 4 5% 5% 22%	3479
	21st to end	Night	30% 11% 3 8% 4 3 4 3 5% 4 26%	3816
April	1st to 10th	Night	23% 13% 3 7% 5% 4 4 4 4 5% 28%	1954
	11th to 20th	Night	23% 9% 2 7% 4 4 4 3 5% 6% 33%	1688
	21st to end	Night	24% 10% 2 7% 4 4 4 3 5% 5% 31%	1710
May	1st to 10th	Night	20% 9% 3 8% 5% 4 4 4 6% 7% 30%	2834
	11th to 20th	Night	19% 8% 3 6% 4 5% 5% 4 5% 7% 35%	2568
	21st to end	Night	15% 8% 4 7% 5% 5% 4 4 6% 9% 32%	2659
June	1st to 10th	Night	25% 8% 4 7% 4 4 4 4 5% 7% 28%	1330
	11th to 20th	Night	19% 8% 2 7% 4 5% 4 3 5% 6% 36%	1330
	21st to end	Night	26% 8% 2 6% 5% 5% 4 5% 4 6% 30%	1330
July	1st to 10th	Night	15% 6% 3 8% 5% 6% 5% 4 7% 8% 33%	2210
	11th to 20th	Night	20% 6% 3 6% 5% 5% 5% 4 5% 9% 31%	2210
	21st to end	Night	16% 6% 2 8% 5% 4 5% 4 6% 7% 36%	2922
August	1st to 10th	Night	18% 8% 3 9% 5% 5% 5% 4 6% 8% 29%	2825
	11th to 20th	Night	12% 7% 3 8% 5% 5% 5% 4 7% 9% 34%	2782
	21st to end	Night	14% 4 2 5% 4 4 4 4 6% 7% 46%	3124
September	1st to 10th	Night	16% 6% 2 5% 4 4 4 4 5% 7% 43%	1908
	11th to 20th	Night	16% 7% 2 5% 3 3 3 3 4 8% 46%	2090
	21st to end	Night	18% 6% 2 5% 3 4 4 3 5% 6% 43%	2090
October	1st to 10th	Night	18% 7% 3 6% 4 4 3 3 5% 7% 40%	2254
	11th to 20th	Night	17% 8% 3 7% 4 5% 4 3 5% 6% 38%	2280
	21st to end	Night	22% 9% 3 6% 5% 3 4 3 5% 6% 33%	2613
November	1st to 10th	Night	21% 8% 2 7% 4 4 4 3 5% 6% 36%	2618
	11th to 20th	Night	19% 10% 4 7% 5% 4 4 3 5% 6% 33%	2800
	21st to end	Night	22% 12% 4 7% 4 4 3 3 5% 6% 30%	2800
December	1st to 10th	Night	17% 11% 4 8% 5% 4 4 3 5% 6% 32%	4580
	11th to 20th	Night	22% 11% 3 6% 4 4 3 3 4 4 36%	5584
	21st to end	Night	20% 14% 4 9% 4 3 3 3 4 5% 30%	7502

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	55% 4 17% 16% 8%	2278
	11th to 20th	Day	52% 4 9% 22% 11% 1	2514
	21st to end	Day	46% 8% 13% 18% 14% 1	3039
February	1st to 10th	Day	52% 6% 12% 19% 10% 2	1710
	11th to 20th	Day	54% 7% 11% 17% 11% 1	1671
	21st to end	Day	48% 5% 11% 23% 10% 3	1513
March	1st to 10th	Day	59% 4 9% 17% 7% 4	3306
	11th to 20th	Day	61% 6% 10% 13% 8% 2	3480
	21st to end	Day	63% 3 6% 16% 9% 2	3816
April	1st to 10th	Day	57% 5% 9% 15% 12% 3	2220
	11th to 20th	Day	50% 5% 10% 21% 13% 1	2442
	21st to end	Day	53% 4 9% 16% 13% 5%	2470
May	1st to 10th	Day	53% 7% 10% 21% 8% 1	4120
	11th to 20th	Day	48% 7% 14% 22% 8% 1	4338
	21st to end	Day	47% 9% 12% 18% 13%	4954
June	1st to 10th	Day	56% 6% 11% 17% 10%	2850
	11th to 20th	Day	48% 5% 12% 21% 12% 2	2850
	21st to end	Day	55% 7% 11% 16% 10% 1	2850
July	1st to 10th	Day	46% 8% 15% 20% 11%	4685
	11th to 20th	Day	46% 7% 14% 23% 9%	4679
	21st to end	Day	45% 8% 14% 25% 8% 1	4447
August	1st to 10th	Day	51% 7% 12% 24% 7%	4092
	11th to 20th	Day	46% 8% 14% 24% 8%	4084
	21st to end	Day	36% 6% 14% 26% 16%	4532
September	1st to 10th	Day	36% 8% 14% 28% 14%	2269
	11th to 20th	Day	38% 6% 10% 27% 16% 2	2090
	21st to end	Day	41% 5% 10% 27% 16% 1	2090
October	1st to 10th	Day	46% 5% 11% 28% 9%	3198
	11th to 20th	Day	45% 4 12% 31% 8%	3140
	21st to end	Day	39% 5% 16% 23% 17%	3244
November	1st to 10th	Day	50% 4 11% 22% 11% 1	1678
	11th to 20th	Day	50% 5% 14% 16% 14% 1	1600
	21st to end	Day	58% 5% 13% 18% 6%	1600
December	1st to 10th	Day	53% 3 18% 19% 7%	2610
	11th to 20th	Day	55% 4 8% 19% 10% 4	2622
	21st to end	Day	53% 3 12% 16% 12% 2	3476
January	1st to 10th	Night	50% 6% 14% 23% 7% 1	4898
	11th to 20th	Night	54% 6% 11% 21% 8% 1	4665
	21st to end	Night	50% 6% 11% 22% 10% 1	4639
February	1st to 10th	Night	52% 5% 13% 17% 12% 1	2470
	11th to 20th	Night	54% 6% 11% 16% 11% 2	2406
	21st to end	Night	52% 4 10% 20% 11% 3	1940
March	1st to 10th	Night	62% 4 7% 16% 9% 2	3547
	11th to 20th	Night	61% 7% 10% 13% 8% 1	3480
	21st to end	Night	62% 3 6% 16% 10% 2	3816
April	1st to 10th	Night	58% 4 8% 15% 12% 4	1954
	11th to 20th	Night	51% 4 10% 19% 15% 1	1688
	21st to end	Night	54% 5% 9% 16% 14% 2	1710
May	1st to 10th	Night	52% 7% 13% 19% 8% 1	2840
	11th to 20th	Night	47% 7% 14% 23% 8% 1	2569
	21st to end	Night	46% 11% 15% 20% 8% 1	2660
June	1st to 10th	Night	54% 8% 10% 18% 8% 1	1330
	11th to 20th	Night	48% 6% 13% 22% 10% 2	1330
	21st to end	Night	56% 6% 11% 17% 8% 1	1330
July	1st to 10th	Night	46% 7% 15% 21% 11%	2175
	11th to 20th	Night	50% 7% 14% 23% 7%	2168
	21st to end	Night	46% 8% 11% 25% 9% 1	2830
August	1st to 10th	Night	53% 9% 12% 20% 7%	2813
	11th to 20th	Night	44% 8% 17% 24% 7%	2809
	21st to end	Night	36% 6% 16% 24% 15% 3	3124
September	1st to 10th	Night	39% 6% 12% 29% 13% 1	1908
	11th to 20th	Night	38% 6% 13% 27% 15% 1	2090
	21st to end	Night	42% 5% 9% 28% 15% 1	2090
October	1st to 10th	Night	48% 5% 11% 24% 11%	3761
	11th to 20th	Night	41% 5% 11% 29% 14%	3779
	21st to end	Night	44% 4 15% 23% 14%	4300
November	1st to 10th	Night	49% 5% 13% 22% 10% 1	2618
	11th to 20th	Night	51% 6% 12% 19% 11% 1	2800
	21st to end	Night	55% 7% 13% 16% 8%	2800
December	1st to 10th	Night	52% 4 12% 24% 8%	4580
	11th to 20th	Night	52% 3 10% 20% 13% 1	5585
	21st to end	Night	57% 4 9% 18% 9% 3	7502

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	29% 19% 36% 15% 2	200
	11th to 20th	Day	36% 19% 30% 12% 4 1	200
	21st to end	Day	23% 18% 36% 16% 6% 1	355
February	1st to 10th	Day	31% 15% 33% 16% 5% 1	370
	11th to 20th	Day	26% 25% 32% 13% 2 1	366
	21st to end	Day	26% 23% 31% 17% 3	355
March	1st to 10th	Day	30% 22% 30% 14% 3	460
	11th to 20th	Day	28% 21% 29% 17% 4 1	460
	21st to end	Day	34% 21% 26% 13% 4 1	506
April	1st to 10th	Day	36% 26% 22% 12% 3 1	460
	11th to 20th	Day	31% 22% 29% 12% 5% 1	452
	21st to end	Day	32% 19% 28% 13% 6% 1	460
May	1st to 10th	Day	33% 18% 27% 16% 5% 1	463
	11th to 20th	Day	27% 16% 29% 20% 8% 1	636
	21st to end	Day	24% 16% 36% 16% 6% 1	735
June	1st to 10th	Day	29% 18% 28% 19% 6% 1	680
	11th to 20th	Day	28% 12% 30% 21% 8% 1	680
	21st to end	Day	28% 11% 31% 23% 6% 1	680
July	1st to 10th	Day	22% 10% 37% 21% 10%	670
	11th to 20th	Day	20% 8% 34% 26% 10% 2	668
	21st to end	Day	17% 7% 36% 29% 9% 1	551
August	1st to 10th	Day	17% 9% 38% 25% 9% 2	486
	11th to 20th	Day	19% 9% 30% 28% 11% 3	479
	21st to end	Day	18% 12% 27% 26% 13% 4	539
September	1st to 10th	Day	12% 14% 33% 28% 9% 3	490
	11th to 20th	Day	22% 12% 26% 23% 13% 3	490
	21st to end	Day	20% 15% 32% 18% 10% 4	490
October	1st to 10th	Day	24% 14% 22% 25% 14% 2	403
	11th to 20th	Day	22% 21% 27% 19% 9% 1	390
	21st to end	Day	27% 18% 35% 15% 5%	429
November	1st to 10th	Day	31% 15% 32% 15% 6% 1	395
	11th to 20th	Day	34% 19% 26% 15% 5% 1	400
	21st to end	Day	31% 24% 29% 14% 3	400
December	1st to 10th	Day	34% 16% 32% 16% 3	400
	11th to 20th	Day	37% 24% 27% 10% 2	204
	21st to end	Day	30% 22% 29% 15% 3	220
January	1st to 10th	Night	27% 19% 30% 20% 3	900
	11th to 20th	Night	27% 17% 28% 22% 5%	823
	21st to end	Night	18% 21% 34% 23% 5%	841
February	1st to 10th	Night	25% 20% 29% 22% 4	760
	11th to 20th	Night	24% 24% 31% 17% 3	743
	21st to end	Night	23% 20% 31% 22% 4	628
March	1st to 10th	Night	26% 16% 34% 21% 2	760
	11th to 20th	Night	25% 18% 32% 20% 5% 1	760
	21st to end	Night	27% 16% 34% 19% 5%	836
April	1st to 10th	Night	32% 17% 30% 18% 2	661
	11th to 20th	Night	28% 16% 34% 17% 5%	564
	21st to end	Night	29% 16% 31% 19% 5%	570
May	1st to 10th	Night	27% 15% 32% 21% 5% 1	570
	11th to 20th	Night	28% 14% 33% 20% 5%	562
	21st to end	Night	19% 19% 37% 22% 4	565
June	1st to 10th	Night	27% 9% 35% 25% 3	380
	11th to 20th	Night	22% 12% 32% 27% 7%	380
	21st to end	Night	31% 6% 29% 29% 4 1	380
July	1st to 10th	Night	19% 6% 39% 30% 6%	370
	11th to 20th	Night	20% 6% 29% 36% 9%	368
	21st to end	Night	21% 7% 32% 32% 8%	545
August	1st to 10th	Night	17% 6% 35% 32% 10% 1	568
	11th to 20th	Night	18% 7% 29% 35% 11%	562
	21st to end	Night	15% 8% 31% 31% 14% 1	627
September	1st to 10th	Night	17% 9% 39% 24% 10% 1	583
	11th to 20th	Night	21% 9% 25% 30% 14% 1	760
	21st to end	Night	22% 12% 29% 27% 10%	760
October	1st to 10th	Night	22% 11% 30% 27% 10% 1	760
	11th to 20th	Night	22% 13% 34% 23% 8% 1	760
	21st to end	Night	28% 19% 32% 17% 4	836
November	1st to 10th	Night	29% 14% 31% 20% 5%	821
	11th to 20th	Night	28% 18% 30% 18% 6%	900
	21st to end	Night	30% 20% 29% 18% 3	900
December	1st to 10th	Night	32% 16% 30% 17% 4	900
	11th to 20th	Night	30% 21% 30% 16% 2	900
	21st to end	Night	30% 19% 28% 18% 4 1	990

Page generated at 2025-01-19 04:06:46. Version ac07

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